Re: Topband: WSPR and topband

[Jim Brown <jim@audiosystemsgroup.com>]

On 4/26/2023 11:17 AM, Richard Karlquist wrote:
> Also, how did you arrive at 1836.6 kHz? 
WSPR frequencies have been established since 2008, when the software was 
introduced. Typical power levels are 100mw - 1W. These signals have 
always been there, but we haven't noticed them. They can be decoded at 
SNR 15 dB below that of CW with great ops on both ends.
> Why not say 1.990 MHz to avoid QRM.
Among other reasons, international frequency allocations and antenna 
bandwidth.
73, Jim K9YC


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