As far as the bandswitch is concerned, a good source for them are the guys who do the 6-meter conversions for SB-220s and SB221s, since they remove the whole bandswitch assembly. Check with Lou at King Conversions ([EMAIL PROTECTED]). He may be able to help you out. Lou does a great job with his 6-meter conversions, BTW. I'm using one with my K3, but part of his conversion is installing a solid-state buffer for the T-R line, which in the unmodified SB-220 switches 120VDC. Do NOT connect an unmodified SB-220's T-R switch line directly to the K3's T-R switch output jack. Your K3 will NOT be happy.
Bill W5WVO ----- Original Message ----- From: "Dave G4AON" <[EMAIL PROTECTED]> To: <elecraft@mailman.qth.net> Sent: Saturday, August 30, 2008 11:50 PM Subject: [Elecraft] Re: SB-221 for K3 need some help. > Don, there isn't a diode across the relay coil in an SB220 - so there > may be a nasty back emf voltage on key release. Also, the K3 maximum > keying delay is 20 mS, will the relay in a SB220 switch in that time? > > I don't want to dampen your enthusiasm, but old linears were designed > for relay contact switching and generally were slow on change over... > They can be modified, but in standard format may not work too well. > > 73 Dave, G4AON > K3/100 #80, Acom 1000 > -------------------------------- > > I found out this week that K3 is good with Heathkit > SB-220 amps, all you need to do is connect a shielded > RCA cable between the units - how easy is that? !!! > _______________________________________________ > 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 _______________________________________________ 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
