FT-747 to SB-200 - elmers Forum at eHam.net

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eHam.net Forum : elmers : FT-747 to SB-200

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FT-747 to SB-200	Reply
by OZ6ABM on November 5, 2009	Mail this to a friend!
Hello, I am trying to connect an old Yaesu FT-747 to a Heathkit SB-200 amp. The FT-747 has an ALC phono connector, but what confuses is the connection to the ANT RELAY on the SB-200. In the FT-747 operating manual it says the Band Data connector must be used (page 8). Must I connect to pin 2 (TX GND) and what else? Then on page 12 it says that the pin 6 is used to control t/r switching of the linear amp? Can someone explain and clarify? thanks and 73 Robin OZ6ABM

RE: FT-747 to SB-200	Reply
by K0BG on November 5, 2009	Mail this to a friend!
Personally, I would not hook the SB200 to any modern radio without an interface (buffer). There are mods which allows the SB200 to be keyed with modern radios, but if that isn't the case, you'll liable to damage the radio. Alan, KØBG www.k0bg.com

RE: FT-747 to SB-200	Reply
by OZ6ABM on November 5, 2009	Mail this to a friend!
Hi Alan, You are correct, but I did modify the amp with the soft key options and I am using it with an IC-718 and FT-900 without any problem. Thing is on both the above radios the connectors are standard RCA and stand-alone for TX GROUND, while on the FT-747 it is a pin or two in an 8-pin connector and the description in the manual seems to be contradictory. 73 Robin

RE: FT-747 to SB-200	Reply
by K2DC on November 5, 2009	Mail this to a friend!
Robin, The way I read the manual, pin 8 should go to the center conductor of the SB-200 relay, center conductor, and pin 2 to the shield. 73, Don, K2DC

RE: FT-747 to SB-200	Reply
by ZS5WC on November 7, 2009	Mail this to a friend!
Hi Robin, If you have a solid state switch interface for the amp, the PTT phono connection at the back will work-for control of the rig, and for control of external equipment. I used the PTT line to switch a PNP transistor, which in turn operated a relay for a noise cancelling circuit I had built. It works fine-providing the interface does not source a very high potential-larger than 12v open CCT, or a lot of current. (Also no reverse potentials-so beware!>) You will find if you key the rig, the PTT connection at the back will be at a low potential as well. Best Regards, William ZS4L / ST0

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