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1-6 of 6 messages
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Page 1 of 1
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IC706MKIIG & Ameritron AL-811H
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by N5IFH on March 16, 2003
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I know that the AL-811H provides +12VDC at 100ma on the amplifier key line but cannot find out what the IC706MKIIG will handle. Can someone point me in the right direction to find this information "in print"....Thanks...
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RE: IC706MKIIG & Ameritron AL-811H
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by KZ1X on March 16, 2003
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According to the '706 manual, the HSEND line can sink 20 mA.
You will need an interface to key your amp.
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RE: IC706MKIIG & Ameritron AL-811H
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by N4CW on March 16, 2003
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I bought a W1WEF "interface" to key an old SB-200 from my 706 MkIIG. It uses the 13-pin accessory socket on the back to power its relay, a very tiny SPST encapsulated reed relay. And, if you eventually blow it (after a few million operations), it certainly will be cheaper to replace than the Icom driver transistor for that keying line! Your concern about sinking 100 ma and shortening your 706's ability to key anything after that is well placed...use the interface.
73, Bert N4CW
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RE: IC706MKIIG & Ameritron AL-811H
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by KA2UUP on March 17, 2003
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Also, check Ameritron. Although I don't need one for my ICOM 746/AL-811H combination, I use it for safety. They have one specifically for the 706, I believe.
Good luck DE Bert @ KA2UUP
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RE: IC706MKIIG & Ameritron AL-811H
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by N6AJR on March 17, 2003
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buy the relay, and remember when you tune the 811, do it at low power, then when you use it max the power then back it off 5 or 10 watts ( using the input power level from the icom) this will make the tubes last years longer, and folks will never hear the difference. or set your alc on the 811 to do the same thing.. 73 tom N6AJR
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RE: IC706MKIIG & Ameritron AL-811H
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by W5HTW on March 17, 2003
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In my original 706, still chugging away beautifully, I made an interface for an old tube type amp with a 6 VDC keying line. There is a place inside the 706 where a keyed 12 VDC is available. One of the pins on the ACC jack is not used. I simply ran a wire from that keyed 12 VDC (12 VDC is present when the radio is in transmit mode) to that un-used pin on the ACC jack. That 12 VDC then keys a Radio Shack 12 VDC reed relay, which keys the "big" relay on the amp. Not QSK by any means, but fine for VOX or semi-breakin. If the internal old relay on the amp was faster, it would be faster. These reed relays are fast-acting in themselves, but the relay in the old amplifier isn't.
Only component required is the two buck relay from RS. And a short piece of wire. I just taped it to the ACC cord. And as someone said, heck of a lot easier to replace that relay than components inside the 706. But you do have to be very careful about where you get the keyed 12 VDC, and my original 706 may not be identical to the newer models, so I'd hate to point it out without knowing they were the same. But there IS a pin on one of the connectors on the HF transmit board that supplies 11 VDC on transmit (not 12 but it is sufficient current to operate the reed relay with no harmful effects.) I never checked to see if it also offered 12 volts on VHF, probably isn't, but then the amplifer doesn't work there, so I wouldn't need it.
Total cost of the 'interface?' Perhaps three bucks and an hour's time or less, including finding the keyed voltage. This also removes the 20 mil limitation, but you would still need to keep relay current as low as possible. The tiny RS reed relays are excellent for this, and cheap.
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