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
> -----Original Message-----
> From: towertalk-bounces@contesting.com [mailto:towertalk-
> bounces@contesting.com] On Behalf Of Steve Davis -Davis RF Co.
> Sent: Friday, September 11, 2009 12:12 PM
> To: towertalk@contesting.com
> Subject: Re: [TowerTalk] LightningProtectionDevicesPolyP,Response DAVIS RF
> Co.
>
> Hi Steve,
>
> Polyphaser's various types of lightning/surge in-coax line devices
> , in part, incorporate a filter circuit .
> These circuits are freqcy sensitive thus using an outside spec freqcy
> application will introduce problematic attenuation to receive signals.
> A ref. was made to "gas tube", I believe in same context with PolyP.
> It
> is only recently that Poly P introduced a gas tube type, which is a slower
> response time, albeit high current ability ( 50 KA). They stayed away
> from
> these for quite some time due to the superiority of their diode and
> MOSFET,
> patented devices. But, IMHO they went to gas tubeause there was a proven
> market for it,
> less expensive (but what is $ 30 or so more to ultimately protect your
> cable, your equipment, your wife , kids and the dog (my friend lost his
> house and dog, now uses PolyPhaser).
> We discount PolyPhaser. Any questions feel free anytime to contact me.
>
> 73, Steve , K1PEK,
>
> DAVIS RF Co., Div. of Orion Wire Co., Inc.
>
> Wire, Cable, RF Connectors and wire aerial parts. LMR, Heliax, Eupen
>
> Commercial / Military / & Custom Cable Design
>
> tel: 978-369-1738 Fax: 978-369-3484
> www.DavisRF.com
>
>
>
> Message: 6
> Date: Fri, 11 Sep 2009 09:09:01 -0500
> From: "Steve Norris" <w5ki@aol.com>
> Subject: Re: [TowerTalk] Question on Lightning Protection Devices,
> Polyphaser, etc.
> To: <towertalk@contesting.com>
> Message-ID: <EB8B161717CC46B28D5E23D622CD4A62@hamradio>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> Thanks to inputs from Gary and Stan (and any future). Both replies made
> immediate sense to this older brain. Seeing the size of series
> capacitance
> in remote antenna switches to handle a KW on HF, I could relate.
> Steve, W5KI
>
> ----- Original Message -----
> From: "Gary Schafer" <garyschafer@comcast.net>
> Subject: RE: [TowerTalk] Question on Lightning Protection Devices,
> Polyphaser,etc.
>
>
> > Probably not usable out of the design range. The Polyphaser devices have
> a
> > series capacitor in them. On UHF it is a rather small capacitor and I
> > don't
> > think it is large enough for HF to pass.
> >
> > The higher the frequency the lower the power rating on them also.
> > Different
> > gas tubes for different frequency ranges.
> >
> > 73
> > Gary K4FMX
>
> >> From: W5KI
> >> Subject: Question on Lightning Protection Devices, Polyphaser,etc.
> >>
> >> Have two general questions/assumptions on use of polyphaser devices at
> >> frequencies OTHER than the design bands. ...
> >>
> >> Steve, W5KI
> >>
> >> _______________________________________________
>
>
>
> ------------------------------
>
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>
>
>
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