[Amps] Fw: help

[Steven Katz]

Drake called ALC "AGC" on their transmitters, transceivers and amplifiers.  😊



The L-4 and L-7 "AGC" (ALC) output is negative voltage, should be perfectly compatible with the Icom if you want to connect it.   The output level (AGC) from the amp is always negative and is adjustable by the front panel potentiometer all the way down to "0V" if you want.



The instructions how to adjust the control are in the amplifier's instruction manual.



Steve WB2WIK



-----Original Message-----
From: Amps <amps-bounces at contesting.com> On Behalf Of A Lawrence Fibich
Sent: Saturday, October 22, 2022 12:58 PM
To: amps at contesting.com
Subject: [Amps] Fw: help



Guess I am not sure how to post a listing -- thanks..

Larry FW6EF

   ----- Forwarded Message ----- From: A Lawrence Fibich <lfibich at sbcglobal.net<mailto:lfibich at sbcglobal.net>>To: amps-request at contesting.com<mailto:amps-request at contesting.com> <amps-request at contesting.com<mailto:amps-request at contesting.com>>; amps-owner at contesting.com<mailto:amps-owner at contesting.com> <amps-owner at contesting.com<mailto:amps-owner at contesting.com>>Sent: Friday, October 21, 2022 at 11:32:03 PM PDTSubject: help

  Subject: Questions: Connecting a Drake Amplifier



Hit a roadblock I am not understanding. I wanted to connect a Drake L-4 Amplifier (also have a Drake L-7 - same problem). Looking at the input the unit/s want - they want AGC input - I am familiar that ALL other Amplifiers I have used accept/require ALC input.  I am trying to drive either of these units with a ICOM IC -756 - it only outputs an ALC.  Of course the definitions of AGC and ALC is not the same - or about the same functions.

Then also - beyond my understanding clearly caution in the manual ... "WARNING: Set the Transceiver output power and linear amplifier ALC output level referring to the linear amplifier instruction manual.  The ALC input level must be in the range 0 V to -4V and the transceiver does not accept positive voltage.  Non-matching ALC and RF power settings could cause a fire or ruin the linear amplifier."QUESTION: 1. How do I connect the ICOM to the Drake Amp? - ? what if not connecting anything to the AGC on the Amp?2. How could a 'non-matching ALC and RF power setting cause a fire? ?over heating the Amp?

Thanks for any assistance73W6EFLarry FibichSacramento, CA area

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