Relative Mintages of US Small Dollar Coins And The Odds Of Finding Them In Circulation


I was curious about the chances of finding various small dollar coins in circulation. I imported the mintage values for each year/mint/series into a spreadsheet, and created the following table.

For each coin, the mintage is shown, along with that mintage as a percentage of the total number of small dollar coins minted, which happens to be 5,222,246,560.

I then computed two other numbers for each coin:

Rank – A ranking of coins by most common (2000-P Sacagawea) to least common (2023-D Mississippi Innovation).

One Out of Every – Essentially the inverse of percentage. For example, for 2000-P Sacagawea it’s 7, which means that (roughly) 1 out of 7 coins are this. For the 1979-P Susan B. Anthony, 1/14. And so on. For clarity, values are rounded to the nearest integer. You could treat this, very crudely, as an estimate of how many coins you would need to search to find one of these.

Several caveats:

I do include the NIFC (Not Intended For Circulation) strikes. Those coins that, officially at least, were only sold to collectors. I suspect that in addition to some being dumped into circulation by individuals, the US Mint / Treasury release unsold NIFC coins into circulation. From my experience coin roll hunting, they do turn up much more often than I’d expect.

I do not include proofs. Yes, they turn up now and then, but only when someone releases one into circulation. For most years/series, 2 to 3 million proofs were minted. Fewer for recent years of Presidential and Native American coins, and far fewer for Innovation Dollars. They turn up in significantly smaller numbers than the NIFC strikes. I’m not sure it would be worth adding proofs to the table, as I think the suggested chances of finding them would be highly inflated.

Speaking of Innovation Dollars… their total mintage (to date) is 18,844,500, or 0.361% of all small dollars. If they were all in circulation (which they are not), the odds of finding one would be 1 in 277. From experience, my actual results are much worse than this. This suggests the odds for each member of the series in the table below is indeed inflated, as most never entered circulation.

The table is a mix of P and D mint coins. If you live between the two mints, perhaps you see nearly equal numbers of each. I live in MD, very close to the Philadelphia mint. Obviously, I see primarily P minted coins. D coins turn up, but in in much smaller numbers. Therefore I am much less likely to find D mint coins than the table suggests, and more likely to find P mint coins. The converse would be true for those in the western states.

Based on my penny coin roll hunting results, older D mint coins are much more likely to turn up here. This makes sense, the longer a coin is in circulation, the more time it has to work its way around the country. For the 1960s and back (wheat cents included) I tend to find roughly equal numbers of P and D cents, relative to their mintages. Fewer S mint pennies from 1968-1974, even taking into account their very low mintages, but that’s to be expected since they need to travel further.

OTOH, for recent years, D mint pennies are much less common here. They have not had enough time to work their way east. I assume this works the same way for those in the West, with respect to P mint coins.

Here’s a graph of my penny results. It’s somewhat convoluted based on how I set aside coins and count them, but I think you will get the idea:

Small dollar coins only date back to 1979, they’ve had less time to move around the country. Most of them have had very little time, this is reflected in how much more difficult they are for me to find.

To summarize:

For those coins where there were circulating business strikes, the table does an adequate job estimating how easy it is to find them, if you ignore the P/D mint issues (you live somewhere between the mints, and generally see a good mix of coins from both mints). Otherwise, you should keep in mind that it is going to be more difficult to find coins from the “other” mint than the table suggests.

For NIFC strikes, the table likely over-estimates your chances of finding coins, possibly significantly.

It might be best to treat the numbers in a relative, vs absolute, fashion.

After your done reading through this, head on over to my website Black Cat Systems and take a look at the software I write and sell. Maybe you will find something useful!


Year / Mint / Coin Mintage Percent One Out Of Every Rank
1979-P SBA 360,222,000 6.8978 14 3
1979-D SBA 288,015,744 5.5152 18 4
1979-S SBA 109,576,000 2.0983 48 9
1980-P SBA 27,610,000 0.5287 189 56
1980-D SBA 41,628,708 0.7971 125 34
1980-S SBA 20,422,000 0.3911 256 57
1981-P SBA 3,000,000 0.0574 1,741 108
1981-D SBA 3,250,000 0.0622 1,607 103
1981-S SBA 3,492,000 0.0669 1,495 99
1999-P 29,592,000 0.5667 176 54
1999-D SBA 11,776,000 0.2255 443 58
2000-P Sacagawea 767,140,000 14.6898 7 1
2000-D Sacagawea 518,916,000 9.9366 10 2
2001-P Sacagawea 62,468,000 1.1962 84 16
2001-D Sacagawea 70,939,500 1.3584 74 14
2002-P Sacagawea 3,865,610 0.074 1,351 91
2002-D Sacagawea 3,732,000 0.0715 1,399 95
2003-P Sacagawea 3,080,000 0.059 1,696 104
2003-D Sacagawea 3,080,000 0.059 1,696 105
2004-P Sacagawea 2,660,000 0.0509 1,963 114
2004-D Sacagawea 2,660,000 0.0509 1,963 115
2005-P Sacagawea 2,520,000 0.0483 2,072 116
2005-D Sacagawea 2,520,000 0.0483 2,072 117
2006-P Sacagawea 4,900,000 0.0938 1,066 73
2006-D Sacagawea 2,800,000 0.0536 1,865 109
2007-P Sacagawea 3,640,000 0.0697 1,435 97
2007-D Sacagawea 3,920,000 0.0751 1,332 87
2008-P Sacagawea 1,820,000 0.0349 2,869 120
2008-D Sacagawea 1,820,000 0.0349 2,869 121
2009-P Native American 39,200,000 0.7506 133 36
2009-D Native American 35,700,000 0.6836 146 51
2010-P Native American 32,060,000 0.6139 163 53
2010-D Native American 48,720,000 0.9329 107 26
2011-P Native American 29,400,000 0.563 178 55
2011-D Native American 48,160,000 0.9222 108 27
2012-P Native American 2,800,000 0.0536 1,865 110
2012-D Native American 3,080,000 0.059 1,696 106
2013-P Native American 1,820,000 0.0349 2,869 122
2013-D Native American 1,820,000 0.0349 2,869 123
2014-P Native American 3,080,000 0.059 1,696 107
2014-D Native American 2,800,000 0.0536 1,865 111
2015-P Native American 2,800,000 0.0536 1,865 112
2015-D Native American 2,240,000 0.0429 2,331 118
2016-P Native American 2,800,000 0.0536 1,865 113
2016-D Native American 2,100,000 0.0402 2,487 119
2017-P Native American 1,820,000 0.0349 2,869 124
2017-D Native American 1,540,000 0.0295 3,391 125
2018-P Native American 1,400,000 0.0268 3,730 128
2018-D Native American 1,400,000 0.0268 3,730 129
2019-P Native American 1,400,000 0.0268 3,730 130
2019-D Native American 1,540,000 0.0295 3,391 126
2020-P Native American 1,260,000 0.0241 4,145 132
2020-D Native American 1,260,000 0.0241 4,145 133
2021-P Native American 1,400,000 0.0268 3,730 131
2021-D Native American 1,260,000 0.0241 4,145 134
2022-P Native American 980,000 0.0188 5,329 138
2022-D Native American 980,000 0.0188 5,329 139
2023-P Native American 1,120,000 0.0214 4,663 136
2023-D Native American 1,120,000 0.0214 4,663 137
2007-P George Washington 176,680,000 3.3832 30 5
2007-D George Washington 163,680,000 3.1343 32 6
2007-P John Adams 112,420,000 2.1527 46 7
2007-D John Adams 112,140,000 2.1474 47 8
2007-P Thomas Jefferson 100,800,000 1.9302 52 11
2007-D Thomas Jefferson 102,810,000 1.9687 51 10
2007-P James Madison 84,560,000 1.6192 62 13
2007-D James Madison 87,780,000 1.6809 59 12
2008-P James Monroe 64,260,000 1.2305 81 15
2008-D James Monroe 60,230,000 1.1533 87 19
2008-P John Quincy Adams 57,540,000 1.1018 91 21
2008-D John Quincy Adams 57,720,000 1.1053 90 20
2008-P Andrew Jackson 61,180,000 1.1715 85 17
2008-D Andrew Jackson 61,070,000 1.1694 86 18
2008-P Martin Van Buren 51,520,000 0.9865 101 23
2008-D Martin Van Buren 50,960,000 0.9758 102 24
2009-P William Henry Harrison 43,260,000 0.8284 121 32
2009-D William Henry Harrison 55,160,000 1.0563 95 22
2009-P John Tyler 43,540,000 0.8337 120 30
2009-D John Tyler 43,540,000 0.8337 120 31
2009-P James K. Polk 46,620,000 0.8927 112 29
2009-D James K. Polk 41,720,000 0.7989 125 33
2009-P Zachary Taylor 41,580,000 0.7962 126 35
2009-D Zachary Taylor 36,680,000 0.7024 142 49
2010-P Millard Fillmore 37,520,000 0.7185 139 42
2010-D Millard Fillmore 36,960,000 0.7077 141 46
2010-P Franklin Pierce 38,220,000 0.7319 137 38
2010-D Franklin Pierce 38,360,000 0.7345 136 37
2010-P James Buchanan 36,820,000 0.7051 142 47
2010-D James Buchanan 36,540,000 0.6997 143 50
2010-P Abraham Lincoln 49,000,000 0.9383 107 25
2010-D Abraham Lincoln 48,020,000 0.9195 109 28
2011-P Andrew Johnson 35,560,000 0.6809 147 52
2011-D Andrew Johnson 37,100,000 0.7104 141 43
2011-P Ulysses S. Grant 38,080,000 0.7292 137 39
2011-D Ulysses S. Grant 37,940,000 0.7265 138 40
2011-P Rutherford B. Hayes 37,660,000 0.7211 139 41
2011-D Rutherford B. Hayes 36,820,000 0.7051 142 48
2011-P James Garfield 37,100,000 0.7104 141 44
2011-D James Garfield 37,100,000 0.7104 141 45
2012-P Chester Arthur 6,020,000 0.1153 867 64
2012-D Chester Arthur 4,060,000 0.0777 1,286 85
2012-P Grover Cleveland (1st Term) 5,460,000 0.1046 956 67
2012-D Grover Cleveland (1st Term) 4,060,000 0.0777 1,286 86
2012-P Benjamin Harrison 5,640,000 0.108 926 66
2012-D Benjamin Harrison 4,200,000 0.0804 1,243 83
2012-P Grover Cleveland (2nd Term) 10,680,000 0.2045 489 59
2012-D Grover Cleveland (2nd Term) 3,920,000 0.0751 1,332 88
2013-P William McKinley 4,760,000 0.0911 1,097 76
2013-D William McKinley 3,365,100 0.0644 1,552 100
2013-P Theodore Roosevelt 5,310,700 0.1017 983 70
2013-D Theodore Roosevelt 3,920,000 0.0751 1,332 89
2013-P William Howard Taft 4,760,000 0.0911 1,097 77
2013-D William Howard Taft 3,360,000 0.0643 1,554 101
2013-P Woodrow Wilson 4,620,000 0.0885 1,130 79
2013-D Woodrow Wilson 3,360,000 0.0643 1,554 102
2014-P Warren G. Harding 6,160,000 0.118 848 62
2014-D Warren G. Harding 3,780,000 0.0724 1,382 92
2014-P Calvin Coolidge 4,480,000 0.0858 1,166 80
2014-D Calvin Coolidge 3,780,000 0.0724 1,382 93
2014-P Herbert Hoover 4,480,000 0.0858 1,166 81
2014-D Herbert Hoover 3,780,000 0.0724 1,382 94
2014-P Franklin D. Roosevelt 4,760,000 0.0911 1,097 78
2014-D Franklin D. Roosevelt 3,920,000 0.0751 1,332 90
2015-P Harry S. Truman 4,900,000 0.0938 1,066 74
2015-D Harry S. Truman 3,500,000 0.067 1,492 98
2015-P Dwight D. Eisenhower 4,900,000 0.0938 1,066 75
2015-D Dwight D. Eisenhower 3,645,998 0.0698 1,432 96
2015-P John F. Kennedy 6,160,000 0.118 848 63
2015-D John F. Kennedy 5,180,000 0.0992 1,008 71
2015-P Lyndon B. Johnson 7,840,000 0.1501 666 60
2015-D Lyndon B. Johnson 4,200,000 0.0804 1,243 84
2016-P Richard M. Nixon 5,460,000 0.1046 956 68
2016-D Richard M. Nixon 4,340,000 0.0831 1,203 82
2016-P Gerald R. Ford 5,460,000 0.1046 956 69
2016-D Gerald R. Ford 5,040,000 0.0965 1,036 72
2016-P Ronald Reagan 7,140,000 0.1367 731 61
2016-D Ronald Reagan 5,880,000 0.1126 888 65
2020-P George H.W. Bush 1,242,275 0.0238 4,204 135
2020-D George H.W. Bush 1,502,425 0.0288 3,476 127
2018-P Introductory 502,150 0.0096 10,400 142
2018-D Introductory 582,825 0.0112 8,960 140
2019-P Delaware 472,750 0.0091 11,047 148
2019-D Delaware 479,975 0.0092 10,880 145
2019-P Pennsylvania 490,200 0.0094 10,653 144
2019-D Pennsylvania 443,800 0.0085 11,767 165
2019-P New Jersey 521,175 0.01 10,020 141
2019-D New Jersey 476,275 0.0091 10,965 146
2019-P Georgia 474,550 0.0091 11,005 147
2019-D Georgia 455,800 0.0087 11,457 150
2020-P Connecticut 436,000 0.0083 11,978 169
2020-D Connecticut 435,325 0.0083 11,996 171
2020-P Massachusetts 436,750 0.0084 11,957 167
2020-D Massachusetts 436,425 0.0084 11,966 168
2020-P Maryland 434,825 0.0083 12,010 172
2020-D Maryland 435,475 0.0083 11,992 170
2020-P South Carolina 432,850 0.0083 12,065 173
2020-D South Carolina 397,775 0.0076 13,129 178
2021-P New Hampshire 453,825 0.0087 11,507 153
2021-D New Hampshire 450,725 0.0086 11,586 162
2021-P Virginia 423,600 0.0081 12,328 174
2021-D Virginia 422,875 0.0081 12,349 175
2021-P New York 451,750 0.0087 11,560 160
2021-D New York 451,175 0.0086 11,575 161
2021-P North Carolina 405,950 0.0078 12,864 177
2021-D North Carolina 389,725 0.0075 13,400 179
2022-P Rhode Island 454,050 0.0087 11,501 152
2022-D Rhode Island 453,775 0.0087 11,508 154
2022-P Vermont 454,275 0.0087 11,496 151
2022-D Vermont 452,775 0.0087 11,534 155
2022-P Kentucky 451,900 0.0087 11,556 159
2022-D Kentucky 452,550 0.0087 11,540 156
2022-P Tennessee 452,325 0.0087 11,545 157
2022-D Tennessee 452,275 0.0087 11,547 158
2023-P Ohio 495,125 0.0095 10,547 143
2023-D Ohio 447,450 0.0086 11,671 163
2023-P Louisiana 444,625 0.0085 11,745 164
2023-D Louisiana 411,950 0.0079 12,677 176
2023-P Indiana 459,775 0.0088 11,358 149
2023-D Indiana 443,650 0.0085 11,771 166
2023-P Mississippi 371,000 0.0071 14,076 180
2023-D Mississippi 352,450 0.0067 14,817 181

Generating VGA video with Verilog

I’ve started work on an FPGA based Z80 computer. I wanted to generate the video in the FPGA as well, turns out VGA is fairly easy to generate. There’s numerous websites that describe the timing and parameters of the various VGA modes, and how VGA works.

This project is also my Verilog learning experience, so pardon any horrible code.

In a nutshell, for basic VGA you need a total of 5 digital output lines. One for horizontal sync, one for vertical, and one each for the red, green, and blue video signals. The RGB signals are actually analog, but for my purposes implemented as digital, either on or off. That allows a total of eight colors, including white and black. For now the text is only color. To produce additional colors, the RGB lines can be driven with a D/A converter, which could be as simple as a resistor ladder circuit.

These analog voltages need to be limited to under 1 volt. The FPGA I/O outputs are 3.3 volts so a simple resistor and diode circuit was used for each line. Here’s the circuit, as you can see it is quite simple. Virtually any reasonably fast diode can be used:

I decided to use the standard 640 x 480 60 Hz mode, as it would be more than adequate for my goal of displaying 25 lines of 80 characters.

Each character is displayed as a 8 by 16 pixel matrix, resulting in 640 x 400 pixels, the rest of the screen is not used.

The design was implemented on a RioRand EP2C5T144 Altera Cyclone II FPGA Mini Development Board available at Amazon for $19.99. What a deal.

I used the free version of Altera’s Quartus II software package.

Video memory is a 2K byte dual ported RAM, organized in a linear fashion, using 2000 bytes.

The character generator ROM is a 1K ROM, storing 8 rows of 8 pixels for each of the 128 ASCII characters. Each row is displayed twice, for a total of 16 rows. As of now the high bit of the stored ASCII value in video memory is not used, I plan on eventually using it to implement a low-res color graphics mode, a la the Apple ][.

The RioRand-EP2C5T144 FPGA dev board has a 50 MHz oscillator signal as a clock input. I implemented a 4x PLL to produce an internal 200 MHz clock. While the 50 MHz clock is adequate for 640×480 video, the faster clock will allow higher resolution video modes down the road.

A state machine is used to generate the video. A frame of video actually has 525 scan lines, it starts with 10 “front porch” lines (essentially all black video lines), then 2 lines of vertical sync, followed by 33 more “back porch” lines.
Front porch and back porch are old terms from the original NTSC analog TV system developed in the 1940s. You’ll see that totals 45 lines, leaving 480 lines of actual video.

Each video line has 800 pixels (as far as timing is concerned). There’s a front porch of 16 pixels, 96 pixels of horizontal sync, 48 pixels of a back porch, then 640 pixels of actual video content. At a 200 MHz clock, each pixel is 8 clock cycles.

Prior to the display of a pixel, the video RAM is read. The lower 7 bits of the byte, which is the ASCII value of the character to be displayed, is used along with 3 bits of the video line, to form a 10 bit address into the character generator.

Since each line of a character is displayed twice, bits [3:1[ and not [2:0] of the video line are used. If I was willing to dedicate 2K to the character ROM, I could display 16 rows of pixels for each character.

The resulting VGA video, the video RAM was pre-loaded with data using the Altera MegaWizard option to do so from an Intel Hex file.

Verilog Code:

module vga1

// these are placeholders for when we hook up a CPU later
reg [15:0] addressWriteVideoRam=16'b0;
reg [7:0] dataInWriteVideoRam;
wire [7:0] dataOutReadVideoRam;
reg writeEnableWriteVideoRam=1'b0;
reg writeVideoRamClock;

// VGA video generator, undocumented for now. Good luck. 
input clock_in; // 50 MHz input clock

// RGB outputs
output reg red;
output reg green;
output reg blue;

// horizontal and vertical sync outputs
output reg hsync;
output reg vsync;

wire pllClock;
pll my_pll (clock_in, pllClock); // 200 MHz clock from the 50 MHz board clock

reg	[9:0]  char_rom_address;
wire	[7:0]  char_rom_output;
reg char_rom_clock;
reg [7:0] char_rom_data_byte;

reg pixel;
reg [15:0] clockCounter; // 200 MHz clock
reg [15:0] pixelCounter; // 25 MHz pixel clock
reg video_inclock;	// video RAM clock
reg video_wren; // not used yet
reg [7:0] video_data; // not used yet

// 1K x 8 bit video character ROM, 8 lines of 8 pixels for 128 characters, high ASCII bit not used
char_rom my_char_rom(char_rom_address, char_rom_clock, char_rom_output);

// 2K video dual port RAM for 25 lines of 80 characters	
video_ram_dp the_video_ram(.address_a (video_display_address[10:0]), .data_a(video_data), .clock_a(video_inclock), .wren_a(video_wren), .q_a(video_data_byte) ,
	.address_b(addressWriteVideoRam[10:0]), .data_b(dataInWriteVideoRam), .clock_b(writeVideoRamClock), .wren_b(writeEnableWriteVideoRam), .q_b(dataOutReadVideoRam)  );

reg [15:0] video_display_address;
wire [7:0] video_data_byte;

reg [15:0] horzCounter=16'd0;
reg [15:0] lineCounter=16'd0;

// VGA640x480x60_200mhz clock
parameter pixel_rate=8;
parameter horz_front_porch=16*pixel_rate;  
parameter horz_sync=96*pixel_rate;  		
parameter horz_back_porch=48*pixel_rate;
parameter horz_line=800*pixel_rate;
parameter vert_front_porch=10;
parameter vert_sync=2;
parameter vert_back_porch=33;
parameter vert_frame=525;
parameter horz_sync_polarity = 1'b0;
parameter vert_sync_polarity = 1'b0;
parameter first_video_line=49; // first line of video
parameter number_of_video_lines=400; // 25 ASCII lines of 16 pixels each is 400 video lines

always @(negedge pllClock)
always @(posedge pllClock)

	if (clockCounter[2:0]==7) pixelCounter<=pixelCounter+1'b1;

	if (pixelCounter[2:0]==7) begin
		case (clockCounter[2:0])
//		0 : not used
//		1 : not used
		3 : char_rom_address<={video_data_byte[6:0],lineCounter[3:1]}; // high 7 bits of charactor ROM address is the ASCII character, low 3 bits video line counter, we display each line twice
		4 : char_rom_data_byte<=char_rom_output; // latch the character ROM data
//		5 : not used
		6 : video_inclock<=0;	// clock video for next ASCII character
		7 : video_inclock<=1;
	if (horzCounter==0)	begin  // set video to black
	if (horzCounter==horz_front_porch)	hsync<=horz_sync_polarity;
	if (horzCounter==(horz_front_porch+horz_sync))	hsync<=!horz_sync_polarity;

	if ( (lineCounter>=(vert_front_porch+vert_sync+vert_back_porch+first_video_line)) && (lineCounter<=(vert_front_porch+vert_sync+vert_back_porch+first_video_line+number_of_video_lines)) )  begin // video frame time

		if ((pixelCounter[2:0]==6) && (clockCounter[2:0]==7)) video_display_address<=video_display_address+1'b1;

		if (horzCounter==(horz_front_porch+horz_sync+horz_back_porch))	begin
			pixelCounter<=0; // start of video line
		if (horzCounter>=(horz_front_porch+horz_sync+horz_back_porch))	begin // video line
			case (pixelCounter[2:0])
			0 : pixel=char_rom_data_byte[0];
			1 : pixel=char_rom_data_byte[1];
			2 : pixel=char_rom_data_byte[2];
			3 : pixel=char_rom_data_byte[3];
			4 : pixel=char_rom_data_byte[4];
			5 : pixel=char_rom_data_byte[5];
			6 : pixel=char_rom_data_byte[6];
			7 : pixel=char_rom_data_byte[7];
			// set RGB outputs
			end  // video line time
	end // video frame time

	horzCounter <= horzCounter + 16'd1;
	if (horzCounter==horz_line) begin // end of scan line, set video to black

		if (lineCounter>=(vert_front_porch+vert_sync+vert_back_porch)) begin // video frame time
			if (lineCounter[3:0]!=4'd15) video_display_address<=video_display_address-8'd100; else video_display_address<=video_display_address-8'd20;  // 80 chars back to beginning of line
		if (lineCounter==vert_front_porch) vsync<=vert_sync_polarity;
		if (lineCounter==(vert_front_porch+vert_sync)) vsync<=!vert_sync_polarity;
		if (lineCounter==vert_frame) begin	// end of the video frame, start over
			video_display_address<=466;		// offset so we start reading video data at the correct address


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Deleting cookies will have a negative impact on the usability of many websites.

Those Wacky Pescadores

Pescadore is the term used by Pirate DXers to refer to a fishermen operating on the 43 meter band, the plural is pescadores, often abbreviated as peskies. While they can turn up anywhere on the band (or outside it), 6925 LSB seems to be the most common frequency, which can cause QRM to pirates operating on 6925 AM. They also turn up on 6933 LSB fairly often.

Usually you hear them chatting with each other; informal QSOs. Sometimes however they have been known to play music, or engage in other activities fairly close to broadcasting. They can actually be entertaining to listen to.

Here is a recording of them from the other night, starting just before 0000 UTC on 21 September, 2016.

Pescadores have even inspired a pirate radio station named Pesky Party Radio, most recently heard last month. This station plays Spanish language covers of popular songs, and is rather hilarious.

Running an RTL SDR USB Dongle On Your Mac The Easy Way With Cocoa RTL Server

I’ve had a few of the RTL radio tuner dongles for a while. These are USB devices that were originally made for use as TV tuners overseas, but it turns out that you can access the I/Q data stream, and turn them into an SDR (Software Defined Radio). They can be tuned roughly over a range of 25 to 1700 MHz, and sometimes even higher, depending on the tuner IC chip inside the particular dongle.

I previously posted about how to get the RTL dongle working on the Mac here: An SDR for $17 – The R820T USB RTL-SDR DVB-T Dongle and here: An SDR for $17 – The R820T USB RTL-SDR DVB-T Dongle – Part 2. These posts were from 2013, and I did the installation on a Mac running OS X 10.6, using some pre-built libraries.

Fast forward to the present day. I got a new Mac running OS X 10.11 El Capitan, and I wanted to be able to use the RTL dongles with my favorite SDR software on the Mac, SdrDx. Enter Cocoa RTL Server.

Cocoa RTL Server is a stand alone app that interfaces with an RTL dongle. It does not require you to build or install any drivers or libraries. It just works. It’s based off of an open source app called SoftShell, that I heavily extended. Cocoa RTL Server also acts like a networked SDR, following the RF Space protocol. That means it works with SdrDx, as well as any other SDR app on the Mac that supports RF Space SDRs like the netSDR. You can download a copy of the app from the Cocoa RTL Server page. Source code is included, however I am not offering any support for the project or final app.

Here’s a screenshot of the app running:

Getting up and running is easy:

1. Plug in your RTL device
2. Run CocoaRTLServer 2.0
3. Select the device from the popup menu (usually it is already selected)
4. Change the rtl_tcp or tx_tcp port values if needed
5. Click Open
6. Configure your SDR app (set the correct TCP port) and run it

I’ve run it under Mac OS X 10.6, 10.10 and 10.11, It should run under 10.7-10.9 as well. It only works with RTL devices with an E4000 or R820T tuner IC.

Using SdrDx, I can tune a large portion of the FM broadcast band, click to view full size:

In this case I am tuned to 97.9 MHz. To the left of the signal meter, you can see it has decoded the station ID from the RDS data. Yes, SdrDx decodes RDS.

If you look at the lower right corner, you see the scope display of the demodulated FM audio. There are markers for the portions of interest:
You can see the main audio above the green marker to the left.
The stereo pilot at 19 kHz (red marker).
The stereo subcarrier (aquamarine)
The RDS data (orange)
The 67 kHz SCA subcarrier (purple)
The 92 kHz SCA subcarrier (yellow)

Cocoa RTL Server also includes a server that emulates rtl_tcp, so it works with Cocoa1090 which decodes aircraft transponders that transmit on 1090 MHz. It should also work with any other app that gets data from rtl_tcp. Here’s a screenshot of Cocoa1090 running:

Receiving DGPS Stations with MultiMode For Mac OS X

MultiMode for Mac OS X can decode DGPS (Differential Global Positioning System) transmissions. DGPS stations transmit the difference between positions indicated by GPS satellite systems and the known fixed position of the station. This allows higher accuracy. DGPS transmissions are 100 or 200 baud and are transmitted on frequencies from 285 kHz to 325 kHz. They can be interesting DX targets.

A copy of MultiMode can be downloaded here:

To decode the transmission, tune your radio to a DGPS frequency. You can either tune directly to the frequency in CW mode, in which case you set the center frequency in MultiMode to that for your radio’s CW mode, or use USB mode, tune 1 kHz low, and set the center frequency to 1000 Hz.

You can listen to an example DGPS audio recording

Select the baud rate, either 100 or 200 baud, using the button. Also be sure to set your location so that the correct distance and bearing is calculated. Eventually, if you have tuned into a DGPS transmission that is strong enough, you will start seeing decode messages printed:

The Short Demod button can be toggled on, in which case MultiMode will look at a smaller part of the DGPS packet. This often allows decodes of weaker transmissions.

Note that since no error checking is performed on the packet, it is possible to get false decodes. To help determine if you are actually receiving the correct station, compare the printed frequency for that station to what your radio is tuned to, to verify they match. Also look for several decodes from the same station in a row, that indicates that you probably are really receiving that station.

Here’s a list of some stations I have received here with a modest 200 ft random wire antenna:

[15:44:47 11/19/15] 008 804 008 009 286.0 kHz Sandy Hook, NJ United States 40.4747 -74.0197 235.632 km 45.2895 deg
[19:27:49 11/19/15] 198 772 198 199 306.0 kHz Acushnet, MA United States 41.7492 -70.8886 529.571 km 53.1416 deg
[19:28:52 11/19/15] 190 782 190 191 305.0 kHz Dandridge, TN United States 36.0225 -83.3067 723.745 km 245.071 deg
[19:29:12 11/19/15] 156 863 156 157 311.0 kHz Rock Island IL United States 42.0203 -90.2311 1245.06 km 290.156 deg
[19:32:00 11/19/15] 012 806 012 013 289.0 kHz Driver, VA United States 36.9633 -76.5622 231.719 km 192.449 deg
[19:33:00 11/19/15] 184 788 184 185 291.0 kHz Hawk Run, PA United States 40.8889 -78.1889 280.839 km 319.079 deg
[19:33:24 11/19/15] 006 803 006 007 293.0 kHz Moriches, NY United States 40.7944 -72.7564 340.978 km 53.1725 deg
[19:33:37 11/19/15] 196 771 196 197 294.0 kHz New Bern, NC United States 35.1806 -77.0586 434.825 km 192.789 deg
[19:33:50 11/19/15] 092 843 092 093 295.0 kHz St Mary's, WV United States 39.4381 -81.1758 448.281 km 277.867 deg
[19:33:54 11/19/15] 136 792 136 137 297.0 kHz Bobo, MS United States 34.1253 -90.6964 1414.92 km 252.075 deg
[19:33:59 11/19/15] 058 847 058 059 301.0 kHz Annapolis, MD United States 39.0181 -76.61 52.734 km 272.373 deg
[19:36:40 11/19/15] 046 824 046 047 303.0 kHz Greensboro, NC United States 36.0694 -79.7381 463.251 km 226.48 deg
[19:40:01 11/19/15] 218 777 218 219 304.0 kHz Mequon, WI United States 43.2025 -88.0664 1110.64 km 298.697 deg
[19:41:11 11/19/15] 130 834 130 131 307.0 kHz Hagerstown, MD United States 39.5553 -77.7219 160.52 km 293.159 deg
[19:43:59 11/19/15] 312 929 312 313 296.0 kHz St Jean Richelieu, QC Canada 45.3244 -73.3172 736.38 km 16.5642 deg
[19:44:05 11/19/15] 154 862 154 155 322.0 kHz St Louis, MO United States 38.6189 -89.7644 1190.3 km 272.301 deg
[19:55:36 11/19/15] 112 836 112 113 292.0 kHz Cheboygan, MI United States 45.6556 -84.475 1013.8 km 319.521 deg
[20:32:19 11/19/15] 017 808 016 017 314.0 kHz Card Sound, FL United States 25.4417 -80.4525 1560.45 km 196.764 deg
[20:34:44 11/19/15] 340 942 340 341 288.0 kHz Cape Ray, NL Canada 47.6356 -59.2408 1650.3 km 49.1252 deg
[22:10:54 11/19/15] 168 869 168 169 290.0 kHz Louisville, KY United States 38.0175 -85.31 816.337 km 265.238 deg
[22:11:34 11/19/15] 192 778 192 193 292.0 kHz Kensington, SC United States 33.4906 -79.3494 681.801 km 207.126 deg
[22:20:26 11/19/15] 320 925 320 321 313.0 kHz Moise, QC Canada 50.2025 -66.1194 1464.05 km 28.7438 deg
[11:34:56 11/20/15] 262 881 262 263 302.0 kHz Point Loma, CA United States 32.6769 -117.25 3697.45 km 272.2 deg

Poor conditions for some on 43 meters last night, better for others

One measure of the strength of the ionosphere is called foF2. It is the maximum frequency that will be reflected straight back. That is imagine the radio transmitter and receiver are located near each other, the radio waves go straight up, and are reflected straight back down to the receiver. foF2 is continuously varying, based on solar activity, and what part of the Earth the Sun is over. You can find a real time map at this URL:

As the distance between the transmitter and receiver increases, the radio waves are not perpendicular to the ionosphere, but instead strike it at an angle. This allows frequencies higher than foF2 to be reflected. The angle that the radio waves strike the ionosphere depends on the distance between the transmitter and receiver, and the height of the ionosphere, which unfortunately also varies. This is called the hmF2, and there’s a real time map of it also:

The Maximum Usable Frequency (MUF) can be found by:
MUF = foF2 * sqrt( 1+ [D/(2*hmF2)]^2) where D is the distance in km.

Lately, foF2 has been reaching very low values once the Suns sets. This is what causes the 43 meter band to “go long”, making it difficult to impossible to hear stations even many hundreds of miles away. As an example, here is a plot of the measured foF2 value taken over Wallops Island, VA. Consider these values typical for much of the eastern US during this time period:

The blue trace is today’s foF2 values, red is yesterday’s, and the green trace is an average of the last five days.

foF2 was about 5 MHz at 2300z, dropping to 4.5 MHz by 0000z. This was evident in the loggings for The Crystal Ship. Many listeners who normally get a strong signal from this station had poor or no reception (as was my case). This was also the start of a geomagnetic storm, the K index at 0000z was 3, and has since risen to 5 as I type this.

The flip side of a low foF2 value is that listeners at a greater distance from a station can get stronger signals. The geomagnetic storm last night could also have actually enhanced reception for some listeners. Medium wave DXers have referred to geomagnetic storms as “stirring the gumbo”, bringing in a different mix of station than are normally heard.

Update – here is the link to the real time Wallops Island foF2 chart: and the current graph itself:

A Statistical Analysis of A Somewhat Subjective Rating of the Day’s Weather

Below is an analysis of the Capital Weather Gang’s “Daily Digit”, a number from 1 to 10 given each morning to the day’s expected weather. 574 days worth of Daily Digits were analyzed, from March 19, 2013 through October 13, 2014. The starting date was picked as that was the first date where it was easy to get a copy of the CWG’s archived web pages.

The mean daily digit was 6.32.

Below is a trend graph of the Daily Digit, smoothed slightly to make it more readable:

The slope upwards over time could be an artifact of the range of dates chosen, or it could be genuine Daily Digit Inflation.

Below is a histogram of the Daily Digit values:

There were only five days with a Daily Digit of 1; they were:

June 13, 2013 – David Streit (Severe weather)
December 9, 2013 – Jason Samenow (“Sloppy, cloudy and cold”)
December 29, 2013 – Brian Jackson (“40s and soaking rain in December”)
January 3, 2014 – A. Camden Walker (Icy from snow the night before)
January 28, 2014 – Matt Rogers (“Cruel cold slaps us in the face again”)

The mean Daily Digit per month of the year:

The mean Daily Digit per day of the week:

The mean Daily Digit per author:

There is a fairly regular rotation of authors, each generally writing on the same day, hence the strong correlation between the above two graphs. Each author had between 73 to 81 posts.

Not included in the above were the following two authors with a limited number of Daily Digits:
Kathryn Prociv: 10 entries with a mean of 8.3
Rick Grow: 8 entries with a mean of 5.0

There were also a few cases where two authors were credited the same day, also not included above:
Matt Rogers;Jason Samenow: 3 entries with a mean of 3.33
Brian Jackson;Dan Stillman: 2 entries: with a mean of 3.5
A. Camden Walker;Ian Livingston: 1 entry with a mean of 2 (January 10, 2014, Freezing Rain)
Dan Stillman;Ian Livingston: 1 entry with a mean of 4 (February 15, 2014, Snow)
Dan Stillman;Jason Samenow: 1 entry with a mean of 3 (February 26, 2014, “Mother Nature hits the repeat button with light morning snow”)

A big thanks to the Capital Weather Gang for their fabulous posts each day!


Here’s histograms for each author:

Winter 2013-2014 Snowfall

With March ending, I’m hoping we’re done with snow. Here are my measured snowfall totals for the season:

Sunday December 8, 2013: 7 inches snow, some freezing rain
Tuesday December 10, 2013: 6.25 inches snow
Saturday December 14, 2013: 2.5 inches snow
Tuesday December 17, 2013: 0.5 inches snow
Thursday December 26, 2013: 0.75 inches snow

December 2013 total: 17.00 inches snow

Thursday January 2, 2014: 6.00 inches snow
Friday January 10, 2014: 0.25 inches snow
Saturday January 18, 2014: 1.00 inches snow
Tuesday January 21, 2014: 8.00 inches snow
Wednesday January 29, 2014: 0.50 inches snow
Friday January 31, 2014 Graupel

January 2014 total: 15.75 inches snow

Monday February 3, 2014: 7.00 inches snow
Wednesday February 5, 2014: Ice Storm : 1/4 – 1/2 inch freezing rain, 1.00 inch snow / sleet
Sunday February 9, 2014: 1.75 inches snow
Thursday February 13, 2014: 16 inches of snow in the morning, 4 inches at night, 20 inches total
Saturday February 15, 2014: 0.5 inches snow
Monday February 17, 2014: 2.0 inches snow
Tuesday February 25, 2014: 0.25 inches snow
Wednesday February 26, 2014: 0.5 inches snow

February 2014 total: 33.00 inches snow

Monday March 3, 2014: 3.0 inches snow
Monday March 17, 2014: 3.75 inches snow
Tuesday March 25, 2014: 1.50 inches snow
Wednesday March 26, 2014: Dusting of snow
Sunday March 30, 2014: 4.0 inches of snow
March 2014 total: 12.25 inches snow

2014-2013 season total: 78.00 inches snow

Looking for some iPad/iPhone apps? Here are a few that I have written:

Pictures of some snowfall events:

January 31, 2014 Graupel:
January 31, 2014 Graupel

February 5, 2014 Ice Storm:
February 5, 2014 Ice Storm
February 5, 2014 Ice Storm

February 13, 2014 Snow storm, pictures taken on the 14th:
February 13, 2014 snowfall
February 13, 2014 snowfall

March 30, 2014 Surprise snow storm

Looking for some iPad/iPhone apps? Here are a few that I have written:

A Very Busy Christmas Weekend/Eve For Pirates

Here’s what folks have been hearing since Friday night. 41 different North American pirate radio transmissions so far, a total of 163 loggings, and it’s not even Christmas yet!

A big thank you to the operators for their shows, and the listeners for their reports.

All of these loggings can be viewed at the HF Underground

Pirate Radio Boston 6925 AM 1945 UTC December 24, 2012
WBNY 6240 AM 1604 UTC December 24, 2012
Eccentric Shortwave 6930 USB 1529 UTC December 24, 2012
Channel Z 6925 AM 1400 UTC December 24, 2012
UNID 6925 USB 1455 UTC December 24, 2012
Metro Radio International 6975 AM 1323 UTC December 24, 2012
Radio Ronin 6920 AM 1308 UTC December 24, 2012
Northwoods Radio 6925 USB 1200 UTC December 24, 2012
Channel Z 6925 AM 0427 UTC December 24, 2012
UNID 6955 AM 0212 UTC December 24, 2012
Rave On Radio 6925 USB 0200 UTC December 24, 2012
Radio GaGa 6925 USB 0140 UTC December 24, 2012
Radio Appalachia 6935 AM 0125 UTC December 24, 2012
Dit Dah Radio 6925 USB 0025 UTC December 24, 2012
Dit Dah Radio 6935 USB 2156 UTC December 23, 2012
WBNY 6913.34 AM 2150 UTC December 23, 2012
WKND 6924.6 AM 2148 UTC December 23, 2012
Metro Radio International 6925 AM 2008 UTC December 23, 2012
WEDG The Edge 1610 AM 1700 UTC December 23, 2012
Pirate Radio Boston 6925 AM 1612 UCT December 23, 2012
Pirate Radio Boston 6950 AM 1610 UTC December 23, 2012
Pirate Radio Boston 6925 AM 1805 UTC December 23, 2012
Channel Z 6925 AM 1346 UTC 23 December 23, 2012
1720 KHz “The Big Q” 0509 UTC December 23, 2012
Channel Z 6925 AM 0405 UTC December 23, 2012
WPOD 6925 USB 0130 UTC December 23, 2012
Wolverine Radio 6925 USB 0048 UTC December 23, 2012
Toynbee Radio 6925 AM 2258 UTC December 22, 2012
Monkey Mayan Memorial Radio 6925 AM 2222 UTCDecember 22, 2012
UNID 6950 USB 2218 UTC December 22, 2012
UNID 6924.7 Khz AM 2215 UTC December 22, 2012
Toynbee Radio 6925 AM 2131 UTC December 22, 2012
Pirate Radio Boston 6949.39 AM 2015 UTC December 22, 2012
UNID 6935 AM 1902 UTC December 22, 2012
Pirate Radio Boston 6949.39 AM 1355 UTC 2December 22, 2012
Rave On Radio 6925 USB 1241 UTC December 22, 2012
The Big Q 1720 & 1710 AM 0525 UTC December 22, 2012, 2208 UTC
Captain Morgan Shortwave 6950.7 AM 0240 UTC December 22, 2012
UNID 6925 AM 0225 UTC December 21, 2012
UNID 6924 AM 0203 also 6929 AM 0207 December 22, 2012
Insane Radio 6925 AM 0121 UTC December 22, 2012
Insane Radio SSTV 6925 AM 0021 UTC December 22, 2012