[R-390] R-390A Operation Question

[Dan Martin]

SSB signal distortion with the rf gain full on is normal and typical for a radio like the 390A with only a BFO and no product detector function.

For readable SSB, turn your BFO on, your rf gain “about” 1/2 way down, and your audio up a bit. You can turn your AGC off but if your rf gain is reduced and set right, it won’t practically matter if your AGC is on or off.

Massage the rf gain and bfo back and forth for the most readable voice.

With no product detector and sans any user mods the 390A isn’t really an SSB receiver. By interacting with those three or four controls above it can do OK.

Dan

Sent from my iPhone

> On Dec 31, 2017, at 8:47 PM, Larry H <dinlarh at att.net> wrote:
> 
> Hi Tom,  The hissing noise that I heard from your recording sounds normal to me for a weak station (it increased when switching to 8kc and then more on 16kc).  
> As for the distortion with the RF gain on max - that is normally an agc problem, especially receiving ssb.  Do you have the Dr. Langford '2 diode fix' installed for this?  If not, you could totally fix that with it and my correction to it.  I couldn't tell which agc speed you were using from the video, sometimes medium or fast works better.  Try all 3.
> Good work on the R-390A.  Regards, Larry
> 
> 
> 
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