[Boatanchors] HRO 50 / 60 coil alignment jig

Mon, 22 Mar 2004 06:10:39 -0600

The 60s have access holes in the top and rear of the coil catacomb as 
well; I was trying to come up with a jig to permit better access to the 
inductance adjustments in the rear of the coils, and also permit doing 
this without opening up the receiver and standing it on its side.

Stray capacitance is of course the real problem to overcome here. 
Wonder how the elves at National did it?

Maybe it's not a big deal.  How often does one have to do this?  Not 
very often, I'm guessing.

regards,

Mahlon - K4OQ

Dee C. Almquist wrote:

> Just a comment from Dee's lab. My HRO-50 has access holes to adjust the
> coils. I dont remember if they are accessed from top or bottom of chassis,
> but they are there.
> 73 es Dee
> 
> ----- Original Message -----
> From: "Al Klase" <[email protected]>
> To: <[email protected]>
> Cc: <[email protected]>
> Sent: Sunday, March 21, 2004 5:49 PM
> Subject: Re: [Boatanchors] HRO 50 / 60 coil alignment jig
> 
> 
> 
>>Mahlon Haunschild wrote:
>>
>>
>>>...I'm considering gutting the
>>>innards and the coil to make a coil extender/jig of some sort to
>>>facilitate alignment of HRO 50 / 60 coils outside of the receiver...
>>
>>I suspect an extender isn't going to do the job because of
>>the extra capacitance (and inductance) involved.  A cut-away
>>receiver might be just the ticket though.
>>
>>Al
>>
>>--
>>Al Klase - N3FRQ
>>[email protected]
>>Flemington, NJ 08822
>>Web Page:  http://www.webex.net/~skywaves/home.htm