[Heathkit] IM-2420 Freq Counter problem

[Bill Cromwell]

Hi Sandy,

It sure sounds like one of the digital chips has turned south. Is this 
counter built with LSI or does it have a separate IC for each decade? 
Probably more than one for each decade? Is there a range switch? Does it 
work okay on other ranges or is that digit always by the same amount? I 
don't think your clock oscillator being off a little will cause this 
problem.

Check for bad solder joints and/or solder bridges in among the forest of 
pins. If the ICs are socketed try rocking them in their sockets to clear 
oxidation.

73,

Bill  KU8H

On 09/25/2014 05:41 PM, Alexander N. Gerli wrote:
> Hi, gang!
>
> I'm trying to figure out something. My counter does count, but one digit's
> way off - the x10MHz. For instance, if I key up my HT nearby on 146.34/94,
> the counter displays "106.3400" Off by 40MHz. Now, I can't find any such
> anomaly covered in the "ICOD" section of the Manual (naturally...). I'm
> figuring that I need to recalibrate the 10mHz Oscillator inside its
> styrofoam oven. I have another portable counter I can use and it is right
> on. But if it were off by that much, how come the suffix reading of .340mHz
> comes out on the nose? Anybody have any suggestions? Maybe a divider chip
> could be off, but I have NO idea which one. I guess I could reseat all the
> chips  in their sockets?
>
> ​73,​
>
>
> ​Sandy AC1Y​
>
>
> Alexander N. Gerli, Sr.
> 548 Allred Mill Road
> Mount Airy, NC 27030-2202
>
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