[1000mp] 1000MP and SB220

[Pete Smith]

At 11:14 AM 11/15/02 -0500, you wrote:
>Does anyone have any suggestions for using the original MP and SB-220 to 
>allow the use of QSK when using the MP barefoot without the relay 
>chattering and also use the amplifier?

You must replace the T/R relay subsystem with one that will support the 
required switching speeds.  Typically, that means vacuum relays and some 
homebrewing -- see AG6K's web site for a proven design on the output.  An 
alternative that I think should work is Ameritron's outboard QSK unit, 
which uses PIN diodes.  The issue there, I've read, is that the diodes are 
somewhat fragile and intolerant of high SWRs resulting from off resonance 
operation, operator error, etc.

The original relay design is pretty slow and can damage some transceiver 
relays.  I wouldn't try a direct connection to your mark 5, even with the 
linear switch on.

73, Pete N4ZR
Sometimes a tower is just a tower