Svar till: SAQ transmission 24th December 2024

[rich.g.williams]

Hello Paul S.

Not for me to reply and most likely you have far more radio experience than I. That said I thought I would share my options on basis of our shared enthusiasm for SAQ.

I would be surprised if there was no signal to be received at your location, my fairly brief experiences receiving SAQ with a few different antenna types is that the very narrow band 17.2kHz signal seems to get everywhere, it’s just about how much noise is masking it. The best antenna type seems to be a very big loop in a vertical plane pointing to SAQ, it picks up the horizontal magnetic field. I set a very narrow band filter centered around 17.2kHz that is about 50Hz wide. I have also experimented with tuning the loop (parallel capacitor) to peak at 17.2kHz and the combination of analogue and digital filtering seems to help.

Then I shift the pitch down to typically 760 Hz to make SAQ audible.

Best wishes and Merry Christmas

Richard