[MRCA] [Milsurplus] RS-6 Set. Oddity

[Al Klase]

You guys are trying to confuse me. (That's my job.)

Yes, both the RS-1/GRC-109 and the RS-6 ground the receiver antenna 
connection with the key, as a form of TR switching.. You'll notice that 
the rest of the keyed circuits in the TX are isolated from the receiver 
antenna by RF chokes.  The RS-1/GRC-109 definitely have a suck-out 
problem impacting the receive signal strength, because the RX antenna is 
connected to the TX output circuit all the time.  They were obviously 
trying to get away really cheap.

The RS-6 adds a TR rely to solve the suck-out problem.  It's not 
straight forward, as the TX idle current holds the relay in the actuated 
(receive) position when the TX is NOT keyed.

Al

Al Klase -- N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/

On 11/22/2015 1:28 PM, Tim wrote:
> Hi guys - yep, that's it.  Receiver muting/front end protection.  The 
> RS-1 and GRC-109 sets use the same technique.  Simple and effective.
> 73, Tim
> N6CC
>
> On Sun, Nov 22, 2015 at 8:18 AM, WA5CAB--- via MRCA 
> <mrca at mailman.qth.net <mailto:mrca at mailman.qth.net>> wrote:
>
>     Receiver mute.  According to the manual:
>
>     "When the key is closed, the terminal labled REC ANT is grounded
>     through C115 (.01) to prevent the transmitted signal from
>     paralyzing  the receiver.".  Saves a relay contact.
>
>     Robert Downs - Houston
>     wa5cab dot com (Web Store)
>     MVPA 9480
>
>     In a message dated 11/22/2015 07:12:48 AM Central Standard Time,
>     arc5 at ix.netcom.com <mailto:arc5 at ix.netcom.com> writes:
>>     Tim, N6CC has a web page dedicated to the RS-6.
>>
>>     http://www.n6cc.com/the-rs-6-radio-set
>>
>>     Scroll down and you will see a schematic of
>>     the transmitter.  Odd-  Why is the "REC ANTENNA"
>>     terminal connected to the keying buss via a .01 cap??
>>
>>     73 Dave AB5S
>
>
>
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