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G0FTD > COAX 30.12.05 10:49l 15 Lines 587 Bytes #999 (0) @ WW
BID : 0E3208G0FTD
Read: DL1LCA GUEST OE7FMI
Subj: Re: Coax dielectric constant measu
Path: DB0FHN<DB0FOR<DB0SIF<DB0FHK<DB0LJ<DB0RES<DK0WUE<7M3TJZ<KP4IG<VE2PAK<
N1UAN<GB7YKS<GB7SYP<GB7ESX<GB7NNA
Sent: 051230/0919z 76162@GB7NNA.#31.GBR.EU $:0E3208G0FTD [Witham, Esx]NNA V3.1
K0CQ wrote:-
> Its not beyond reason at UHF or VHF to find there is a
> periodicity in the foam leading to different velocities (and
> impedances) in different sections only a foot or two apart. That
> shouldn't happen in quality coax, but consumer grade coax for TV
> may not be quality coax.
A very good point Gerry - one that didn't occur to me either.
One could easily assume that it's safe to make multiple cable lengths
up once an *initial* length was found but the other's may well have
to be individually cut and tested to acheive consistency.
- Andy -
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