From: Garey Barrell 
Subject: Re: [drakelist] Transmit/Receive switch ...New member


Garey Barrell  made an utterence to the drakelist gang
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Don -

Yeah, IF he could find one of those elusive connectors!  :-)

He sent me the schematic of the receiver, and it looks like a single 
transistor, a resistor and a 9V battery will "invert" the Mute line.  
The battery would last a year or more, probably shelf life.

If he can find a connector, or mod the AC-4 for an RCA that would 
certainly work.   Assuming he doesn't want to use an amp!

73, Garey - K4OAH
Atlanta

Drake C-Line Service Manual
http://hr99.home.mindspring.com/R-4C_Servicez/>



Don and Diana Cunningham wrote:

> Garey,
> Just a thought.  If Harry isn't going to use an amp, couldn't he use 
> the "VOX" contacts that drive a linear to accomplish his goal of 
> muting the receiver since they close upon trasmit??  Might be easier 
> for him at this juncture.
> 73,
> Don, WB5HAK
> ----- Original Message ----- From: "Garey Barrell"

> To: "Harry KC9GRV" ;
"Drakelist" 
> 
> Sent: Wednesday, February 16, 2005 2:58 PM
> Subject: Re: [drakelist] Transmit/Receive switch ...New member
>
>
>>
>> Garey Barrell  made an utterence to the 
>> drakelist gang
>> ----------------------------------------------------------------------
>> Harry -
>>
>> Figures....  The T-4X works just the opposite.   It has relay 
>> contacts that close to enable the receiver and open to disable the 
>> receiver.
>>
>> Unfortunately, there is no easy way to change this in the transmitter 
>> since this set of contacts is wired to do other things at the same 
>> time. This is a straight contact closure, so no voltage available.  
>> Depending upon what voltage is available at the JRC mute contacts it 
>> might be possible to build a small transistor driver to
"invert" the 
>> Mute control.
>>
>> 73, Garey - K4OAH
>> Atlanta
>>
>> Drake C-Line Service Manual
>> http://hr99.home.mindspring.com/R-4C_Servicez/>
>>
>>
>>
>> Harry KC9GRV wrote:
>>
>>> "Harry KC9GRV" 
made an utterence to 
>>> the drakelist gang
>>> ----------------------------------------------------------------------
>>> Hello group,
>>>
>>> First I would like to introduce myself.
>>>
>>> My name is Harry and I got upgraded to Extra
>>> from my Tech license I first received in October 2004.
>>>
>>> This is after 40 some years of procrastination.
>>> I started in the hobby by taking a Novice class at Allied radio when 
>>> they were still in Chicago in the early 60's
>>>
>>> But do to several things I never got to take the novice exam.
>>> I had the case of finding a bad elmer. Long story.
>>>
>>> I will soon be the proud owner of a TX4.
>>> I have a JRC NRD525 receiver which I love.
>>>
>>> In looking through the online manual I see the TX4
>>> has a plug to switch off the receiver.
>>>
>>> My JRC has a plug that will mute the receiver.
>>>
>>> My question:
>>> What do I need to use these two features together.
>>>
>>> The jack on the JRC is an RCA plug that when the two wires are 
>>> connected a relay clicks and the radio goes silent.
>>>
>>> I do not know how the TX4 works.
>>>
>>> Thanks in advance.
>>> 73,
>>>
>>> Harry G. Osoff
>>> KC9GRV
>>> Grid Square EN50uc
>>> Champaign, Illinois
>>> Lat & Long 40.106564 N  88.283856 W
>>> FP#-1065          NAQCC#-0211  QRP-l#-2604
>>>
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