Hello Joe,

Attached your OP8 signal as received here last night on a Afedri SDR 
and mini-whip antenna. At it strongest I had aural copy. 

You probably have seen my reports on your Opera window.
These were received using a 20 dollar RTL-SDR V3 in direct sampling 
mode under SDR#. Dispite the only 8 bit ADC, it looks that it can be 
pressed in service when you use proper front end filtering.

If I am correct, an 8 bit ADC can provide a dynamic range of about 
50 dB. This is not much when compared with e.g. a PERSEUS which 
provides a dynamic range short of 100 dB. The question is how much 
dynamic range you really need in practice.

The famous Drake R4C has, as measured by Sherwood, a dynamic range 
of just 58 dB. Due to an excellent pre-selector it is a nice 
receiver.

Anyway, I am very pleased with the result.

73,
Roelof, pa0rdt

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