Re: Radio "limbo"


Hi Bruce,

well, we sure have to believe the statements on power sent :-). I myself on TX am using the WSPRlight flexi and I checked the power with a spectrum analyser. The settings seem to be about correct. I did not correct for filter and koax or antenna gain.

On RX I am using a raspsdr in 4 channel mode for public websdr (see OE3XOE at  and a flydog-sdr with raspPi4 and wsprdaemon as a WSPR reporter on 12 bands. I am constantly about the no. 15 of the best reporters  worldwide.

If you only use a raspsdr on several bands for reporting WSPR you will not be able to decode all the signals. I now have my two most busy bands decoded on the raspsdr and 10 bands on the wsprdaemon.

73 de Gerhard OE3GBB


Am 05.10.2021 21:00, schrieb Bruce KX4AZ:

On Tue, Oct 5, 2021 at 01:40 PM, @OE3GBB wrote:

For info, just checked WSPR:

I could receive at OE3XOE several DX stations using powers of 5 and 10 mW:

Thanks for posting that - it's always nice to see others testing the low end of WSPR RF output.  When I operate as a spotter, now and then I'll send an email to stations that are declaring their power to be 10 mW or less....just to satisfy myself that they haven't accidentally mis-stated it.  For myself I verify the output power now and then, with either a spectrum analyzer, or the RF voltage measured across a dummy load using an oscilloscope.  That's something I will definitely need to do for my current round of experiments, once I find the threshold power setting that yields just one spotter station in a 24 hour period. Just like to have that little extra accuracy beyond what the step attenuator tells me.

Separately I will embarrass myself a bit here by admitting I have not yet used wsprdaemon for spotting.  I recently set up a new KiwiSDR (grid locator EN74), and once I get another Raspberry Pi I hope to give it a try.


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