Icom 718- ALC modification for AM possible?

[Shadetree Mechanic]

The 718 is an excellent AM rig after a few adjustments. Get inside and turn the modulation up and the carrier down. Run the audio into the accessory port in the back.

 

[Shadetree Mechanic]

Icom IC-718 Service Manual

I came across the service manual for the 718, thought I would share. https://www.manualslib.com/manual/792930/Icom-Ic-718.html?page=19#manual

www.worldwidedx.com

 

[NZ8N]

Icoms on AM, external ALC mod

A site dedicated for the AM Radio Amateur and vintage radio. Home of the AM Press/Exchange, The AM Forum (the largest BBS of it's kind),and The AM Classifieds, Photos, Audio, and technical information. Audio and Video chat rooms.

amfone.net

A 9v battery hooked up as a Negative Voltage into the ALC port on the back of the radio, through a potentiometer.

 

[Shockwave]

One simple trick that works on many HF rigs, is injecting line level audio into the radios carrier or drive control circuit. If these are potentiometers, it's easy to inject through a coupling cap to block DC. If the audio lacks high frequency response, look for high value bypassing caps, shunting the audio to ground, and reduce their value so they are only effective at RF. ALC will still require adjustment to unlock this potential.