Some lack of communication between Greg and Wayne I expect regarding the published figures. Luckily, this is a simple thing to fix one would hope. I sent in a list of relay transit times on 2nd April.
It was quite clear that 20mS was needed for the smaller coaxial relays like the very commonly used CX540 and up to 50mS for the very high power relays that you might use on a 1.5kW 6m amplifier. I was surprised to discover the maximum delay was set to only 20mS as this is not enough; a margin is needed. The CX540 is common and http://www.nts-electronic.com/cx540d.htm tells me it takes 20mS to engage and 15mS to release. Tohotsu relays are very common. The CX230, CZX3500, CX600, CX800, CX140 and CX120 are often used in amateur applications (because they are cheap). They also all specify 20mS. For really high power SSB electronics (Germany) do a specialist range of relays. These specify 30mS for the HF400 series, 40mS for the HF500/1500 series and 50mS for the HF4000 series. wayne burdick wrote: > > George, > > Before settling on a max of 20 ms we looked at a number of amplifiers > and got input from several "experts. If yours (or others) really need > more than 20 ms, I can increase the delay with some additional work. > > Please contact me directly if you find out any more about your > particular delay time requirements. > > tnx > Wayne > N6KR > > On May 8, 2008, at 5:53 PM, George wrote: > >> The FAQ for the K3 promised a 0-50 ms amp keying delay. We got only >> 0-20 ms in the latest release. I don't think 20 ms is enough in my >> case, based on my primitive research. Several "experts" have said >> mine might need as much as 30-35 ms. My amp's relay is a 30 yr old >> Potter & Brumfield open frame model with a 120vac coil. > > > --- > > http://www.elecraft.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 > > -- View this message in context: http://www.nabble.com/K3-Variable-amp-keying-delay-%3E%3Enot-long-enough%21%21---tp17139573p17142608.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
