[R-390] R-390a question

[Tony Casorso]

Thanks to everybody on this. I had already used Chuck Rippels method of 
setting the gain which sets it much lower than the manual does. Based on 
recommendations here, I tried to turn down the gain until the MGC and AGC 
modes sounded similar at a quiet spot on the dial. I couldn't quite get 
there with the gain all the way down. I ran the receiver that way for about 
5 minutes but it just didn't seem right so I set it back where it was.

It seems to me that moving the gain all over the place would have a big 
effect of intermod/overload performance (the gain control is in the 3rd IF) 
and that setting it by the book probably is correct from this perspective. 
Chuck set it in order to optimize sensitivity I believe. I guess it depends 
on what you are trying to achieve.

Tony


----- Original Message ----- 
From: <Flowertime01 at wmconnect.com>
To: <R-390 at mailman.qth.net>
Sent: Wednesday, February 13, 2008 11:03 AM
Subject: Re: [R-390] R-390a question


> Tony,
>
> This is a clue you maybe have some good tubes in your R390 or the IF gain
> control is set to high.
>
> Find that sweet quite spot on the dial again.
> Set the Function switch to AGC.
> Back the IF gain down until the AGC voltage drops off to zero.
>
> You may slide to zero very nicely or the AGC voltage on the terminal board
> jumper may just go over a cliff to zero. If so then set the IF gain with 
> just a
> little voltage.
>
> Try this for a few days and decide if you like the way the receiver 
> sounds.
>
> It depends on if you are doing easy listening or trying to pull a CW DX 
> out
> of the crud. Some applications like more IF gain and MGC mode while other
> prefer a more balanced receiver setup.
>
> Play with the IF gain against the RF and audio gains. There are 
> differences
> in output beyond just the meter levels. To each his own.
>
> Roger AI4NI   </HTML>
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