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24.150.11.85
What is the difference here.There are many models of these units
with no real explanation of the units.One of the Polyphaser units
claims it is dc blocked at the center conducter as well as dc blocked
at the coaxial shield to protect equipment.Others mention protection
from static and others make no mention of static protection.A few models mention special circuitry to drain static that is below the
gas tube voltage required for the tube to activate.Anyone care to tackle this subject.What is the best type to by.
Follow Ups:
a couple or three torch bulbs in series? yep?Do find a copy of
'Joe Carr's Receiving Antenna Handbook'
Ah cain't always be rahnd here.
A gaseous 3terminal kills all static on my AM 'random' 70ft wire.
Earthed? lightning, RF and small signal returns?
and it's got a 'low-noise down lead' and all, too, see?!!!
{;-)}
WarmestTimbo in Oz
The Skyptical Mensurer and Audio Scrounger'Still not saluting.'
Read about and view system at:
As for DC blocks, many mast mounted and inline amplifiers or down converters use the downlead to provide B+ (DC power) thus using the same cable for both signal and power supply. You don't want DC at the antenna input so a DC block is used. It's usually just a series capacitor or in the case of center conductor and shield two series capacitors, one on each.
{;~)}NB A cap like that is gonna need to be pretty 'sturdy' for static charges.
if you can light a torch bulb, or two, which will, also, kill it.
WarmestTimbo in Oz
The Skyptical Mensurer and Audio Scrounger'Still not saluting.'
Read about and view system at:
the flickering. But I found the three terminal gaseous arrestor works just as well.
WarmestTimbo in Oz
The Skyptical Mensurer and Audio Scrounger'Still not saluting.'
Read about and view system at:
The cap won't address the static issue. Just block DC.
This probably isn't pertinent but I remember there being little "lightning arrestor" blocks available for both 300 ohm twinlead and larger coaxial cable which consisted of nothing more than a spark gap(s) - never read anything on their efficacy however. If it's that kind of protection you are looking for you might be able to build something into an "F" connector with sharpened pins of some sort; and of course grounding the shell.
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