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
> -----Original Message-----
> From: towertalk-bounces@contesting.com [mailto:towertalk-
> bounces@contesting.com] On Behalf Of Steve Norris
> Sent: Thursday, September 10, 2009 9:36 AM
> To: towertalk@contesting.com
> Subject: [TowerTalk] Question on Lightning Protection Devices,
> Polyphaser,etc.
>
> Have two general questions/assumptions on use of polyphaser devices at
> frequencies OTHER than the design bands.
>
> (1) I would assume that a unit's inherent lightning protection for the
> coax
> run would be "intact", regardless of the frequency design of a device. It
> just wouldn't necessarily be useable for transmitting or receiving at none
> design frequencies. That being said:
>
> (2) I would also assume that a device designed for HF frequencies WOULD
> NOT
> be useable for higher bands VHF/UHF/SHF frequencies. I wouldn't try that.
> However, I have no idea whether units designed for the higher frequencies
> (i.e. cellular bands at 800mhz and up), could safely be used on "lower"
> frequency HF/VHF bands. The reason for the questions is the cheap
> availability of some "very robust commercial devices (Polyphaser) removed
> from cellular service.
>
> I would STILL use devices at the house/shack entry that are designed for
> the
> correct bands. But, I was hoping to add some of these bulkhead polyphaser
> units at the tower/antennas, for additional protection. Comments?
>
> Steve, W5KI
>
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