Homebrew USB port powered 30 metre WSPR transmitter

[peterbmarks]

The WSPR2 documentation says "Be sure that your computer clock is correct to within about ±1 second". I guess if you sync before going out into the field you'd be ok for some hours but it probably wouldn't do for a camping trip with temperature fluctuations.

[vk3ye]

@peterbmarks Thanks Peter. One of the disadvantages of WSPR - but with such low power something's got to give.

[vk2tpm]

Great stuff Peter. Nice video production too! One reason for the lack of spots might have been clock drift - I wish there was a version of wspr that wasn't as critical of accurate time.

[vk3ye]

@vk2tpm Peter - I'd be curious how much clock drift affects things. I remember reading somewhere that 5 sec out was the limit, but surely drift can't be that much. Especially as I synchronise the computer's time before leaving home, so there's not too much time to drift.

[vk2ig]

Hi Peter, very impressive given your portable set-up and power from USB port of the laptop computer. My XYL and I liked your analogy of checking the WSPR spotting page with opening the chook shed door to see if there are any eggs - the latter is part of our daily routine here. :-) Cheers, Mike VK2IG/QRP