[Lowfer] Measuring inductors

[Paul Daulton]

Niether of my Qmeters came with a standard coil. My Boonton 260 , which 
was a gift, had a bad tube in the rf
vtvm circuit. I found one on ebay for $30.00. but unit is not 
calibrated. There are several articles on the internet about replacing 
the bolometer with a thermouple from ARC-5 tuning unit. Back in 65 I 
worked in the QC engineering dept of a TV manufacturer and one of my 
responsibilities was taking care of the 260 in our coil dept. A 
careless operator went to break and left the 260 on and it creeped up 
and burned out the bolometer. Cost then was over $900 for a 
replacement. Doubt if one could be found today unless it is in a junk 
machine. As is it is still a fine instrument for comparisons. Heath 
unit gives almost identical readings, so that is what I use most of the 
time. 

I have thought of making a coil or two with B&W minductor stock and 
mounting on a piece of bakelite and finding someone with a calibrated 
unit and mailing mine to them for measurement so I would have a known 
reference. 

This months QST has a note in the 25 years ago collum about an article 
by W1FB in  April 1986 qst about measureing inductance and Q. Check 
that out in the archives on ARRL site. 

Paul k5wms

Quoting John Rabson <john.rabson at numeo.fr>:
> > My QM (bought at a junk sale in the UK) came with a standard coil also. 
>
> 73
> John F5VLF/G3PAI
>
>
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Paul Daulton K5WMS
beacon WMS 185.302 khz qrss30/slow 24/7
Jacksonville,Ar 72076
em34wu