[R-390] Using Break-In

[K1LKY]

Ed,

Check my details with the schematic, but here goes:

If you put the function switch in the Break In Position:

GROUNDING the rear panel connection causes the radio to mute itself.  You are connecting a relay coil to ground. The relay coil works on 6.3 volts ac and draws about 40 ma of current.  Your logic type connection on back of a rice box will NOT do the right thing.

What happens is:
- the antenna relay is energized (or de-energized can't remember which) to disconnect the antenna from the input coils and to ground the antenna input connectors (Both the twinax one and the unbalanced one)
- the input to the audio amplfiers (both local and line amplifiers) is grounded.

This system is NOT QSK.  It operates in the push to talk mode and will not follow any CW keying or the like.

You need a relay or switch contact external to the receiver which connects to ground.  No source of power or "signal" is required.


Good luck.

Roy


-----Original Message-----
>From: Ed G <ed.goss at comcast.net>
>Sent: Jan 28, 2009 1:12 PM
>To: r-390 at mailman.qth.net
>Subject: [R-390] Using Break-In
>
>Hi Folks,
>     From reading about the break-in feature of the 390A, I *think* it works
>like "receiver muting" does on more modern receivers, but I wanted to get
>some other opinions. If I leave the front panel break-in switch off, I
>believe the 390 just keeps receiving (with no connections to TB103 pin 9),
>correct?  If I turn the front panel break-in switch on, what have I enabled
>circuit-wise?  Can I then ground the rear panel TB103 pin 9 and have the
>receiver mute, or does the receiver then just ground the antenna inputs, but
>allow me to hear the transmitter?
>     I guess the term "break-in" is slightly confusing, as I doubt this is
>really full QSK.
>--Ed G--
>
>
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