Re: [Elecraft] CORRECTION Re: SB-221 for K3 need some help.
Oops, correction. Looks like the K3 will handle the SB-220's T-R relay coil voltage after all. Sorry about that, my bad. You still need to worry about the closure timing, though. I have my K3 set to the max (20 ms) and there doesn't SEEM to be a probelm -- but I've never actually measured how longs it takes the original Heath frame relay to close. You really should do that. Bill W5WVO - Original Message - From: Bill W5WVO [EMAIL PROTECTED] To: Dave G4AON [EMAIL PROTECTED]; elecraft@mailman.qth.net Sent: Sunday, August 31, 2008 3:10 PM Subject: Re: [Elecraft] Re: SB-221 for K3 need some help. 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
[Elecraft] CORRECTION Re: SB-221 for K3 need some help.
Thanks Bill, I don't *think* I received any special treatment from the factory, I just sent and email to the guy that created the transceiver. Amazing. I got a response in less than an hour, a quote from an actual user of my configuration. To those reading this, Elecraft will spoil you for life, never think about buying anything other - hi. Yes, I turned off QSK and have a decent long delay in semi-break in. I had a QSO with NH6SV tonight and he reports a clean signal st 599. I thought I had Tom cornered on no reason to install that soft key but I like his answer. In addition, I had the amp apart several times today and it provided me with a renewed respect for that little innocent looking line. ;-) Beforte that comment he made, I would not have bothered shutting off both units before connecting / disconnecting. Until or unless I install soft key, will maintain that procedure. .. [Elecraft] CORRECTION Re: SB-221 for K3 need some help. Bill W5WVO w5wvo at cybermesa.net Sun Aug 31 17:17:45 EDT 2008 Oops, correction. Looks like the K3 will handle the SB-220's T-R relay coil voltage after all. Sorry about that, my bad. You still need to worry about the closure timing, though. I have my K3 set to the max (20 ms) and there doesn't SEEM to be a probelm -- but I've never actually measured how longs it takes the original Heath frame relay to close. You really should do that. Bill W5WVO ___ 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
Re: [Elecraft] CORRECTION Re: SB-221 for K3 need some help.
Oh - by the way - my Sb-221 bandswitch is in a shambles but I hard wired the amp for 20 meters until a new switch arrives. I learned a valuable lesson, bandswitches are delicate, close tolerance devices - don't ever try to repair one that is cracked - hi - but the contacts can be replaced if the wafer is good. Time was, I would never consider working on an amp - too intimidating. But after a couple K2's, soldering up those big anough to fit in your hands parts seemed to be a piece of cake!!! --- Don Rasmussen [EMAIL PROTECTED] wrote: Thanks Bill, I don't *think* I received any special treatment from the factory, I just sent and email to the guy that created the transceiver. Amazing. I got a response in less than an hour, a quote from an actual user of my configuration. To those reading this, Elecraft will spoil you for life, never think about buying anything other - hi. Yes, I turned off QSK and have a decent long delay in semi-break in. I had a QSO with NH6SV tonight and he reports a clean signal st 599. I thought I had Tom cornered on no reason to install that soft key but I like his answer. In addition, I had the amp apart several times today and it provided me with a renewed respect for that little innocent looking line. ;-) Beforte that comment he made, I would not have bothered shutting off both units before connecting / disconnecting. Until or unless I install soft key, will maintain that procedure. .. [Elecraft] CORRECTION Re: SB-221 for K3 need some help. Bill W5WVO w5wvo at cybermesa.net Sun Aug 31 17:17:45 EDT 2008 Oops, correction. Looks like the K3 will handle the SB-220's T-R relay coil voltage after all. Sorry about that, my bad. You still need to worry about the closure timing, though. I have my K3 set to the max (20 ms) and there doesn't SEEM to be a probelm -- but I've never actually measured how longs it takes the original Heath frame relay to close. You really should do that. Bill W5WVO ___ 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
