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Adjusting Ameritron AL-82 input coils

 

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I have an older AL-82 that works fine except the input SWR is right around 2:1 on 20m and it's just high enough to cause the K3 that I am driving it with to start to foldback so that the output power is 1200w max. Not that another couple hundred watts will really make a difference, but I thought I would try and adjust the input match coil slug on 20m.

This older unit has what kind of looks like a cap on the coils. It has a flat blade screwdriver slot and also a larger hole in the center that looks like a hex tool would fit into. However, when trying even a larger hex tool through it, no less the plastic tuning tool I bought from DX Eng, of course with the unit off and discharged, it appears there isn't a tuning slug inside? Is the outside cap meant to rotate?

I also have a much newer AL-82, and it doesn't have these "covers" on the coils and I can clearly see a tuning slug inside each coil.

It looks like a job to get to this box to see the inside. Has anyone experienced adjusting the tuned inputs on an older AL-82?

TU;
Steve
NY3A


_._,_._,_
 

There ?are no??adjustable caps, only the slugs are adjustable. ?If you don’t feel the slug someone could have ran it all the way in and if fell out of the slug. ?




On Monday, June 17, 2024, 12:23 AM, Steve Sluz <ny3a@...> wrote:

I have an older AL-82 that works fine except the input SWR is right around 2:1 on 20m and it's just high enough to cause the K3 that I am driving it with to start to foldback so that the output power is 1200w max. Not that another couple hundred watts will really make a difference, but I thought I would try and adjust the input match coil slug on 20m.

This older unit has what kind of looks like a cap on the coils. It has a flat blade screwdriver slot and also a larger hole in the center that looks like a hex tool would fit into. However, when trying even a larger hex tool through it, no less the plastic tuning tool I bought from DX Eng, of course with the unit off and discharged, it appears there isn't a tuning slug inside? Is the outside cap meant to rotate?

I also have a much newer AL-82, and it doesn't have these "covers" on the coils and I can clearly see a tuning slug inside each coil.

It looks like a job to get to this box to see the inside. Has anyone experienced adjusting the tuned inputs on an older AL-82?

TU;
Steve
NY3A
 

Do all the coils look the same or is the 20 meter coil different?
Bob W4JFA

On Mon, Jun 17, 2024 at 5:36?AM Louis Parascondola via <Gudguyham=aol.com@groups.io> wrote:
There ?are no??adjustable caps, only the slugs are adjustable.? If you don’t feel the slug someone could have ran it all the way in and if fell out of the slug. ?




On Monday, June 17, 2024, 12:23 AM, Steve Sluz <ny3a@...> wrote:

I have an older AL-82 that works fine except the input SWR is right around 2:1 on 20m and it's just high enough to cause the K3 that I am driving it with to start to foldback so that the output power is 1200w max. Not that another couple hundred watts will really make a difference, but I thought I would try and adjust the input match coil slug on 20m.

This older unit has what kind of looks like a cap on the coils. It has a flat blade screwdriver slot and also a larger hole in the center that looks like a hex tool would fit into. However, when trying even a larger hex tool through it, no less the plastic tuning tool I bought from DX Eng, of course with the unit off and discharged, it appears there isn't a tuning slug inside? Is the outside cap meant to rotate?

I also have a much newer AL-82, and it doesn't have these "covers" on the coils and I can clearly see a tuning slug inside each coil.

It looks like a job to get to this box to see the inside. Has anyone experienced adjusting the tuned inputs on an older AL-82?

TU;
Steve
NY3A
 

Thanks for the help everyone. Turns out there was a coil slug in the 20m coil. I was able to adjust it and now full power out on 20m.

73;
Steve
NY3A

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