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 How to adjust

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jerryhawthorne



Posts : 10
Join date : 2010-10-13

PostSubject: How to adjust   Thu Oct 21, 2010 6:08 pm

Working on a Scot Metro and the adjustment to align at 1500KC involves a air variable cap and two of the types shown in the picture. Now idea how to adjust, frequency is on by the air cap, but lots of background noise that shouldn't be there on a 1600KC local station. Figure I need to adjust the two trimmers, one of which is shown on the attached pic (hopefully attached). It has a course screw sticking out of the top, with a pointed tip. No idea how to "adjust" it. Any ideas out there?

Jerry


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jack shirley



Posts : 67
Join date : 2010-10-12
Location : SE USA

PostSubject: Re: How to adjust   Thu Oct 21, 2010 6:37 pm

EDIT: {DELETE} incorrect answer! Thanks, majoco


Last edited by jack shirley on Fri Oct 22, 2010 7:27 am; edited 1 time in total
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jerryhawthorne



Posts : 10
Join date : 2010-10-13

PostSubject: Re: How to adjust   Thu Oct 21, 2010 8:45 pm

Thanks Jack, it took that to give me enough confidence to try tuning a little harder, yep, the whole can turns nicely after breaking it loose a little.

Jerry
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josephars



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Join date : 2010-10-13

PostSubject: The shaft should not turn. Please do not touch it. It is permanently attached /glued/ to the stator /the bottom part/. Adjust turning only the rotor /the top can/.   Thu Oct 21, 2010 9:35 pm

jerryhawthorne wrote:
Thanks Jack, it took that to give me enough confidence to try tuning a little harder, yep, the whole can turns nicely after breaking it loose a little.

Jerry
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majoco



Posts : 7
Join date : 2010-10-12

PostSubject: Re: How to adjust   Thu Oct 21, 2010 9:40 pm

NO NO - the screwed shaft will NOT turn!

Mainly seen in UK and Philips radios, they are called beehive trimmers. The threaded rod in the centre is fixed to the bottom piece and the top with the roughly triangular plate and the three rivet heads rotates around the threaded shaft - the trimming tool is a plastic rod with a bell end that has three slots in it to engage with the three rivet heads.

If you turn the 'outer' top bit anticlockwise it will rise up the threaded rod and reduce the capacitance - if you take it right off you will see concentric rings on both the top and the base - they mesh just like a normal tuning cap.
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