Re: [IRCA] More phaser musings

[Barry McLarnon <bdm@xxxxxxxxxx>]

On Saturday 28 October 2006 04:46, Bill Harms wrote:
>         Fine tuning pots could be one solution I suppose.  I have never
> tried them.  On my Quantum phaser, I retro-fitted two 6-to-1 Vernier
> Reduction Drives. I also installed one on my K9AY indoor control
> unit. This gives me fine control.  The biggest issue is that you have
> to engineer a way to mount them. I might write a mini-article to
> describe how I did it if there is enough interest.

It's a matter of taste, I guess, but I like the fine tuning pot approach.  I 
recently found a 10-turn "Helipot" in the junk box, so I added it to my 
MFJ-1026 as a fine phasing adjustment (in place of the unneeded "T/R Delay" 
pot).  The old phasing pot is still there, so it can be used as a coarse 
adjustment to rapidly find the vicinity of the null, and then the fine tuning 
pot is used to tweak it.  I decided that the gain pots didn't need fine 
tuning, but I replaced the originals with higher quality units, and installed 
larger knobs.

Barry

-- 
Barry McLarnon  VE3JF  Ottawa, ON

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