Re: [Repeater-Builder] Re: Micor PA schematic / Power Control Board
There were 100 watt Micor PA's on VHF, not UHF. At UHF the Micor PA was only rated for 75 watts. -- Original Message -- --- In Repeater-Builder@yahoogroups.com, Gary Glaenzer glaenzer@ wrote: there is no 100 watt Micor amp without qualifiers, that is a pretty broad statement Gary - Original Message - From: Captainlance To: Repeater-Builder@yahoogroups.com Sent: Thursday, October 30, 2008 10:11 AM Subject: Re: [Repeater-Builder] Micor PA schematic / Power Control Board The PA is only factory rated at 78 watts...there is no 100 watt Micor amp. Some however, will do 100... Lance N2HBA - Original Message - From: georgiaskywarn To: Repeater-Builder@yahoogroups.com Sent: Thursday, October 30, 2008 5:44 AM Subject: [Repeater-Builder] Micor PA schematic / Power Control Board Anybody have a schematic for the Micor 100watt PA? Also can only get about 78 watts out of this thing. Have changed out the power control board...either board the power doesn't go up or down. Ideas? Haven't tried this yet; http://www.hamrepeater.org/micr_uhf.htm (bottom of the page to defeat this portion) but am going to try it tonight. Thanks, Robert KD4YDC -- No virus found in this incoming message. Checked by AVG - http://www.avg.com Version: 8.0.175 / Virus Database: 270.8.5/1755 - Release Date: 10/29/2008 5:27 PM -- No virus found in this incoming message. Checked by AVG - http://www.avg.com Version: 8.0.175 / Virus Database: 270.8.5/1755 - Release Date: 10/29/2008 5:27 PM
[Repeater-Builder] Re: 2-in-one antenna for UHF repeater?
Jsn, you can do just fine with two good antennas with good quality feedline with as little as 10 feet of vertical separation at 5 mhz frequency spacing. A quick look at the chart within the ARRL FM Repeaters Handbook shows that you can achieve 75db of isolation with just 20 feet of vertical separation at 450mhz, more than enough for duplex operation. I personally have built UHF systems which use two antennas with close spacing and they all show no significant desense and work just fine. 20-30 watts is a good power level for this. - Darrell/KA7BTV
Re: [Repeater-Builder] Re: 2-in-one antenna for UHF repeater?
I can vouch for this statement.. Our Club has set up a UHF rptr with 5M vertical separation using a Philips FM815 (40W) and dual feedlines (LDF4-50), the other feedline feeds the TX ant. The only filter is a small helical on the RX. 73 John VK4JKL On 31/10/2008 4:58:14 PM, jistabout ([EMAIL PROTECTED]) wrote: Jsn, you can do just fine with two good antennas with good quality feedline with as little as 10 feet of vertical separation at 5 mhz frequency spacing. A quick look at the chart within the ARRL FM Repeaters Handbook shows that you can achieve 75db of isolation with just 20 feet of vertical separation at 450mhz, more than enough for duplex operation. I personally have built UHF systems which use two antennas with close spacing and they all show no significant desense and work just fine. 20-30
[Repeater-Builder] Re: Broken Rock MT. tower collapse
Look like the Aerial AV1312-1 air band dipole (118-136 MHz) to me. http://www.aerial.fi/ep/tiedostot/aerial_vhf.pdf regards, ---per --- In Repeater-Builder@yahoogroups.com, Jacob Suter [EMAIL PROTECTED] wrote: I'm guessing that'd be the national weather service transmitter at 162 MHz. Close enough to look like FM broadcast, but the ridiculous power requirements aren't there. The NWS site north of me uses antennas that resemble slightly smaller FM transmitter 'loops'. FM commercial stations use very good antennas to save money on transmitters and electricity. The NWS has your tax dollars to spend! Of course, being that the NWS is only generally looking for 1-5kW EIRP, it may be cheaper to lease less tower space and throw on a slightly hotter transmitter. JS -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:Repeater- [EMAIL PROTECTED] On Behalf Of neal Newman Sent: Wednesday, October 29, 2008 7:59 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Broken Rock MT. tower collapse looking at the Pictures YEP an FM went off the air.. Must have been a Non Com based on the Type of antenna I only see 2 bays
Re: [Repeater-Builder] Re: Micor PA schematic / Power Control Board
As I recall you are correct - 75-watt was UHF Chuck WB2EDV - Original Message - From: JOHN MACKEY [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Friday, October 31, 2008 2:23 AM Subject: Re: [Repeater-Builder] Re: Micor PA schematic / Power Control Board There were 100 watt Micor PA's on VHF, not UHF. At UHF the Micor PA was only rated for 75 watts.
RE: [Repeater-Builder] Broken Rock MT. tower collapse
Nah I have a NOAA station Running 1 kw at one of my sites. they are NOT running on a 2 bay that looks like an FM. It actually looks like a DB products repeater antenna with folded loops on 162.*** That 2 Bay on top of that collapsed tower is for an FM station or Translator. what is the Lat and Long of that collapsed tower I want to look it up.. Neal NWS *does* use broadcast-type antennas, both Vpol and Cpol, at some sites. I've seen SWR/Jampro crossed V's, and PSI vertical folded dipoles. Other sites, mostly older ones, I've seen using DB224/DB264's. Most of the sites that went in fairly recently are running either Crown or Armstrong transmitters and broadcast-grade antennas. --- Jeff WN3A
Re: [Repeater-Builder] Broken Rock MT. tower collapse
Some are running an extra-heavy duty version from Sinclair. At least that's what I was told by one of the tower climbers. Chuck WB2EDV - Original Message - From: Jeff DePolo [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Friday, October 31, 2008 10:27 AM Subject: RE: [Repeater-Builder] Broken Rock MT. tower collapse Nah I have a NOAA station Running 1 kw at one of my sites. they are NOT running on a 2 bay that looks like an FM. It actually looks like a DB products repeater antenna with folded loops on 162.*** That 2 Bay on top of that collapsed tower is for an FM station or Translator. what is the Lat and Long of that collapsed tower I want to look it up.. Neal NWS *does* use broadcast-type antennas, both Vpol and Cpol, at some sites. I've seen SWR/Jampro crossed V's, and PSI vertical folded dipoles. Other sites, mostly older ones, I've seen using DB224/DB264's. Most of the sites that went in fairly recently are running either Crown or Armstrong transmitters and broadcast-grade antennas. --- Jeff WN3A
RE: [Repeater-Builder] Broken Rock MT. tower collapse
Neal, The Broken Rock Mountain site is at 34-32-08.2 N and 93-26-01.7 W on the NAD83 datum. It is a mile or so southeast of Joplin, Arkansas, in Montgomery County, and at an elevation of about 400m AMSL. Cellular station KNKN495 is at that location. There are over 200 licensees shown in the FCC records at or near that location, but not all of them are active. Curiously, I found no mention of a recent tower collapse in the local (Mount Ida) media. -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Jeff DePolo Sent: Friday, October 31, 2008 7:28 AM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Broken Rock MT. tower collapse snip What is the Lat and Long of that collapsed tower? I want to look it up. Neal
Re: [Repeater-Builder] Re: Micor PA schematic / Power Control Board
That was the rating from Motorola... but they were often-times good for a bit more. In fact, that Community Repeater I just rebuilt from scratch had a 75W PA, and I got just under 100 out of it when I fired it up. Of course, I dialed it down to 50 to keep it legal for GMRS. Mark - N9WYS / WQIV271 --- On Fri, 10/31/08, Chuck Kelsey [EMAIL PROTECTED] wrote: From: Chuck Kelsey [EMAIL PROTECTED] Subject: Re: [Repeater-Builder] Re: Micor PA schematic / Power Control Board To: Repeater-Builder@yahoogroups.com Date: Friday, October 31, 2008, 7:51 AM As I recall you are correct - 75-watt was UHF Chuck WB2EDV - Original Message - From: JOHN MACKEY [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Friday, October 31, 2008 2:23 AM Subject: Re: [Repeater-Builder] Re: Micor PA schematic / Power Control Board There were 100 watt Micor PA's on VHF, not UHF. At UHF the Micor PA was only rated for 75 watts. Yahoo! Groups Links
Re: [Repeater-Builder] Broken Rock MT. tower collapse
I was wondering the same thing as a media search resulted in nothing. Chuck WB2EDV - Original Message - From: Eric Lemmon [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Friday, October 31, 2008 12:27 PM Subject: RE: [Repeater-Builder] Broken Rock MT. tower collapse Neal, The Broken Rock Mountain site is at 34-32-08.2 N and 93-26-01.7 W on the NAD83 datum. It is a mile or so southeast of Joplin, Arkansas, in Montgomery County, and at an elevation of about 400m AMSL. Cellular station KNKN495 is at that location. There are over 200 licensees shown in the FCC records at or near that location, but not all of them are active. Curiously, I found no mention of a recent tower collapse in the local (Mount Ida) media.
Re: [Repeater-Builder] Re: Micor PA schematic / Power Control Board
Heh-I've heard that if you take the harmonic filter out of a UHF Mitrek, it'll do over 200. But of course, 1) it won't do it long, 2) a lot of that is on the second harmonic. Just because it will do it, doesn't mean you should ;c)) Mark Tomany wrote: That was the rating from Motorola... but they were often-times good for a bit more. In fact, that Community Repeater I just rebuilt from scratch had a 75W PA, and I got just under 100 out of it when I fired it up. Of course, I dialed it down to 50 to keep it legal for GMRS. Mark - N9WYS / WQIV271 --- On Fri, 10/31/08, Chuck Kelsey [EMAIL PROTECTED] wrote: From: Chuck Kelsey [EMAIL PROTECTED] Subject: Re: [Repeater-Builder] Re: Micor PA schematic / Power Control Board To: Repeater-Builder@yahoogroups.com Date: Friday, October 31, 2008, 7:51 AM As I recall you are correct - 75-watt was UHF Chuck WB2EDV - Original Message - From: JOHN MACKEY [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Friday, October 31, 2008 2:23 AM Subject: Re: [Repeater-Builder] Re: Micor PA schematic / Power Control Board There were 100 watt Micor PA's on VHF, not UHF. At UHF the Micor PA was only rated for 75 watts.
[Repeater-Builder] wanted: KLN6709 141.3Hz 4A reeds
Wanted: Motorola KLN6709 141.3Hz 4A reeds. The more the better. Need 6709s. Have plenty of the others. Have other tones to trade also. Eric KE2D
[Repeater-Builder] seting up a motorola repeater out of 2 gm340 radio.
Hello All, can anyone help me with infor on how to setup the gm340 radio to a repeater ,? i just can seem to have audio on my field radio after the setup . i used the same setup i usually use on the moorola gm140/160 cm140/cm300 / gm300 etc. but still can,t get audio out on the field radio . am i missing something .? pls help. thanks regards savy
Re: [Repeater-Builder] Re: 2-in-one antenna for UHF repeater?
This is encouraging. My second radio hasn't arrived yet, but I will definitely build 2 dipoles 20 feet apart just to see how well it works. I am building a portable GMRS repeater for use in the remote woods. GMRS limits you to a 20 foot antenna, so I could have the Rx at 20 feet, and the Tx at ground level which will probably be a vehicle roof most of the time. According to the chart here (http://www.repeater-builder.com/antenna/separation.html) 20 feet would give me 55-60dB of isolation (but the chart doesn't seem to specify the offset, which is weird). What would be considered a minimum usable dB figure for isolation? I will probably only be running 10W or so. John, can you (or anyone listening) provide a pointer to information on the helical you mention below? Is it possible to add to the isolation between antennas using some sort of electronic filter that is more easily buildable than a full scale duplexer? Can you do any good with capacitors and toroidal or air core inductors? I'm also not afraid of soldering up a bunch of copper tubing or whatever if that is what it takes :) Thank you all for your help. I appreciate your willingness to help an overt newbie :) I am making my way through the wealth of information on the repeater builder site, which is an amazing resource. jsn On Fri, Oct 31, 2008 at 1:14 AM, jgielis [EMAIL PROTECTED] wrote: I can vouch for this statement.. Our Club has set up a UHF rptr with 5M vertical separation using a Philips FM815 (40W) and dual feedlines (LDF4-50), the other feedline feeds the TX ant. The only filter is a small helical on the RX. 73 John VK4JKL On 31/10/2008 4:58:14 PM, jistabout ([EMAIL PROTECTED]) wrote: Jsn, you can do just fine with two good antennas with good quality feedline with as little as 10 feet of vertical separation at 5 mhz frequency spacing. A quick look at the chart within the ARRL FM Repeaters Handbook shows that you can achieve 75db of isolation with just 20 feet of vertical separation at 450mhz, more than enough for duplex operation. I personally have built UHF systems which use two antennas with close spacing and they all show no significant desense and work just fine. 20-30
Re: [Repeater-Builder] 2-in-one antenna for UHF repeater?
Ouch. I wasn't aware that much separation was needed. My application is for short term use in portable situations, and a 120' tower is completely out of the question. I guess I'll continue to troll eBay for duplexers. Thank you for the reality check. jsn On Thu, Oct 30, 2008 at 3:01 PM, David Piche [EMAIL PROTECTED] wrote: Well Depending on how much power you will be using, you are looking to need at least 120' of direct vertical separation between the antennas which the RX antenna needs to be on the top and the tx on the bottom, and even then, your still talking about 65 dB of isolation in the best of conditions at 5 MHz separation. So quite frankly, no a good idea for everyday use. From: boozhoundlabs [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Thursday, October 30, 2008 3:09:48 PM Subject: [Repeater-Builder] 2-in-one antenna for UHF repeater? I am building an inexpensive UHF repeater. Rather than spend money on a duplexer, I am considering using 2 antennas. I have had good luck building small dipoles, and would like to build a collinear pair of vertical dipoles in a single PVC housing for send and receive. I am considering building the dipoles out of 1/2 copper with RG-58 running inside, and the whole thing sealed inside PVC pipe. As for the actual configuration of the antenna, I am still brainstorming options, and would appreciate help and experience narrowing things down. What would be the best spacing for a pair of dipoles in this collinear configuration? I would like to minimize interaction between them, or perhaps even provide gain based on their interaction. Any ideas how to adapt a design like the one below to dual-antenna configuration: http://www.repeater -builder. com/antenna/ wa6svt.html Can the part of the antenna connected to the coax braid be shared between antennas, with one ungrounded quarter wave section for Rx and Tx above and below? It would also be neat to have the Rx antenna be of higher gain than the Tx antenna since this will likely be used primarily by handhelds. Any suggestions of ways to do this? I am considering extending the Rx dipole with several 1/2 wave center-to-braid sections of coax as in most gain-ful collinear antennas. Thanks, jsn
Re: [Repeater-Builder] 2-in-one antenna for UHF repeater?
I found these on ebay, they might could be made to work for what you need. http://cgi.ebay.com/Motorola-UHF-Mobile-Duplexer-430-470-Mhz-BNC-connector_W0QQitemZ220304146797QQcmdZViewItem?hash=item220304146797_trkparms=39%3A1|66%3A2|65%3A10|240%3A1318_trksid=p3286.c0.m14 Thank you 73 Kenny KG5KS DEC B AR From: jsn [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Thursday, October 30, 2008 3:18:05 PM Subject: Re: [Repeater-Builder] 2-in-one antenna for UHF repeater? Ouch. I wasn't aware that much separation was needed. My application is for short term use in portable situations, and a 120' tower is completely out of the question. I guess I'll continue to troll eBay for duplexers. Thank you for the reality check. jsn On Thu, Oct 30, 2008 at 3:01 PM, David Piche [EMAIL PROTECTED] com wrote: Well Depending on how much power you will be using, you are looking to need at least 120' of direct vertical separation between the antennas which the RX antenna needs to be on the top and the tx on the bottom, and even then, your still talking about 65 dB of isolation in the best of conditions at 5 MHz separation. So quite frankly, no a good idea for everyday use. _ _ __ From: boozhoundlabs [EMAIL PROTECTED] com To: Repeater-Builder@ yahoogroups. com Sent: Thursday, October 30, 2008 3:09:48 PM Subject: [Repeater-Builder] 2-in-one antenna for UHF repeater? I am building an inexpensive UHF repeater. Rather than spend money on a duplexer, I am considering using 2 antennas. I have had good luck building small dipoles, and would like to build a collinear pair of vertical dipoles in a single PVC housing for send and receive. I am considering building the dipoles out of 1/2 copper with RG-58 running inside, and the whole thing sealed inside PVC pipe. As for the actual configuration of the antenna, I am still brainstorming options, and would appreciate help and experience narrowing things down. What would be the best spacing for a pair of dipoles in this collinear configuration? I would like to minimize interaction between them, or perhaps even provide gain based on their interaction. Any ideas how to adapt a design like the one below to dual-antenna configuration: http://www.repeater -builder. com/antenna/ wa6svt.html Can the part of the antenna connected to the coax braid be shared between antennas, with one ungrounded quarter wave section for Rx and Tx above and below? It would also be neat to have the Rx antenna be of higher gain than the Tx antenna since this will likely be used primarily by handhelds. Any suggestions of ways to do this? I am considering extending the Rx dipole with several 1/2 wave center-to-braid sections of coax as in most gain-ful collinear antennas. Thanks, jsn
