Gang
the heath series of amps use bial voltage to switch the thing from T/R and That amounts to 130 +- volts would the K3 be Ok switching this or should I look to add an additional relay and switch that Bob K3DJC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
I used the K3 to switch my SB-220 backup amp (+130 VDC) a couple
months ago. It worked fine through an entire contest. The K3 spec is +200 VDC at 5 amps. I did put a reverse diode across the relay line to prevent the possibility of negative inductive kickback. Actually, I put the diode right at the K3 via an RCA wye with the diode soldered across one leg of the wye. It was an emergency deal, but it worked fb. Dave Hachadorian, K6LL Yuma, Arizona -----Original Message----- From: [hidden email] Sent: Thursday, March 15, 2012 10:12 AM To: [hidden email] Subject: [Elecraft] switching a heath amp Gang the heath series of amps use bial voltage to switch the thing from T/R and That amounts to 130 +- volts would the K3 be Ok switching this or should I look to add an additional relay and switch that Bob K3DJC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
In reply to this post by riese-k3djc
Bob,
If that voltage is for certain positive, the answer is yes, the K3 will switch it, but if it is negative, connect your other relay. 73, Don W3FPR On 3/15/2012 1:12 PM, [hidden email] wrote: > Gang > > the heath series of amps use bial voltage to switch the thing from T/R > and That amounts to 130 +- volts > would the K3 be Ok switching this or should I look to add an additional > relay > and switch that > > Bob K3DJC > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
Hi Don and Bob,
One alternative is to put in a mod to the Heathkit amp. http://www.harbachelectronics.com/main/page_products_sb200__sb201.html I put one of the soft key mods into my SB-200. Easy to put in and works nicely. 73, tom n4zpt On 3/15/2012 2:07 PM, Don Wilhelm wrote: > Bob, > > If that voltage is for certain positive, the answer is yes, the K3 > will switch it, but if it is negative, connect your other relay. > > 73, Don W3FPR > > On 3/15/2012 1:12 PM, [hidden email] wrote: >> Gang >> >> the heath series of amps use bial voltage to switch the thing from >> T/R and That amounts to 130 +- volts would the K3 be Ok switching >> this or should I look to add an additional relay and switch that >> >> Bob K3DJC >> ______________________________________________________________ >> Elecraft mailing list Home: >> http://mailman.qth.net/mailman/listinfo/elecraft Help: >> http://mailman.qth.net/mmfaq.htm Post: >> mailto:[hidden email] >> >> This list hosted by: http://www.qsl.net Please help support this >> email list: http://www.qsl.net/donate.html >> > ______________________________________________________________ > Elecraft mailing list Home: > http://mailman.qth.net/mailman/listinfo/elecraft Help: > http://mailman.qth.net/mmfaq.htm Post: > mailto:[hidden email] > > This list hosted by: http://www.qsl.net Please help support this > email list: http://www.qsl.net/donate.html > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
In reply to this post by Don Wilhelm-4
> If that voltage is for certain positive, the answer is yes, the K3 > will switch it, but if it is negative, connect your other relay. The problem is that many "high voltage" amplifiers have significant relay current and no current limiting or reverse EMF ('catch") diode and often exhibit a large *negative* spike when the relay opens. An external relay or a "buffer" like Ampkeyer, Ameritron ARB-704, WB9KZY "Keyall", etc. is a good insurance policy. A relay or buffer is required with any negative voltage (SB-200, FL-2100, FL-2100B, etc.) key lines. 73, ... Joe, W4TV On 3/15/2012 2:07 PM, Don Wilhelm wrote: > Bob, > > If that voltage is for certain positive, the answer is yes, the K3 will > switch it, but if it is negative, connect your other relay. > > 73, > Don W3FPR > > On 3/15/2012 1:12 PM, [hidden email] wrote: >> Gang >> >> the heath series of amps use bial voltage to switch the thing from T/R >> and That amounts to 130 +- volts >> would the K3 be Ok switching this or should I look to add an additional >> relay >> and switch that >> >> Bob K3DJC >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[hidden email] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
In reply to this post by riese-k3djc
May be worth the additional key relay,, my Kenwood TL 922 quit and I can barely move it let alone try to repair it,,, Not sure what to do wit it but that is another story I keyed another SB200 with an ICOM rig and built a little 5 volt key relay but it used an external wall wart. I may dig up a 9 volt relay and key it using a 9 v battery may pick up a heath SB220 fer 60 bux from a local shouldnt be able to tell the diff 600 v 1200 watts Bob K3DJC On Thu, 15 Mar 2012 14:28:14 -0400 Tom Azlin N4ZPT <[hidden email]> writes: > Hi Don and Bob, > > One alternative is to put in a mod to the Heathkit amp. > > http://www.harbachelectronics.com/main/page_products_sb200__sb201.html > > I put one of the soft key mods into my SB-200. Easy to put in and > works > nicely. > > 73, tom n4zpt > > > On 3/15/2012 2:07 PM, Don Wilhelm wrote: > > Bob, > > > > If that voltage is for certain positive, the answer is yes, the > K3 > > will switch it, but if it is negative, connect your other relay. > > > > 73, Don W3FPR > > > > On 3/15/2012 1:12 PM, [hidden email] wrote: > >> Gang > >> > >> the heath series of amps use bial voltage to switch the thing > from > >> T/R and That amounts to 130 +- volts would the K3 be Ok > switching > >> this or should I look to add an additional relay and switch that > >> > >> Bob K3DJC > >> ______________________________________________________________ > >> Elecraft mailing list Home: > >> http://mailman.qth.net/mailman/listinfo/elecraft Help: > >> http://mailman.qth.net/mmfaq.htm Post: > >> mailto:[hidden email] > >> > >> This list hosted by: http://www.qsl.net Please help support this > >> email list: http://www.qsl.net/donate.html > >> > > ______________________________________________________________ > > Elecraft mailing list Home: > > http://mailman.qth.net/mailman/listinfo/elecraft Help: > > http://mailman.qth.net/mmfaq.htm Post: > > mailto:[hidden email] > > > > This list hosted by: http://www.qsl.net Please help support this > > email list: http://www.qsl.net/donate.html > > > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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