Re: SR40 performance and musings...
- Good thoughts, Stan.
I agree, the performance of this little rcvr is surprising,
considering the simplicity of the hardware. The filtering provided by
the software makes for a real powerful set of tools.
I have been listening to my SoftRock-80 here. covering a range of
about 3.555-3.600 Mhz using a 14.318 crystal in the LO, and my
redesigned front-end filter. It's working great. I can pull some
pretty weak stations out fairly close to the S9+25dB signal of W1AW
code practice here in NH. The Thirty meter version works great too. I
am also using a seperate source of power from the computer.
I have been doing too much experimenting to get the receivers into
permanent cases yet, but I know that will only improve something that
already works remarkably well. In time....
I have already determined the values for a 20m front end. Just need to
decide on a method to get the LO on about 56.200 Mhz.... It may be
hard to find a fundamental-mode crystal for that freq. Maybe a 3rd
overtone oscillator mounted on a plug-in that includes the new front-
I'd love to hear back from others who have done the 30m mod using the
crystals I have provided.
73, Bruce N1RX