[ARC5] 10 meter BC-454 - instability possibly found.

[brianclarke01 at optusnet.com.au]

	Hello Ken, 

	I'm really enjoying your saga. I have hidden agenda -  I have a
similar chassis that will benefit from your experimentation. 

	In your HF osc coil, a rubber band is likely to perish. Try BluTak
instead. 

	73 de Brian, VK2GCE 

----- Original Message -----
 From:"Ken Gordon" 
To:"ARC-5 List" 
Cc:
Sent:Tue, 12 Feb 2013 23:59:14 -0000
Subject:[ARC5] 10 meter BC-454 - instability possibly found.

First of all, I must commend Mike's coil dope formula: it is very
excellent stuff. I painted a 
layer of it on the HFO coil and it hardened to a very clear, thik
coating that looks and feels 
very solid.

However, that wasn't the most important discovery I made today: the
slug in the oscillator coil 
is loose as a goose. It literally wobbles around on its threaded
shaft. Clearly, the least 
movement of the receiver would cause the slug to move, thereby
changing the frequency to 
which it is tuned.

I haven't yet decided how I am going to tighten it without simply
gluing it in place.

It took 14 complete turns to remove it, BTW.

I am thinking about attempting to embed a bit of rubber-band in the
threads, or 
beeswax...maybe I can let a drop of Super Glue, or a very thin layer
of it, harden on the 
threads, after which I can re-install the slug by putting a drop of
Acetone inside the slug and 
screwing it on quickly.

Suggestions cheerfully accepted.

Ken W7EKB
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