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Re: LF: Re: Low loss inductors

To: [email protected]
Subject: Re: LF: Re: Low loss inductors
From: "Rik Strobbe" <[email protected]>
Date: Mon, 28 Feb 2000 17:14:16
In-reply-to: <[email protected]>
Reply-to: [email protected]
Sender: <[email protected]>
The inductance of a coax 'stub' is frequency dependent !
According to the formula for a loss-less cable (given in an earlier mail,
should be OK for 136kHz) 70m of RG58 cable should be about 17uH. For higher
frequency this value will increase, until it reaches 'endless' for a
quarter-wave stub (at +/- 700kHz).
Based on a value for 37uH the frequency used to measure should be arround
550kHz.

73, Rik  ON7YD

At 09:34 28/02/00 EST, you wrote:
In a message dated 2/27/00 9:10:10 GMT Daylight Time, [email protected] writes:
<< Does any reader have a drum of coaxial cable and a low frequency bridge
test set?  A practical measurement should sort out a quantitative
result. >>

Not a test set for measuring at 136k. But abt 70m of RG58 on drum measures:

With short at far end -  37.16uH
With open cct at far end 6.265nF.

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