Re: [Repeater-Builder] Polyphaser Question
If you have a problem with a ground due to terrain issues, you might want to look into using Lyncole grounding rods. These are hollow copper tubes with a chemical crystal compound inside. The rod has some tapes around breather holes which you remove prior to burying in betonite clay etc.. The top of the rod is left just above ground in a round housing / inspection cover. These create temperature differential between top and bottom and create moisture condensation which leaches out and creates a better ground over time. There is also a L shaped grounding rod which is laid in a trench in case you can't dig down 8ft or so. Usually only one or two rods are required to achieve the 4 ohms. Peter On Thu, Aug 19, 2010 at 12:01 AM, Tim tahr...@swtexas.net wrote: This has been a very interesting thread to watch, and most of the installations that I've done have been 'add-ons' to existing well designed systems. On a different note, I'm now working on a solar powered system, and was wondering about the grounding there. Everything will be mounted on a single pole, which will be several feet in the ground. I had planned to make a ground system in a 3 or 4 'spoke' design, with a ground rod at each end of the spoke. There will also be a ground rod within several inches of the pole. Each spoke and the pole will be tied together at a common point. I haven't put any of the rods into the ground here... I use the term 'ground' somewhat loosely.. there is a LOT of rock on the tops of these hills here. Not sure I'll be able to get them all the desired depth. Anyhow, suggestions and comments are welcome. The pole will not be the tallest thing on the hill, there are several Oak trees that will be higher. Provide any cover? Thanks, Tim
RE: [Repeater-Builder] Polyphaser Question
Tim tahr...@swtexas.net wrote: This has been a very interesting thread to watch, and most of the installations that I've done have been 'add-ons' to existing well designed systems. On a different note, I'm now working on a solar powered system, and was wondering about the grounding there. Everything will be mounted on a single pole, which will be several feet in the ground. I had planned to make a ground system in a 3 or 4 'spoke' design, with a ground rod at each end of the spoke. There will also be a ground rod within several inches of the pole. Each spoke and the pole will be tied together at a common point. I haven't put any of the rods into the ground here... I use the term 'ground' somewhat loosely.. there is a LOT of rock on the tops of these hills here. Not sure I'll be able to get them all the desired depth. Anyhow, suggestions and comments are welcome. The pole will not be the tallest thing on the hill, there are several Oak trees that will be higher. Provide any cover? Thanks, Tim Tim , when I needed to add ground rods in rocks soil I use a 1/2 inch masonary drill bit with 2 or 3 18 inch bit extensions and a CORDLESS drill. The cordless drill lets you add a small amount of water to thehole as you drill. By using a 1/2 inch bit, the 5/8 inch ground rods are still in tight contact with the sides of the hole, as you drive them in. Remember to space the ground rods apart a distance equal to their length. An 8 foot rod will need 8 foot from each ground rod AND the center rod. Personally, I use bare, tinned #8 or larger wire and complete the ring around the furthest ground rods buried below the frost line. I have done this for many years, including a solar site I built near Bloomfield, NM. I went to check it after a bad storm, as a precaution. My site had survived ok with just a little brush on the panels. The commerical site next door on commerical power was like an ant bed with all of the techs crawling over each other to fix their equipment. Jeff N5SXQ
Re: [Repeater-Builder] Polyphaser Question
I don't think that you have necessarily wasted your time, but you have severely limited your chances of decreasing lightning damage. It's like replacing 3 tires on your car that has 4 bad tires, you've bettered your odds but it is not the best fix. I have a site that the owner would throw me off if I started installing single;e point grounding and all kinds of wiring. I use a grounded Polyphasor in hopes that it will decrease my odds of lightning damage. Yes, the purist will say that this is wrong, but it's not my site and I'm a guest. That's the deal and I accept it. It's a case of something is better than nothing. 73, Joe, K1ike On 8/17/2010 10:42 PM, Chuck Kelsey wrote: Leave one unprotected path available and you've wasted your time. Chuck WB2EDV
Re: [Repeater-Builder] Polyphaser Question
OK, yes, you have severely limited your chances of being protected. I'd hazard a guess that it would be a fraction of a percent better than having no protection at all. Your condom has a hole in it ;-) Chuck WB2EDV - Original Message - From: Joe k1ike_m...@snet.net To: Repeater-Builder@yahoogroups.com Sent: Wednesday, August 18, 2010 8:34 AM Subject: Re: [Repeater-Builder] Polyphaser Question I don't think that you have necessarily wasted your time, but you have severely limited your chances of decreasing lightning damage. It's like replacing 3 tires on your car that has 4 bad tires, you've bettered your odds but it is not the best fix. I have a site that the owner would throw me off if I started installing single;e point grounding and all kinds of wiring. I use a grounded Polyphasor in hopes that it will decrease my odds of lightning damage. Yes, the purist will say that this is wrong, but it's not my site and I'm a guest. That's the deal and I accept it. It's a case of something is better than nothing. 73, Joe, K1ike On 8/17/2010 10:42 PM, Chuck Kelsey wrote: Leave one unprotected path available and you've wasted your time. Chuck WB2EDV
Re: [Repeater-Builder] Polyphaser Question
Better than a fraction of a percent protection. I've lost a couple of polyphasors in the years, but never had lightning damage. I'm a realist, everything isn't perfect all of the time. 73, Joe, K1ike On 8/18/2010 9:04 AM, Chuck Kelsey wrote: OK, yes, you have severely limited your chances of being protected. I'd hazard a guess that it would be a fraction of a percent better than having no protection at all. Your condom has a hole in it ;-) Chuck WB2EDV - Original Message - From: Joek1ike_m...@snet.net To:Repeater-Builder@yahoogroups.com Sent: Wednesday, August 18, 2010 8:34 AM Subject: Re: [Repeater-Builder] Polyphaser Question I don't think that you have necessarily wasted your time, but you have severely limited your chances of decreasing lightning damage. It's like replacing 3 tires on your car that has 4 bad tires, you've bettered your odds but it is not the best fix. I have a site that the owner would throw me off if I started installing single;e point grounding and all kinds of wiring. I use a grounded Polyphasor in hopes that it will decrease my odds of lightning damage. Yes, the purist will say that this is wrong, but it's not my site and I'm a guest. That's the deal and I accept it. It's a case of something is better than nothing. 73, Joe, K1ike On 8/17/2010 10:42 PM, Chuck Kelsey wrote: Leave one unprotected path available and you've wasted your time. Chuck WB2EDV Yahoo! Groups Links
Re: [Repeater-Builder] Polyphaser Question
Lightning protection is not simply a surge protector but a system of surge protectors, grounds and installation techniques that may reduce the effects of a nearby lightning event. And as Chuck says unless you install a lightning/grounding system the effect of a single device is negligible. Bill - WA0CBW In a message dated 8/18/2010 8:05:20 A.M. Central Daylight Time, wb2...@roadrunner.com writes: OK, yes, you have severely limited your chances of being protected. I'd hazard a guess that it would be a fraction of a percent better than having no protection at all. Your condom has a hole in it ;-) Chuck WB2EDV - Original Message - From: Joe k1ike_m...@snet.net To: Repeater-Builder@yahoogroups.com Sent: Wednesday, August 18, 2010 8:34 AM Subject: Re: [Repeater-Builder] Polyphaser Question I don't think that you have necessarily wasted your time, but you have severely limited your chances of decreasing lightning damage. It's like replacing 3 tires on your car that has 4 bad tires, you've bettered your odds but it is not the best fix. I have a site that the owner would throw me off if I started installing single;e point grounding and all kinds of wiring. I use a grounded Polyphasor in hopes that it will decrease my odds of lightning damage. Yes, the purist will say that this is wrong, but it's not my site and I'm a guest. That's the deal and I accept it. It's a case of something is better than nothing. 73, Joe, K1ike On 8/17/2010 10:42 PM, Chuck Kelsey wrote: Leave one unprotected path available and you've wasted your time. Chuck WB2EDV Yahoo! Groups Links
Re: [Repeater-Builder] Polyphaser Question
On 8/17/2010 11:55 PM, Ray Brown wrote: What do you do when you want to install a small UHF linking repeater on a 4-story building that has no lightning protection on its' roof? (this is to link an ambulance at a hospital to its' base repeater 40 miles away) From what I've heard, it may not be a good idea to hook it to the HVAC, either. (sigh) Ray, KB0STN No. I would find the nearest copper pipe from either the in-house water system or the sprinkler system, and clamp to that (making sure you don't crimp the pipe!!!) using #6 or maybe #8 wire if it's REALLY close (less then 5') Again, not as good as a dedicated system, but MUCH better then nothing.
Re: [Repeater-Builder] Polyphaser Question
Remember the objective is not to take the brunt of a lightning strike, but to drain off any static that would attract that strike. Lightning is just a spark looking to close the gap, and if your antenna is closer to DC ground, it will find something closer to its potential (i.e. static charged) to hit. Any protection is better than nothing, and don't scrimp on buying the cheapest used protector. Its your equipment your protecting and potentially avoiding liability. I buy new Polyphasers for our site and sleep just fine. On 08/18/2010 08:56 AM, wd8chl wrote: On 8/17/2010 11:55 PM, Ray Brown wrote: What do you do when you want to install a small UHF linking repeater on a 4-story building that has no lightning protection on its' roof? (this is to link an ambulance at a hospital to its' base repeater 40 miles away) From what I've heard, it may not be a good idea to hook it to the HVAC, either. (sigh) Ray, KB0STN No. I would find the nearest copper pipe from either the in-house water system or the sprinkler system, and clamp to that (making sure you don't crimp the pipe!!!) using #6 or maybe #8 wire if it's REALLY close (less then 5') Again, not as good as a dedicated system, but MUCH better then nothing.
Re: [Repeater-Builder] Polyphaser Question
Well, at least we can say you've lost some PolyPhasers in the process. Whether they've helped is anyone's guess. Yes, I've got some equipment in different locations with what I feel less than adequate protection. My point was essentially making people aware that by simply putting a suppression device on a single I/O port, while others receive none, and a poor grounding system, isn't going to give a high level of protection. If one chooses to proceed knowing this, then that's a personal decision. Chuck WB2EDV - Original Message - From: Joe k1ike_m...@snet.net To: Repeater-Builder@yahoogroups.com Sent: Wednesday, August 18, 2010 9:26 AM Subject: Re: [Repeater-Builder] Polyphaser Question Better than a fraction of a percent protection. I've lost a couple of polyphasors in the years, but never had lightning damage. I'm a realist, everything isn't perfect all of the time. 73, Joe, K1ike
Re: [Repeater-Builder] Polyphaser Question
The building has a steel support structure, I'm sure. You will need to bond to that as a start. Bill From: Eric Lemmon wb6...@verizon.net To: Repeater-Builder@yahoogroups.com Sent: Tue, August 17, 2010 11:30:03 PM Subject: RE: [Repeater-Builder] Polyphaser Question Ray, I suggest that you obtain the most recent edition (2011) of NFPA 780, the Standard for the Installation of Lightning Protection Systems, and install a proper lightning protection system for your antenna and mast per that document. It can be purchased for about $40, but you might find a copy in a municipal library. Please be aware that installing an antenna atop a building that has no lightning protection system installed may impose liability on you, if the antenna is not protected by a proper system and a fire or other damage occurs due to a lightning strike. In some landmark cases, the insurance company declined to pay for damages resulting from a poorly-designed and/or -installed LP system. Choose wisely... 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Ray Brown Sent: Tuesday, August 17, 2010 8:55 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Polyphaser Question What do you do when you want to install a small UHF linking repeater on a 4-story building that has no lightning protection on its roof? (this is to link an ambulance at a hospital to its base repeater 40 miles away) From what I've heard, it may not be a good idea to hook it to the HVAC, either. (sigh) Ray, KB0STN Yahoo! Groups Links http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Polyphaser Question
On 8/18/2010 11:46 AM, Bill Smith wrote: The building has a steel support structure, I'm sure. You will need to bond to that as a start. Bill An even better choice, yes. You should be able to clean off a spot and clamp to an I-beam. Make sure you get down to bare metal under the clamp. From: Eric Lemmonwb6...@verizon.net To: Repeater-Builder@yahoogroups.com Sent: Tue, August 17, 2010 11:30:03 PM Subject: RE: [Repeater-Builder] Polyphaser Question Ray, I suggest that you obtain the most recent edition (2011) of NFPA 780, the Standard for the Installation of Lightning Protection Systems, and install a proper lightning protection system for your antenna and mast per that document. It can be purchased for about $40, but you might find a copy in a municipal library. Please be aware that installing an antenna atop a building that has no lightning protection system installed may impose liability on you, if the antenna is not protected by a proper system and a fire or other damage occurs due to a lightning strike. In some landmark cases, the insurance company declined to pay for damages resulting from a poorly-designed and/or -installed LP system. Choose wisely... 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Ray Brown Sent: Tuesday, August 17, 2010 8:55 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Polyphaser Question What do you do when you want to install a small UHF linking repeater on a 4-story building that has no lightning protection on its roof? (this is to link an ambulance at a hospital to its base repeater 40 miles away) From what I've heard, it may not be a good idea to hook it to the HVAC, either. (sigh) Ray, KB0STN Yahoo! Groups Links http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Polyphaser Question
You might like to look at the latest Motorola R56 Installation standards manual. It's very comprehensive. Has good section on grounding and protective devices. Yes, a good grounding system and a full lightning and surge protection of an RF site doesn't come cheap. But if you live in Florida the lightning capital of USA or similar location then every step you can take can save really big bucks in system damage and give you more system up time. Back in the mid 1990's I did a R56 installation of a 800MHZ trunking system in Manaus, Amazonas in Brazil.This was co-located with a 50KW TV and 20KW FM radio site and also at the same site he was running the local ISP vial dial in landlines. The customer initially thought we were really overdoing the trunking installation by following R56.But after a massive direct strike which took out both broadcast transmitters and burnt out every one of his hundred or so Modems, but thanks to our following the R56 installation guidelines the 800Mhz site kept on happily trunking. He then read with great interest the R56 manual and applied it to his whole installation. Peter On Wed, Aug 18, 2010 at 8:34 AM, Joe k1ike_m...@snet.net wrote: I don't think that you have necessarily wasted your time, but you have severely limited your chances of decreasing lightning damage. It's like replacing 3 tires on your car that has 4 bad tires, you've bettered your odds but it is not the best fix. I have a site that the owner would throw me off if I started installing single;e point grounding and all kinds of wiring. I use a grounded Polyphasor in hopes that it will decrease my odds of lightning damage. Yes, the purist will say that this is wrong, but it's not my site and I'm a guest. That's the deal and I accept it. It's a case of something is better than nothing. 73, Joe, K1ike On 8/17/2010 10:42 PM, Chuck Kelsey wrote: Leave one unprotected path available and you've wasted your time. Chuck WB2EDV
RE: [Repeater-Builder] Polyphaser Question
Here is a little primer on lightning: Having your antenna grounded does not drain off any charge that helps prevent a strike. As a matter of fact grounding the antenna makes it slightly more prone to a strike but not grounding it is much worse as you have no control over what path the energy will take if not grounded. When a storm cloud moves over the area charge builds on objects on the ground. The ground items, towers etc start to emit streamers. When a strike is imminent step leaders come down from the charged cloud and move in approximately 150 foot steps. Changing directions with each step. When a step leader gets close enough to a streamer a connection is made. What follows is a plasma trail which is a very low impedance path that the lightning charge follows. Lightning can be thought of as a current source. In other words if there is a 10 KA strike it is going to develop that much current into whatever it strikes. If for example it hits your tower and the total impedance to ground is quite low then the voltage developed across the tower will be relatively low. But if the ground system is not a good one then the voltage will rise higher. It will still develop the 10 KA current. Bonding all equipment to a common point is one of the first steps to take. Just adding a polyphaser coax protector to the coax line will only equalize the current between center conductor and shield. If power is not protected and everything bonded together the coax protector will do little good. Even without a coax protector, just bonding everything is a great first step. The whole idea is to keep everything at the same voltage level when a strike occurs. 73 Gary K4FMX _ From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Tony KT9AC Sent: Wednesday, August 18, 2010 9:25 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Polyphaser Question Remember the objective is not to take the brunt of a lightning strike, but to drain off any static that would attract that strike. Lightning is just a spark looking to close the gap, and if your antenna is closer to DC ground, it will find something closer to its potential (i.e. static charged) to hit. Any protection is better than nothing, and don't scrimp on buying the cheapest used protector. Its your equipment your protecting and potentially avoiding liability. I buy new Polyphasers for our site and sleep just fine. On 08/18/2010 08:56 AM, wd8chl wrote: On 8/17/2010 11:55 PM, Ray Brown wrote: What do you do when you want to install a small UHF linking repeater on a 4-story building that has no lightning protection on its' roof? (this is to link an ambulance at a hospital to its' base repeater 40 miles away) From what I've heard, it may not be a good idea to hook it to the HVAC, either. (sigh) Ray, KB0STN No. I would find the nearest copper pipe from either the in-house water system or the sprinkler system, and clamp to that (making sure you don't crimp the pipe!!!) using #6 or maybe #8 wire if it's REALLY close (less then 5') Again, not as good as a dedicated system, but MUCH better then nothing.
Re: [Repeater-Builder] Polyphaser Question
And to not create (or leave) a path for current flow to destroy equipment. Chuck WB2EDV - Original Message - From: Gary Schafer To: Repeater-Builder@yahoogroups.com Sent: Wednesday, August 18, 2010 8:39 PM Subject: RE: [Repeater-Builder] Polyphaser Question Here is a little primer on lightning: [SNIP] The whole idea is to keep everything at the same voltage level when a strike occurs. 73 Gary K4FMX
Re: [Repeater-Builder] Polyphaser Question
I agree totally with Gary. Common grounding point is essential to avoid voltage differences between equipment during a strike. When you get a strike the grounding point will rise, so you want to make sure everything that is grounded goes up together. As the leading edges of the voltages strikes are very sharp, low inductance grounding is important, so a large size cable or strip, smooth curves from the expected strike source to ground point and definitely no loops in those equipment ground cables. Covering every possible strike source, so ground kits on the transmission lines, surge protectors on tower light wiring, a main surge arrestor located at the incoming AC breaker or if you have a generator set at the AC entry before the Transfer panel. All Telephone lines or external T1's or control lines should have suitable grounded surge protectors. Transtector has a great line of AC Telephone, T1 protectors and they have just merged with Polyphasor. They even have a web page with items approved for Motorola R56 installations. The coax Polyphasor are really there to stop a high voltage developing between the center and shield. Thats just a small part of the problem. You need ground kits along the transmission lines, one at the top, one in the middle and one just before it enters the building, AC protectors, and a well grounded tower. All that will connect to common point to a good buried external grounding system using Exothermic Cadwelded connections with hopefully a less than 4 ohms ground resistance. A now you are all set to take on those strikes :) Peter On Wed, Aug 18, 2010 at 8:39 PM, Gary Schafer gascha...@comcast.net wrote: Here is a little primer on lightning: Having your antenna grounded does not drain off any charge that helps prevent a strike. As a matter of fact grounding the antenna makes it slightly more prone to a strike but not grounding it is much worse as you have no control over what path the energy will take if not grounded. When a storm cloud moves over the area charge builds on objects on the ground. The ground items, towers etc start to emit streamers. When a strike is imminent step leaders come down from the charged cloud and move in approximately 150 foot steps. Changing directions with each step. When a step leader gets close enough to a streamer a connection is made. What follows is a plasma trail which is a very low impedance path that the lightning charge follows. Lightning can be thought of as a current source. In other words if there is a 10 KA strike it is going to develop that much current into whatever it strikes. If for example it hits your tower and the total impedance to ground is quite low then the voltage developed across the tower will be relatively low. But if the ground system is not a good one then the voltage will rise higher. It will still develop the 10 KA current. Bonding all equipment to a common point is one of the first steps to take. Just adding a polyphaser coax protector to the coax line will only equalize the current between center conductor and shield. If power is not protected and everything bonded together the coax protector will do little good. Even without a coax protector, just bonding everything is a great first step. The whole idea is to keep everything at the same voltage level when a strike occurs. 73 Gary K4FMX -- *From:* Repeater-Builder@yahoogroups.com [mailto: repeater-buil...@yahoogroups.com] *On Behalf Of *Tony KT9AC *Sent:* Wednesday, August 18, 2010 9:25 AM *To:* Repeater-Builder@yahoogroups.com *Subject:* Re: [Repeater-Builder] Polyphaser Question Remember the objective is not to take the brunt of a lightning strike, but to drain off any static that would attract that strike. Lightning is just a spark looking to close the gap, and if your antenna is closer to DC ground, it will find something closer to its potential (i.e. static charged) to hit. Any protection is better than nothing, and don't scrimp on buying the cheapest used protector. Its your equipment your protecting and potentially avoiding liability. I buy new Polyphasers for our site and sleep just fine. On 08/18/2010 08:56 AM, wd8chl wrote: On 8/17/2010 11:55 PM, Ray Brown wrote: What do you do when you want to install a small UHF linking repeater on a 4-story building that has no lightning protection on its' roof? (this is to link an ambulance at a hospital to its' base repeater 40 miles away) From what I've heard, it may not be a good idea to hook it to the HVAC, either. (sigh) Ray, KB0STN No. I would find the nearest copper pipe from either the in-house water system or the sprinkler system, and clamp to that (making sure you don't crimp the pipe!!!) using #6 or maybe #8 wire if it's REALLY close (less then 5') Again, not as good as a dedicated system, but MUCH better then nothing.
Re: [Repeater-Builder] Polyphaser Question
Michael Ryan mryan...@tampabay.rr.com wrote: I notice when looking at the Polyphaser website, there are a wide range of products, even a wide variety of items that on the surface appear to be suited to my particular needs. I want to put a Polyphaser on my 220 repeater. There are DC blocked and unblocked. I don't suppose it matters in that area as there is no DC going up the coax. There are freq ranges, 1.5-400 and 100 - 700 mhz, etc, etc.. Is it best to select a model that places my operating freq somewhere in the middle of the unit's operating range or does that matter as long as it IS WITHIN the range of the device someplace? I need the protected end to be an N-female and the antenna end to be and N-Male. Suggestions? - Mike Mike...At the risk of sounding dumb, when in doubt ask the manufacturer. In other words call Polyphaser and TALK with them. The have info that is NOT always listed where the general public can access it. And I can say from experience that the techs I have talked to at Polyphaser are very friendly and helpful. Just give them HONEST info about the power output level, bands, number of tx on at a time, etc. They're glad to helpyou become a satisfied customer. Jeff N5sxq
RE: [Repeater-Builder] Polyphaser Question
Will do….in fact I meant to call them today. Just got busy…I was emailed about a possible unit that is available, but provides a block for DC which was not apparently a favorite amongst the group here. But I will call them on Thursday and see what the recommend. Thanks to all …. - Mike From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of n5sx...@charter.net Sent: Wednesday, August 18, 2010 11:19 PM To: Repeater-Builder@yahoogroups.com Cc: Michael Ryan Subject: Re: [Repeater-Builder] Polyphaser Question Michael Ryan mryan...@tampabay.rr.com mailto:mryan001%40tampabay.rr.com wrote: I notice when looking at the Polyphaser website, there are a wide range of products, even a wide variety of items that on the surface appear to be suited to my particular needs. I want to put a Polyphaser on my 220 repeater. There are DC blocked and unblocked. I don't suppose it matters in that area as there is no DC going up the coax. There are freq ranges, 1.5-400 and 100 - 700 mhz, etc, etc.. Is it best to select a model that places my operating freq somewhere in the middle of the unit's operating range or does that matter as long as it IS WITHIN the range of the device someplace? I need the protected end to be an N-female and the antenna end to be and N-Male. Suggestions? - Mike Mike...At the risk of sounding dumb, when in doubt ask the manufacturer. In other words call Polyphaser and TALK with them. The have info that is NOT always listed where the general public can access it. And I can say from experience that the techs I have talked to at Polyphaser are very friendly and helpful. Just give them HONEST info about the power output level, bands, number of tx on at a time, etc. They're glad to helpyou become a satisfied customer. Jeff N5sxq __ Information from ESET NOD32 Antivirus, version of virus signature database 5377 (20100818) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 5377 (20100818) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com
RE: [Repeater-Builder] Polyphaser Question
This has been a very interesting thread to watch, and most of the installations that I've done have been 'add-ons' to existing well designed systems. On a different note, I'm now working on a solar powered system, and was wondering about the grounding there. Everything will be mounted on a single pole, which will be several feet in the ground. I had planned to make a ground system in a 3 or 4 'spoke' design, with a ground rod at each end of the spoke. There will also be a ground rod within several inches of the pole. Each spoke and the pole will be tied together at a common point. I haven't put any of the rods into the ground here... I use the term 'ground' somewhat loosely.. there is a LOT of rock on the tops of these hills here. Not sure I'll be able to get them all the desired depth. Anyhow, suggestions and comments are welcome. The pole will not be the tallest thing on the hill, there are several Oak trees that will be higher. Provide any cover? Thanks, Tim
Re: [Repeater-Builder] Polyphaser Question
Hi Michael, Probably for 220MHZ choose between VHF50HN-ME for high powered TX or multiple TX'sand a IS-B50LN-C0-MA is for a single normal power TX. These have the N connectors sexed as you want.Check the power rating of each device at your frequency. Peter On Tue, Aug 17, 2010 at 2:51 AM, Michael Ryan mryan...@tampabay.rr.comwrote: I notice when looking at the Polyphaser website, there are a wide range of products, even a wide variety of items that on the surface appear to be suited to my particular needs. I want to put a Polyphaser on my 220 repeater. There are DC blocked and unblocked. I don’t suppose it matters in that area as there is no DC going up the coax. There are freq ranges, 1.5-400 and 100 – 700 mhz, etc, etc.. Is it best to select a model that places my operating freq somewhere in the middle of the unit’s operating range or does that matter as long as it IS WITHIN the range of the device someplace? I need the protected end to be an N-female and the antenna end to be and N-Male. Suggestions? - Mike __ Information from ESET NOD32 Antivirus, version of virus signature database 5371 (20100816) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com
RE: [Repeater-Builder] Polyphaser Question
Thanks a lot.I see them on QTH.com for sale once in a while. I just posted an ad looking for one. '73, Mike From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of petedcur...@gmail.com Sent: Tuesday, August 17, 2010 11:03 AM To: Repeater-Builder Subject: Re: [Repeater-Builder] Polyphaser Question Hi Michael, Probably for 220MHZ choose between VHF50HN-ME for high powered TX or multiple TX'sand a IS-B50LN-C0-MA is for a single normal power TX. These have the N connectors sexed as you want.Check the power rating of each device at your frequency. Peter On Tue, Aug 17, 2010 at 2:51 AM, Michael Ryan mryan...@tampabay.rr.com wrote: I notice when looking at the Polyphaser website, there are a wide range of products, even a wide variety of items that on the surface appear to be suited to my particular needs. I want to put a Polyphaser on my 220 repeater. There are DC blocked and unblocked. I don't suppose it matters in that area as there is no DC going up the coax. There are freq ranges, 1.5-400 and 100 - 700 mhz, etc, etc.. Is it best to select a model that places my operating freq somewhere in the middle of the unit's operating range or does that matter as long as it IS WITHIN the range of the device someplace? I need the protected end to be an N-female and the antenna end to be and N-Male. Suggestions? - Mike __ Information from ESET NOD32 Antivirus, version of virus signature database 5371 (20100816) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 5373 (20100817) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 5373 (20100817) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com
Re: [Repeater-Builder] Polyphaser Question
If you are buying used, buyer beware. They could be shot. Chuck WB2EDV - Original Message - From: Michael Ryan To: Repeater-Builder@yahoogroups.com Sent: Tuesday, August 17, 2010 11:12 AM Subject: RE: [Repeater-Builder] Polyphaser Question Thanks a lot.I see them on QTH.com for sale once in a while. I just posted an ad looking for one. '73, Mike From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of petedcur...@gmail.com Sent: Tuesday, August 17, 2010 11:03 AM To: Repeater-Builder Subject: Re: [Repeater-Builder] Polyphaser Question Hi Michael, Probably for 220MHZ choose between VHF50HN-ME for high powered TX or multiple TX'sand a IS-B50LN-C0-MA is for a single normal power TX. These have the N connectors sexed as you want.Check the power rating of each device at your frequency. Peter On Tue, Aug 17, 2010 at 2:51 AM, Michael Ryan mryan...@tampabay.rr.com wrote: I notice when looking at the Polyphaser website, there are a wide range of products, even a wide variety of items that on the surface appear to be suited to my particular needs. I want to put a Polyphaser on my 220 repeater. There are DC blocked and unblocked. I don't suppose it matters in that area as there is no DC going up the coax. There are freq ranges, 1.5-400 and 100 - 700 mhz, etc, etc.. Is it best to select a model that places my operating freq somewhere in the middle of the unit's operating range or does that matter as long as it IS WITHIN the range of the device someplace? I need the protected end to be an N-female and the antenna end to be and N-Male. Suggestions? - Mike __ Information from ESET NOD32 Antivirus, version of virus signature database 5371 (20100816) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 5373 (20100817) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 5373 (20100817) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 5373 (20100817) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com -- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.851 / Virus Database: 271.1.1/3077 - Release Date: 08/17/10 02:35:00
RE: [Repeater-Builder] Polyphaser Question
Chuck, Thanks for that.wouldn't still pass RF if they are blown will they? - m From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Chuck Kelsey Sent: Tuesday, August 17, 2010 11:51 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Polyphaser Question If you are buying used, buyer beware. They could be shot. Chuck WB2EDV - Original Message - From: Michael Ryan mailto:mryan...@tampabay.rr.com To: Repeater-Builder@yahoogroups.com Sent: Tuesday, August 17, 2010 11:12 AM Subject: RE: [Repeater-Builder] Polyphaser Question Thanks a lot.I see them on QTH.com for sale once in a while. I just posted an ad looking for one. '73, Mike From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of petedcur...@gmail.com Sent: Tuesday, August 17, 2010 11:03 AM To: Repeater-Builder Subject: Re: [Repeater-Builder] Polyphaser Question Hi Michael, Probably for 220MHZ choose between VHF50HN-ME for high powered TX or multiple TX'sand a IS-B50LN-C0-MA is for a single normal power TX. These have the N connectors sexed as you want.Check the power rating of each device at your frequency. Peter On Tue, Aug 17, 2010 at 2:51 AM, Michael Ryan mryan...@tampabay.rr.com wrote: I notice when looking at the Polyphaser website, there are a wide range of products, even a wide variety of items that on the surface appear to be suited to my particular needs. I want to put a Polyphaser on my 220 repeater. There are DC blocked and unblocked. I don't suppose it matters in that area as there is no DC going up the coax. There are freq ranges, 1.5-400 and 100 - 700 mhz, etc, etc.. Is it best to select a model that places my operating freq somewhere in the middle of the unit's operating range or does that matter as long as it IS WITHIN the range of the device someplace? I need the protected end to be an N-female and the antenna end to be and N-Male. Suggestions? - Mike __ Information from ESET NOD32 Antivirus, version of virus signature database 5371 (20100816) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 5373 (20100817) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 5373 (20100817) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 5373 (20100817) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com _ No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.851 / Virus Database: 271.1.1/3077 - Release Date: 08/17/10 02:35:00 __ Information from ESET NOD32 Antivirus, version of virus signature database 5374 (20100817) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 5374 (20100817) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com
Re: [Repeater-Builder] Polyphaser Question
Usually, from any reports I've seen, they can exhibit higher than normal VSWR and/or loss if they've seen better days. So, yes, they could still pass RF and not be good. Chuck WB2EDV - Original Message - From: Michael Ryan To: Repeater-Builder@yahoogroups.com Sent: Tuesday, August 17, 2010 3:02 PM Subject: RE: [Repeater-Builder] Polyphaser Question Chuck, Thanks for that.wouldn't still pass RF if they are blown will they? - m
Re: [Repeater-Builder] Polyphaser Question
Polyphasers have a shunt protection element. It usually fails and becomes leaky so you get a loss/VSWR indication. It can fail open or short. If it's open, there is nothing to detect. On 8/17/2010 2:02 PM, Michael Ryan wrote: Chuck, Thanks for that...wouldn't still pass RF if they are blown will they? - m *From:* Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] *On Behalf Of *Chuck Kelsey *Sent:* Tuesday, August 17, 2010 11:51 AM *To:* Repeater-Builder@yahoogroups.com *Subject:* Re: [Repeater-Builder] Polyphaser Question If you are buying used, buyer beware. They could be shot. Chuck WB2EDV -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
RE: [Repeater-Builder] Polyphaser Question
I recently opened up a Polyphaser unit we used on one of our remote sites. it covered both 2m and 70cm. We were experiencing poor receive at the site. Replaced the unit and receiver sensitivity is once again hot. Anyone want pics of the insides respond direct and I'll ship you the photos.not much to see. a gas tube and what looks like a surface mount resistor in series with the gas tube. 73, Dave Wa3gin _ From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Oz-in-DFW Sent: Tuesday, August 17, 2010 4:37 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Polyphaser Question Polyphasers have a shunt protection element. It usually fails and becomes leaky so you get a loss/VSWR indication. It can fail open or short. If it's open, there is nothing to detect.
Re: [Repeater-Builder] Polyphaser Question
Wasn't there a capacitor too? Seems like there was in one I saw open. Chuck WB2EDV - Original Message - From: David Jordan To: Repeater-Builder@yahoogroups.com Sent: Tuesday, August 17, 2010 4:44 PM Subject: RE: [Repeater-Builder] Polyphaser Question I recently opened up a Polyphaser unit we used on one of our remote sites. it covered both 2m and 70cm. We were experiencing poor receive at the site. Replaced the unit and receiver sensitivity is once again hot. Anyone want pics of the insides respond direct and I'll ship you the photos.not much to see. a gas tube and what looks like a surface mount resistor in series with the gas tube. 73, Dave Wa3gin
Re: [Repeater-Builder] Polyphaser Question
Upload the pics to the group PHOTOS section. Always nice to have stuff like that available for reference. Joe M. David Jordan wrote: I recently opened up a Polyphaser unit we used on one of our remote sites… it covered both 2m and 70cm. We were experiencing poor receive at the site. Replaced the unit and receiver sensitivity is once again hot. Anyone want pics of the insides respond direct and I’ll ship you the photos…not much to see… a gas tube and what looks like a surface mount resistor in series with the gas tube. 73, Dave Wa3gin *From:* Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] *On Behalf Of *Oz-in-DFW *Sent:* Tuesday, August 17, 2010 4:37 PM *To:* Repeater-Builder@yahoogroups.com *Subject:* Re: [Repeater-Builder] Polyphaser Question Polyphasers have a shunt protection element. It usually fails and becomes leaky so you get a loss/VSWR indication. It can fail open or short. If it's open, there is nothing to detect. Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/Repeater-Builder/join (Yahoo! ID required) * To change settings via email: repeater-builder-dig...@yahoogroups.com repeater-builder-fullfeatu...@yahoogroups.com * To unsubscribe from this group, send an email to: repeater-builder-unsubscr...@yahoogroups.com * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Polyphaser Question
The units are probably different depending on whether they are HF, VHF, UHF, or 2.4Ghz, etc. - Original Message - From: Chuck Kelsey To: Repeater-Builder@yahoogroups.com Sent: Tuesday, August 17, 2010 4:58 PM Subject: Re: [Repeater-Builder] Polyphaser Question Wasn't there a capacitor too? Seems like there was in one I saw open. Chuck WB2EDV - Original Message - From: David Jordan To: Repeater-Builder@yahoogroups.com Sent: Tuesday, August 17, 2010 4:44 PM Subject: RE: [Repeater-Builder] Polyphaser Question I recently opened up a Polyphaser unit we used on one of our remote sites. it covered both 2m and 70cm. We were experiencing poor receive at the site. Replaced the unit and receiver sensitivity is once again hot. Anyone want pics of the insides respond direct and I'll ship you the photos.not much to see. a gas tube and what looks like a surface mount resistor in series with the gas tube. 73, Dave Wa3gin
Re: [Repeater-Builder] Polyphaser Question
Yup, huge variation by application. Some gas tubes, some MOVs, some resonant stuff. This stuff has a finite life. They have some pretty information on their site: http://www.protectiongroup.com/knowledgebase On 8/17/2010 7:14 PM, WA3GIN wrote: The units are probably different depending on whether they are HF, VHF, UHF, or 2.4Ghz, etc. - Original Message - *From:* Chuck Kelsey mailto:wb2...@roadrunner.com *To:* Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com *Sent:* Tuesday, August 17, 2010 4:58 PM *Subject:* Re: [Repeater-Builder] Polyphaser Question Wasn't there a capacitor too? Seems like there was in one I saw open. Chuck WB2EDV - Original Message - *From:* David Jordan mailto:wa3...@comcast.net *To:* Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com *Sent:* Tuesday, August 17, 2010 4:44 PM *Subject:* RE: [Repeater-Builder] Polyphaser Question I recently opened up a Polyphaser unit we used on one of our remote sites... it covered both 2m and 70cm. We were experiencing poor receive at the site. Replaced the unit and receiver sensitivity is once again hot. Anyone want pics of the insides respond direct and I'll ship you the photos...not much to see... a gas tube and what looks like a surface mount resistor in series with the gas tube. 73, Dave Wa3gin -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport)
RE: [Repeater-Builder] Polyphaser Question
Mike, Perhaps the best course is to choose the unit with the highest Joule rating that meets your power level and frequency ratings. Do not buy a DC-blocked unit if you don't need that feature, because the capacitor is usually the first component to fail. Do not buy a used unit, because it was pulled from service for a reason- probably because the gas tube has reached the end of life due to multiple firings. Finally, be certain that you have a robust grounding connection from the PolyPhaser to Mother Earth; do not depend on the green wire conductor in the power cord to provide this connection. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Michael Ryan Sent: Monday, August 16, 2010 11:51 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Polyphaser Question I notice when looking at the Polyphaser website, there are a wide range of products, even a wide variety of items that on the surface appear to be suited to my particular needs. I want to put a Polyphaser on my 220 repeater. There are DC blocked and unblocked. I don't suppose it matters in that area as there is no DC going up the coax. There are freq ranges, 1.5-400 and 100 - 700 mhz, etc, etc.. Is it best to select a model that places my operating freq somewhere in the middle of the unit's operating range or does that matter as long as it IS WITHIN the range of the device someplace? I need the protected end to be an N-female and the antenna end to be and N-Male. Suggestions? - Mike
Re: [Repeater-Builder] Polyphaser Question
This has been a great discussion. Eric, from the reading I've done it didn't seem to me that the Polyphasers were the best out there, but a European company whose initials were S + H, I think. Care to comment on the best ones, in your opinion? On Tuesday 17 August 2010 21:53:30 Eric Lemmon wrote: Mike, Perhaps the best course is to choose the unit with the highest Joule rating that meets your power level and frequency ratings. Do not buy a DC-blocked unit if you don't need that feature, because the capacitor is usually the first component to fail. Do not buy a used unit, because it was pulled from service for a reason- probably because the gas tube has reached the end of life due to multiple firings. Finally, be certain that you have a robust grounding connection from the PolyPhaser to Mother Earth; do not depend on the green wire conductor in the power cord to provide this connection. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Michael Ryan Sent: Monday, August 16, 2010 11:51 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Polyphaser Question I notice when looking at the Polyphaser website, there are a wide range of products, even a wide variety of items that on the surface appear to be suited to my particular needs. I want to put a Polyphaser on my 220 repeater. There are DC blocked and unblocked. I don't suppose it matters in that area as there is no DC going up the coax. There are freq ranges, 1.5-400 and 100 - 700 mhz, etc, etc.. Is it best to select a model that places my operating freq somewhere in the middle of the unit's operating range or does that matter as long as it IS WITHIN the range of the device someplace? I need the protected end to be an N-female and the antenna end to be and N-Male. Suggestions? - Mike -- STeve Andre' Disease Control Warden Dept. of Political Science Michigan State University A day without Windows is like a day without a nuclear incident.
RE: [Repeater-Builder] Polyphaser Question
Huber and Suhner, I think is who you mean... GOOD stuff, but you pay for it. Headquartered in Switzerland. http://www.hubersuhner.com/products/hs-p-rf/hs-rf-lightning-protectors.htm Mark - N9WYS -Original Message- From: Repeater-Builder@yahoogroups.com On Behalf Of STeve Andre' This has been a great discussion. Eric, from the reading I've done it didn't seem to me that the Polyphasers were the best out there, but a European company whose initials were S + H, I think. Care to comment on the best ones, in your opinion?
Re: [Repeater-Builder] Polyphaser Question
Actually Eric brings up the more important aspect of lightning protection. Simply installing a PolyPhaser on your antenna line won't cut it. A single-point grounding panel where your transmission lines, power, telephone, etc. are all run through protective devices and then are tied in to a ground system is necessary. Leave one unprotected path available and you've wasted your time. Chuck WB2EDV - Original Message - From: Eric Lemmon wb6...@verizon.net To: Repeater-Builder@yahoogroups.com Sent: Tuesday, August 17, 2010 9:53 PM Subject: RE: [Repeater-Builder] Polyphaser Question Mike, Perhaps the best course is to choose the unit with the highest Joule rating that meets your power level and frequency ratings. Do not buy a DC-blocked unit if you don't need that feature, because the capacitor is usually the first component to fail. Do not buy a used unit, because it was pulled from service for a reason- probably because the gas tube has reached the end of life due to multiple firings. Finally, be certain that you have a robust grounding connection from the PolyPhaser to Mother Earth; do not depend on the green wire conductor in the power cord to provide this connection. 73, Eric Lemmon WB6FLY
RE: [Repeater-Builder] Polyphaser Question
Can I have a copy of the photo, it's nice to learn something from it. 73 W4CSO Camilo From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of David Jordan Sent: Tuesday, August 17, 2010 4:45 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Polyphaser Question I recently opened up a Polyphaser unit we used on one of our remote sites. it covered both 2m and 70cm. We were experiencing poor receive at the site. Replaced the unit and receiver sensitivity is once again hot. Anyone want pics of the insides respond direct and I'll ship you the photos.not much to see. a gas tube and what looks like a surface mount resistor in series with the gas tube. 73, Dave Wa3gin _ From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Oz-in-DFW Sent: Tuesday, August 17, 2010 4:37 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Polyphaser Question Polyphasers have a shunt protection element. It usually fails and becomes leaky so you get a loss/VSWR indication. It can fail open or short. If it's open, there is nothing to detect. image001.jpgimage002.jpg
RE: [Repeater-Builder] Polyphaser Question
Steve, PolyPhasers are popular with Hams and commercial users with tight budgets, but they are the economy line as lightning and surge protectors go. Most cellular systems and professional installers prefer to use Huber + Suhner protectors, which cost two or three times what a PolyPhaser costs. I use them at all of my repeater sites, not only because they are waterproof and very robust, but also because the gas tube is easily replaced. The body of the typical unit is machined from a solid billet of stainless steel, and is completely reliable. More information is here: www.hubersuhner.com/ie70/products/hs-p-rf/hs-rf-lightning-protectors.htm H+S products are distributed through commercial communications suppliers such as Tessco, Hutton, and Talley. I have no financial relationship with H+S, being just a satisfied customer. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of STeve Andre' Sent: Tuesday, August 17, 2010 7:53 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Polyphaser Question This has been a great discussion. Eric, from the reading I've done it didn't seem to me that the Polyphasers were the best out there, but a European company whose initials were S + H, I think. Care to comment on the best ones, in your opinion? On Tuesday 17 August 2010 21:53:30 Eric Lemmon wrote: Mike, Perhaps the best course is to choose the unit with the highest Joule rating that meets your power level and frequency ratings. Do not buy a DC-blocked unit if you don't need that feature, because the capacitor is usually the first component to fail. Do not buy a used unit, because it was pulled from service for a reason- probably because the gas tube has reached the end of life due to multiple firings. Finally, be certain that you have a robust grounding connection from the PolyPhaser to Mother Earth; do not depend on the green wire conductor in the power cord to provide this connection. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of Michael Ryan Sent: Monday, August 16, 2010 11:51 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: [Repeater-Builder] Polyphaser Question I notice when looking at the Polyphaser website, there are a wide range of products, even a wide variety of items that on the surface appear to be suited to my particular needs. I want to put a Polyphaser on my 220 repeater. There are DC blocked and unblocked. I don't suppose it matters in that area as there is no DC going up the coax. There are freq ranges, 1.5-400 and 100 - 700 mhz, etc, etc.. Is it best to select a model that places my operating freq somewhere in the middle of the unit's operating range or does that matter as long as it IS WITHIN the range of the device someplace? I need the protected end to be an N-female and the antenna end to be and N-Male. Suggestions? - Mike -- STeve Andre' Disease Control Warden Dept. of Political Science Michigan State University A day without Windows is like a day without a nuclear incident.
Re: [Repeater-Builder] Polyphaser Question
What do you do when you want to install a small UHF linking repeater on a 4-story building that has no lightning protection on its' roof? (this is to link an ambulance at a hospital to its' base repeater 40 miles away) From what I've heard, it may not be a good idea to hook it to the HVAC, either. (sigh) Ray, KB0STN
RE: [Repeater-Builder] Polyphaser Question
Ray, I suggest that you obtain the most recent edition (2011) of NFPA 780, the Standard for the Installation of Lightning Protection Systems, and install a proper lightning protection system for your antenna and mast per that document. It can be purchased for about $40, but you might find a copy in a municipal library. Please be aware that installing an antenna atop a building that has no lightning protection system installed may impose liability on you, if the antenna is not protected by a proper system and a fire or other damage occurs due to a lightning strike. In some landmark cases, the insurance company declined to pay for damages resulting from a poorly-designed and/or -installed LP system. Choose wisely... 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Ray Brown Sent: Tuesday, August 17, 2010 8:55 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Polyphaser Question What do you do when you want to install a small UHF linking repeater on a 4-story building that has no lightning protection on its roof? (this is to link an ambulance at a hospital to its base repeater 40 miles away) From what I've heard, it may not be a good idea to hook it to the HVAC, either. (sigh) Ray, KB0STN
