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Author Topic: Keying amplifier with drake tr4/AC-3  (Read 2021 times)
WA1YDH
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Posts: 47




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« on: August 01, 2017, 09:11:59 AM »

All
Have a drake tr4 that I run with a R4a receiver--want to hook up to amp,
how do I key amp from TR4?Amp is ameritron 811h.

On my tx4c/r4c have ac-4 pwr supply--it is a simple cable from the ac-4 to the keying input on the amp. But ac-3 is different, no connection for keying.

so how connect amp to tr4?

thanks
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AK0B
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Posts: 306




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« Reply #1 on: August 01, 2017, 12:19:22 PM »

I believe all the schematics for the Drake line are on the web.  Check out the newer versions and how they did it on the L4 and L7.

Stan ak0b
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WW3QB
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Posts: 813




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« Reply #2 on: August 04, 2017, 01:38:22 PM »

The AC-3 is missing the amplifier key jack. I soldered wires to pins 5 and 6 of the AC-3 plug to get at the amplifier keying from the TR-3/4.
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WA1YDH
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Posts: 47




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« Reply #3 on: August 05, 2017, 07:03:24 AM »

Cant you pick up signal from inside
Ac3, would that be easier?

Did you drill hole in connector?

Tnx
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WW3QB
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Posts: 813




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« Reply #4 on: August 05, 2017, 07:55:31 PM »

I don't think the signal ever gets inside the AC-3. I just squeezed two more thin wires into the plug. You may want to consider getting it from inside the TR-4.
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WA1RNE
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« Reply #5 on: August 07, 2017, 09:36:29 AM »

 Get a copy of the TR-4 manual and see page 2-6. (as well as the schematic)

 The VOX receptacle on the back of the AC-4 is connected to a set of isolated normally open contacts inside the TR-4 via the power supply connector pins 5 and 8.

 As shown on page 2-6, those contacts can be used to key an amplifier.  If you don't have a matching plug you could add an RCA style receptacle to the AC-4 and wire it in parallel with the VOX receptacle.


 ...WA1RNE
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WW3QB
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Posts: 813




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« Reply #6 on: August 07, 2017, 07:08:03 PM »

Yes, it was pins 5 and 8.
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