Polyphasers block DC and have pre-determined frequency and RF power level.
Once exceeded, the Polyphaser shorts all energy to ground. The response time
is ~10 nanoseconds. A person can not blink that fast :}
Gas discharge units pass DC and can allow dangerous energy past the discharge
tube.
For folks that need to send a DC signal to a radio tower device, a separate
control cable is used.
A Bias Tee device inserts / removes a DC signal from a feedline. This Bias
Tee device also creates an impedance bump (seen by an IFR oscilloscope) =
signal loss. Hence, I do not use them, use a separate control cable as needed.
Thanks n 73,JamesKI5DQ On Monday, December 15, 2025 at 09:06:16 PM CST,
[email protected] <[email protected]> wrote:
That's a good point, Ron. I am not sure if there is even a static discharge
with the GDT. The Polyphaser coax protectors are in a nice easy to mount
enclosure and not terribly expensive but I have not used them in 20 years.
John
Ron WV4P wrote:
" Once again, most commercial sites use Polyphaser lightning
suppression They provide maximum protection, when compared to other
manufactures.
Thanks and 73,James KI5DQ"
Compared to what manufacturers ? What Data ? Please back up these claims of
"Maximum Protection" when it's just a GDT.
Ron, WV4P
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