[R-390] Measuring Resistance Values

[Les Locklear]

I "kinda" remember 20,000ohms/volt as being the "standard" for those days. But at my age, my kinda and facts might be off...
 
Les


----- Original Message -----
From: Barry <n4buq at knology.net>
To: R-390 Mailing List <r-390 at mailman.qth.net>
Sent: 9/2/2024 9:31:15 AM
Subject: [R-390] Measuring Resistance Values
________________________________________________________________________________

> Did Collins specify what input impedance a meter should be to properly read the 
> resistance values in the manuals?  I did see where a TS-352 was mentioned but 
> that's selectable between 20,000 ohms/volt and 1,000 ohms/volt.
> 
> I started checking the RF Deck in my R-390 and, starting with V201, I noted a 
> few values that are significantly high.  I was using a modern DMM with 10M 
> input impedance so not sure if that could be the problem but I doubt it would 
> account for that much difference but who knows.
> 
> The voltages were off a bit as well but not nearly as much as the resistance 
> values.  I suspect the radio will still work with wacky voltages but the R 
> values really have me thinking I have work to do.
> 
> Thanks,
> Barry - N4BUQ
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