## Sunday, March 27, 2011

I know that on 30 metres, the dial frequency of 10.1387 plus
1300 Hz is the bottom of the QRSS band and plus 1400 Hz is the bottom of the WSPR
band.  Is this true on all bands?

Here are the WSPR dial frequencies(USB) for everything below
60 MHz (limit of the DDS-60) according to http://www.wsprnet.org.

// WSPR standard frequencies
// Shown are the dial frequencies plus 1500 Hz to put in the
// middle of the 200 Hz WSPR band

long rgWSPRFreq[] =
{
502400 + 1500,    // 500 KHz
1836600 + 1500,    // 160 meters
3592600 + 1500,    //  80 meters
5287200 + 1500,    //  60 meters
7038600 + 1500,    //  40 meters
10138700 + 1500,    //  30 meters
14095600 + 1500,    //  20 meters
18104600 + 1500,    //  17 meters
21094600 + 1500,    //  15 meters
24924600 + 1500,    //  12 meters
28124600 + 1500,    //  10 meters
50293000 + 1500     //   6 meters
};

enum
{
WSPR500KHZ, WSPR160M, WSPR80M, WSPR60M,
WSPR40M, WSPR30M, WSPR20M, WSPR17M,
WSPR15M, WSPR12M, WSPR10M, WSPR6M
};

So, as I have defined them, I can set the DDS frequency to
the centre of the WSPR band with the array above.  Are these WSPR/QRSS
band relationships consistent across all these bands as they are on 30M ?

I see from the KnightQRSS blog that there appears to be a more scattered set of standard frequencies, though I am not certain I understand the decision making process and therefore don't have much confidence in this list:

* 137.6 - 137.8 kHz
* 1.8432
* 3.500, 3.575, 3.579, 3.5999
* 7.000, 7.0402, 7.0599
* 10.140
* 14.000, 14.0989, 14.31818
* 18.1089
* 21.000, 21.1489
* 24.9289
* 28.000, 28.188, 28.322
* 50.294,400-600

On a side note, the 60 metre WSPR frequency surprises me as I thought only USB transmissions are available on 60 metres.  Granted, most people typically inject tones into their SSB transceiver to transmit WSPR.  What you get out when you do that however is FSK, so I am not so certain WSPR on 60 metres makes sense.  What did I miss?

On a similar note, it is a bit "funny" to note the number of times I hear computer annunciation beeps and even an occasional VOIP phone call or MP3 tracks that makes its way into the SSB transceiver MIC input when in digital modes in "non-voice" portions of the ham bands, especially 30 metres...