[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: Properly designed PAs (was: Re: [Repeater-Builder] Coax length, etc.)
Nate, My sincerest thoughts are with you in this time. Don, KD9PT - Original Message - From: Nate Duehr To: Repeater-Builder@yahoogroups.com Sent: Tuesday, August 17, 2010 12:46 AM Subject: Re: Properly designed PAs (was: Re: [Repeater-Builder] Coax length, etc.) On Aug 15, 2010, at 7:06 AM, Jeff DePolo wrote: Whoever said time is money was an idiot. Time is worth inifinitely times more than money. You can make more money. You can even borrow money. Hell, if you were desparate you could even steal money. You can't do any of those things with time. Time is the one resource you can't make more of. With the passing of a loved-one in my family today, truer words could not be spoken. Money won't even buy an additional 5 minutes of idle chit-chat with someone you care about. I'll jump back into the conversation later... family's already on the way here and it's going to be a busy rest of the week. My wife and I are supposed to sing at the funeral, and I'm a pall-bearer. Didn't want you to think I'd disappeared on you Jeff. Appreciate the TIME you took to share your experiences with PAs. Won't have any time to respond with my thoughts for a little while, though. Best Regards, -- Nate Duehr, WY0X n...@natetech.com
Re: [Repeater-Builder] Tait T-555 UHF Repeater
firstly, i guess a lot comes down to your wallet i would if i was going to make a small time PRS repeater, prefer to use maybe a couple of Tait 2020's and ( Duplexor versus twin aerials ) tin shed up on the hill out back versus a 40meter high ( Or more ) tower don't get me wrong t555 are the old trunking mobiles, which yes can be reconfigured for multichannel use on the prs band, trim the hockey sticks a bit and bring the freq up a bit ( i am about to as soon as money allows me to , build a single channel repeater out of 2 T2035's just saving for the line cards you stated ( I was curious as to setting frequencies on these with the diode matrix and worked out the frequencies these were set on and a couple of small holes drilled through the heatsink.. Any help would be great..) do you have the diode matrix software or papers ( Service manual )to set the matrix board, or did you use a frequency counter just trying to get a better picture of your message Not sure what to make of the 2 holes in the heatsink, short of made there for someone to poke wires in or out of Back to you Marcus On Tue, Aug 17, 2010 at 9:17 PM, Floydiboy007 floydi...@ihug.co.nz wrote: Hi all. This is my first on this group.Better late than never. Is there anyone out there that may have had something to do with building a UHF PRS repeater from the above radios. I have two of them and I think that before I bought them they may have already been in a repeater config. I was curious as to setting frequencies on these with the diode matrix and worked out the frequencies these were set on and a couple of small holes drilled through the heatsink.. Any help would be great.. Cheers Mike
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: Properly designed PAs (was: Re: [Repeater-Builder] Coax length, etc.)
Nate, Please accept my sympathies and condolences to you and your family. I agree with you on the time aspect entirely. With Prayers - John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202 http://tinyurl.com/2dtngmn - Original Message - From: Nate Duehr To: Repeater-Builder@yahoogroups.com Sent: Monday, August 16, 2010 10:46 PM Subject: Re: Properly designed PAs (was: Re: [Repeater-Builder] Coax length, etc.) On Aug 15, 2010, at 7:06 AM, Jeff DePolo wrote: Whoever said time is money was an idiot. Time is worth inifinitely times more than money. You can make more money. You can even borrow money. Hell, if you were desparate you could even steal money. You can't do any of those things with time. Time is the one resource you can't make more of. With the passing of a loved-one in my family today, truer words could not be spoken. Money won't even buy an additional 5 minutes of idle chit-chat with someone you care about. I'll jump back into the conversation later... family's already on the way here and it's going to be a busy rest of the week. My wife and I are supposed to sing at the funeral, and I'm a pall-bearer. Didn't want you to think I'd disappeared on you Jeff. Appreciate the TIME you took to share your experiences with PAs. Won't have any time to respond with my thoughts for a little while, though. Best Regards, -- Nate Duehr, WY0X n...@natetech.com
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] Motorola Manuals
The manuals have been spoken for. Jamey Wright WR4JW From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Jamey Wright Sent: Monday, August 16, 2010 7:16 PM To: 'Repeater-Builder@yahoogroups.com' Subject: [Repeater-Builder] Motorola Manuals I have the following Motorola Manuals that are free to a good home. You just pay the postage on them. 68P81064E35-A Maxar 50 440-470 MHz 68P81025E70-B Maxar 150.8-174 MHz 68P81044E05-A Maxar 150.8-174 MHz 50 Watt Version 68P81038E05-B Maxar 80 29.7-50 MHz 68P81037E95-C Maxar 80 136-174 MHz 2/25/55 Watts Jamey Wright WR4JW inline: image001.jpg
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
[Repeater-Builder] VHF Combiner and other wanted
Hello group We are still looking for a 4 channel combiner VHF - 125 w per channel - prefer Cellwave or similar. Also need a 8 channel reciever multicoupler ( amp + PS etc. ) We buy or trade TNX Ed K9QPJ
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?
[Repeater-Builder] Re: Tait T-555 UHF Repeater
Mike, Mobiles by their nature don't make good Repeaters, They are usually low duty cycle, so need to be set for lower power or force cooled. Something like the T555 is 25Watts but at 33% duty cycle, that is 1 minute TX and 2 minutes RX. The hole in the back suggest sonething connected, but could have been for telemetry, data etc. The T555 can be trunking T555-81 or 91 others are conventional. For frequency if the diode link is open add frequencies as below. Diode coding is: Diode MHz N9 409.6 N8 204.8 N7 102.4 N6 51.2 N5 25.6 N4 12.8 N3 6.4 N2 3.2 N1 1.6 N0 0.800 A5 0.400 A4 0.200 A3 0.100 A2 0.050 A1 0.025 A0 0.0125 niteviser --- In Repeater-Builder@yahoogroups.com, Floydiboy007 floydi...@... wrote: Hi all. This is my first on this group.Better late than never. Is there anyone out there that may have had something to do with building a UHF PRS repeater from the above radios. I have two of them and I think that before I bought them they may have already been in a repeater config. I was curious as to setting frequencies on these with the diode matrix and worked out the frequencies these were set on and a couple of small holes drilled through the heatsink.. Any help would be great.. CheersMike
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
