Cody Hayden wrote:
>db pads are bandaids and not cures..get a better
>duplexer..problem solved..
>
>
It is common practice to use 6 to 10 db of attenuation between a new
high gain (typically as much as +18 db) GaAsFET low noise amplifier and
an older receiver. The gain of the preamp is about 10 db higher than
you need for the receiver yet you can gain benefits from the low noise
front end and high intermod resistance. Placing the attenuator between
the preamp and the receiver doesn't hurt the noise figure yet keeps the
receiver front end input signal within acceptable limits. It doesn't
reduce the usable sensitivity of the receiver either. The attenuator
doesn't make up for deficiencies in a duplexer but it certainly can slam
the door on other problems many of us have faced with excessive gain
ahead of our older less sensitive receiver. The result is a much lower
noise front end with moderately higher gain. Bottom line: better signal
to noise ratio.
>--- Brent <[EMAIL PROTECTED]> wrote:
>
>
>>One of my 2m repeater has a problem.<snip>
>>
73, Tony W4ZT
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