Keith: My 2 pence worth is that the best way to do these things is with an external sequencer. The ARRL Handbook has a simple one, plus you can get them ready-made from DB6NT, Advanced Receiver Research, and I think W1GHZ sells some on eBay from time to time. The idea: you PTT the sequencer (footswitch or equivalent) and the sequencer unkeys the preamp, keys the amp, and then keys the rig, in that order. That way everything is where it should be when you speak/key the rig. If you have the rig put everything else in TX then the rig can be transmitting before/as the relays are switching over, which is a guaranteed way of replacing your preamp transistors and/or relays someday. That also implies no VOX with preamps.

At 04:23 2006-09-02, Keith Le Boutillier wrote:

Hi

I wish to switch my amp and pre amps when using the Icom 910H

Is their any way of having a switching line the changes when the rig goes into TX I have read the manual and checked the sockets on the back of the rig but can't see an aux switching line or voltage change or anything that I could use.

Dose anyone have any advice or achieved what I wish to do

73 Keith GU6EFB

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