---- Eric Lemmon <[EMAIL PROTECTED]> wrote:
> I know that Polyphaser is a popular name in "lightning arrestors" but I
> wondered why I never saw that brand being used at a cellular telephone site.
I've been working cellular (and paging) for about 20 years now and the P brand
seems to be the most common one used here in the Northeast on 800-900Mhz
systems. It's probably a cost issue, as the P brand is definitely cheaper. It
also could be that the P brand does a very good job overall of protecting the
equipment and Huber+Suhner might be considered a little overkill for this
region of the USA. I have seen very little lightning damage done to equipment
due to antenna hits. Most lightning damage seems to come in on the AC
powerline or telephone circuits. I am not arguing that Suhner Huber is not a
good product, in fact it is. The return on investment may not be there for our
application.
> The H+S unit was waterproof while the P unit was not;
The sites that I have worked on have the arrestor mounted inside the shelter at
the access port, so this is not an issue for us.
> The real difference was in RF performance: the
> H+S unit had no impedance bump when tested on a network analyzer while the P
> unit had a prominent bump. And I can see why- the P unit has an
> asymmetrical jumper inside the case. Since cellular telephone systems
> operate generally in either the 880 MHz band or the 1900 MHz band, any
> impedance discontinuity can have significant and detrimental effects.
I never swept an H+S device, but the Polyphaser usually sweeps around -30dB on
our systems. This is not enough to concern us at 800Mhz.
Huber+Suhner is probably the Mercedes Benz of arrestors, but the Polyphaser
still does a very adequate job at a much lower cost.
73, Joe, K1ike
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/Repeater-Builder/
<*> To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
