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GM7HUD > COAX 19.12.05 11:58l 17 Lines 454 Bytes #999 (0) @ WW
BID : 71303_GB7ESX
Read: GUEST DL1LCA OE7FMI
Subj: re: Dialectric value help
Path: DB0FHN<DB0FOR<DB0SIF<DB0CWS<DB0ZDF<DB0LJ<DB0RES<DK0WUE<7M3TJZ<ZL2BAU<
GB7YKS<GB7PZT<GB7MAX<GB7ESX
Sent: 051219/0819z @:GB7ESX.#31.GBR.EU #:71303 $:71303_GB7ESX [Witham, Esx]NNA
Alex GM0DHZ
said >can anyone tell me the dialectric value of Satellite coax,
Measure it. You know the impedance is 75Ohms, so measure the diameter
of the inner and and outer and put them and the impedance into the formula.
Zo = (138/e^(1/2)*log(D/d)
where D is the inner diameter of the shield, d is diameter of centre
Zo = impedance and e is the dilectric.
>RG 58 is .66.
Do you mean velocity factor though and not dielectric?
73 de Andy GM7HUD
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