Bill, The K2 produces RF about 15 to 20 ms after the KPA100 Amp Keying output goes low, so if an amplifier can be ready to accept RF input properly within that time period, it is fast enough to follow the K2.
I would deem that time 'reasonable' for a relay rated for QSK operation. If you happen to have a slow one, there are alternatives that will retain the K2s QSK operation. I have seen relay 'speedup' circuits that pull in a relay faster, alternately the amplifier relay can be replaced with a faster one or replace the relay with a PIN diode T/R switch. It may be less trouble and cost to speed up the amplifier switching than to install the CW PTT. Fast vacuum relays are available surplus, for example a pair of Kilovac HC-1 relays will switch your linear in 6 ms. See http://www.mgs4u.com/relay.htm for one source or do a google search for other sources. 73, Don W3FPR > -----Original Message----- > > On Jul 13, 2005, at 11:14 AM, W3FPR - Don Wilhelm wrote: > > > Even if you > > have a linear that you must switch in-line to transmit, the K2/100 > > amplifier > > keying output (or the add-on K2 amplifier keying partial kit for > > the QRP K2) > > will properly switch any amplifier that has a reasonable switchover > > speed. > > How fast is "reasonable"? > > How slow does the amplifier switchover have to be before we need CW PTT? > > Bill Coleman, AA4LR, PP-ASEL Mail: [EMAIL PROTECTED] > Quote: "Not within a thousand years will man ever fly!" > -- Wilbur Wright, 1901 > > -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.338 / Virus Database: 267.10.15/80 - Release Date: 8/23/2005 _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
