Showing posts with label Australia. Show all posts
Showing posts with label Australia. Show all posts

Wednesday, 27 April 2022

More WSPR on 40 metres

A short break from work gave me some time for more experiments using WSPR over the Easter holidays from my WFH desk with a Raspberry Pi and Yaesu FT-817.

I first tried using a Clansman E-VHF sleeve dipole which happens to work rather badly on 30m and 17m and then with a Maldol 40m mobile whip operating at ground level in the garden.


Despite the simple setup, I managed to be heard in Australia, New Zealand the Falkland Islands.  I've also learned the trick (from a DL) of calling CQ on CW on the same dial frequency which makes you audible at +700Hz whilst remaining outside of the WSPR audio pass-band at +1.5kHz.



Friday, 26 June 2020

Australia on 2 Watts


Extremely happy - Running WSPR on a Raspberry Pi 4 driving an FT-817 with Yaesu  SCU-17 sound card interface, I have been heard in Australia! (Anyone else getting spurious decodes with a similar setup ?)


The  antenna is a MALDOL 40 metre band mobile whip mounted on a clothes dryer spike and a "Clansman" PRC counterpoise...


Although I reported 5 Watts (37 dBm) in the transmission, the AGC was backed off and I have since measured the output power with an RMS meter at just under 2 Watts.  I think it's time to build the QRP Labs Ultimate WSPR/QRSS kit or even a Raspberry Pi transmitter!