Re: [Repeater-Builder] Tower Duplexer
Thanks to Jeff and all the other members that replyed to my question. I'll be putting a plan together. Kevin W5KGT 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 the Yahoo! Terms of Service. Do you Yahoo!?Win a $20,000 Career Makeover at Yahoo! HotJobs 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 the Yahoo! Terms of Service.
Re: [Repeater-Builder] Tower Duplexer
Steve S. Bosshard (NU5D) wrote: > I am thinking the duplexers will be on the ground, and you simply want to > run both a VHF and UHF repeater using the same feedline and different > antennas at the top. If so, a cross band coupler is the device, one at the > top and one at the bottom. They are very broad band devices and should > require no tuning. > > Steve > What you want is a diplexer, not a duplexer. As others said, the best bet is commercial grade, like TX/RX, Sinclair, etc. The made-for-ham stuff isn't as likely to hold up on a tall tower. -- Jim Barbour 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] Tower Duplexer
Uh, here I go with part of my shoe in my mouth. I didn't read the last 2 lines completely, what you need is a diplexor, you could try building this from 1/4 and 3/4 electrical wave length of 75 or 35 ohm coax - something very similar is used by Cushcraft for dual-band beams, I think using an isolator would be prudent to prevent a high band triplen harmonic from making it's way to the uhf rx. Virden Clark Beckman wrote: > > Why mount antennas if you can't put cable on them, wait till the time is > correct. As far as duplexing goes, you will need them tuned to operate > on your freqs. and offer enough isolation to prevent the tx from > blocking the rx, this usually is 100-120db depending on the noise levels > present in your transmitter system. > > w5kgt wrote: > > > > Hey Guy's, > > I have the opportunity to install a DB-224 and a DB-420 on a 500' > > tower. But the funds are lacking for two runs of hardline. With 60 > > watts on the 2 meter repeater and 40 watts on the 70cm repeater. What > > kind of Duplexers can I use on this system for one run of hardline? > > I'm talking dependable. > > > > W5KGT > > www.w5kgt.com > > > > > > Yahoo! Groups Links > > > > > > > > > > -- > 73...Clark Beckman N8PZD -- 73...Clark Beckman N8PZD 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] Tower Duplexer
I am thinking the duplexers will be on the ground, and you simply want to run both a VHF and UHF repeater using the same feedline and different antennas at the top. If so, a cross band coupler is the device, one at the top and one at the bottom. They are very broad band devices and should require no tuning. Steve 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] Tower Duplexer
Why mount antennas if you can't put cable on them, wait till the time is correct. As far as duplexing goes, you will need them tuned to operate on your freqs. and offer enough isolation to prevent the tx from blocking the rx, this usually is 100-120db depending on the noise levels present in your transmitter system. w5kgt wrote: > > Hey Guy's, > I have the opportunity to install a DB-224 and a DB-420 on a 500' > tower. But the funds are lacking for two runs of hardline. With 60 > watts on the 2 meter repeater and 40 watts on the 70cm repeater. What > kind of Duplexers can I use on this system for one run of hardline? > I'm talking dependable. > > W5KGT > www.w5kgt.com > > > Yahoo! Groups Links > > > > -- 73...Clark Beckman N8PZD Pursuant to U.S. Code, title 47, Chapter 5, Subchapter II, ß227, "Any and all nonsolicited commercial E-mail sent to this address is subject to a download and archival fee of $500.00 U.S.". E-mailing denotes acceptance of these terms. 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] Tower Duplexer
I would look toward TXRX, or EMR Corp, or Telewave or a Cross Band Coupler. I have used Telewave brand for years on my 450/800 single feed line systems. They tout 0.37 db insertion loss for a pair. I also have a set of Wacom's Cross Band at a different site. They are much more expensive than the $32 things made to go on the back of a rig. They also don't get nearly as hot under power. My 2 cents, Steve But I may be wrong. 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] Tower Duplexer
At 12:38 AM 4/30/2004 -, you wrote: > I have the opportunity to install a DB-224 and a DB-420 on a 500' >tower. But the funds are lacking for two runs of hardline. With 60 >watts on the 2 meter repeater and 40 watts on the 70cm repeater. What >kind of Duplexers can I use on this system for one run of hardline? >I'm talking dependable. <---One of my UHF repeater antennas is up a 167' tower, with hardline running up there. I also have a 2 meter antenna for my remote base up the tower too. The same hardline is used for both bands and it works just fine. Although it is kinda strange watching the wattmeter go from 70 watts with just the repeater talking, to over 100 when the remote transmits :-) Just get one that can handle the combined power, since both repeaters will transmit at the same time. I think I used a pair of Comets for my installation, rated at 250. I figured that was conservative enough and so far, no problems. Truth be told, I doubt there is much difference between the different brands anyway. A couple of low-Q bandpass filters ain't exactly rocket science :-) Ken -- President and CTO - Arcom Communications Makers of state-of-the-art repeater controllers and accessories. http://www.ah6le.net/arcom/index.html Be sure to see our products at this year's Dayton Hamvention! Repeater Builders spaces 707 through 710 AH6LE/R - IRLP Node 3000 http://www.irlp.net 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/
