[R-390] Field Change No. 7, R390A

[Bob Camp]

Hi,

Did you try adjusting the IF gain after you put in the mod ?  On most 390's
the IF gain adjust has far more range than you would ever need. The most
sensitive point on the IF gain  is not the full gain position on the pot. It
took me quite a while to prove that to myself ....

    Take Care!

        Bob Camp
        KB8TQ


----- Original Message -----
From: "Jim M." <jamesmiller20@worldnet.att.net>
To: "Tom Warren" <wwarren1@nc.rr.com>
Cc: "Morgan, Roy" <roy.morgan@nist.gov>; <r-390@mailman.qth.net>
Sent: Thursday, January 02, 2003 10:26 AM
Subject: Re: [R-390] Field Change No. 7, R390A


> I installed the mod. to my R-390a last year to see what would happen.  I
> found that it decreased the sensitivity noticeably.  By that I mean that
> a 40 dB test signal now read 30 dB on the carrier meter.  Not an exact
> test but it was enough to convince me to remove the mod.  I did not look
> at the more esoteric effects such as harmonics or spurs.  I like a "hot"
> receiver.  If it were me, I would remove the mod and go back to the
> original values.  Jim N4BE
>