| |
G0FTD > COILS 05.09.05 23:24l 38 Lines 1424 Bytes #999 (0) @ WW
BID : 60901_GB7CIP
Read: GUEST DL1LCA OE7FMI
Subj: Re: Pile wound coil problem
Path: DB0FHN<DB0MRW<OK0PKL<OK0PPL<DB0RES<DK0WUE<I0TVL<CX2SA<GB7CIP
Sent: 050905/1954Z @:GB7CIP.#32.GBR.EU #:60901 [Caterham] $:60901_GB7CIP
From: G0FTD@GB7CIP.#32.GBR.EU
To : COILS@WW
>I have now had a chance to discuss Andy's problem with a Professional Radio
>Designer friend of mine who is a Professor of Electronics.
Thanks for making the effort Mel - much appreciated.
>Here's what he said:
>Load the coil at one end with a known value of resistance, NONE INDUCTIVE.
>He suggests 100k ohms but says you could come down as far as 5,000 ohms. He
>reckons this will yield a more stable measurement and that if you still get
>two or more values of measurement, to interpolate between them all and my
>friend claims the result is accurate enough for the even the most stringent
>applications.
I've deliberatly reproduced Mel's advice in case anyone missed the
original and has the same problem.
I've only received Mel's relayed advice in the last few minutes so I can't
claim to have tried it yet but it seems to fit in with some stuff I was
reading earlier about the different ways different measurement bridges
calculate the value of impedance, so I've no doubt it weill work.
I will try the above method asap and let you know the results.
It's also comforting to know that the problem exists otherwise the
solution wouldn't have been known ;-)
>He added, "Don't forget to remove the loading resistor before using."
I like your friends style of humour - please pass him my best wishes.
- Andy (now enjoying 160 & 80m shopping trolley mobile) -
Read previous mail | Read next mail
| |
