RE: [Repeater-Builder] question about combiners
When the 2 channels are around 2 to 2.5 mhz apart it is pretty easy to use 2 duplexers, BpBr tuned to pass normally, but the reject is set normal on one cavity, and to reject the second repeater tx, or rx on the second cavity. If the two channels are 200 khz or less apart then a single duplexer tuned mid band, and a hybrid combiner on the transmitters, and a splitter on the receivers works pretty good not withstanding hybrid loss. At 850 khz it is a little more difficult. This combination might take 2 BpBr duplexers plus a third cavity on the receive half of each duplexer. May take some cut and try with a tracking generator. Good luck, Steve Nu5d Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
RE: [Repeater-Builder] question about combiners
If you supply the frequencies and power levels it would be helpful in answering this question Thank you Joe N1EZO/8 I find television very educating. Every time somebody turns on the set, I go into the other room and read a book. -- Groucho Marx, 1890-1977 -Original Message- From: Jed Barton [mailto:[EMAIL PROTECTED] Sent: Sunday, December 07, 2003 2:06 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] question about combiners Hey guys. OK, this is a bit greek to me, so your info is appreciated. I have 1 sight, and 2 repeaters. We don't have the space to put them on separate antennas. We have a station master. Could i run 2 UHF repeaters on 1 antenna? I know i would need a combiner. What type of combiner would i need? Any info on doing this would be appreciated. Kindest Regards, Jed.n1jbc Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] Question about combiners
Give TX RX a call and they can give you a price. Ask for Bob in sales. I had it done at one time on a business set of repeaters but the cost kept it from being done. John - Original Message - From: "Eric Lemmon" <[EMAIL PROTECTED]> To: Sent: Sunday, December 07, 2003 3:25 PM Subject: Re: [Repeater-Builder] Question about combiners > Jed, > > There are several options, all of them expensive. Whether you go the > hybrid-ferrite route or the cavity-ferrite route depends not only upon > the frequencies of your two repeaters, but also those of other > transmitters at the site. Either way, you must separate the two > receivers from the two transmitters. > > A combiner is used to feed both transmitters to one antenna so that each > transmitter sees a good 50 ohm match to the antenna, but is isolated > from the other transmitter. When a hybrid is used, you lose slightly > more than half of the power from each transmitter. That is, when you > combine two 100 watt transmitters using a hybrid, each transmitter now > has about 40-45 watts going to the antenna. The cavity route is better, > but is more costly. > > A multicoupler is used to split the receive frequencies from a separate > antenna to the two receivers. There will be a preselector or bandpass > cavities ahead of an amplifier, and a splitter to divide the signal > among the receivers. > > Since you must have two antennas and the equivalent of two duplexers to > make either system work, it is very likely cheaper to simply use two > antennas- one for each repeater. Even if you have two commercial-grade > repeaters, you almost certainly will need ferrite isolators and low-pass > filters on both machines. Choose wisely... > > 73, Eric Lemmon WB6FLY > > > Jed Barton wrote: > > > > Hey guys. > > OK, this is a bit greek to me, so your info is appreciated. I have 1 site and 2 repeaters. We don't have the space to put them on separate antennas... Could I run 2 UHF repeaters on 1 antenna?... > > > > > > > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ > > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] question about combiners
it would be not as costly if you had a bigger spacing on the freg. - Original Message - From: Jed Barton To: Repeater-Builder@yahoogroups.com Sent: Sunday, December 07, 2003 3:24 PM Subject: Re: [Repeater-Builder] question about combiners Hey there. The frequencies are 447.025 and 447.825 for the outputs with standard down inputs - Original Message - From: Lee Williams To: Repeater-Builder@yahoogroups.com Sent: Sunday, December 07, 2003 2:14 PM Subject: Re: [Repeater-Builder] question about combiners It all depends on your frequencies,rx and tx. - Original Message - From: Jed Barton To: Repeater-Builder@yahoogroups.com Sent: Sunday, December 07, 2003 2:05 PM Subject: [Repeater-Builder] question about combiners Hey guys. OK, this is a bit greek to me, so your info is appreciated. I have 1 sight, and 2 repeaters. We don't have the space to put them on separate antennas. We have a station master. Could i run 2 UHF repeaters on 1 antenna? I know i would need a combiner. What type of combiner would i need? Any info on doing this would be appreciated. Kindest Regards, Jed.n1jbcYour use of Yahoo! Groups is subject to the Yahoo! Terms of Service. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] Question about combiners
I don't know why I skipped this idea but slow waking up today, I just mounted one of these nick named a half-n-half about a week ago. If mounting only one antenna is your limitation this method has solved the problem more than once, db products can do the stacking and it ends up being about 16 feet high - it could be done with 2 uhf antennas but would need to be braced in the upper 2/3 as the true mast for this by db is a larger size than regular antennas. You would need 2 seperate feed lines but only one base bracket and the upper brace which can be made from schedule 80 electrical pvc tubing and some stainless u-bolts - mcmaster-carr is a place to find them with extra long threaded segments. Adding isolators to the transmitters would be a good idea to prevent causing swr trouble down on the pa decks, but the basic duplex cavities alone would then be used instead of all that expensive combining stuff. mch wrote: > > Eric Lemmon wrote: > > > > Since you must have two antennas and the equivalent of two duplexers to > > make either system work, it is very likely cheaper to simply use two > > antennas- one for each repeater. > > Not necessarily. You can combine the combiner and multicoupler on one > antenna, but it's even more expensive then two antennas. > > Here is another possibility: > Get a dual dipole array antenna. It's like a large array, but has two > feedlines - one for the lower half and one for the upper half. Use each > half into a standard duplexer going to each repeater. One 'antenna' (one > mount, one pole), but two feedlines and two standard-duplexed repeaters. > > Joe M. -- 73...Clark Beckman N8PZD Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Question about combiners
Eric Lemmon wrote: > > Since you must have two antennas and the equivalent of two duplexers to > make either system work, it is very likely cheaper to simply use two > antennas- one for each repeater. Not necessarily. You can combine the combiner and multicoupler on one antenna, but it's even more expensive then two antennas. Here is another possibility: Get a dual dipole array antenna. It's like a large array, but has two feedlines - one for the lower half and one for the upper half. Use each half into a standard duplexer going to each repeater. One 'antenna' (one mount, one pole), but two feedlines and two standard-duplexed repeaters. Joe M. Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Question about combiners
Jed, There are several options, all of them expensive. Whether you go the hybrid-ferrite route or the cavity-ferrite route depends not only upon the frequencies of your two repeaters, but also those of other transmitters at the site. Either way, you must separate the two receivers from the two transmitters. A combiner is used to feed both transmitters to one antenna so that each transmitter sees a good 50 ohm match to the antenna, but is isolated from the other transmitter. When a hybrid is used, you lose slightly more than half of the power from each transmitter. That is, when you combine two 100 watt transmitters using a hybrid, each transmitter now has about 40-45 watts going to the antenna. The cavity route is better, but is more costly. A multicoupler is used to split the receive frequencies from a separate antenna to the two receivers. There will be a preselector or bandpass cavities ahead of an amplifier, and a splitter to divide the signal among the receivers. Since you must have two antennas and the equivalent of two duplexers to make either system work, it is very likely cheaper to simply use two antennas- one for each repeater. Even if you have two commercial-grade repeaters, you almost certainly will need ferrite isolators and low-pass filters on both machines. Choose wisely... 73, Eric Lemmon WB6FLY > Jed Barton wrote: > > Hey guys. > OK, this is a bit greek to me, so your info is appreciated. I have 1 site and > 2 repeaters. We don't have the space to put them on separate antennas... > Could I run 2 UHF repeaters on 1 antenna?... Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] question about combiners
Hey there. The frequencies are 447.025 and 447.825 for the outputs with standard down inputs - Original Message - From: Lee Williams To: Repeater-Builder@yahoogroups.com Sent: Sunday, December 07, 2003 2:14 PM Subject: Re: [Repeater-Builder] question about combiners It all depends on your frequencies,rx and tx. - Original Message - From: Jed Barton To: Repeater-Builder@yahoogroups.com Sent: Sunday, December 07, 2003 2:05 PM Subject: [Repeater-Builder] question about combiners Hey guys. OK, this is a bit greek to me, so your info is appreciated. I have 1 sight, and 2 repeaters. We don't have the space to put them on separate antennas. We have a station master. Could i run 2 UHF repeaters on 1 antenna? I know i would need a combiner. What type of combiner would i need? Any info on doing this would be appreciated. Kindest Regards, Jed.n1jbcYour use of Yahoo! Groups is subject to the Yahoo! Terms of Service. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] question about combiners
You would need a combiner/multicoupler combination. I think it's been done, but it's very expensive. Typical combiner/multicoupler use is to have one each on its own antenna - one on the combiner for the TXs, and another on the multicoupler for the RXs. This is expensive on its own. What you need is another step above that. As I said, I think it's been done, but you need to combine the combiner and multicoupler into the single antenna. Hopefully they are both on the same segment, and not one on 460 and the other on 450, as you will need bandpass filters to isolate the TX range segment (I.E. 460-465 MHz) from the RX range segment (I.E. 465-470 MHz). Joe M. > Jed Barton wrote: > > Hey guys. > OK, this is a bit greek to me, so your info is appreciated. > I have 1 sight, and 2 repeaters. > We don't have the space to put them on separate antennas. > We have a station master. > Could i run 2 UHF repeaters on 1 antenna? > I know i would need a combiner. What type of combiner would i need? > Any info on doing this would be appreciated. > > Kindest Regards, > Jed.n1jbc > > Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
RE: [Repeater-Builder] question about combiners
What is power and frequency? Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] question about combiners
Typically no, the transmit part is the combiner and it will be expensive unless you get very lucky in used stuff. All the filtering/duplex parts will be very frequency specific and tough to locate already in the ham band, you may find the losses far outweigh choosing another site. Have you used either machine at this site and had any innermod problems or desense from adjascent equipment? If so you will be bux ahead to move to another site unless you can convince everyone there to add more filtering until it clears itself up. > Jed Barton wrote: > > Hey guys. > OK, this is a bit greek to me, so your info is appreciated. > I have 1 sight, and 2 repeaters. > We don't have the space to put them on separate antennas. > We have a station master. > Could i run 2 UHF repeaters on 1 antenna? > I know i would need a combiner. What type of combiner would i need? > Any info on doing this would be appreciated. > > Kindest Regards, > Jed.n1jbc -- 73...Clark Beckman N8PZD Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] question about combiners
It all depends on your frequencies,rx and tx. - Original Message - From: Jed Barton To: Repeater-Builder@yahoogroups.com Sent: Sunday, December 07, 2003 2:05 PM Subject: [Repeater-Builder] question about combiners Hey guys. OK, this is a bit greek to me, so your info is appreciated. I have 1 sight, and 2 repeaters. We don't have the space to put them on separate antennas. We have a station master. Could i run 2 UHF repeaters on 1 antenna? I know i would need a combiner. What type of combiner would i need? Any info on doing this would be appreciated. Kindest Regards, Jed.n1jbcYour use of Yahoo! Groups is subject to the Yahoo! Terms of Service. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
[Repeater-Builder] question about combiners
Hey guys. OK, this is a bit greek to me, so your info is appreciated. I have 1 sight, and 2 repeaters. We don't have the space to put them on separate antennas. We have a station master. Could i run 2 UHF repeaters on 1 antenna? I know i would need a combiner. What type of combiner would i need? Any info on doing this would be appreciated. Kindest Regards, Jed.n1jbc Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
