[ARC5] muting

[John Saxon]

This is John, K5ENQ, in Pearland, TX.  I am putting together a T-22/R-23/MD-7 station.  I am "integrating" them into a more transceiver-appearing rig.  I was inspired by the Collins TCH that has a separate Tx & Rx, but put in one box.  I am doing my own control panel that includes extra relays.  I am doing the TR switching in  my own relays (I couldn't get the cosmetics I wanted using the BC-442-A relay).

For muting I am doing the usual switch antenna and ground Rx antenna input.  For volume, I am switching the Rx sensitivity line between a Rx and a Tx sensitivity pot.  So I can have my Tx pot turned almost off and it switches to the normal Rx for receive.  I haven't tested this with the Tx working, as I have yet to complete the HV power supply for the T-22.

I will also state that the T-22 & R-23 I was fortunate enough to get appear pristine and unmodified.  The MD-7 is also in very good shape.  When done here I can unplug/remove the units and use them cabled up as originally used.

73,
John
K5ENQ





On Friday, January 17, 2014 8:27 AM, Mark K3MSB <mark.k3msb at gmail.com> wrote:
 
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?
>>>
>>>
>>>
>>> ______________________________________________________________
>>> ARC5 mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/arc5
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:ARC5 at mailman.qth.net
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html

>>>
>>>  ______________________________________________________________
>> ARC5 mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/arc5
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:ARC5 at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>>
> ______________________________________________________________
> ARC5 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/arc5
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:ARC5 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
______________________________________________________________
ARC5 mailing list
Home: http://mailman.qth.net/mailman/listinfo/arc5
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:ARC5 at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html