Re: [Repeater-Builder] Coax length between added cavities
To All: Over the past 50 years I have worked with most all Cavity mfg's on special and standard product applications. Let me assure you that the interconnecting cables are critical. Some applications more so than others. Msg for Nate; Before you try shot-gunning the symptoms, please spend the needed time to identify the problem, then a cure can be better established. Yes, this will take more time, but it will be well worth it in the end! Fred W5VAY (Retired Engineer) - Original Message - From: [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Friday, July 27, 2007 12:03 AM Subject: [Repeater-Builder] Coax length between added cavities Can we wind our way back to addressing the original query which asked if there is a critical length for the interconnect between a BP BR duplexer and added pure pass cavities? I can't speak for all bottle manufacturers, but I own 8 Wacom BP BR duplexer + pass cavity arrays some of which go back to the early eighties. Lloyd Alcorn was kind enough and patient enough to give me a pretty good nuts and bolts education on cavity characteristics. He said in no uncertain terms that there were optimum cable lengths for both the interconnects between the duplexer cavities and also an optimum length for any pure pass cavities added to the chain. For the added pure pass cavity, the optimum interconnect length would ensure that the pure pass curve would superimpose over the duplexer curve. When I did some experimenting with the pure pass cable length, it validated his point. If I significantly lengthened or shortened this cable, the tracking generator would indicate that the pass curve was no longer superimposed on the duplexer curve. It would either lead or lag the duplexer curve producing two results: 1) the composite curve began to show some distortion and 2) the total attenuation at the desired frequency was higher than when the optimum cable length (supplied by Lloyd) was used. So my take is that there are critical cable lengths involved for adding a pure pass cavity to a BP BR duplexer, but I would be interested to hear from anyone aboard who has the necessary hardware kicking around to repeat that experiment and either replicate or refute the results I got. As I said, my sole cavity experience has been with Wacoms, but I find it difficult to believe that this parameter is OEM specific. K7IJ -- Get a sneak peek of the all-new AOL.com.
Re: [Repeater-Builder] "old style" GE MASTR II VHF PA - transistor torque specifications
LBI 4593 has the PA Xistor torque spec of 8 Inch-pounds for the older style 100 watt PA Xistors. It is located under the maintenance portion of the PA Assembly (buried in the last paragraph). The list here for various size nuts is good information to have on hand. Fred W5VAY - Original Message - From: Nate Duehr To: Repeater-Builder@yahoogroups.com Sent: Monday, July 16, 2007 7:10 PM Subject: Re: [Repeater-Builder] "old style" GE MASTR II VHF PA - transistor torque specifications Butch Kanvick wrote: > Hi, Nate. > > I have a VHF PA sitting next to me and the sticker says: > > CAUTION > Tightening Torgues For Transistor Hardware > Must Be Adhered To > > 6 +- in/lbs for 4-40 hdw > 8 +- in/lbs for 8-32 hdw > 12 +-in/lbs for 10-32 hdw > > I have not seen it in the LBI's either. > > Butch, KE7FEL/r Thanks for the info, Butch. Yeah, that's the sticker on the newer-style ones. I have a couple here with that sticker on them too. I received this info off-list from a good source about the older ones: For a 1/4" stud use 5 +/-1 inch-pounds. For a 3/8" stud use 8 +/- 1 inch-pounds. For a 1/2" stud use 10 +/- 1 inch-pounds. Not much different, really...but not as tight as the newer ones. The smaller transistors must break easier, if I had to guess why they're lower. I thought I'd share in case anyone else is watching the thread for replies. 73, Nate WY0X
[Repeater-Builder] Motorola DC Power Supply
To All: Recently I purchased a Motorola DC Power Supply on EBAY. The seller sent me a model R1011AA supply along with a manual for a R1011B. Is there anyone out there with a manual for a model R1011AA Power Supply? I would like to get a copy of one if possible. Please respond directly to me. Many Thanks. Fred Seamans W5VAY
Re: [Repeater-Builder] Distance
There is a lot more that comes into consideration than height when you begin to predict the range and/or coverage. I would suggest that anybody wanting to make predictions of coverage obtain a copy of GE's DF-10003-1 "VHF and UHF Propagation". There are a lot of graphs, but It will help you get within 5 - 10 percent of your coverage. From a retired engineer, don't forget to include obstruction losses, buildings, trees, ground metal deposits, etc. Fred W5VAY - Original Message - From: [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Monday, March 26, 2007 6:29 PM Subject: Re: [Repeater-Builder] Distance That sounds about right to me Nate. I have a repeater with a low antenna (abt 65 ft) in the flatland around the Dallas area that does about 12 miles, so not a bad rule of thumb for that low antenna. But I also have a repeater with an antenna at about 300 ft in that area that does a lot better than the 27 or so miles the rule of thumb would suggest. More like about 35 miles to the best of my knowledge. So maybe the rule does not work all the time - (or the tower is taller than I think it is) 73 - Jim W5ZIT -Original Message- From: [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Mon, 26 Mar 2007 3:12 PM Subject: Re: [Repeater-Builder] Distance On 3/25/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > > > as far as range goes.. take the square root of the distance from the ground to the base of your antenna and multiply it by 1.5 and that would be your range higher mo better allen In what units, Allen? Didn't you have an obnoxious math or physics teacher holler at you about providing the proper units (or deriving them) for a particular problem in school? Distance from the ground to base of antenna in ... Feet? Inches? Miles? (that last one's a joke... but I can do it with a couple of repeaters here, if you count the mountain they're sitting on...) That will be your range in what... miles? Kilometers? Inches? Astronomical Units? Need to be a little more specific there to help him out... I did some fast numbers to try to figure out how your rule of thumb works... I decided to try the "tower" hight in feet... Assuming... A 5000' tower (mountain)... that gives a number of unknown units of 70.7106781. Multiply that by 1.5, you get... 106.06601715. So ... assuming the height WAS supposed to be given in feet, it would appear to me that the "answer" is in miles? 106 miles of coverage is the only thing even close to being in the ballpark for one of our mountaintop systems. I can tell the answer's not in Feet or AU's! (GRIN) Nate WY0X __ Check Out the new free AIM(R) Mail -- 2 GB of storage and industry-leading spam and email virus protection.
Re: [Repeater-Builder] Watch your use of the English Language here
To All: People who live in glass houses should not throw stones! Now back to technical topics. Fred W5VAY - Original Message - From: [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Saturday, March 24, 2007 1:14 PM Subject: Re: [Repeater-Builder] Watch your use of the English Language here Gary, the real pitty here is that you are a language cop that can't even spell pity. I myself think it's time for you to get a both a dictionary or a spell checker + a life! In a message dated 3/24/2007 10:57:23 A.M. Pacific Daylight Time, [EMAIL PROTECTED] writes: Begin forwarded message: From: Gary <[EMAIL PROTECTED]> Date: March 24, 2007 10:42:26 PDT To: Paul Metzger <[EMAIL PROTECTED]> Subject: Re: Power-Pole connectors NOT for power You know, it's not only a pitty but also ironic that you don't value our language more especially since you are involved with radio communications for crying out loud. Apparently you didn't listen to your elementary school teacher very well otherwise you may now realize how rediculously stupid you seem by attempting to simply dismiss your misuse of the language as being less important then (whatever you call) fun. I'm done and you've been enlighted. Goodbye. Paul Metzger wrote: Thank you for your concerns. But quite honestly, I feel as if I had just been scorned by an elementary school teacher. I guess my last e- mail might have offended you in some way. I apologize if I had. Now that that's out of the way . . . Have Fun ! Paul Metzger K6EH -- AOL now offers free email to everyone. Find out more about what's free from AOL at AOL.com.
Re: [Repeater-Builder] RF Sampler
Bird Also makes an external sampler, Model 4275, with a BNC connector on the side . This is rated 20 MHz to 1 GHz. Fred Seamans - Original Message - From: Fred Flowers To: Repeater-Builder@yahoogroups.com Sent: Thursday, March 15, 2007 9:34 PM Subject: RE: [Repeater-Builder] RF Sampler Also Bird makes a element that has a bnc connector. Fred N4GER -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Mike Morris WA6ILQ Sent: Thursday, March 15, 2007 9:33 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] RF Sampler At 06:05 PM 03/15/07, you wrote: >I have a Nice Coaxial Dynamics Wattmeter Like the bird and it uses the >same elements but nice Big Display for us older People. > >Anyway it is Made very Well and not much RF gets out , So the question >is How can I make Something get a sample Of RF enough for the >Freq Counter to read . I was thinking about drilling a hole and >putting a BNC connecter on it and inside just some type of small loop >of wire. Anyone who has done something like this and has any Ideas it >would be greatly appreciated, Just think the old heath Kit Cantenna >Oil Dummy Load had a RCA port on top and that was 50 Yrs ago I think >that was used for a Scope. To check the AM Signal. The Measurements >will mostly on VHF-UHF All the Way to 927 Mhz > >Thanks Don KA9QJG Go to www.repeater-builder.com and scroll down to "Construction Projects". The first item on that page is just what you are looking for. Mike WA6ILQ Yahoo! Groups Links
Re: [Repeater-Builder] Tower to antenna spacing
Tim: Try and get an old DB, Antenna Specialist, or Phelps Dodge base station antenna catalog. They have some curves that are fair approximations of side mount antennas on small surface towers(EG. Rohn 25G,45G, 55G). Most mfg. had recommended 1/4 wavelength between the antenna and the tower. On large surface towers you should be a couple of wavelengths off of the tower and even then you will have some deep nulls in the coverage. Fred W5VAY - Original Message - From: Tim and Janet To: Repeater-Builder@yahoogroups.com Sent: Friday, March 02, 2007 8:26 PM Subject: [Repeater-Builder] Tower to antenna spacing What is the standard spacing for a VHF antenna side mounted on rohn 25 tower? I found a page on repeater builder that showed 1/4-1/2 wavelength with a null behind the tower. I don't want to mount it any further than 4' from the tower but of course I would like to minimize the influence the tower has on the pattern. Anybody have a suggestion or a good source (link) of information? Thanks. Tim KB2MFS
Re: [Repeater-Builder] ge voter receive modules
Jon: The 19D429656G1 circuit board is a line level compensating board. This board is mounted on the sheet metal wrap around on the voter assembly and interconnects to the voter module by jumper wires. LBI30768A describes the voting module with the compensating board. Line level input to the voter can vary between -25 dbm to 0 dbm, while the output level remains at -30 dbm ± 0.75 dbm. You should obtain this LBI before trying to set up these voter modules. Fred W5VAY - Original Message - From: jon60070 To: Repeater-Builder@yahoogroups.com Sent: Friday, February 16, 2007 7:32 PM Subject: [Repeater-Builder] ge voter receive modules Ijust was looking at the receive modiules in the voter i recentely got and noted that there is no input level adjustment. upon inspection, i noted there are 2 boards in the module, the normal one as the schematic shows and the 2 nd one which is not documented (p/n 19d429656g1 ) is this an input agc bd? any ideas?
Re: [Repeater-Builder] Additional Loss From Trees
Actually Ken the loss at 800 MHz is usually less than UHF, especially in the long needle pine forests. Typical loss from forests, depending upon the density will be 10 to 20 db. Long needle pine forests will cause an additional 10 db loss at UHF frequencies and gets worse at 512 MHz. Fred W5VAY - Original Message - From: Ken Arck To: Repeater-Builder@yahoogroups.com Sent: Tuesday, February 06, 2007 7:05 PM Subject: Re: [Repeater-Builder] Additional Loss From Trees At 04:55 PM 2/6/2007, you wrote: >It is a noticeable loss when the leaves come out. I've pretty much noticed >that a fairly noisy signal with no leaves becomes unreadable when the leaves >are full. My opinion would be additional antenna height could be helpful >since there would be less density to attenuate the signal. <---Just ask the PS agencies in rural areas who have been foolish enough to migrate to 800 mHz trunking about foliage absorption... I'd bet they'd have a few things to say about that :-) Ken -- President and CTO - Arcom Communications Makers of the world famous RC210 Repeater Controller 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
Re: [Repeater-Builder] Simplex Repeater
Hire a good engineer or a consultant that specializes in radio microwave systems! Fred - Original Message - From: Kent Chong To: Repeater-Builder@yahoogroups.com Sent: Thursday, December 07, 2006 3:30 AM Subject: [Repeater-Builder] Simplex Repeater Good Day, We are using simplex radio (using single frequency for transmit and receive) and we would like to build a repeater. We would appreciate it if anybody could advise us how to do it. Best Regards, Chong Kwan Meng -- Meet your soulmate! Yahoo! Asia presents Meetic - where millions of singles gather
Re: [Repeater-Builder] spur from UHF MASTR II mobile - link radio
Users of MII mobiles as repeaters and/or base stations: You should expect interference when you cut corners to save a buck and use a mobile for a repeater. The mobile has no shielding to prevent RF entry or exit, none of the leads are in/out of the Rx and Tx are bypassed as in the MII stations! Mobile sets were never designed for this purpose. If you put a mobile on the air as a station and do not receive or give interference to others, consider yourself lucky. Fred W5VAY - Original Message - From: DK To: Repeater-Builder@yahoogroups.com Sent: Monday, November 27, 2006 2:40 PM Subject: RE: [Repeater-Builder] spur from UHF MASTR II mobile - link radio Jeff is correct It's the rx xstal freg x9 16.1602037 x 9 = 145.46 ish 73 Don W5DK -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Jeff DePolo Sent: Monday, November 27, 2006 2:27 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] spur from UHF MASTR II mobile - link radio > Hi guys, > > Built a link radio out of a MASTR II mobile a while back. > 444.575 TX, > 447.575 RX. It's the LO multiplier chain that you're hearing. 145.460 * 3 + 11.2 = 447.580 (447.575). > After having the link installed in my basement for a few days, I > realized that it's throwing a fairly strong dead carrier on VHF at > 145.460 or thereabouts, but ONLY when it's sitting idle in Receive. > When the radio is transmitting the carrier generated by the receiver > disappears. You don't hear it when the radio is TXing because the T/R relay disconnects the receiver from the antenna. --- Jeff -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.409 / Virus Database: 268.14.17/553 - Release Date: 11/27/2006 Yahoo! Groups Links
[Repeater-Builder] GE Repeater Control Board
Does anybody have the following GE Repeater Control Board that they would be willing to give up. 19D417385G1 or -G2 Please contact me direct. seamansfh @ sbcglobal . net Many Thanks Fred Seamans W5VAY YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] White Noise on Two Meters.....
Gary: First; get some test equipment out to the Rx site. Is the noise there when you receive a signal with out the link bringing the Tx up or only when you let the link key up the Tx? The horizonal isolation at 2M between dipoles is approximately 70 db. You didn't say what type antenna you had for a Rec ant. The 6db gain on the Tx antenna will decrease the isolation to approximately 64 db. not enough for a repeater system. If the noise is there only when the 2 m Tx is keyed up, the put a single notch cavity on the Tx to notch out the Tx noise, it may be necessary to also place a single notch cavity at the Rx site to improve the Tx freq isolation. You did not say anything about the Rx site. What else is there? If the noise is there without the 2M Tx being keyed up, now you have some other external source of the noise. You may have a simple intermod or a high order mix causing the noise. Get a good Spectrum Analyzer and start hunting. Fred W5VAY - Original Message - From: "Gary" <[EMAIL PROTECTED]> To: Sent: Thursday, May 25, 2006 3:48 PM Subject: [Repeater-Builder] White Noise on Two Meters. >I have an interesting thing happening on our two meter repeater. We > have what appears to be a blanking white noise that is present on the > input. The repeater is a split site system with a 440 link from the > two meter receiver site over to the transmitter site about 2000ft > away. There are no duplexers in the system to cause problems. > > The link on 440 is clean of any noise, so we are quite confident the > link is not a problem. > > On two meters, when a signal is anything less than full quiteing, we > get a white noise that will almost mask the audio. We have tried > different receivers such as the GE MVS and now a GE Master II. We > have removed the preamplifier with minimal results. The receivers > have excellent sensitivity and the tuning process of the receivers is > correct. We have also tried putting pass cavities ahead of the > receiver with no appreciable change. The antenna is a DB-224 mounted > on a broadcast tower just below the bays of an FM broadcast > commercial transmitter. We have turned OFF the fm broadcast > transmitter at times to check if perhaps this was the problem but no > change was noted. > > ANY IDEAS from anyone??? > > THANKS! > Gary - W5GNB > > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Is my math right
John: You are approximately correct. The Mfg. will have a spec load and a spec low voltage where the load cuts off. A greater load than this spec and you should obtain less A/H and less than this spec load, you will receive a greater A/H rating. The hard part is to find the Mfg specs. Fred W5VAY - Original Message - From: "Johnny" <[EMAIL PROTECTED]> To: Sent: Monday, May 22, 2006 10:02 AM Subject: [Repeater-Builder] Is my math right >A 350 Ah battery with a constent 4 amp draw will last about 87 hours ?? > > Johnny > > > > > > > Yahoo! Groups Links > > > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Good Radio's for Repeater?
The metal shielding in the base and repeater MII stations provide additional isolation from each other and misc external sources of RF. As we have seen many use the mobile for repeater systems and in most cases it does work satisfactorily. But you will find some installations where there will be interference to the repeater systems which would not be there if you had a few more db isolation. The MII isolation curves are with a standard metal chassis and cabinet and not the mobile. You roll the dice and take your chances when you use any mobile/mobiles for repeater installations at shared sites. Fred W5VAY - Original Message - From: "Robin Midgett" <[EMAIL PROTECTED]> To: Sent: Tuesday, May 09, 2006 2:57 PM Subject: Re: [Repeater-Builder] Good Radio's for Repeater? > I've been following this thread with interest, and have a couple of > points which (of course) lead to more questions. > The MASTRII RF strips are the same in the repeater chassis and the > mobile rigs, band for band from low band to UHF. Flexibility and > convenience options (and continuous duty PA issues) aside, why is a > MII repeater station better used as a repeater than a MII mobile rig? > I don't know if a Micor mobile and Micor repeater use the same RF > strips or not..do they? If so, then the same question applies, with > the same qualifiers. Same answer? > Granted, a reliable repeater is not made from a pair of "whatever you > can scrounge" mobile rigs with a controller in the middle. (Maxar > comes to mind as something in that category). Also in that line up > are amateur radios with 20% duty cycle, or practically anything that > says Alinco on it. > Where reliability concerns are fewer and convenience issues are > greater, then latitude is greater and mobile radios with a controller > in the middle (port-a-peaters) become attractive. > Thoughts? > > > At 11:55 AM 5/9/2006, you wrote: >>TGundo 2003 wrote: >> > Correct me if i'm wrong, but isn't an R-100 basically two mobiles in >> > a box with a power supply? >> >>Not really. While it shares a lot with the Maxtrac, it is a unique, from >>the ground up repeater. It definitely has a lot less in common with a >>Maxtrac then a Flexar repeater has in common with a regular Flexar. >>-- >>Jim Barbour >>WD8CHL >> >> >> >> >> >> >>Yahoo! Groups Links >> >> >> >> > > Thanks, > Robin Midgett K4IDC > 615-322-5836 office - rolls to pager > 615-835-7699 pager > 615-301-1642 home > [EMAIL PROTECTED] > http://www.people.vanderbilt.edu/~robin.midgett/index.htm > > > > > > > Yahoo! Groups Links > > > > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] M-Pro
Thank You for checking. 73's Fred - Original Message - From: <[EMAIL PROTECTED]> To: Sent: Tuesday, April 11, 2006 3:49 PM Subject: RE: [Repeater-Builder] M-Pro > > I looked - thought I had one but don't ... all are sufffux 66, > 77 & 88 > > Neil - WA6KLA > > > Original Message > From: [EMAIL PROTECTED] > To: Repeater-Builder@yahoogroups.com > Subject: RE: [Repeater-Builder] M-Pro > Date: Tue, 11 Apr 2006 10:27:21 -0500 > >>To All: Wanted, High split, low band, Mastr-Professional, Rx strip >>and 100 Watt Tx strip. If any one has these in their scrap heap and >>will sell cheep, contact me @ seamansfh @ sbcglobal . net. >>Thanks >>Fred Seamans W5VAY > > > > > > > > Yahoo! Groups Links > > > > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] M-Pro
Neil: MT74---33- for a mobile. Fred - Original Message - From: <[EMAIL PROTECTED]> To: Sent: Tuesday, April 11, 2006 12:17 PM Subject: RE: [Repeater-Builder] M-Pro > > Hi, > > I should have some of that / those in my garage. It's just > I need to think about what complete radio model number I am > looking for when I get out there in a few minutes. > > Neil > > Original Message > From: [EMAIL PROTECTED] > To: Repeater-Builder@yahoogroups.com > Subject: RE: [Repeater-Builder] M-Pro > Date: Tue, 11 Apr 2006 10:27:21 -0500 > >>To All: Wanted, High split, low band, Mastr-Professional, Rx strip >>and 100 Watt Tx strip. If any one has these in their scrap heap and >>will sell cheep, contact me @ seamansfh @ sbcglobal . net. >>Thanks >>Fred Seamans W5VAY > > > > > > > > Yahoo! Groups Links > > > > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[Repeater-Builder] M-Pro
To All: Wanted, High split, low band, Mastr-Professional, Rx strip and 100 Watt Tx strip. If any one has these in their scrap heap and will sell cheep, contact me @ seamansfh @ sbcglobal . net. Thanks Fred Seamans W5VAY YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] Connecting a repeater to a PBX
By using an interconnect with a security code that must be entered by the caller before they get connected: such as the Motorola MRTI. They are on the market cheep. I just picked up a spare MRTI-1000 on ebay for a dollar plus shipping. A little difficult to program but not unmanageable. Fred W5VAY - Original Message - From: <[EMAIL PROTECTED]> To: Sent: Friday, April 07, 2006 4:34 PM Subject: RE: [Repeater-Builder] Connecting a repeater to a PBX > > I wonder how will you keep wrong extension dialers from using > an FCC License required radio system? > > Neil - WA6KLA > > > Original Message > From: [EMAIL PROTECTED] > To: Repeater-Builder@yahoogroups.com > Subject: RE: [Repeater-Builder] Connecting a repeater to a PBX > Date: Thu, 6 Apr 2006 19:18:22 -0400 > >>I am looking for a low end method (aka cheap ) of connecting >>our small >>campus repeater to our PBX so that users can dial an extension and >>communicate over the repeater. We don't need to initiate access to >>the PBX >>from the repeater side. Someone told me that the CSI 5200 units could >>fit >>this bill. Any ideas? >> >>Bob > > > > > > > > Yahoo! Groups Links > > > > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] GE CG Board
LJ: I tried to reply to you at the address shown but it bounced as not deliverable. Thanks for the reply, but I have those long mobile and base station boards also. I need the small Tx only board. Fred - Original Message - From: [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Friday, March 10, 2006 10:34 AM Subject: Re: [Repeater-Builder] GE CG Board I don't have any of those small "exciter-only" CG boards, but I do have some of the DIP switch encode/decode programmable CG boards available that go into the MASTR II mobile and base station radios. LJ -Original Message- From: FHS <[EMAIL PROTECTED]>Sent: Mar 10, 2006 8:22 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] GE CG Board Do any of you have a Tx CG Board, 19C331044G1, in your surplus parts stock? This is a Tx only Programmable CG board. It is about 3" X 3" and mounts in the Tx exciter area of a MII repeater station. If you do, please let me know off net. Fred Seamans W5VAY YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
[Repeater-Builder] GE CG Board
Do any of you have a Tx CG Board, 19C331044G1, in your surplus parts stock? This is a Tx only Programmable CG board. It is about 3" X 3" and mounts in the Tx exciter area of a MII repeater station. If you do, please let me know off net. Fred Seamans W5VAY YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] hdtv radio shack ant ????
The Channel 2 Color Ant is for all of 6 Meter. The B&W is for the FM portion only. Merry Christmas To All! Fred W5VAY - Original Message - From: "Daron J. Wilson" <[EMAIL PROTECTED]> To: Sent: Tuesday, December 20, 2005 7:57 PM Subject: RE: [Repeater-Builder] hdtv radio shack ant > More importantly to this group, how do I interface it to my repeater ?? > > > >> -Original Message- >> From: Repeater-Builder@yahoogroups.com [mailto:Repeater- >> [EMAIL PROTECTED] On Behalf Of mch >> Sent: Tuesday, December 20, 2005 4:48 PM >> To: Repeater-Builder@yahoogroups.com >> Subject: Re: [Repeater-Builder] hdtv radio shack ant >> >> You know, this subject (mail subject line) reminds me of the stories I >> was told about them coming out with antennas for *COLOR* TV that were >> interpreted to be different from B&W TV antennas. Supposedly, for color >> TV you needed a Color TV antenna. >> >> B&W TV, Color TV, HDTV... they ALL use the same frequencies and the same >> antennas would work equally well. >> >> Joe M. > > > > > > > > > Yahoo! Groups Links > > > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[Repeater-Builder] Low band station listed on EBAY
Will the person that sent a msg to yahoo groups about listing a low band station on EBAY please send me the EBAY Item Number. I have searched EBAY under GE, Mastr, MastrII without finding it. [EMAIL PROTECTED] Thanks Fred W5VAY YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] Combining questions
Gentlemen: I guess I will add my 2 cents worth here. In a two Tx Ferrite Hybrid combiner each Tx will have at least one ferrite isolator and some times three between the TX and the combiner. For a two Tx combiner there will be approximately 3.5 db loss for each Tx. When increasing to a four Tx combiner you will combine two groups of twoTx's, split the power again and add some additional losses for approximately 7.0 db loss for each Tx. And so, with an 8 Tx combiner you combine two groups of 4 together for an additional 3.5 db loss for each Tx or a total of approximately 10.5 db loss to each Tx in the 8 Tx combiner. In addition a low pass filter will be in the combiner output adding another few tenths of a db loss to each Tx. Also, if the frequency separation between the Tx's is great, there will be some additional losses. I have typically measured 8-9 watts per Tx on a close spaced system at the output of an 8 Tx combiner on UHF. If you get 11 watts at the antenna per Tx consider it a great system. Fred W5VAY - Original Message - From: "Tom Saunders" <[EMAIL PROTECTED]> To: Sent: Friday, August 05, 2005 9:38 AM Subject: Re: [Repeater-Builder] Combining questions >> about 55% of each transmitter's >> output gets burned up in a dummy load, each time two signals are >> combined. Thus, eight 100 watt repeaters combined into one antenna > will >> have about 11 watts at the antenna. > > While it is true that aprox. 50% of the power from each transmitter is > lost in the combiner, the remaining 50% gets thru. So a 100 watt > transmitter will send 50 watts out to the transmission line. 50 * 8 = > 400w total. > > Tom Saunders > Comm Tech, City of Seattle > Amateur Radio Station N7OEP > 206.384.1604 > [EMAIL PROTECTED] > > > > > > Yahoo! Groups Links > > > > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Department of Forestry Tower, Any Experiance???
Alex: I would urge you to look elsewhere for an antenna location. I worked for a state forestry agency for ten years and we did not let anybody except other governmental agencies on our lookout towers or radio towers. There were just to many liability and cooperation problems when a problem comes up. I even refused access to the FBI until they gave us the technical details of three repeaters that they wanted to place on our tower. If you are able to get approval, there are quite a few coverage problems associated with the lookout towers because of their large size. When you side mount an antenna the antenna should be perfectly vertical, which means you will have to design special mounting brackets. Any side mounted antenna will have very deep nulls. I have experienced nulls as deep as 50 db off of the antenna. On one site I could see the tower and antenna from 6 miles away, but could not key up the repeater with a 100 watt high band mobile. If you top mount your antenna the forestry dept. will want to know how you will do it. There is no easy way. The next problem will be routing the coax down past the observation windows. If the tower is still used for fire detection during fire season, they will not want any obstruction in the way for their tower man to view 360 degrees, hence your coax for a top mounted antenna better be invisible as it passes by the observation room at the top of the tower. Your next problem will be the type of enclosure you will be using for the equipment and how you will get power to your equipment. I would be sure the forestry dept. will not want to supply you with power at governmental expense. Fred W5VAY - Original Message - From: "Alexander N Tubonjic" <[EMAIL PROTECTED]> To: Sent: Thursday, July 28, 2005 12:36 AM Subject: [Repeater-Builder] Department of Forestry Tower, Any Experiance??? > Hello All, > The local department of Forestry has an observation tower that is > over 200' off the ground. I would like to put my UHF Amateur repeater > on that tower. I stopped by yesterday and talked to the Fire Fighter > that was stationed there. He had told me that cellphone companies had > asked if they could put some equipment on the tower and the DOF flat > out said no; however, the guy I talked to said a friend of his was a > Ham and had expressed an interest in putting a Ham repeater on the > tower and it was okayed but the Ham moved before anything was put into > effect. The guy I talked with said to leave my contact information and > he would pass it on to his boss and have him contact me with more > information. > I was wondering if anyone has done anything tower related with the > Department of Forestry? If so what was your experiance like? I > remember reading somewhere that hams and the DOF have an MOU together > for tower space, anyone know anything about that? Any past experiances > and tips would be greatly appreciated. Thanks and 73. > Alexander KG4OGN > > > > > > > > Yahoo! Groups Links > > > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
