I finished putting together G0UPL’s QRSS beacon transmitter today and it seems to be working fine. Tomorrow I’ll have to dig up a 6V wall wart to power it but for now am using 4 AAA batteries just to make sure it’s putting out a signal with my callsign embedded.
With those batteries, it puts out a maximum of 150 mW which I’ll back down to 100 mW once I start putting it on the air. Initial tests show it doing what it’s supposed to do based on the display presented by antenna-less K3 feeding its received audio into Argo. Freq measurement of 10.140.048 is read with my MFJ-259 – not sure how much faith I should put into that gadget as a freq counter. Probably not much but we’ll see.
It’s not housed yet but will be going into a clear-top tin from the 4S-QRP Group (which has been looking for a worthy tenant).
Well that didn’t take long & it appears the freq counter function of the MFJ is quite accurate after all. Here’s my presentation at 0130Z as received by W4HBK in Pensacola FL. I’m not sure why the key down representation is inverted (above) as received here at my QTH but not when received elsewhere:
With a solid presence at 100 mW, I dialed the power down to 40 mW. Not sure if the shift upward in freq is due to me making the adjustment or the fact that less internal heat is generated within the transmitter’s components at the lower power. I suspect the latter since the drift occurs slowly over several minutes:
BTW, this is QRSS6 (6-second dots).
The next morning as received by KL1X/5: