Appendix B

Technical Formulas


Combining consists of summing multiple channels together to feed onto a common table. Low frequencies and higher frequencies will in time reach a peak voltage together of the same polarity. This voltage summation peak can have more peak power than the sum of their RMS powers. Since gas tube protectors are voltage sensitive, they must be designed to handle combiner outputs or turn-on RF voltage peaks can result. This can cause major problems at other frequencies (VT that it can handle without RF turn-on. This total is the summation of all the voltage peaks for each channel being combined.
VSWR X =
1.1 to 1 1.05
1.2 to 1 1.09
1.3 to 1 1.13
1.4 to 1 1.17
1.5 to 1 1.2
1.86 to 1 1.3


CALCULATING INDUCTANCE:

Copper Wire:

L(in µH) = 0.508 l [2.303 log10 (4 l/d)-0.75] x 10-2

Copper Strap:

L(in µH) = 0.508 l [2.303 log10 (2 l/w+t)) + 0.5 + 0.2235 (w+t)/ l] x 10-2

Where: l = length in inches
d = diameter in inches
w = width in inches
t = thickness in inches

IS-158E & 318E HIGH POWER GAS TUBE SELECTION:

VT = VP1 + VP2 + VP3 ... + VPn

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