K3: Keying SB-200
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I'm just about to connect the KEY OUT to the SB-200 relay.
I hope the little transistor in the K3 can take it! VE7XF _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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DON'T DO IT! The SB200 applies Minus 140 volts or so to the relay control
jack and the K3 can not control it. You could damage the K3. Don K7FJ ----- Original Message ----- From: "Ralph Parker" <[hidden email]> To: <[hidden email]> Sent: Saturday, November 22, 2008 17:26 Subject: [Elecraft] K3: Keying SB-200 > I'm just about to connect the KEY OUT to the SB-200 relay. > I hope the little transistor in the K3 can take it! > > VE7XF > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > 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: [hidden email] 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 |
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In reply to this post by Ralph Parker
Ralf, just make up a simple interface between your K3 keying and the keying input of your SB-200 or look for one of those interfaces that Yaesu had available and I believe that Ameritron offers one as well. Fern VE7GZ
----- Original Message ----- From: "Ralph Parker" <[hidden email]> To: <[hidden email]> Sent: Saturday, November 22, 2008 5:26 PM Subject: [Elecraft] K3: Keying SB-200 I'm just about to connect the KEY OUT to the SB-200 relay. I hope the little transistor in the K3 can take it! VE7XF _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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A cheap 12V relay with a diode across it works great for me in this
application. No problems with my SB200 and the K2 or K3. Phil NS7P -----Original Message----- From: [hidden email] [mailto:[hidden email]]On Behalf Of Fern Rivard Sent: Saturday, November 22, 2008 9:54 AM To: [hidden email]; Ralph Parker Subject: [Elecraft] K3: Keying SB-200 Ralf, just make up a simple interface between your K3 keying and the keying input of your SB-200 or look for one of those interfaces that Yaesu had available and I believe that Ameritron offers one as well. Fern VE7GZ ----- Original Message ----- From: "Ralph Parker" <[hidden email]> To: <[hidden email]> Sent: Saturday, November 22, 2008 5:26 PM Subject: [Elecraft] K3: Keying SB-200 I'm just about to connect the KEY OUT to the SB-200 relay. I hope the little transistor in the K3 can take it! VE7XF _______________________________________________ Elecraft mailing list Post to: [hidden email] 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: [hidden email] 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 |
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In reply to this post by Ralph Parker
Ralph,
If your SB-200 has not been modified, its relay voltage is negative, and THAT will cause problems. The HEXFET in the K3 will take up to 200 volts, but that must be a positive voltage. I would suggest adding a small relay in the SB-200 - rectifying the filament voltage at the transformer with a full wave rectifier and a capacitor should produce about 8 volts - a resistor could be added in series to reduce the voltage at the new relay to about 6 volts. YMMV, but that is the way I would do it. The original wire to the RELAY jack would go to a NO contact on the relay (other side of the contact to ground), and the side of the new relay not connected to the newly formed power source connects to the RELAY jack. That way everything is contained in the SB-200 and no need for external boxes or sources of relay power. 73, Don W3FPR Ralph Parker wrote: > I'm just about to connect the KEY OUT to the SB-200 relay. > I hope the little transistor in the K3 can take it! > > VE7XF > > _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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In reply to this post by Ralph Parker
And the answer is?????? I've been led to believe this isn't such a good
idea, and that you should use one of those amp keying kits that the Heathkit Shop sells. I've got an old SB-200 sitting around here, but I've been afraid to try it! Dave W7AQK ----- Original Message ----- From: "Ralph Parker" <[hidden email]> To: <[hidden email]> Sent: Saturday, November 22, 2008 5:26 PM Subject: [Elecraft] K3: Keying SB-200 > I'm just about to connect the KEY OUT to the SB-200 relay. > I hope the little transistor in the K3 can take it! > > VE7XF > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > 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: [hidden email] 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 |
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In reply to this post by Ralph Parker
I can thoroughly recommend Harbach Electronics' SK-201 keying kit for the SB200. Easy to fit and doesn't break the bank. Reduces keying requirements to about a volt at 1.5mA and you can use it with any rig. http://www.harbachelectronics.com/main/page_products_sb200__sb201.html I have no connection with the company. 73 Norman - GM4KGK K3 #1139. |
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I installed this Harbach kit on two SB-200s I have. It takes very little time and the peace of mind is worth it. You might as well install the soft-start and soft-key mods at the same time - they go roughly into the same place on the underside of the SB-200. Pictures: http://w7brs.com/sb200 Works fine on my K3. -- Jeff Wandling DE W7BRS K3 #2105 http://w7brs.com/k3 [hidden email] On Sat, 22 Nov 2008, GM4KGK wrote: > > > > Ralph Parker wrote: >> >> I'm just about to connect the KEY OUT to the SB-200 relay. >> I hope the little transistor in the K3 can take it! >> >> VE7XF >> > > I can thoroughly recommend Harbach Electronics' SK-201 keying kit for the > SB200. > Easy to fit and doesn't break the bank. Reduces keying requirements to about > a volt at 1.5mA and you can use it with any rig. > http://www.harbachelectronics.com/main/page_products_sb200__sb201.html > > I have no connection with the company. > 73 > Norman - GM4KGK > K3 #1139. > > -- > View this message in context: http://n2.nabble.com/K3%3A-Keying-SB-200-tp1565952p1566545.html > Sent from the Elecraft mailing list archive at Nabble.com. > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > 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: [hidden email] 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 |
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In reply to this post by w7aqk
Forexample: A very simple fix is to use a OptoMOS relay. The
LCA110 from CLARE can key 350V 120 mA, cost seems to be a little over 2 USD. / Jim SM2EKM ------------------------ David Yarnes wrote: > And the answer is?????? I've been led to believe this isn't such a > good idea, and that you should use one of those amp keying kits that the > Heathkit Shop sells. I've got an old SB-200 sitting around here, but > I've been afraid to try it! > > Dave W7AQK > > > ----- Original Message ----- From: "Ralph Parker" <[hidden email]> > To: <[hidden email]> > Sent: Saturday, November 22, 2008 5:26 PM > Subject: [Elecraft] K3: Keying SB-200 > > >> I'm just about to connect the KEY OUT to the SB-200 relay. >> I hope the little transistor in the K3 can take it! >> >> VE7XF >> _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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