[R-390] Break In Operation of R-390 & CV-591 Converter

[David C. Hallam]

Bob,

I took a look at the R-390 manual.  I think your suggestion will be exactly
what I want.  I am primarily looking for PTT operation.  Break in CW can
come later.

I can use contacts on the operate relay in my Invader to activate the break
in circuit in the R-390 which grounds the antenna input.  With external
contacts on my Dow Key antenna change over relay, I can open the RF gain
terminals on the rear to disable the 1st RF amplifier.  That should do
disable the receiver on transmit.

73
David

-----Original Message-----
From: r-390-bounces at mailman.qth.net
[mailto:r-390-bounces at mailman.qth.net]On Behalf Of Robert Meyer
Sent: Monday, January 09, 2006 10:30 AM
To: r-390 at mailman.qth.net
Subject: Re: [R-390] Break In Operation of R-390 & CV-591 Converter


When I set my station up (Central Electronics 200V and R-390A), I pondered
this
problem to great length.  I can't run full breakin on CW but I did manage to
get some interesting things done.

I connected a pot through a relay to the RF-Gain terminals on the back of
the
R-390A.  I have an antenna relay that allows a tiny bit of coupling across
from
the transmitter when it's switched to transmit mode (although there's
probably
sufficient leakage through coax cables to make this unnecessary.  When the
station is in recieve mode, the RF-Gain relay shorts the terminals on the
back
of the R-390A so that I get full gain on receive.

The benefit of this method is that I can get sidetone through the receiver
so
that I can tell if I'm getting artifacts on my CW (chirps, etc.), can tell
if
I'm drifting, etc.  Also, if I'm using headphones on SSB, I can hear the
side-tone.  This has worked well since 1981.  I imagine if you wanted full
breakin, you could use some kind of solid state switch on the RF-Gain
external
pot but I have no idea how fast the R-390A reacts to changes in this gain.

YMMV

'73 de N2DXN
Bob Meyer

P.S. If Paul, K2LMQ is still on list, my old Email died but this one works
for
me, now!


--- Joe Foley <redmenaced at yahoo.com> wrote:

>
>
> --- "David C. Hallam" <dhallam at rapidsys.com> wrote:
>
> > Has anyone had any experience operating break in
> > with the R-390 and & CV-591
> > converter.  My set is not fully muting when the
> > break in relay is activated.
> > I can hear the relay(s) pull in and the audio output
> > from the CV-591 drops
> > but I can still hear the station so I gather there
> > is still RF getting
> > through the antenna relay.  Is it just maybe dirty
> > contacts on the antenna
> > relay, or is there something else I need to do?
> +++++++++
> Yes, you'll need to reduce the RF GAIN on every
> transmission, that's why so many RF GAIN pots are worn
> out.  This is a common problem with the R-390's.
>
> Joe
>
>
>
>
>
>
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