[Elecraft] Connecting a BigIR

[jerry]

On 2025-03-15 20:01, Joe Subich, W4TV wrote:

> If the transceiver is "Split" across the 10/25/50/100 kHz
> (depending on band) boundary the SteppIR controller (all
> varieties) will command a "retune" when the frequency changes.
> It is a decidedly poor decision by SteppIR not to include a
> "PTT In" connection (parallel to amplifier PTT) to inhibit
> tuning while in transmit.

*** I had a similar issue with my homebrew LDMOS linear.  It uses
the four-wire Yaesu band codes to change bands, following the 
transceiver
around like a puppy.  I was getting problems where RF would get into the 
four
wires and momentarily change the band.  Then the protection circuit 
would kick,
turning the linear off.  I drove myself nuts with bypassing and RF 
chokes.  Nothing
quite worked.  Then - an idea - why not just ignore band changes during 
transmit?
Modified my software to do that, and problem solved.

              - Jerry, KF6VB