Re: {Collins} R388 TR Relay



My mistake, sorry.
I just reread the section of the manual pertaining to the break in circuit.
Putting the switch into standby would defeat the relay contacts for the B+.
Billy N6YW

> From: veniceamplifier@xxxxxxx
> Date: Mon, 22 Jul 2013 15:36:02 +0000
> Subject: Re: {Collins} R388 TR Relay
> CC: collins@xxxxxxxxxxxxx
> To: veniceamplifier@xxxxxxx
> 
> I haven't tried this with my 51J-4, but could it be that the operate switch needs to be
> in the standby position when using "remote" operation? Many receivers do require
> this condition, just not sure if it applies the R-388. My R-390 does not.
> Curious.
> Billy N6YW
> 
> > From: dickburk@xxxxxxxxxxxxx
> > Date: Mon, 22 Jul 2013 08:16:56 -0700
> > Subject: Re: {Collins} R388 TR Relay
> > CC: collins@xxxxxxxxxxxxx
> > To: veniceamplifier@xxxxxxx
> > 
> > 
> > ----- Original Message ----- 
> > From: "George Babits" <gbabits@xxxxxxxxxxxxx>
> > To: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
> > Cc: "Collins" <collins@xxxxxxxxxxxxx>
> > Sent: Monday, July 22, 2013 7:00 AM
> > Subject: Re: {Collins} R388 TR Relay
> > 
> > 
> > > Phillip,
> > >
> > > Unless I am mistaken, the TR relay in the R-388 does not 
> > > do a "full" mute. The receiver stays on with shorted 
> > > antenna and reduced gain to provide a "sidetone."  That 
> > > was a military thing.   Also, there are two versions of 
> > > the R-388.  One has speaker jack and a phone jack on the 
> > > front panel.  In the other version the speaker jack is 
> > > replaced with a switch labled "Break In - -on/off).  I 
> > > have one of each.  The one with the speaker jack I have 
> > > installed in my shack and that provides a side tone.  The 
> > > one with "Break In" is my shop receiver.  I don't know if 
> > > it mutes fully or not and the manual copy I have does not 
> > > address the 'Break-In" switch.  I have never had occasion 
> > > to apply 12 volts to the relay to see what happens. 
> > > Anyway, the "not quite muting" that you are seeing is, I 
> > > think, normal operation;  at least if your R-388 has both 
> > > speaker and phone jacks on the front panel.
> > >
> > > 73,
> > > George
> > > W7HDL
> > 
> >      The side tone is possible but the relay disables the 
> > third IF completely.  I realized after sending my answer 
> > that it may not make sense. The relay in its normal position 
> > connects B+ to the third IF and connects the antenna to the 
> > bandswitch input.  In mute it disconnects the B+ and 
> > disconnects the antenna and grounds it.  It seems to me that 
> > not muting means the B+ is still getting to the IF stage 
> > even if the antenna is disconnected.  That would not be 
> > caused by a dirty contact but might be caused by a couple of 
> > things including the relay not being energized or the 
> > contacts sticking in the operating position.  Checking the 
> > plate and screen voltage at the 3rd IF stage would show if 
> > the contacts were not opening.  I think the relay must be 
> > inspected physically to see if its actuating.  If this is 
> > one of the receivers with a switch for the mute its possible 
> > the switch is not working.  That can be checked by looking 
> > at the relay voltage at the switch. You can often clean bad 
> > toggle switches by squirting some Deoxit into the switch at 
> > the switch terminals, there is usually an opening to the 
> > inside. Toggle switches get dirty and intermittant pretty 
> > commonly especially if they are not often used.  Of course 
> > one must also look at the solder joints at the switch and 
> > relay and also at the terminals at the back of the receiver. 
> > I don't remember if my R-388 mutes completely but can check 
> > it after work.
> > 
> > 
> > --
> > Richard Knoppow
> > Los Angeles
> > WB6KBL
> > dickburk@xxxxxxxxxxxxx 
> > 
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