[Johnson] Johnson T-R Switch Receiver muting

[Harry Vaught, KT4AE]

Rodger,

I had understood from somewhere that the receive connection was grounded 
in transmit, but looking at the schematic, it appears to be cut off, but 
not grounded.  The "manual" mentions two degrees of isolation.  I'd 
appreciate your read on this.

The relay mod only operates on the muting terminals.

I'm not interested in QSK, only semi-break-in.  It seemed so crude to 
have to operate a switch when going back and forth from send to receive. 
  I was trying to get the same functionality with a classic piece of 
Johnson gear that I have with the HT-44 as constructed and the HT-32 
using an MFJ RF-sensing switch.

I have the auxiliary pot you speak of on all my Halli's. I learned of it 
in the SX-117 manual.

Anyway, having thought that the switch grounded the antenna, I tested 
the effect of this externally by shorting the antenna cable which had 
little effect, but actually disconnecting the antenna by a millimeter or 
so worked.  This was a week or two ago and I've slept since then.  I'll 
try it again.

More testing may be required.  I do have another of the reed relays. 
The little bug legs on the thing are so fragile, I broke too many off 
the first one I had so when I reordered, I got two.  Fortunately, I 
still have one left.

Harry, KT4AE


On 5/10/2012 10:01 AM, WQ9E at btsnetworks.net wrote:
> Harry,
>
> I will have to go back and look at the ER article but what is the reed relay configured to do?