[1000mp] RX Ant Out

[Pete Smith]

At 04:46 PM 12/11/02 -0500, you wrote:
>Can someone please describe the functionality of the rx ant out jack?
>

I forget whether Barry has an MP or a Mark 5.  The function of the RX 
IN/OUT jacks is addressed on page 3 of the Mark 5 technical overview, which 
confirms what everyone's saying, that it provides a place where various 
preamps, filters, etc. can be placed in the circuit from the transmit 
antenna to the receiver.

It appears that RL-1002 in the Mark 5 opens the RX input line to protect 
the receiver from RF coming in on a separate receive antenna when the 
transceiver itself is transmitting.  The overview also says that the Mark 5 
incorporates a surge suppressor on the RX antenna circuit -- looking at the 
schematic, it appears that there's a small inductor in series with a 
100-ohm resistor to ground which presumably does this job.  It would be 
interesting to know from someone more technically qualified than I am 
whether this surge suppressor affords any useful protection for the front 
end from strong signals originating in another transmitter, for example in 
an SO2R setup.


73, Pete N4ZR
Sometimes a tower is just a tower