[ARC5] muting

[WA5CAB at cs.com]

In a normally connected MF/HF Command Set, keying a transmitter does not 
short the receiver audio output (to ground).  It disconnects the receive audio 
lines in the receiver rack and control boxes from the receivers and 
connects them to the side tone line from the modulator.

Robert D.

In a message dated 1/17/2014 8:27:02 AM Central Standard Time, 
mark.k3msb at gmail.com writes: 
> That’s the BC-442 antenna relay.   I’m using one, but I’ve added a small
> SPST switch that I manually flip to close the relay on transmit (instead 
> of
> letting it open and close every time I send a dot / dash…..).      Even
> with the RX shorted you’ll still need to reduce the Sensitivity.
> 
> 73 Mark K3MSB
> 
> Sent from my Android phone
> On Jan 17, 2014 9:04 AM, "John Hutchins" <jphutch60bj at gmail.com> wrote:
> 
> >Ray -
> >     Not an ARC-5 expert but there is an external ANT relay box that 
> shorts
> >the Antenna to ground and if I remember correctly has a current meter on
> >the transmit leg of the relay?
> >Hutch
> >On 1/17/2014 7:32 AM, Mark K3MSB wrote:
> >
> >>Hi Ray –
> >>
> >>No schematics here at the office so I’m going from memory, always a
> >>dangerous thing for me to do.
> >>
> >>The Receiver rack contains relays that short the audio line when you
> >>transmit.  If you don’t have the rack you can do this with an external
> >>relay.  However, shorting the line means you have no side tone for
> >>spotting
> >>and monitoring of you on-the-air signal.
> >>
> >>I do not short the audio during transmit.  I find that just turning down
> >>the receiver sensitivity control to almost minimum gives me audio at a
> >>reduced level for both of these purposes.   This means you have an extra
> >>step when switching between transmit and receive, but for typical 
> vintage
> >>type QSOs this doesn’t matter as the guy on the other end also needs a
> >>small time delay to do the same thing.
> >>
> >>73 Mark K3MSB
> >>
> >>Sent from my Android phone
> >>On Jan 17, 2014 12:12 AM, "RAY FRIESS" <rayfrijr at msn.com> wrote:
> >>
> >>  I have an ARC 5 receiver/transmitter pair for 40 meters.  The receiver 
> is
> >>>all ready to go, having had the usual
> >>>mods done to it.  The transmitter is still in original condition, ready
> >>>to
> >>>be modded to be put on the air.
> >>>
> >>>I have a question that I've been trying to find an answer to, but have
> >>>been unable to find it addressed anywhere,
> >>>such as in the handbooks or other ARRL publications.
> >>>
> >>>The question I have is, how do I mute the receiver when I'm 
> transmitting?
> >>>
> >>

Robert & Susan Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480