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Author Topic: Connecting Drake L4B amp to FTDX-1200  (Read 2810 times)
KM4GCI
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Posts: 4




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« on: August 15, 2016, 10:33:58 AM »

I just got a L4B.  I have added the Harbach ESL soft switch kit, the PS rebuild, and the RCA Vox kit.  I forget to research and purchase what I need to connect the Yaesu FTDX-1200 radio to this amp.
What cable do I need to get?
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N7LRG
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Posts: 80




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« Reply #1 on: August 15, 2016, 11:52:04 AM »

Like an ameritron arb 704?
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W1QJ
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Posts: 2986




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« Reply #2 on: August 15, 2016, 06:06:37 PM »

The Drake L4b requires a ground on transmit.  It has a 24vdc relay at about 125ma or less.  Make sure the radio can handle that.  Did you also install a soft key from Harbach?  Check your radio manual under "using radio with an amplifier" the manual will tell you where to get the ground on transmit hence, you will know what kind of cable you will need.
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ZENKI
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Posts: 1649




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« Reply #3 on: August 19, 2016, 04:46:45 PM »

If you unsure, buy a WB9KZY Key All.
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K6LO
Member

Posts: 268




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« Reply #4 on: August 21, 2016, 07:37:06 AM »

Yaesu specs the FTDX-1200 amp relay at 30v @ 500ma.  I've been keying my old Alpha 374A with it for a couple of years now.  Nothing has gone poof.
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