Topband: I.C.E. lightning protective device

[Harold Smith]

Subject: Topband: I.C.E. lightning protective device


> As a follow up to the recent discussion of the capacitance value in 
> Polyphaser HF protective devices (two each .01 uFd/500v in parallel), I 
> made a technical query with I.C.E. as to the capacitance in their 303U HF 
> 8Kw device (the next smallest device is only 1KW).  I.C.E. responded today 
> saying that their device is basically "a wide-range blocking capacitor 
> bank, 13,600 pf, or .0135 micro-farads, 3KV rated."
>
> 73. . .Dave
> W0FLS


Dave,

I did some measurements on the I.C.E model 305, 15KW unit.
With a 51 ohm resistor at the antenna connection, I measured with the MFJ 
259B analyzer
an Impedance of 52 ohms and the reactance was 0 (zero) ohms up to 6.8 MHz. 
Above 6.8 MHz
the impedance stayed the same and the reactance varied from 2 to 4 ohms..
The series capacitance measures 0.0127 mfd. There are three disk ceramics in 
parallel. From their size,
I would guess that each capacitor is a 0.005 @ 6kV. The total value would be 
within their normal
tolerance.

Perhaps this information is usable to someone.

73...Price W0RI