[Lowfer] Measuring inductors

[rick kirby]

Thanks John,
 That's a nice old boatanchor looking piece of gear!! It will fit in well in
my shack I will keep my eyes open for one .Im already planning for next
years "lowfer" season . Im building up a new class E xmtr and want to try my
hand at a vertical 
Instead of the loop. I was trying to wind my new tank coil and wasn't happy
with my little test oscillator.That bridge will come in handy for my loading
coil and antenna when I get to it.

   Thanks Again !

         Rick  "PBO"
 



-----Original Message-----
From: lowfer-bounces at mailman.qth.net [mailto:lowfer-bounces at mailman.qth.net]
On Behalf Of John Andrews
Sent: Wednesday, March 09, 2011 02:50
To: Discussion of the Lowfer (US, European, & UK) and MedFer bands
Subject: Re: [Lowfer] Measuring inductors


Rick,

Inductors are best measured at the frequency at which they will be used. 
The old Boonton Q Meters do this well. But an RF impedance bridge will 
allow very accurate measurements on coils, capacitors, antennas, etc. 
Here's a picture of my old friend, the General Radio 516C:
http://www.w1tag.com/files/GR516C.jpg

The GR RF bridges turn up occasionally on eBay, but not all are suitable 
for LF work. The 516C and 916AL are two to look for, but they are the 
least common. Note that the common GR 650 and 1650 bridges are for audio 
frequency use.

John, W1TAG

On 3/8/2011 8:28 PM, rick kirby wrote:
> Hi All,
>
>   Im looking for suggestions for accurately measuring ferrite and iron 
> torroids. I have been using a simple oscillator setup with a frequency 
> counter and a calculator.It has worked so-so with iron core coils but 
> with ferrite cores and inductances up in the hundreds of microhenries; 
> its  all over the place.Maybe core saturation or something ; Im not 
> sure. I have a scope ,counter, DMM and a cheesy little signal 
> generator to work with.I have heard mixed reviews on the commercial 
> meters; the chief complaint being they test the inductors at an audio 
> frequency.I built an  adapter for the multimeter using a 74hc132 or 
> something like that  and wasnt happy with that either. So what is 
> everyone else using??
>
>                Thanks
>                          Rick  KA2PBO 
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