Re: [Repeater-Builder] Coax length
Hi Kevin and all who responded to my question. Thank you, good info in the link provided by Kevin along with other interesting guidelines. More for the file. Regards, Doug - GM7SVK On 04/08/2010 11:04 PM, Kevin Custer wrote: Doug Hutchison wrote: Does the length of coax connecting cable between repeater and filters matter? Yes - and no. Please read the note about cabling lengths between the repeater and the duplexer in the section on page 4 of the following document: http://www.repeater-builder.com/wacom/wp6xx-vhf-tuning-instructions-remec.pdf Watch for word wrap... Kevin Custer Yahoo! Groups Links
Re: [Repeater-Builder] Mastr II Mobile Repeater?
I have a lot of thanking to do. Thank you to everyone here who provided their two cents, feedback, memories and thoughts on this RCC Unit. Big thanks to Eric for the link to the Comb breakdown, I have printed it out and added it to my bench clipboard. To you lot - let me know if I can repay the favor. I owe you! Cheers! John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202 http://tinyurl.com/2dtngmn - Original Message - From: Eric Lemmon To: Repeater-Builder@yahoogroups.com Sent: Wednesday, August 04, 2010 9:31 PM Subject: RE: [Repeater-Builder] Mastr II Mobile Repeater? John, The unit is a full-duplex RCC (Radiotelephone Common Carrier) mobile telephone, not a repeater. The breakdown of the Combination Number, and a complete list of all LBIs that apply to that radio are found in Publication Index PC18, here: www.repeater-builder.com/ge/product-code-indexes/index-pc18-mastr-exec-ii-r cc-and-imts-mobiles.pdf 73, Eric Lemmon WB6FLY -Original Message- Quoting La Rue Communications laruec...@gmail.com mailto:LaRueComm%40gmail.com : Gentlemen (And Ladies) I have a MASTR II Exec mobile here, I think its a UHF Repeater. I want to confirm with you - but I am curious what RCC stands for. Comb number YS55SSXX88A. Nothing comes up on Google and not sure which Comb spec sheet to look this up with Hall Electronics or here on RB Archives. Thanks for your input! John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202
Re: [Repeater-Builder] Coax length, etc.
Thanks, guys, a good topic and one that always seems to come up. And it sparks more questions and comments, of course. The cable length issue is a brother to if you don't like your VSWR, change the point along the transmission line where you're measuring it. By changing the length of the line, we're creating a transmission line transformer (a good thing) but we're limited by its length (not so good). It seems to me the mentioned circulator/isolator at the output of the xmtr is a better fix, as reflections coming back from the duplexer is absorbed by the circulator's load, the xmtr is generally happy, and we're no longer limited where we can put things in a rack or elsewhere. For amateurs, coming up with usable VHF circulators seems to be difficult and usually expensive, and coax always seems to be cheaper. Has anyone had luck finding a source for reasonbly priced VHF circulators, or success in rolling their own? Also, I noted in the pamphlet Kevin referenced that the unused duplexer port was left open (Figs. 1 2). I guess if the isolation is already greater than the load's return loss, it doesn't matter, at least at the reject frequency. But it seems to me one could possibly create problems for oneself by not terminating the unused open port. Just a thought. Maybe I work better knowing there's a load there. ;-) Your comments, please. 73, Russ WB8ZCC On 8/5/2010 10:19 AM, Doug Hutchison wrote: Hi Kevin and all who responded to my question. Thank you, good info in the link provided by Kevin along with other interesting guidelines. More for the file. Regards, Doug - GM7SVK On 04/08/2010 11:04 PM, Kevin Custer wrote: Doug Hutchison wrote: Does the length of coax connecting cable between repeater and filters matter? Yes - and no. Please read the note about cabling lengths between the repeater and the duplexer in the section on page 4 of the following document: http://www.repeater-builder.com/wacom/wp6xx-vhf-tuning-instructions-remec.pdf Watch for word wrap... Kevin Custer Yahoo! Groups Links
[Repeater-Builder] RE:Mastr II drift problem
I was told that I should be using 5C for receive and transmit but the 5C will NOT fit on my PLL exciter. Any ideas? Steve W4SEF
RE: [Repeater-Builder] RE:Mastr II drift problem
There are 5C elements made for that exciter. you just do not have one.. From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of steve Sent: Thursday, August 05, 2010 1:01 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] RE:Mastr II drift problem I was told that I should be using 5C for receive and transmit but the 5C will NOT fit on my PLL exciter. Any ideas? Steve W4SEF
[Repeater-Builder] Polyphaser EOL ?
Hi folks, We noticed reduced sensitivity at one of our remote receivers recently. Went out to check things. All looked good. SWR to the receive antenna was good. Check it with and w/o Polyphaser in line. Replaced Polyphaser and tested again. same SWR but sensitivity much improved. Is this typical for a Polyphaser that has reached EOL? 73, Dave Wa3gin
Re: [Repeater-Builder] Coax length, etc.
Russ Hines wrote: Thanks, guys, a good topic and one that always seems to come up. And it sparks more questions and comments, of course. The cable length issue is a brother to if you don't like your VSWR, change the point along the transmission line where you're measuring it. By changing the length of the line, we're creating a transmission line transformer (a good thing) but we're limited by its length (not so good). It seems to me the mentioned circulator/isolator at the output of the xmtr is a better fix, as reflections coming back from the duplexer is absorbed by the circulator's load, the xmtr is generally happy, and we're no longer limited where we can put things in a rack or elsewhere. For amateurs, coming up with usable VHF circulators seems to be difficult and usually expensive, and coax always seems to be cheaper. Has anyone had luck finding a source for reasonbly priced VHF circulators, or success in rolling their own? Also, I noted in the pamphlet Kevin referenced that the unused duplexer port was left open (Figs. 1 2). I guess if the isolation is already greater than the load's return loss, it doesn't matter, at least at the reject frequency. But it seems to me one could possibly create problems for oneself by not terminating the unused open port. Just a thought. Maybe I work better knowing there's a load there. ;-) Your comments, please. 73, Russ WB8ZCC I think we all agree that a real impedance matching device is the best approach, but hams (generally speaking) are cheap. Many will spend two days hacking on a piece of RG-214 before spending fifty or a hundred bucks on a different (better?) solution. Allan Crites and I are currently in discussion which will be used as the basis of a RB web article that will explain exactly what is happening, why it happens, and why an 'optimized' cable length can be used to transfer power ending up with the stated loss of the duplexer and have little reflected power toward the transmitter - so long as the duplexer is tuned properly and exhibits good return loss on the frequency it's designed to pass. Kevin Custer
Re: [Repeater-Builder] Coax length, etc.
Thanks for the reply, Kevin. I'm looking forward to seeing the article. 73, Russ WB8ZCC On 8/5/2010 1:20 PM, Kevin Custer wrote: Russ Hines wrote: Thanks, guys, a good topic and one that always seems to come up. And it sparks more questions and comments, of course. The cable length issue is a brother to if you don't like your VSWR, change the point along the transmission line where you're measuring it. By changing the length of the line, we're creating a transmission line transformer (a good thing) but we're limited by its length (not so good). It seems to me the mentioned circulator/isolator at the output of the xmtr is a better fix, as reflections coming back from the duplexer is absorbed by the circulator's load, the xmtr is generally happy, and we're no longer limited where we can put things in a rack or elsewhere. For amateurs, coming up with usable VHF circulators seems to be difficult and usually expensive, and coax always seems to be cheaper. Has anyone had luck finding a source for reasonbly priced VHF circulators, or success in rolling their own? Also, I noted in the pamphlet Kevin referenced that the unused duplexer port was left open (Figs. 1 2). I guess if the isolation is already greater than the load's return loss, it doesn't matter, at least at the reject frequency. But it seems to me one could possibly create problems for oneself by not terminating the unused open port. Just a thought. Maybe I work better knowing there's a load there. ;-) Your comments, please. 73, Russ WB8ZCC I think we all agree that a real impedance matching device is the best approach, but hams (generally speaking) are cheap. Many will spend two days hacking on a piece of RG-214 before spending fifty or a hundred bucks on a different (better?) solution. Allan Crites and I are currently in discussion which will be used as the basis of a RB web article that will explain exactly what is happening, why it happens, and why an 'optimized' cable length can be used to transfer power ending up with the stated loss of the duplexer and have little reflected power toward the transmitter - so long as the duplexer is tuned properly and exhibits good return loss on the frequency it's designed to pass. Kevin Custer
RE: [Repeater-Builder] Polyphaser EOL ?
Usually the SWR goes up,when the Polyphaser reaches it's EOL, as well as reduced receive. 73 Dan KF8DB To: Repeater-Builder@yahoogroups.com From: wa3...@comcast.net Date: Thu, 5 Aug 2010 13:14:28 -0400 Subject: [Repeater-Builder] Polyphaser EOL ? Hi folks, We noticed reduced sensitivity at one of our remote receivers recently. Went out to check things. All looked good. SWR to the receive antenna was good. Check it with and w/o Polyphaser in line. Replaced Polyphaser and tested again… same SWR but sensitivity much improved. Is this typical for a Polyphaser that has reached EOL? 73, Dave Wa3gin
Re: [Repeater-Builder] RE:Mastr II drift problem
At 10:00 AM 08/05/10, you wrote: I was told that I should be using 5C for receive and transmit but the 5C will NOT fit on my PLL exciter. Any ideas? Steve W4SEF See this article http://www.repeater-builder.com/ge/m2icoms.html It has photos of the EC, 5C and 2C wide and narrow ICOMs. You apparently have a wide EC transmit and a narrow receive element. The EC is a slave element, and the 5C is a master. The 2C and 1C stand alone - they do not receive or generate the compensation voltage. Without a 5C in the transmitter, the compensation line in your transmitter is floating and as such the transmitter is drifting. As I see it you can do one of three things: 1) Jumper the receive compensation line over to the transmitter. This slaves your EC to the 5C in the receiver. This is quick, cheap and will work. If you have a high RF level at your site (like at a busy 2-way site or at a TV station transmit site), then use a small coax like RG174 as the jumper and ground the shield to an adjacent ground pin.. 2) Get a wide 5C (on ANY frequency) and stuff into an open element connector in the transmitter. You DON'T add a jumper to enable the element, just plug it in. It's only use is as a compensation voltage generator (as the master to the EC slave). 3) The most expensive, but the right way, would be to get a wide 2C element and have International rock it up on your frequency, then replace the EC with the 2C. All of this is covered in that article. Mike WA6ILQ
[Repeater-Builder] Coaxial Relay
To All: I am still trying to locate a Coaxial Relay with a 12 vdc coil and either N or UHF connectors. Please contact me off net if you have one available. Many Thanks. Fred seamansfh at sbcglobal dot net
Re: [Repeater-Builder] Polyphaser EOL ?
Check that Polyphasor with an ohmeter, I'll bet you find a short or resistance from center to shield. Had one go out once, poor RX on a base station was the complaint. Found high VSWR. Polyphasor showed dead short from center to shield. Cracked the housing apart (with a cold chisel) and marveled at the construction. (:-'( It's nothing more than a gas tube across the coax line. Milt N3LTQ - Original Message - From: David Jordan To: Repeater-Builder@yahoogroups.com Sent: Thursday, August 05, 2010 1:14 PM Subject: [Repeater-Builder] Polyphaser EOL ? Hi folks, We noticed reduced sensitivity at one of our remote receivers recently. Went out to check things. All looked good. SWR to the receive antenna was good. Check it with and w/o Polyphaser in line. Replaced Polyphaser and tested again. same SWR but sensitivity much improved. Is this typical for a Polyphaser that has reached EOL? 73, Dave Wa3gin
[Repeater-Builder] Re: Coaxial Relay
http://www.surplussales.com/Relays/rfcoaxialrelays/rfcoax_n.html --- In Repeater-Builder@yahoogroups.com, Fred Seamans seaman...@... wrote: To All: I am still trying to locate a Coaxial Relay with a 12 vdc coil and either N or UHF connectors. Please contact me off net if you have one available. Many Thanks. Fred seamansfh at sbcglobal dot net
Re: [Repeater-Builder] Polyphaser EOL ?
Thanks I'll do that ... Original Message: - From: Milt men...@pa.net Date: Thu, 5 Aug 2010 16:50:38 -0400 To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Polyphaser EOL ? Check that Polyphasor with an ohmeter, I'll bet you find a short or resistance from center to shield. Had one go out once, poor RX on a base station was the complaint. Found high VSWR. Polyphasor showed dead short from center to shield. Cracked the housing apart (with a cold chisel) and marveled at the construction. (:-'( It's nothing more than a gas tube across the coax line. Milt N3LTQ - Original Message - From: David Jordan To: Repeater-Builder@yahoogroups.com Sent: Thursday, August 05, 2010 1:14 PM Subject: [Repeater-Builder] Polyphaser EOL ? Hi folks, We noticed reduced sensitivity at one of our remote receivers recently. Went out to check things. All looked good. SWR to the receive antenna was good. Check it with and w/o Polyphaser in line. Replaced Polyphaser and tested again. same SWR but sensitivity much improved. Is this typical for a Polyphaser that has reached EOL? 73, Dave Wa3gin mail2web - Check your email from the web at http://link.mail2web.com/mail2web
[Repeater-Builder] Re: DSP404 beta 5.18 released
Good detective work, Stan and Tim! Yes, V5.18 exists and is ready for testing. I was doing a bit more testing and finishing the documentation (at the link you found, quoted below) before I officially released it for testing. It looks you you have already tried it out, so we are ahead of the game :) Actually, we usually release in several stages: internal test, to customers with special test cases, alpha, beta and general release. We have finished the first two and I just posted a release message to the alpha-testers list at http://groups.yahoo.com/group/RLC-DSP404-alpha-testers/. If you want to get in on early testing of new versions (which are likely to have bugs), feel free to sign up there. That is also the best place to discuss problems with alpha software. If alpha testing goes well, we then announce a beta release on the main DSP404 discussion list at http://groups.yahoo.com/group/RLC-DSP404/. That list has a lot more members and we try to keep the traffic low and relevant (it is moderated). If beta testing goes well, we do a general release, which triggers an automatic update offer in RCI (the Windows management software). Steve --- In Repeater-Builder@yahoogroups.com, Tim - WD6AWP tisaw...@... wrote: I found what looks like unfinished release notes on the Wiki here: http://linkcomm.com/wiki/index.php?title=DSP4_V5.18_Changes [snip]
Re: [Repeater-Builder] Dissasembly of msr 2000 continuous duty amp. How?
Sucess! I completely cleaned and re tinned my Weller 8100 tip, added some solder, and got heat transfer to pop it up. I was not aware of the fish paper that the wires came thru. Now to troubleshoot the amp. It probably has some blown transistors as well as the cooked caps and 12 ohm resistors across some of the finals. We do have a Motorola test set, I have done component level work in the past, but this is out of my league. Kevin, I may take you up on your offer for further help. Thanks to all who responded. 73, Marty In a message dated 8/2/2010 8:29:32 P.M. Eastern Daylight Time, kug...@kuggie.com writes: _radi...@aol.rad_ (mailto:radi...@aol.com) wrote: OK Kevin, I had already tried the desoldering with a really good Pace unit, but the heat did not transfer well. I will get a buddy to help and use my Weller guns. I have a big 250 watt one here somewhere. Marty Let us know how you make out - or, if you need more help... Kevin
Re: [Repeater-Builder] Dissasembly of msr 2000 continuous duty amp. How?
Why has no one suggested replacing the guts of this beast with a Mitrek PA? radi...@aol.com wrote: Sucess! I completely cleaned and re tinned my Weller 8100 tip, added some solder, and got heat transfer to pop it up. I was not aware of the fish paper that the wires came thru. Now to troubleshoot the amp. It probably has some blown transistors as well as the cooked caps and 12 ohm resistors across some of the finals. We do have a Motorola test set, I have done component level work in the past, but this is out of my league. Kevin, I may take you up on your offer for further help. Thanks to all who responded. 73, Marty In a message dated 8/2/2010 8:29:32 P.M. Eastern Daylight Time, kug...@kuggie.com writes: radi...@aol.com wrote: OK Kevin, I had already tried the desoldering with a really good Pace unit, but the heat did not transfer well. I will get a buddy to help and use my Weller guns. I have a big 250 watt one here somewhere. Marty Let us know how you make out - or, if you need more help... Kevin
Re: [Repeater-Builder] Thru-Line Power Sensor?
Speaking of power sensors, I have one of each of the following. DB Products DB8885A-350. 100-325 mHz 350 watts Telewave PM-2AQ-300 - 100-300 mHz 5 - 1000 watts I would like to trade ONE OF THEM for one covering 400 - 500 (UHF ham band of course). Ken -- President and CTO - Arcom Communications Makers of repeater controllers and accessories. http://www.arcomcontrollers.com/ Authorized Dealers for Kenwood and Telewave and we offer complete repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net We don't just make 'em. We use 'em!
[Repeater-Builder] WTD repeater contollers
Greetings, our 501(c)3 club is looking to update our repeater controllers. Before we place orders with the vendors, I thought I would troll here to see what might be available on the used market I'm on the hunt for one of the combinations described below. We have more than 3 repeaters and links to tie together across two sites. Please reply off list to me via w5jr.li...@att.net with what you have, condition and price. A - 2 each NHRC-4 and an RC-210 w/rack panel B - 2 each NHRC-4 and an Scom 7330 w/rack panel C - 2 each Arcom RC-210 in rack panels and an NHRC-4 D - 2 each Scom 7330 in rack panels and an NHRC-4 Thanks Mike W5JR North Fulton Amateur Radio League 2010 Dayton Club of the Year www.nfarl.org
