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Author Topic: IC-718 and AL-80B ALC issues  (Read 1113 times)
KB8BAB
Member

Posts: 101




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« on: December 21, 2012, 05:59:18 PM »

I picked up an IC-718 for times when I want to go portable, but for now I will use it in the shack along with my TS-940.

Here's what's puzzling me. It seems that the IC-718 has an "oversensitive" ALC.
I like to keep the ALC set on the amp around 150MA and this works just fine when driving it with the TS-940 at 70W.

When I switch to the IC-718, it pegs the meter (ALC on the 718) and it (718) cuts back. I'm using the same drive power of 70W.
In order to keep the ALC on the radio in check, I need to set the amps ALC limit to 300ma, which completely defeats the purpose at that point.
So it seems that the ALC feedback in the 718 is just too sensitive...

Has anyone seen the same issue? What has been the cure..

73

Bart
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KB8BAB
Member

Posts: 101




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« Reply #1 on: December 21, 2012, 06:27:35 PM »

Looks like I found the issue.
The IC-718 has -4 to 0 ALC input, the TS-940 -10.
Looks like I'll need to add a voltage divider in the ALC signal to the IC-718.

73

Bart
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KB5UBI
Member

Posts: 97




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« Reply #2 on: December 21, 2012, 11:36:35 PM »

Looks like I found the issue.
The IC-718 has -4 to 0 ALC input, the TS-940 -10.
Looks like I'll need to add a voltage divider in the ALC signal to the IC-718.

73

Bart

There is a ALC voltage adjustment on the back of the AL-80B so there is no need for a voltage divider.
KB5UBI
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KB8BAB
Member

Posts: 101




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« Reply #3 on: December 22, 2012, 07:51:27 AM »

True, there is a voltage adjustment on the back of the amp.
But if I set it to work with the IC-718, then it will not work correctly with the TS-940, hence the idea of the voltage divider.

73
Bart
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