[Drake] R4C Low sensitivity

[Darrell, WA5VGO]

S meter readings have nothing to do with sensitivity. All the S meter does 
is measure AGC action. Likewise, background noise is no indication of 
sensitivity. It is indicative of the noise floor of the receiver and the 
overall gain of the receiver. Receiver gain and receiver sensitivity are 
two different things. A receiver that does not have a noticeable peak with 
the antenna disconnected may have better sensitivity than one with a large 
increase in noise.


73,
Darrell, WA5VGO




At 01:32 PM 2/26/2006 -0500, you wrote:
>Well, just couldn't do without an R4C any longer and picked upa fairly nice
>one, but am curious about sensitivity.
>
>Its a 225xx SN with the 6EJ7 mixers.  WIth an antenna connected, atmospheric
>noise peaks up fine everywhere, and the cal signal (no antenna) is about 
>S8 on
>10 going up to about 10 over on 80.  I've touched up the alignment and that's
>all it will do, and changed out a 6EJ7 that seemed weak.  It's very usuable,
>but not quite my recollection of what to expect.
>
>Does that sound like the overall gain is till low, and are there any quick
>and easy solutions for isolating what stage might be underperforming?
>
>Thanks, Scott
>______________________________________________________________