AMD Phreak
Premium
join:2003-12-14
| Polyphaser Document - SPD Technologies
See attached document for a bit of information on different SPD devices that was sent to me from Polyphaser. |
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sporkme
drop the crantini and move it, sister
Premium,MVM
join:2000-07-01
Morristown, NJ
 ·Optimum Online
| Here's a PDF for the Word-less. |
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John Galt
Forward, March
Premium
join:2004-09-30
Happy Camp
 ·CenturyLink
| said by sporkme  :Here's a PDF for the Word-less. »www.openoffice.org/
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A is A |
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sporkme
drop the crantini and move it, sister
Premium,MVM
join:2000-07-01
Morristown, NJ
·Optimum Online
| That thing is a bloated turd too.  |
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AMD Phreak
Premium
join:2003-12-14 | reply to AMD Phreak
I was going to convert it with OO.ORG but I didn't have it on my laptop, which is where I was when I posted here.
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superdog
I Need A Drink
Premium,MVM
join:2001-07-13
Lebanon, PA
| reply to sporkme
said by sporkme :That thing is a bloated turd too. Yeppers, But you can't beat the price!   
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»www.wavecrazy.net
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EMC_guy
join:2007-10-13
Sharbot Lake, ON
·Rogers Hi-Speed
| This particular web page lists all Polyphaser coaxial surge protector devices: »www.polyphaser.com/productdata.a···ass=coax
Be aware that Microsoft provides free viewers for Word, PowerPoint, etc. »office.microsoft.com/en-us/downl···033.aspx |
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sporkme
drop the crantini and move it, sister
Premium,MVM
join:2000-07-01
Morristown, NJ
·Optimum Online
| Not on any platform I've been using for the past seven years or so.
I could go on... For now, this bumping means more people learn about grounding. |
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Splitpair
Premium
join:2000-07-29
Cow Towne
 ·T-Mobile US
| reply to AMD Phreak
said by AMD Phreak :See attached document for a bit of information on different SPD devices that was sent to me from Polyphaser. Corrected PDF with graphics.
Wayne
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If you cannot fix it with a buttset and some beanies you ain't a technician.
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lutful
Premium
join:2005-06-16
Ottawa, ON
·TekSavvy Solutions..
| reply to AMD Phreak
I will summarize the main points for lazy folks who won't read a 3-page document.
Polyphaser engineers applied a 6kV/3kA 8/20uS test pulse into 50 ohm load to various surge protector devices and discovered:
1. Their straight gas tube protector let through short +707V and -62V peak pulses. FYI these are the common GDT devices used and recommended by WISP forum members.
2. Their quarter-wave stub protector passed a ringing waveform with +9V and -4V peaks which should be OK for most WISP products.
To improve on perceived shortcomings of quarter-wave, Polyphaser engineers asked themselves: "What if we could design a dc blocked rf bandpass filter with a frequency range of 800 – 2300 MHz, an insertion loss of 0.1 dB, and less than 1.1:1 SWR over the entire frequency range?"
They show that their DC-blocking SX series protector let through only 300mV peak but I have to think about the 2ohm source impedance for their test pulse. Also they have a model that covers 800-2500Mhz but none for 5Ghz yet.
Anyway quite promising product but I still recommend the much more robust quarter-wave protectors, specially the Nextek WISP models which cover 2.4Ghz+5Ghz in same unit. |
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Splitpair
Premium
join:2000-07-29
Cow Towne
·T-Mobile US
1 edit | said by lutful :Polyphaser engineers applied a 6kV/3kA 8/20uS test pulse into 50 ohm load to various surge protector devices and discovered: Ouch thats enough to let the smoke out!
Wayne
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If you cannot fix it with a buttset and some beanies you ain't a technician.
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lutful
Premium
join:2005-06-16
Ottawa, ON
·TekSavvy Solutions..
| said by Splitpair :said by lutful :Polyphaser engineers applied a 6kV/3kA 8/20uS test pulse into 50 ohm load to various surge protector devices and discovered: Ouch thats enough to let the smoke out! FYI it is possible to create 100kA+ simulated direct strikes for test purposes. Only a poor quality protector will smoke at just 3kA if it is properly grounded with a short and wide strap.
I include similar test results from an old Nextek magazine article that shows the relative performance of their GDT and quarter-wave devices. The let-through for their QWS is much less.
Also I notice at the end of the Polyphaser document, they sort of dismiss any surge current rating above 50kA. Their skepticism is obviously aimed at competitor Nextek whose quarter-wave+GDT hybrids are rated for 120kA and now an astounding 200kA. »www.nexteklightning.com/products···rid.html
I suspect Polyphaser engineers have not yet figured out how to improve that spec or even perform that test. They have also fallen behind Nextek in supporting high frequency licensed radios. |
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Splitpair
Premium
join:2000-07-29
Cow Towne
·T-Mobile US
| Ever worked with H+S protectors? Kinda pricey but they work well.
»www.hubersuhner.com/products/hs-···p-pg.htm
Wayne
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If you cannot fix it with a buttset and some beanies you ain't a technician.
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Splitpair
Premium
join:2000-07-29
Cow Towne
·T-Mobile US
1 edit | reply to lutful
said by lutful :I include similar test results from an old Nextek magazine article that shows the relative performance of their GDT and quarter-wave devices. BTW on a side note how would you like to find your shorted stub protectors looking like this. Copper thieves need be hung.
Wayne
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If you cannot fix it with a buttset and some beanies you ain't a technician.
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AMD Phreak
Premium
join:2003-12-14
1 edit | reply to AMD Phreak
Lutful, I just deployed a 5GHz model. It's the DC blocked filter too. I picked the unit based on the specs and let-through being very low.
»www.tessco.com/products/displayP···ntPage=1
Normally I use Terrawave or Altelicon gas tube units but these were too good to pass up IMO.
Time will tell. The primary purpose for me is static protection on the center pin, and then lightning protection overall.
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"No job is so important, and no service is so urgent that we cannot take the time to perform our work safely."
-- AT&T, Your World, Destroyed.
--Safety One Tower Rescue Certified
--LLigetfa:"Wimax is like teenage sex. Everyone talks about doing it." |
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AMD Phreak
Premium
join:2003-12-14 | reply to Splitpair
Wayne where is the rest of the trapeze for those arrestors? lol....
Die copper theives, die! |
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lutful
Premium
join:2005-06-16
Ottawa, ON
·TekSavvy Solutions..
| reply to AMD Phreak
said by AMD Phreak :The primary purpose for me is static protection on the center pin, and then lightning protection overall. ESD protection circuits and components are quite different than what is inside any available lightning surge protectors.
Going with my concocted scenarios, imagine you want to deploy a radio on a weather ballon that will travel through highly charged clouds. You want very robust protection against static discharge but cannot really provide a path to real ground for your Polyphaser.
Due to proliferation of cell phones and iPods, ESD protection has become a very large and mature business unlike lightning protection and IC costs have come down below $1. There is no justification for any radio or SBC designer to skip on-board ESD protection.  |
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AMD Phreak
Premium
join:2003-12-14 | So what would you propose then? I have no other ideas for tower top mounted radios. |
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lutful
Premium
join:2005-06-16
Ottawa, ON
·TekSavvy Solutions..
| said by AMD Phreak :So what would you propose then? I have no other ideas for tower top mounted radios. Ideally you will switch to radio/SBC with good quality on-board ESD protection - datasheet will mention various US and EU certification. You will still need external lightning protection of course.
FYI a quarter-wave stub looks like short to static charge so they bleed off within nanoseconds. I have proposed this particular wideband Nextek device since 2006 which costs a tad more than Polyphaser SX but provides a ton more protection IMHO. Even Huber+Suhner does not have an equivalent device. |
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AMD Phreak
Premium
join:2003-12-14
| Yes i am aware of the quarter stubs protection ability but when I inquired to the polyphaser rep on the phone the other day he said they do not have one that works to 6ghz. i'd gladly buy the model you refer to however i am limited to what tessco, talley, hutton sell. |
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