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Been having fun messing with antennas with the help of Tony G0BZB. We have both been trying out different setups and comparing notes using our results on WSPR. I have a 132' Windom fed to where my

Paul, Don and co Note that a heatsink doesn't prevent drift. It just slows it down... To get the U2 on frequency requires adjustment of the configuration setting for the 125MHz oscillator, and to

John, Andy The crystal is from Rapid Electronics in Colchester, UK. It's this one: http://www.rapidonline.com/Electronic-Components/20-00mhz-Hc-49-s-Crystal-20ppm-90-3259 . There is a datasheet there

Hi Andy Yes, it does appear from all reports that v2.03 is perfect. ALMOST perfect. A very few wishes include shifting that residual 25-30dB down on-frequency signal between frames. I'll get to it...

Hi Don, Four of the main causes for drift are heat, power supply voltage change and crystal aging. 1) Heat generated by chips can play havoc on crystals and cause them to drift up or down more so than

Paul and others, You know, I think a newbie like me can easily take points out of context. I do remember seeing somewhere, probably not here, WSPR is the one mode a GPS module is "very important".

Thanks Hans - I couldnt see anything wrong but for a while I thought I had a X connections somewhere - but when the serial and 1 pps lines into the AVR are single points I came to the same

Hi Hans, Yes I had a sneaky suspicion something might have changed in 2.03. In the back of my mind seemed to suggest that in 2.02 it got shifted, but I blew my 2.02 chip up with a little accident I

Make sure you get the correct heater for the job as these xtal specs are unknown and too much or too little heat will make it worse. Perhaps Hans can tell you the source and you can get the correct

Hi John, Yes the kit already sits in a nice polystyrene box but in the shack (garden shed) the temperature swing can be massive during a sunny day so even the polystyrene box isn't enough for

Its a lot cheaper to simply place a styrofoam sock over the crystal which will keep it nice and cosy. 73 John ? Digitally signed mail - M0ELS ________________________________ To:

Just installed V2.03 and can report that this is the most stable version so far. I have soak tested it with the trimble gps unit on 28mhz and can confirm that on fskcw mode my U2 drifted only a couple

I am on holiday up in the state of Washington and my WSPR beacon is running on 80 meters with 1 watt to a dipole up in the trees. I have been copied over 100 times overnight. I really don't think

Hi Laurence Does everything work fine when the unit is properly powered up? I noticed the same effect too. I don't think it is anything much to worry about. Modern LED's emit a small amount of light

Thanks Hans. Mystery solved.

Hi Andy, John There was a request to keep the output on frequency and the TX going, in FSK/CW mode in between frames, except during the 13 seconds calibration, so that the temperature would be more

Hi Don WSPR works fine without GPS. You won't get more spots with GPS or without it. GPS will calibrate your transmission frequency, and it also will keep your realtime clock accurate. Without GPS,

Aha - did that feature get dropped in order to meet the GPS calibration procedures ? 73 de Andy

Hmmm, I'd normally expect a decent bench PSU not to create the problem you've described. But at unless there's a problem with the PA stage then it does usually point to the PSU. You'll need about

Hi andy thanks for the reply. PSU at the moment is a bench supply. When the kit is boxed up it will have its own 5v supply. As you said on your last reply it is the DDS carrier that i'm seeing