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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=[email protected]> 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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