[R-390] What is the difference between 390 and 390A

[ROBERT YOUNG]

I have heard that the 390A was better than the 390 for BCB DX'ing because of 
the mechanical filters. I mostly DX for foreign DX on the BCB frequencies 
and most are very weak against very strong domestic stations sometimes 1 khz 
away. Will the mech. filters perform better for this purpose? I can put up 
with lousy ringing audio if I have to to to hear a station that would 
otherwise be obliterated by QRM from a 50KW local 2 kHz away. Actually my 
motto is you can never have enough radios anyway,

Bob


----- Original Message ----- 
From: <Flowertime01 at wmconnect.com>
To: <r-390 at mailman.qth.net>
Sent: Monday, April 11, 2005 9:41 PM
Subject: Re: [R-390] What is the difference between 390 and 390A


> Bob,
>
> >From 68 through 75 I was an Army Tech (33C) and made a living servicing 
> >R390
> and R390/A for literally thousands of Ops (05H) who made their living
> lessening to them.
>
> >From the listen point of view, there were no signals either receiver 
> >could
> not hear. Would an Op copy the signal was a different subject?
>
> The R390 IF does not ring like the mechanical filters in an R390/A a ditty 
> OP
> did not care about the IF deck ring. Us SSB and AM listeners do notice the
> difference.
>
> The R390 and R390/A are both bad mouthed for the AM audio quality. There 
> are
> easy work around.
>
> The R390 uses a pair of 6082 series voltage regulators that you can cook 
> on
> (at least heat rations). With today power line voltages in the states the 
> power
> supply regulation is over kill.
>
> Sensitive wise the receivers are pretty equal and better than any thing 
> else.
> The Army tried a lot of other receivers and the R390 R390/A were the
> intelligence intercept receivers of choice. When you need to roll up and 
> down the
> bands chasing RTTY, and Dits on a demanding schedule The R390 and R390/A 
> would get
> it on frequency and out of the atmospherics day in and day out.
>
> Now if you just want to listen to a little AM radio on Saturday afternoon,
> there are some other options.
>
> Either model any manufacture. There all above average. Once you get it
> working again you will keep it working and wonder why you were ever 
> without one.
>
> Roger. KC6TRU
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