[TMC] GPR-90 455KC IF coil

[Duncan Brown]

Dave,

I was able to repair the coil and finish the alignment.

Thanks for your tip on the alignment tool.  I have always hated lock 
nuts on IF coils (especially on the bottom of the chassis, next to the 
B+ terminals) and your tool would have made things much simpler.  But in 
this case your tool would not have prevented the breaking of the coil 
wire.  The problem I had was that when I went to turn the lock nut, _the 
whole coil rotated_ and I did not realize it in time to prevent the wire 
from breaking.  Next time, I'll check that the big nut that secures the 
coil to the can is tight before attacking the lock nuts!

Have fun,

Duncan
K2OEQ

On 02-Jun-14 11:47, Davewb4--- via TMC wrote:
> Duncan: I was catching up on the TMC files and read your IF can problem. I
> do not have a replacement can but if you find one here is how you adjust
> the can  without breaking it. I worked for TMC in Mamaroneck NY
> in the production test dept and tuned lots of GPR 90's. We used a tool
> that you can make. We took a long handle 1/4 nut driver (Xcelite red handle)
> cut  off the plastic top just where the inside metal tube starts. The tube is
> hollow.  We then took a long  thin flat blade screw driver and inserted it
> down the  tube. We could now place the nut driver over the 1/4 inch nut on
> the can,  holding the IF can lock nut in position. Then inserted the
> screwdriver down the  nut driver shaft to adjust the screw on the IF can. A slight
> twist of the nut  driver loosened the IF can lock nut and we could adjust the
> coil without any  pressure on the can. When aligned a slight turn of the
> lock nut finished the  Adjustment, it  also stopped the screw from moving  when
> you locked  down on the nut preventing the adjustment from changing. I hope
> this  helps.
> Dave Rogers
> WB4CHK
> Plantation FL
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