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 turnon RF voltage peaks can result. This can cause major problems at other frequencies (V_{T} that it can handle without RF turnon.
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 log_{10} (4
l/d)0.75] x 10^{2}
Copper Strap:
L(in µH) = 0.508
l [2.303 log_{10} (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
IS158E & 318E HIGH POWER GAS TUBE SELECTION:
V_{T} = V_{P1} + V_{P2} + V_{P3} ... + V_{Pn}
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