> "Michael Singewald N1PLH" <[EMAIL PROTECTED]> wrote:
> 220 Hamtronics receiver (very old, no labeling on
> the board).
The early receivers don't have a very selective or
dynamic rf front end. Blocking and desense is a
common problem with the early type less protected
receiver front end circuits in repeater service.
A good fix would be to install the Hamtronics
HRG-450 Helical Resonator Amplifier in front of the
receiver.
You can pick the Helical unit with or without a preamp.
I bought and used the preamp included HRG-450 Helical
on the same exact receiver and it worked very well.
Adding a Helical Front end pre-selector makes a lot
of early receivers semi usable. They are a welcome
addition to converted Midland 13-509 and Clegg to
repeater radios.
cheers,
skipp
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