[R-390] R390 Low Gain at 8 kHz BW

[jgedde at optonline.net]

390.  I would've said "not A" but I got hollered at for doing that.  😊

I replaced R519 and R520 since they were high, but it made no difference...  They are supposed to change the gain of the IF deck to make up for the loss in gain due to the changes in IF coil coupling with bandwidth changes.

-----Original Message-----
From: Cecil <chacuff at cableone.net> 
Sent: Wednesday, June 5, 2019 7:43 PM
To: jgedde at optonline.net
Cc: R-390 Forum <r-390 at mailman.qth.net>
Subject: Re: [R-390] R390 Low Gain at 8 kHz BW

Is this a 390 or a 390A?

Cecil
K5DL

Sent from my iPad

> On Jun 5, 2019, at 6:23 PM, <jgedde at optonline.net> <jgedde at optonline.net> wrote:
> 
> I'm having a strange issue with my R390.  It's all aligned and working 
> very well, except for the 8 kHz bandwidth.  I see about a -12 dB loss 
> in signal when set for 8kHz.  All other bandwidths are OK.  The 
> bandwidth switch is clean and passes continuity tests.  Any ideas?
> 
> 
> 
> John
> 
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