Have you tried the inhibit pin (pin 7) of the accessory connector? It will hold off rf output until set low. Those serious VHF/UHF/Microwave ops already probably have sequencers. This can just be a part of the sequencing. See page 19 of the manual.
Early K3's apparently didn't meet the transmit/receive cycle time for various digital modes. Too slow. 10ms helps it do so. So the needed delay isn't just a HF/UHF/VHF/Microwave issue. It is also a mode issue. de K3KO AD6XY - Mike wrote: > > This is a mots worrying post. I think it demonstrates considerable > ignorance of the many and varied applications of the K3. There is so much > more to life than HF. > > How do you suggest we speed up a waveguide relay to 10mS? > > > > > > Fern Rivard wrote: >> >> Hi Ian and the group: >> >> I would suggest that you fix/modernize your old amplier and leave the >> K3 as is! The problem is NOT with the K3 but rather your amplifier. >> Upgrade the darn linear with more modern faster switching relays and >> vacuum relays are not that expensive if you shop around for some good >> used ones. >> >> 73 from Fern VE7GZ with a fine K3 transceiver >> >> >> >> >> >> >> ----- Original Message ----- >> From: "Ian White GM3SEK" <[EMAIL PROTECTED]> >> To: <elecraft@mailman.qth.net> >> Sent: Thursday, March 20, 2008 11:31 AM >> Subject: Re: [Elecraft] K3 and linear amp >> >> >> Roger Marrotte wrote: >>>I guess as of now I'm out of luck if I want to use my amp with a K3. I >>>just checked the manual for my AL-811H and "The open frame relay in the >>>AL-811H takes approximately 15ms to switch states". My K3 is on order. >>>I hope there's a K3 firmware change made before I get my K3, that will >>>allow me to adjust the change over timing. I'm far from an expert with >>>amps. I have no idea what an average switch over time is for amps in >>>general. Ameritron sells a high speed switching option, the QSK-5, >>>that reduces the switching time to 1ms. It costs around $300.00. A K3 >>>firmware change would sure be less expensive. >>> >> That firmware change is surely needed, but there is another inexpensive >> way which often works - speed up that open-frame relay. >> >> The circuit shown in the link below uses the existing relay supply rail, >> and it will shorten the switching time of most relays by about one-half. >> The same circuit will also convert many older amplifiers to a modern >> standards +12V, low-current switch interface. >> >> http://www.ifwtech.co.uk/g3sek/in-prac/best-of.htm#speedup >> >> >> -- >> >> 73 from Ian GM3SEK 'In Practice' columnist for RadCom (RSGB) >> http://www.ifwtech.co.uk/g3sek >> _______________________________________________ >> 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 >> >> >> -- >> No virus found in this incoming message. >> Checked by AVG Free Edition. >> Version: 7.5.516 / Virus Database: 269.21.7/1331 - Release Date: >> 3/16/2008 10:34 AM >> >> >> _______________________________________________ >> 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 >> >> > > -- View this message in context: http://www.nabble.com/K3-and-linear-amp-tp16180386p16197029.html Sent from the Elecraft mailing list archive at Nabble.com. _______________________________________________ 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
