[1000mp] (Non) Switching of RX Ant (was RX Ant Out)

[Pete Smith]

At 06:15 AM 12/12/02 -0500, you wrote:
>I'm not expert at reading schematics, especially the MP schematics, but I 
>believe the MP circuit is slightly different. The RX ANT IN goes through 
>RL-1001, which is controlled by the RX ANT switch on the front panel.  It 
>then goes through RL-1002/3 which are the switchable attenuators, and on 
>to the front end.  It does not appear that the RX ANT IN is turned off 
>during transmit.  Yikes!  Perhaps someone more expert can take a look and 
>comment.
>
>I'm also not sure that an inductor to ground through 100 ohms provides 
>much surge suppression.  Does it?


Y'know, I think I was wrong about the Mark V front end -- it now appears to 
me that only the transmit antenna is disconnected from the receiver during 
transmit, and that any separate receive antenna remains connected during 
transmit if the separate RX antenna has been selected, making some sort of 
external protection almost mandatory.

Thanks, Barry, for making me take another look.  There's nothing like a 
false sense of security to rear up and bite you.

73, Pete N4ZR
Sometimes a tower is just a tower