[Hammarlund] Unstable Oscillator adjustments in the HQ-180

[Roger D Johnson]

I can't remember if the Hammarlund receivers have a hex core tuning slug or a
screwdriver slot. I think it's hex.

One thing that can cause tuning flakiness is a piece of slug broken off and rattling
around in the can.

73, Roger


On 2/12/2016 2:22 PM, Richard Knoppow wrote:
>    At one time I had a long ceramic adjustment tool with slot screwdriver 
> ends. I may still have it but it disappeared after moving some stuff to 
> storage.  It was very useful. For one thing it would reach into equipment that 
> nothing else was quite satisfactory for such as my General Radio 1001 signal 
> generator. If the tip broke I could grind it back to shape just as with a 
> metal screwdriver.  It was also non-reactive, i.e., could be used to adjust 
> oscillators, etc, without pulling the frequency.
>
> On 2/12/2016 8:59 AM, k2cby wrote:
>> The best investment I ever made was a set of ceramic screwdrivers. They are
>> a Japanese import, and you can find them on eBay. There are two downsides:
>> (1) The blades are small and spec'd in mm - read carefully before you buy;
>> and (2) the blades are very short - 1-1/2 inches or so (but you might be
>> able to cur away the handle and attach the blade to a longer shaft).  The
>> good thing is that the ceramic blades are very strong, don't chip or break,
>> and are of course completely transparent to electrical and magnetic fields.
>>
>>
>> Miles B. Anderson, K2CBY
>> 16 Round Pond Ln.
>> Sag Harbor, NY 11963
>>
>> k2cby at optonline.net
>>
>>
>>
>>
>>
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>