[OZAPRS] FM92 preamp

[Ray Wells]

Gavin Rogers wrote:
> Ray Wells wrote:
>   
>> The radio has been replaced with an FM92 (was FM828), and a rx pre-amp. 
>> Sensitivity is about 5dB better now at about 0.1uV.
>>     
>
> Hi Ray.
>
> What sort of preamp are you using on the '92?
>
>
> Gavin.
>
>
>   
Gavin,

Really old using a BF981. The whole thing should have started from 
scratch but why re-invent the wheel when something works, albeit not 
optimally?

The hardest part of the exercise was mounting two more BNC sockets on 
the radio so the pre-amp could be;
a) mounted externally and,
b) taken out of circuit if something went wrong

One day I might build something different using a gasfet, but then 
again, I might not.

Gordon McDonald, VK2ZAB described a pre-amp using the BF981 in June 1984 
AR The active device is no longer available but I have a few here if you 
really didn't want something more modern. They were an old Philips device.

Ray vk2tv