[Johnson] Johnson T/R Switch 250-39 Function

[David C. Hallam]

No relays.  The receiver antenna connection is electronically blocked 
during transmit.  The old TR switches have some problems but for a 
low/medium power BA station they work just fine.

David
KW4DH

Don Ehrlich wrote:
> I am thinking of bidding for Kevin's T-R switch.  I need to know if the 
> switch can provide near-QSK operation.  Does is use a fast switching relay 
> or is the transmitter connected to the antenna all of the time with 
> isolation of the receiver during transmit?
> 
> Application would be with a Ranger and my SX28A where I am presently using 
> manual switching.
> 
> Don K7FJ
> 
> 
>> I have a T/R Switch #250-39 FA on eBay, auction #220493709998, and I
>> would like to confirm it's proper operation before shipping.  Does
>> anyone know where a scan of the manual is located on the internet?
>> Short of that, can anyone  share with me the function of the PROBE
>> connector, looks like a place to put an oscilloscope probe to view the
>> RF Envelope, but that's a guess.
>>
>> Kevin K7ZS
>>
>>
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