David VK2NU wrote :- Thanks for all the responses to this - much appreciated.
I'm afraid it was a simple case of me not reading the instructions on the keying circuit. The FL-2100B pulls 20v on its keying input, whilst the circuit for the K2 is only designed for 5-12v !! This is clearly written on the instructions with the circuit, which I neglected to read. Does anyone have details of a simple circuit I can build, so I can use this with my FL-2100B ?? Again, many thanks for the all the replies !! David, VK2NU Hi David - go to http:www.qsl.net/icom/ampcontrol.html There you will see two very simple and reliable interface circuits that will enable almost any amp to be keyed safely by almost any transceiver. To take care of older (high keyline voltage) amps, use MJE340 and MJE350 (negative and positive keying respectively). I built mine in old Colman's Mustard tins, two RCA sockets - powered by the amp relay volts - easy 10 minute job.<G> Using the amp keying circuit by Tom N0SS, my K2s happily key an L4B, or any of the other amps in the shack. Apparently Icom had a problem with keying relays in some of it's transceivers - hence the need for these interfaces. 73, Ken ZL1AIH _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
