Gary, my apologies, I stand corrected. I had a "slip" in my old brain's
thought process. I was thinking about Poly P's introduction of the GT
series (Gas Tube) that, as I noted, was a less expensive version that they
introduced around 1-1.5 years ago ( i think that is close, even though their
spec dwgs are dated around 2 years ago). They list for $ 45 vs. the typical
IS series around $ 65. My mistake despite writing about their Gas Tube
products years ago. Too bad I can't upgrade a chip in my skull !!
73, Steve, K1PEK
DAVIS RF Co., Div of Orion Wire Co., Inc.
>
> Message: 4
> Date: Fri, 11 Sep 2009 16:57:11 -0500
> From: "Gary Schafer" <garyschafer@comcast.net>
> Subject: > To: "'Steve Davis -Davis RF Co.'" <sdavis@davisrf.com>,
> <towertalk@contesting.com>
> Message-ID: <92B4AD15AB4B401387132BAA16BDF6D2@YOURC36DD1B81E>
> Content-Type: text/plain; charset="US-ASCII"
>
> Polyphaser has used gas tubes in their coax protection devices from day
> one.
>
> The reason for the series capacitor is to allow the gas tube to fire
> before
> enough energy is passed into the circuit following the protector. If there
> was no capacitor and the radio or cavity following the protector had a
> coil
> in its circuit that provided a DC ground then the gas tube would not fire
> until a large amount of energy passed into the coil and into the radio
> etc.
>
> 73
> Gary K4FMX
>
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