[Elecraft] K3/Heath SB-200
Hi everyone... Has anyone used a Yaesu FRB-757 Relay Box connected to a K3? The FRB-757 requires 12 volts but there is no indication in the instructions if the FRB-757 draws more than .5 amps. My Alpha 87a is going into the shop and I need my SB-200 as a backup. I haven't had time to put the Harbach Softkey mods in the SB-200 yet. Too much time playing with the K3! Thanks. Larry, KN8N __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K3/Heath SB-200
Larry, Why not measure the current. Break the positive 12 volt Power Supply connection and insert your DMM set to measure current. Then short the keying input line on the relay box. You DMM will tell you how much current is being drawn. A new K3 has a 1 amp rating on the 12 volt output. Older K3s can be upgraded with the kit from Elecraft. 73, Don W3FPR On 3/4/2014 6:37 PM, Larry Boekeloo wrote: Hi everyone... Has anyone used a Yaesu FRB-757 Relay Box connected to a K3? The FRB-757 requires 12 volts but there is no indication in the instructions if the FRB-757 draws more than .5 amps. My Alpha 87a is going into the shop and I need my SB-200 as a backup. I haven't had time to put the Harbach Softkey mods in the SB-200 yet. Too much time playing with the K3! Thanks. Larry, KN8N __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net 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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K3/Heath SB-200
the output relay is driven/switched by a transistor should be little current involved the heath keys off the final bias supply ?? 130 volts and a fair amount of current I would always use an interface between a modern rig and any older amp the ol heath amps are a fantastic deal with or without the harbach mods I just completed mine with an upgrade for the fan the soft start/key and power upgrades are well worth the price and the fun of installing Harbach makes a good product and support Bob K3DJC dnt b On Tue, 04 Mar 2014 19:08:12 -0500 Don Wilhelm w3...@embarqmail.com writes: Larry, Why not measure the current. Break the positive 12 volt Power Supply connection and insert your DMM set to measure current. Then short the keying input line on the relay box. You DMM will tell you how much current is being drawn. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
