Hi Geoff,
>>
To be fair to the K2, the design of the variable IF filter and the use of a
MC1350G as IF amplifier and NE602 as product detector does suggest that the
K2 was not designed to cope with very strong unwanted signals close to the
operating frequency etc.
<<
Have you tried an outboard narrow preselector yet?
At www.funkamateur.de there are even 7 MHz crystal frontend filters
available.
Regarding the weak devices, using a good preselector filter, I have been
able to construct a 7 MHz receiver with a NE602 as a mixer, that can handle
nighttime conditions in the Netherlands.
73,
Roelof Bakker, pa0rdt
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