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Scanner / Receiver Antennas For discussion of any type of receiving antenna used by a scanner or receiver base, mobile or handheld.

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Old 05-07-2008, 10:14 AM
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Default PolyPhaser Frequency Ranges

I've been very loosely shopping some PolyPhaser units for lightning protection on a new antenna setup I've been planning. My confusion is relative to the frequency ranges they publish. For example they have a unit rated from 800Mhz to 2.2Ghz...What exactly does this mean? Should I assume that since I'm listening to quite a bit of traffic below 800Mhz, this unit would not be usable?
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Old 05-07-2008, 10:20 AM
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Quote:
Originally Posted by fuzzymoto
For example they have a unit rated from 800Mhz to 2.2Ghz...What exactly does this mean? Should I assume that since I'm listening to quite a bit of traffic below 800Mhz, this unit would not be usable?
That's exactly what that means.
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Old 05-07-2008, 1:31 PM
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But they don't appear to make any wide-range models lik ethe typical 25-1300Mhz...so how do you preotest an antenna/scanner that you're using a wider range?
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Old 05-07-2008, 7:51 PM
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These ones cover that range. They are really cheap, I'm not sure if that means they are lower quality.

These ones might not be bad either.

Last edited by mrsvensven; 05-07-2008 at 8:01 PM..
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Old 05-07-2008, 8:16 PM
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Quote:
Originally Posted by fuzzymoto
But they don't appear to make any wide-range models lik ethe typical 25-1300Mhz...so how do you preotest an antenna/scanner that you're using a wider range?
You look a little deeper into their catalog and find one what will work. They have some that will cover the range you're interested in and then some. Try looking under amateur products on their web page.
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Old 05-07-2008, 9:01 PM
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Your wasting your time and money, Just ground the equipment and the antenna structure.

Grounding rods are cheap and all you need to do is ground the antenna and ground your equipment, it's very very basic.

Put it in the ground DEEP and your done, No need for equipment to achieve such a simple thing such as grounding.
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Old 05-07-2008, 9:19 PM
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Then why does every cellular network in the country use these?
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Old 05-07-2008, 11:01 PM
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Grounding an antenna and preventing damage from a lightning hit are two completely different topics. Designing and building an antenna system from the ground up (pun intended) with good quality lightning arrestors like Polyphaser can survive a direct hit, but its probably beyond the scope of the average ham or scanner person due to constraints in the existing home or building infrastructure.
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Then why does every cellular network in the country use these?
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Old 05-07-2008, 11:22 PM
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Nothing wrong with grounding your antenna structure and antenna. The purpose of using the polyphaser is to protect your equip via the coax ( center conductor and shield ) should your antenna take a hit.
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Old 05-08-2008, 12:15 AM
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Quote:
Originally Posted by digitalanalog
Your wasting your time and money, Just ground the equipment and the antenna structure.

Grounding rods are cheap and all you need to do is ground the antenna and ground your equipment, it's very very basic.

Put it in the ground DEEP and your done, No need for equipment to achieve such a simple thing such as grounding.
You apparently don't understand the purpose of these lightning suppressors. The idea is to shunt the pulse on the center conductor of the coax to ground without adversly impacting RF performance. Merely grounding the antenna structure won't do this. A lightning suppressor is just one of many steps one does to protect agaainst lightning. It's useless without taking the steps you mentioned. The steps you mentioned are useless without a suppressor. And so it goes...
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Old 05-08-2008, 3:23 AM
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I stand Corrected.
Thanks
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Old 05-08-2008, 8:11 AM
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Thanks guys. I really wasn't trying to kick of fthe grounding debate. I currently run both a ground of the mast and a grounding block of the coax. I also did a poll:

http://www.radioreference.com/forums...rounding+block

To see who is and is not using a grounding block.

I'm moving to a new office in the next year and I've pre-run LMR-400 to the roof. I'm still debating the final connections (i.e. whether to put a lightning arrestor on the roof or just go with the grounding of the mast). I don't debate the effectiveness of a grounding block and I do dis-connect my equipment, but I DO doubt my ability to make an effective lightning protection setup given my antenna layout).

I'm a little thrown off by the switch from RG-6 with F-type connectors to the LMR-400 with N-type connectors as far as grounding the coax, which is why I've been checking out the Polyphaser and similar devices. I am still debating what to do.
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Old 05-08-2008, 11:19 AM
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Default PolyPhaser Models

I use PolyPhaser IS-50UX-C0 protectors (rated 1.5-400 MHz) for my HF antennas, and IS-50UX-C1 (50-700 MHz) for my VHF/UHF antennas, all through a Harger GBIS18114AE copper entrance ground bar. PolyPhaser also has a 125-1000 MHz model, IS-50NX-C2 for 800 MHz stuff, but with N connectors. The PolyPhasers cost $63-$66 each and the ground bar kit is $40, at Amateur Electronic Supply (800-321-3594 or aesham.com). Works well for me.

MIke
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Old 05-08-2008, 12:12 PM
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New Polyphasers show up on Ebay all the time for $10 or less.
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Originally Posted by Shrike
I use PolyPhaser IS-50UX-C0 protectors (rated 1.5-400 MHz) for my HF antennas, and IS-50UX-C1 (50-700 MHz) for my VHF/UHF antennas, all through a Harger GBIS18114AE copper entrance ground bar. PolyPhaser also has a 125-1000 MHz model, IS-50NX-C2 for 800 MHz stuff, but with N connectors. The PolyPhasers cost $63-$66 each and the ground bar kit is $40, at Amateur Electronic Supply (800-321-3594 or aesham.com). Works well for me.

MIke
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Old 05-08-2008, 12:24 PM
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Yes, but none seem to be a wide enough freq range for what I listen to.
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Old 05-08-2008, 4:46 PM
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Has anyone tried TerraWaves Lightning Arrests? Why are they so much cheaper? $18 & $20 dollars. The cheepest Gas lightning arrestors I found locally were $65. Also I do not see a insertion loss rating in the specs. I'm a bit suspicious but if they work then I'm buying them.
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Old 05-09-2008, 2:43 AM
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Yippee! My Omni X antenna install just got cheaper
I just remembered I had some brand new left over parts from a WiFi install job back in 2004.

Found 2 X 20foot WBC400 cables with N male connectors. 2 N male clamp connectors and a Altenicon Lightning Arrester.

I looked up the specs on the Altenicon and I'm more confident to use them then TerraWaves. The Altenicon has complete specs including Salt, Dust, Vibration... and is RoHS Compliant. It's also a tad cheaper!

I also noticed the Altenicon I have is rated for lower watts then the TerraWaves 250 Watts. less then half the Watts.

I'm guessing the Wattage ratings are for transmit power but would a lower Wattage rating for a 'Receive only' antenna make for tighter protection for the scanner?

Altenicon AL-NFNFB-9 Specs
http://www.hyperlinktech.com/item.aspx?id=1468


-fuzzymoto thanks for starting this thread!
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Last edited by CityLights; 05-09-2008 at 2:46 AM..
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Old 05-09-2008, 10:24 AM
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Quote:
Originally Posted by fuzzymoto
Yes, but none seem to be a wide enough freq range for what I listen to.
Did you look at the Polyphaser web page? I did, and I was able to locate units that covered DC-6 GHz, and DC - 3 GHz with about 30 seconds of looking.
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Old 05-09-2008, 12:39 PM
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Quote:
Originally Posted by zz0468
Did you look at the Polyphaser web page? I did, and I was able to locate units that covered DC-6 GHz, and DC - 3 GHz with about 30 seconds of looking.

Yes I have.....my reply was specifically talking about the PolyPhasers on eBay.
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Old 05-09-2008, 1:05 PM
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Ah, ok. Well, you may have to broaden your search, then. Ebay can be pretty hit and miss if you're looking for a very specific item. What you want exists, and is readily available. You just have to look in the right places. If you're looking for a bargain, keep watching ebay. One may eventually show up.
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