[TenTec] Omni D and RF preamp on SSB

[Sinisa Hristov]

Byron J Watts wrote:
 
> When i cut this preamp in on an S-0 noise level,
> i can usually bring the noise up to S5 or S7 with the gain wound all the
> way up.  If there's a signal in the noise that i can hear but can't
> copy, how much do i bring it up to put the reciever in the middle of
> it's best dynamic range or sig/noise ratio (all SSB voice).

Any S meter indication above S-0 simply means
that the automatic gain control has reduced
receiver's gain, usually resulting in
reduced sensitivity and degraded RX noise figure.
This simple fact is frequently neglected.

Additional point is that with external noise
strong enough to move the S meter, the weak
seignal capabilities are entirely detrmined
by the level of external noise, and not by the
[normally functioning] receiver.


73,

Sinisa  YT1NT, VE3EA


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April 16/17, 2005

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