Re: [Repeater-Builder] Re: 6 meter low band Duplexers
Probably similar to the this: http://users.adelphia.net/%7Ek1ike/Mot%20VHF%20DUP2.JPG These are VHF duplexers that are the size of regular Motorola UHF duplexer cans. The major difference is the center plunger. I tuned this set up for a 5+MHz split commercial repeater and they worked very well. 73, Joe, K1ike At 08:00 PM 4/30/2006 -0400, you wrote: >The disk makes the can longer by capacitance. Common in wideband 225-400 >mhz military stuff and also military 25-50 mhz duplexer units. It lowers >the Q though. > >Chris 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] Re: 6 meter low band Duplexers
In a message dated 4/30/2006 5:32:57 PM Eastern Daylight Time, [EMAIL PROTECTED] writes: In Repeater-Builder@yahoogroups.com, [EMAIL PROTECTED] wrote:>> Is this in addition to lengthening the cans?Yes, I would expect that you would need a can stretcher. You get themfrom the same place as coax strechers.;c}Jim WD8CHL The disk makes the can longer by capacitance. Common in wideband 225-400 mhz military stuff and also military 25-50 mhz duplexer units. It lowers the Q though. Chris 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] GM340
Hi i have two Motorola GM340s is it possible to get a connecting lead to make them into a repeater, the same as you can with the GM300s, thanks Bob M0CSV 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] new repeater
Bruce, You've got a real challenge here... but more information would help to make intelligent choices, such as: 1. Do you already have a duplexer? If so, what make and model? 2. Are there any other emitters at the site? If so, what frequency and power? 3. Is the radio room heated and/or cooled? 4. What is the make and model of the existing 2m antenna? 5. What is the length and type of feedline between the radio room and the antenna? 6. What is the elevation of the antenna's radiation center? 7. What is the desired coverage area of this proposed repeater? 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of capvan1 Sent: Sunday, April 30, 2006 6:53 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] new repeater I'm going to build a completly new 2-meter repeater. It's in a very remote site for the winter months, so it must be robust. Emergency power is already available, so that's no concern. 2-meter antenna already in place. In Vermont. I want it to have: 1) Talking S-meter 2) PL tone 3) Automatic weather station No phone patch needed (or wanted) Ok, guys. Here's your dream. What would you set-up with a budget of $3,000? I'd love to purchase a turn-key setup if one was available. Reply off group if you want... 73 Bruce [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/
[Repeater-Builder] Re: 6 meter low band Duplexers
--- In Repeater-Builder@yahoogroups.com, [EMAIL PROTECTED] wrote: > > Is this in addition to lengthening the cans? Yes, I would expect that you would need a can stretcher. You get them from the same place as coax strechers. ;c} Jim WD8CHL 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] Converting a Johnson 559 into a repeater
If you have a manual it's very easy. If not try and find one. Once you have the manual I can help but it will be much easier with the service manual on hand. Paul -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of cmpd1964 Sent: Friday, April 28, 2006 5:39 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Converting a Johnson 559 into a repeater I was given a mint condition EF Johnson 559 UHF mobile which I wish to convert into a repeater. I have prior repeater building experience, mostly with GE MVPs and Exec lls. Any and all info would be greatly appreciated 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] new repeater
At 06:53 AM 04/30/06, you wrote: I'm going to build a completly new 2-meter repeater. It's in a very remote site for the winter months, so it must be robust. Emergency power is already available, so that's no concern. 2-meter antenna already in place. In Vermont. I want it to have: 1) Talking S-meter 2) PL tone 3) Automatic weather station No phone patch needed (or wanted) Ok, guys. Here's your dream. What would you set-up with a budget of $3,000? Hello Kevin... A GE M2 station from the sponsor of the repeater-builder web site < http://www.repeater-builder.com/products> At a remote site like that, you will want to know about any antenna problems. I'd make sure that the controller I used supported multiple analog inputs, and tie two of them to the forward and reverse power measurement voltages. Look at the photo in this web page < http://www.bird-electronic.com/products/mproduct.aspx?CID=5&MID=217&SID=80&ID=102 > You occasionally see the middle one or the bottom one in surplus, and both have two power measurement sensors, and you can tap across the DC voltage. The Bird meter is a 30ua meter, so the voltage is small, and you will have to use a high-impedance measuring method. One of the middle photo units went on ebay a while back for under $100. It needed a paint job on the rack panel, and the slugs were missing (there were two of the aluminum plugs in place). Telewave makes a similar unit as well as just the power sensors. Even if you don't add the power monitoring in the beginning, I'd keep it in the back of my mind as a future addition. As far as the controller, look at: NHRC < http://www.nhrc.net/comparison.php>, Arcom < http://www.ah6le.net/arcom/rc210/rc210.html>, Link Comm < http://www.linkcomm.com/controllers/about.htm> CAT Automation < http://www.catauto.com/products.html> They have a couple of models designed to talk to the Peet Bros weather stations. Davis brand weather stations have a serial port option, and I've seen one interfaced to a dialup modem at a repeater site. The site owner would dial up from home to look at the data. I heard later on that someone paralleled off the data cable into their repeater controller, but I don't know what brand controller. Look at < http://www.ambientweather.com/mappolicy.html> or < http://www.weathershop.com> A web search on "weather station" and "APRS" will turn up a gazillion hits. Likewise "weather station" and "skywarn". Some of the hits may actually have something useful as far as interfacing a weather station to a repeater controller. I'd love to purchase a turn-key setup if one was available. Talk to Kevin. He can supply you with a M2 station with any of the controllers mentioned above in it. Reply off group if you want... Naahhh you want the brain trust to beat the idea around. This way you get reactions to postings. 73 Bruce [EMAIL PROTECTED] Mike WA6ILQ 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] Re: Transmitter combining and Multicoupling information.
What band are you dealing with and its frequency spread? The length of cable including the loop's effective length and the star's contribution should equal an electrical odd multiple of a quarter wavelength. Easiest way to verify the actual length required is to remove the loop from the can (or adjust it for minimal coupling) and put it in the star with a cable of approximately the correct length and use 2 of the other star ports to measure the resonant frequency of the loop and cable to see if it is in the mid of your frequency spread. All the cables would then be the same length to the star if the loops are the same. The open stub would be close to the electrical 1/2 wavelength if required to make the output return loss symmetrical and better. I personally usually do not use a stub and try to make the cables work alone but then again, I am using an Agilent 8753ES network analyser that makes the job very easy. The stub is used if the frequency span is larger or the cables used are not the ideal lengths. The open circuit stub is trimmed to make the return loss symmetrical. Harold --- In Repeater-Builder@yahoogroups.com, "skipp025" <[EMAIL PROTECTED]> wrote: > > Hi Gareth, > > > "Gareth Bennett" wrote: > > I am appealing to the wisdom of the group for information > > regarding Transmitter combining (Multicoupling). > > OK, we'll try to help. > > > I am interested in the maths and formula involved in cable > > lengths, coaxial stubs, etc for the "Star" style of TX > > combining. > > Yes there is math, but almost every combiner system is an as built > based to the overall system requirements and performance trade > offs. The cable lengths are based no relative odd 1/4 wave lenghts > with lots of things changing the actual length. > > > I have inherited a site that has been added to over the years > > with different equipment and filter styles. I need to re-build > > the TX (and RX) side to tidy it all up. > > The first think you'll need to do is make a spread sheet of your > tx and rx frequencies. > > > Each TX leg is like this... TX, Isolator, Cavity filter, > > 3/4 wavelength coax to star combiner... Nothing flash, > > just want to know the maths behind it and to fine tune > > the system > > There are rules of thumb for the combiner engineering, based > on a number of variables... first the frequecy list, second > the allowed mix problems are checked, third the materials > you have to construct the combiner, fourth the loss or performance > trades vs frequency spacing, fifth the actual equipment you'd > like to use. > > > Especially the Transmitter coaxial stub information that > > usually is found on one spare combiner port. > > Measure the existing stub for open or shorted end. It's most > often a harmonic trap/stub, 1/2 the length of the in band > quarter wave length. > > > Thanks for reading :-) > > No problama, it's hard to be specific without more information > from you. If you ask Telewave - Sinclair or the Andrew Decibel > RF Engineers about making a combiner, they'll want your frequency > list first. Sometimes you can make a single antenna do everything, > sometimes you split the antennas. In problematic frequency > combinations, you might need to have/include both additional tx > and rx antennas to avoid system gremlins. > > When a multi channel pre-configured tx combiner works right > out of the box, I would consider the owner and mfgr very > good and a bit lucky. Combiners are where I picked up the > "no free lunch" line. In close space combinations, you try > to keep the power loss to less than 60%. Also, your results > will probably vary... > > cheers, > skipp > 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] new repeater
I'm going to build a completly new 2-meter repeater. It's in a very remote site for the winter months, so it must be robust. Emergency power is already available, so that's no concern. 2-meter antenna already in place. In Vermont. I want it to have: 1) Talking S-meter 2) PL tone 3) Automatic weather station No phone patch needed (or wanted) Ok, guys. Here's your dream. What would you set-up with a budget of $3,000? I'd love to purchase a turn-key setup if one was available. Reply off group if you want... 73 Bruce [EMAIL PROTECTED] 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] Converting a Johnson 559 into a repeater
I was given a mint condition EF Johnson 559 UHF mobile which I wish to convert into a repeater. I have prior repeater building experience, mostly with GE MVPs and Exec lls. Any and all info would be greatly appreciated 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] FLAT AUDIO -- GM300 / MAXTRAC
[EMAIL PROTECTED] wrote: > Hi all! > > Maybe I'm going blind (after reading all the small print of the manual)! or > I just missed it somewhere... > > On the GM300 or Maxtrac: > > Is there a software spot or a control switch that send flat audio to the 16 > pin accessory connector rather than pre-emp audio? With the GM300 P551 in position "A" provides unmuted/flat audio and position "B" provides muted audio with de-emphasis. > Thanks Brian, WD9HSY > -- Cheers, Mick E-mail: [EMAIL PROTECTED] 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/
