Re: [Repeater-Builder] Icom IC-3at as a remote
I used a 4AT for a link transceiver for awhile and I don't remember it being too difficult to interface to my controller. I'll look for any notes that I still may have, but that may take some time. The ham shack is torn apart right now remodeling windows. I remember using a relay to key the HT PT to keep it simple. Look at some of the notes available on interfacing the HT packet radio use. This should answer your question on how to get rid of the 5 volts. I think the MFJ 1270 TNC may have the information in it. 73, Joe, K1ike -- Original message -- From: georgiaskywarn [EMAIL PROTECTED] Has anyone ever done this before on a RC210 before? Any special resistor / cap. combos needed? There is 5v on the tx line. Unfortunately my test bed here at home is a MCC GE Mastr Exec II with the RC100 built in. Don't think it would be the same as the site repeater with the RC210. Any suggestions would be appreciated, 73 Robert KD4YDC ---BeginMessage--- Has anyone ever done this before on a RC210 before? Any special resistor / cap. combos needed? There is 5v on the tx line. Unfortunately my test bed here at home is a MCC GE Mastr Exec II with the RC100 built in. Don't think it would be the same as the site repeater with the RC210. Any suggestions would be appreciated, 73 Robert KD4YDC ---End Message---
[Repeater-Builder] Re: Icom IC-3at as a remote
Hey Joe, Thanks for the info. Not really having a problem keying it, just the tx audio sounds real bad (bassy and mushy) and not enough drive. Will take a look on some packet sites though. Txns, Robert --- In Repeater-Builder@yahoogroups.com, [EMAIL PROTECTED] wrote: I used a 4AT for a link transceiver for awhile and I don't remember it being too difficult to interface to my controller. I'll look for any notes that I still may have, but that may take some time. The ham shack is torn apart right now remodeling windows. I remember using a relay to key the HT PT to keep it simple. Look at some of the notes available on interfacing the HT packet radio use. This should answer your question on how to get rid of the 5 volts. I think the MFJ 1270 TNC may have the information in it. 73, Joe, K1ike -- Original message -- From: georgiaskywarn [EMAIL PROTECTED] Has anyone ever done this before on a RC210 before? Any special resistor / cap. combos needed? There is 5v on the tx line. Unfortunately my test bed here at home is a MCC GE Mastr Exec II with the RC100 built in. Don't think it would be the same as the site repeater with the RC210. Any suggestions would be appreciated, 73 Robert KD4YDC
Re: [Repeater-Builder] Motorola Pagers for telemetry
I think the Advisor was either 512 or 1200 baud POCSG. The RF receiver section determined the frequency range and it plugged into the main board that was the decoder and display. If I remember correctly, you can just plug in the frequency band receiver that you wanted to use onto any main board and it will work. Somewhere, I think, I still have the programming stand and cable for the Advisor (if it is the bigger, older style Advisor). You needed this to program the pager, plus propriatory Motorloa software (don't know if I still have this). The big question is: do you have the password? There were companies that could hack the password or sell you a pager that has a known password. Without the password, there is no way that I know of resetting it. 73, Joe, k1ike -- Original message -- From: Nigel Johnson [EMAIL PROTECTED] A few years ago I undertook to replace our old 300 baud telemetry system at VE3RPT with something a little more modern, and bought a POCSAG encoder and ordered some xtals for our command frequency and an old Motorola pager. Somewhere along the way, I lost the pager! I recently found a Motorola Advisor pager p/n A04KLB5662AA and was wondering if anybody out there has tech data on this, specifically if it is POCSAG and what the xtal formula is? Apparently the menus can also be programmed, does this use some kind of a RIB? any help would be appreciated 73 Nigel Johnson ve3id ---BeginMessage--- A few years ago I undertook to replace our old 300 baud telemetry system at VE3RPT with something a little more modern, and bought a POCSAG encoder and ordered some xtals for our command frequency and an old Motorola pager. Somewhere along the way, I lost the pager! I recently found a Motorola Advisor pager p/n A04KLB5662AA and was wondering if anybody out there has tech data on this, specifically if it is POCSAG and what the xtal formula is? Apparently the menus can also be programmed, does this use some kind of a RIB? any help would be appreciated 73 Nigel Johnson ve3id ---End Message---
[Repeater-Builder] 1-5/8 Heliax for sale
1-5/8 Heliax for sale: The McMinn Co Amateur Radio Club offers for sale the following: 3 rolls of 1-5/8 Heliax cable with Huber Suhner EMP Protector / 7/16 Connector on the bottom end. There is approximately 190-200 feet on each roll of cable. The cable is used, but in good condition, still sealed with the connectors intact. The cable does have hoisting grips on the top end, and grounding whips. NOTE: This cable is not a stolen hack job. This cable was professionally removed from a tower by a cell carrier and donated to our club. The cable is $350 per roll, with the mentioned connectors. This is a huge bargain. A roll this size new would sell for $12 per foot, minus connectors! That amounts to a savings of over $2000! 1-5/8 Heliax is rated at 0.297 db loss per 100 feet @ 200MHz, and will withstand 11.3 KW. We also have several snap in hangers for the cable, as well as the tower leg brackets for the snap ins. The snap-ins will be $0.50 per piece, and the tower leg brackets $1.00 each. This is a NO SHIP item. Cable can be seen, purchased and picked up at the McMinn Co Amateur Radio Club Hamfest, July 21st, in Athens TN. See www.mcminnarc.com for more info. If you wish to purchase before the hamfest, contact Scott Duckworth, NA4IT, (423)263-1989 or email [EMAIL PROTECTED] and include Heliax in the subject.
[Repeater-Builder] Notch duplexer dumb question
I have a Motorola TDN7407A notch duplexer (in reality, a Motorola-branded Celwave 633-6A-2N) that I want to use for a low-power GMRS repeater. The ports are labeled HI and LO now for the dumb question, do those labelings refer to the NOTCH frequency or the pass frequency? Unfortunately, it is not labeled with the current tuning, and I don't have easy access to anything to sweep it with George, KA3HSW / WQGJ413
Re: [Repeater-Builder] Notch duplexer dumb question
George, I believe this is one of the 6 cavity mobile duplexers. If so then there is a notch only tuning and the bandpass is wide with no adjustment. I've used these and they work very well. I always tuned the lo for the lo freq and hi for hi no matter if hi/lo was rx or tx. 73, ron, n9ee/r From: George Henry [EMAIL PROTECTED] Date: 2007/07/10 Tue AM 08:56:16 CDT To: repeater-builder@yahoogroups.com Subject: [Repeater-Builder] Notch duplexer dumb question I have a Motorola TDN7407A notch duplexer (in reality, a Motorola-branded Celwave 633-6A-2N) that I want to use for a low-power GMRS repeater. The ports are labeled HI and LO now for the dumb question, do those labelings refer to the NOTCH frequency or the pass frequency? Unfortunately, it is not labeled with the current tuning, and I don't have easy access to anything to sweep it with George, KA3HSW / WQGJ413 Ron Wright, N9EE 727-376-6575 MICRO COMPUTER CONCEPTS Owner 146.64 repeater Tampa Bay, FL No tone, all are welcome.
Re: [Repeater-Builder] Notch duplexer dumb question
It is the pass frequency. - Original Message - From: George Henry To: repeater-builder@yahoogroups.com Sent: Tuesday, July 10, 2007 8:56 AM Subject: [Repeater-Builder] Notch duplexer dumb question I have a Motorola TDN7407A notch duplexer (in reality, a Motorola-branded Celwave 633-6A-2N) that I want to use for a low-power GMRS repeater. The ports are labeled HI and LO now for the dumb question, do those labelings refer to the NOTCH frequency or the pass frequency? Unfortunately, it is not labeled with the current tuning, and I don't have easy access to anything to sweep it with George, KA3HSW / WQGJ413
[Repeater-Builder] Re: Hello...
All, Thanks for the comments... Looks like I have plenty to research and keep me busy for a while. I notice alot of people here use converted comercial radios for repeaters. How available are these?? A quick search on e-bay did not show a large number of hits... but maybe the availability is cyclical... Thanks again, Lou --- In Repeater-Builder@yahoogroups.com, Nate Duehr [EMAIL PROTECTED] wrote: Hi Lou, I'll throw out my wishes for you to have fun and enjoy building a repeater, but I'll also throw up in the air my usual comment to all budding repeater-builder type folks... Find a local club that needs help. There's ALWAYS someone locally that needs help with an existing repeater or system! (Or move to Denver, we'll put you to work!!) Repeaters need maintenance, not a lot, if they're built right, but there's always something to be done/checked every year or so. And every few years, you might have some tower/antenna work to do, and every few other years maybe some measurements to take critically with good test gear to see if the repeater is still performing to baseline specifications that you measured a few years before that... and... things fail... or get blown up by lightning... Well, the list goes on and on... it never stops, really. After you get picky about audio you can start obsessing about that, and come up with a project list twice as long and difficult as the just get it on the air and working list! There's always something to analyze, think about, and try to make better... without making it worse. Many clubs/organizations are short of qualified folks to work on their systems. There's lots of radio operators out there, happy to use the systems, but the number of techs who'll work on them -- it is a very small group of people in most populated areas. In rural areas, you really might find 3-4 people total who REALLY do repeaters right. (Hint: Pick repeaters in your area that seem to have better performance than others in the area and then look up the callsign. Find out who owns/operates it and approach those people. FIND THOSE techs... they did it right.) If you read up on EVERYTHING you find at the Repeater-Builder website about your club/local organization's repeaters, and all the general information there -- and there's a LOT!... Then start asking around to find out who the REAL repeater techs are in your local organizations (hint: it's not always who talks about it the most on the air!), you'll probably find some of the best people you've ever met in Ham Radio. Try to meet a few people that do this stuff... get a feel for the local community of repeater builders. Many people think the folks in charge of certain clubs don't work with other clubs in the area, and often -- although not always -- this isn't true. Most of the folks doing this stuff do know and work with each other on problems, even if their clubs compete. Many repeater builder types are willing to Elmer new folks along in return for some help on their systems. NOT ALL are, though -- some are crotchety old grumpy coots who won't talk to anyone. Don't worry about it, all aspects of this hobby have both types. (GRIN) And their biggest turn-off will be if you show up once, and never come back. Make a commitment to stick around for a while, you'll learn some interesting things. Repeaters are fairly different from many types of Amateur Radio... a specialty if you will, within the hobby. And can be quite challenging to get right. Showing someone the ropes kinda requires a commitment from both sides that is a little notch above this just being a hobby. Especially if a lot of folks are counting on a particular repeater or repeater system. Okay, off the soap box... plenty of well-wishers here, and folks who'll answer questions. Off ya go! Find a repeater that needs fixing! (By the way, no harm done building a typical back-yard repeater to do some learning. Hopefully your area has some frequency pairs set aside for experimentation and/or non-protected use. Those are a great open playground where you can learn a lot, and not have to deal with coordinating the repeater at first... just be courteous to others also using those pairs, if your area has them.) Nate WY0X
Re: [Repeater-Builder] Notch duplexer dumb question
George, One other comment. The lo is for the lo passing freq and hi is the hi passing freq with the notch tuned for the other; on lo side tune for notch of hi freq. 73, ron, n9ee/r From: George Henry [EMAIL PROTECTED] Date: 2007/07/10 Tue AM 08:56:16 CDT To: repeater-builder@yahoogroups.com Subject: [Repeater-Builder] Notch duplexer dumb question I have a Motorola TDN7407A notch duplexer (in reality, a Motorola-branded Celwave 633-6A-2N) that I want to use for a low-power GMRS repeater. The ports are labeled HI and LO now for the dumb question, do those labelings refer to the NOTCH frequency or the pass frequency? Unfortunately, it is not labeled with the current tuning, and I don't have easy access to anything to sweep it with George, KA3HSW / WQGJ413 Ron Wright, N9EE 727-376-6575 MICRO COMPUTER CONCEPTS Owner 146.64 repeater Tampa Bay, FL No tone, all are welcome.
Re: [Repeater-Builder] seperation between 2 440 antenna's
Refer to the charts here for your answer. http://www.repeater-builder.com/antenna/separation.html Dan N8DJP 3. seperation between 2 440 antenna's Posted by: JOHN KIHL [EMAIL PROTECTED] johnkihl Date: Mon Jul 9, 2007 6:58 am ((PDT)) Good Afternoon, We are putting up a 440 repeater antenna with over 100watts and we are looking at putting a yagi directional 440 below it. What is the rule of thumb for seperation required, 15feet of 20? Thanks 73 kb3nqs [EMAIL PROTECTED] 800-741-5152 - Get the Yahoo! toolbar and be alerted to new email wherever you're surfing.
Re: [Repeater-Builder] Notch duplexer dumb question
I actually have seen those mobile duplexors labeled both ways, but commonly the labeling refers to what is connected. Low would be your 462 freq pass and would be tuned to reject 467. Most of those UHF mobile notch duplexors fairly broad banded and probably will not matter as long as YOU know how they are tuned. Danny KD4RAA On 7/10/07, George Henry [EMAIL PROTECTED] wrote: I have a Motorola TDN7407A notch duplexer (in reality, a Motorola-branded Celwave 633-6A-2N) that I want to use for a low-power GMRS repeater. The ports are labeled HI and LO now for the dumb question, do those labelings refer to the NOTCH frequency or the pass frequency? Unfortunately, it is not labeled with the current tuning, and I don't have easy access to anything to sweep it with George, KA3HSW / WQGJ413
[Repeater-Builder] FS: UHF Deltas - Chassis Only
Hi Guys, For those who missed them the first time around, I just acquired a bunch more of these chassis. They are UHF GE Deltas in the two low split ranges. From the Hall-Electronics site: Wide Band 16 Channel Capacity with Channel Guard, NO UHS 403- 423 50W 5 PPM N3A133 N3RR2W050TB and 410- 430 50W 5 PPM N3A139 N3SS2W050TB They didn't come with the X2212 but I have a bunch of spare eeproms, so I can sell them with or without. US$20 without X2212 or $US32 with X2212 plus shipping (parcel post from Kitchener, Ontario, Canada). These are the main chassis only and are very easy to set up for links, packet, or use two as a repeater. A great site with alignment information is here: http://www.commparts.com/ge_delta_1200b-s_mod.html Please reply directly. Tedd Doda, VE3TJD Lazer Audio and Electronics We've moved! Please see us at our new location: 2492 Cedar Creek RoadAyr, Ontario, Canada, N0B 1E0 Phone: 519-513-0377
Re: [Repeater-Builder] Motorola Pagers for telemetry
You need to check the receiver board to see what band it is on as the labels on the case may be totally inaccurate... the receiver part number will have a letter combination in it to determine the range. NRF is 900 mhz NRE is uhf NRD is vhf There are several bandsplits in VHF and uhf that the last 4 digits will identify We also have the tools to program them. They are xtal controlled but all other parameters are programmable Doug KD8B At 07:32 AM 7/10/2007, you wrote: I think the Advisor was either 512 or 1200 baud POCSG. The RF receiver section determined the frequency range and it plugged into the main board that was the decoder and display. If I remember correctly, you can just plug in the frequency band receiver that you wanted to use onto any main board and it will work. Somewhere, I think, I still have the programming stand and cable for the Advisor (if it is the bigger, older style Advisor). You needed this to program the pager, plus propriatory Motorloa software (don't know if I still have this). The big question is: do you have the password? There were companies that could hack the password or sell you a pager that has a known password. Without the password, there is no way that I know of resetting it. 73, Joe, k1ike -- Original message -- From: Nigel Johnson mailto:ve3id%40sympatico.ca[EMAIL PROTECTED] A few years ago I undertook to replace our old 300 baud telemetry system at VE3RPT with something a little more modern, and bought a POCSAG encoder and ordered some xtals for our command frequency and an old Motorola pager. Somewhere along the way, I lost the pager! I recently found a Motorola Advisor pager p/n A04KLB5662AA and was wondering if anybody out there has tech data on this, specifically if it is POCSAG and what the xtal formula is? Apparently the menus can also be programmed, does this use some kind of a RIB? any help would be appreciated 73 Nigel Johnson ve3id From:Nigel Johnson [EMAIL PROTECTED] To:Repeater-Builder@yahoogroups.com Subject:[Repeater-Builder] Motorola Pagers for telemetry Date:Tue, 10 Jul 2007 00:24:20 + Content-Type: Multipart/alternative; boundary=NextPart_Webmail_9m3u9jl4l_5057_1184067171_1 A few years ago I undertook to replace our old 300 baud telemetry system at VE3RPT with something a little more modern, and bought a POCSAG encoder and ordered some xtals for our command frequency and an old Motorola pager. Somewhere along the way, I lost the pager! I recently found a Motorola Advisor pager p/n A04KLB5662AA and was wondering if anybody out there has tech data on this, specifically if it is POCSAG and what the xtal formula is? Apparently the menus can also be programmed, does this use some kind of a RIB? any help would be appreciated 73 Nigel Johnson ve3id
Re: [Repeater-Builder] Re: Interference and t-1504 questions
Can you see if you can find your drawings on the loops? need to make up a couple. Thanks!! Tom W9SRV skipp025 [EMAIL PROTECTED] wrote: Hi Tom, The bp loops are pretty much just an SO-239 and the matching metal loop if you wanted to build some. I probably have diagram'd out the demensions of both the loops and bpbr probes if you end up having to roll your own. Contact the Railroad to see if you can find a warm body to work with. The remote controls boxes have an interesting failsafe to prevent runaway locos. Re-synce of the control boxes can be cumbersome with distant yard located engines so maybe working with them to avoid same frequency problems might save everyone serious travel time. Some of the control boxes I've seen have frequency agile settings. Just as a tongue in cheek comment... you could operate your own box and play train-set with the real deal. cheers, skipp tgundo2003 wrote: 1. Anyone have an extra set of loops of a T-1504 can? I have a spare can that has probes and I need to flip it over. 2. Has anyone had any problems with interference from the Railroad Locomotive Remote control and telemetry systems? They are on 452. and 457.. I have a UHF repeater near a railyard and they are clobbering the input at times. I had a DB products notch style in place and today I swapped it out for a T-1504 hoping to improve isolation from it. I have an extra can that if I can find some loops I can put on the reciever as well. Time will tell if it solves the problem, but I could still slightly hear it on weak signals into the repeater. Are the transmitters they are using sloppy? They have strong signals listening on a scanner and seem to be going 24/7. I wonder if anyone else has had to deal with this. Thanks! Tom W9SRV Yahoo! Groups Links - Take the Internet to Go: Yahoo!Go puts the Internet in your pocket: mail, news, photos more.
[Repeater-Builder] GE MASTR II and RC-1000V
I purchased a GE MASTR II with an RC-1000V controller and I am having a problem with it. When I power it on it transmits the ID and seems to be functioning like it should. However once on it has a hard time kicking into transmit mode. I think that it may be that the radio is not breaking squelch. I have no idea how this was setup and modified so it may just be that the squelch circuit is not right or not adjusted right, however I have not seen any squelch adjustment at all on the outside of the radio. Before I start to tear this thing apart and break anything that isn't already broken. Is there any way I can determine if the radio is breaking squelch or what is going on with receive? All I have is the control cable with the end cut off which is patched into a terminal strip that is then connected to the RC-1000V cable that goes to the DB25 on the back of the case. Does anyone have the wiring colors of the MASTR II control cable and/or the RC-1000V factory cable if there is such a thing? That might help in trouble shooting. Thanks, Vern KI4ONW
[Repeater-Builder] AP4800 controller processor
Hi folks, For a very long time, I've been looking for the Micro processor for the AP4800 repeater controller. Originally I bought it from John Bell, before he took ill, and sold the business. The chip got hit by lightening, I still have the old one somewhere at home. I will really like to get this controller going again, now that I got the repeater TX and RX going, any help will be greatly appreciated. v44kai.Joel.
[Repeater-Builder] Re Mitrek Icoms
I have been searching for the schematics for the KXN1086A and the KXN1088A mitrek icoms to no avail. I believe they are on the net somewhere. Also, there was a procedure to tune the side mounted inductor on the receive icom. I thought I had it printed but can't seem to locate it. When comparing two KXN1086A icoms, there appears to be a difference in their circuitry. One has what looks like five transistors, and the other three. It could be that two of the transistors are used as diodes. Could someone enlighten me on this. Thanks Doug VE5DA
Re: [Repeater-Builder] Notch duplexer dumb question
Thanks. That's what I suspected, but I wanted to be sure... George, KA3HSW / WQGJ413 -Original Message- From: Ron Wright [EMAIL PROTECTED] Sent: Jul 10, 2007 9:33 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Notch duplexer dumb question George, One other comment. The lo is for the lo passing freq and hi is the hi passing freq with the notch tuned for the other; on lo side tune for notch of hi freq. 73, ron, n9ee/r From: George Henry [EMAIL PROTECTED] Date: 2007/07/10 Tue AM 08:56:16 CDT To: repeater-builder@yahoogroups.com Subject: [Repeater-Builder] Notch duplexer dumb question I have a Motorola TDN7407A notch duplexer (in reality, a Motorola-branded Celwave 633-6A-2N) that I want to use for a low-power GMRS repeater. The ports are labeled HI and LO now for the dumb question, do those labelings refer to the NOTCH frequency or the pass frequency? Unfortunately, it is not labeled with the current tuning, and I don't have easy access to anything to sweep it with George, KA3HSW / WQGJ413
Re: [Repeater-Builder] Re Mitrek Icoms
The tuning procedure can be found at http://www.repeater-builder.com/mitrek/mitrek-channel-elements.html but is basically, plug in the element adjust the coil for maximum local oscillator injection (test set position 6) George, KA3HSW / WQGJ413 -Original Message- From: Doug [EMAIL PROTECTED] Sent: Jul 10, 2007 12:14 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re Mitrek Icoms I have been searching for the schematics for the KXN1086A and the KXN1088A mitrek icoms to no avail. I believe they are on the net somewhere. Also, there was a procedure to tune the side mounted inductor on the receive icom. I thought I had it printed but can't seem to locate it. When comparing two KXN1086A icoms, there appears to be a difference in their circuitry. One has what looks like five transistors, and the other three. It could be that two of the transistors are used as diodes. Could someone enlighten me on this. Thanks Doug VE5DA
Re: [Repeater-Builder] AP4800 controller processor
Hi Joel, The AP4800 is a 1994-era controller that used an Intel 8748 or 8749 microprocessor. Since the controller's operating system was stored in the processor's internal memory, you'll either have to find a programmed processor or get a blank one and have it programmed by someone who has the source code. 73, Bob, WA9FBO In a message dated 7/10/2007 12:15:18 PM Mountain Daylight Time, [EMAIL PROTECTED] writes: For a very long time, I've been looking for the Micro processor for the AP4800 repeater controller. Originally I bought it from John Bell, before he took ill, and sold the business. The chip got hit by lightening, I still have the old one somewhere at home. I will really like to get this controller going again, now that I got the repeater TX and RX going, any help will be greatly appreciated. ** See what's free at http://www.aol.com.
Re: [Repeater-Builder] Re Mitrek Icoms
At 12:45 PM 10/07/2007, you wrote: The tuning procedure can be found at http://www.repeater-builder.com/mitrek/mitrek-channel-elements.htmlhttp://www.repeater-builder.com/mitrek/mitrek-channel-elements.html but is basically, plug in the element adjust the coil for maximum local oscillator injection (test set position 6) George, KA3HSW / WQGJ413 -- Thanks George. I must of missed it.. But I have bookmarked now Doug VE5DA
Re: [Repeater-Builder] AP4800 controller processor
Hi Bob, I thought that may be the other way out, but, know nothing about programming proms nor have a programmer, nor anyone in my country to do such, do you know someone capable off such, Bob? any help will be appreciated. v44kai.Joel. - Original Message - From: [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Tuesday, July 10, 2007 2:00 PM Subject: Re: [Repeater-Builder] AP4800 controller processor Hi Joel, The AP4800 is a 1994-era controller that used an Intel 8748 or 8749 microprocessor. Since the controller's operating system was stored in the processor's internal memory, you'll either have to find a programmed processor or get a blank one and have it programmed by someone who has the source code. 73, Bob, WA9FBO In a message dated 7/10/2007 12:15:18 PM Mountain Daylight Time, [EMAIL PROTECTED] writes: For a very long time, I've been looking for the Micro processor for the AP4800 repeater controller. Originally I bought it from John Bell, before he took ill, and sold the business. The chip got hit by lightening, I still have the old one somewhere at home. I will really like to get this controller going again, now that I got the repeater TX and RX going, any help will be greatly appreciated. -- See what's free at AOL.com. -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.476 / Virus Database: 269.10.2/893 - Release Date: 7/9/2007 5:22 PM
RE: [Repeater-Builder] Notch duplexer dumb question
On some it does matter. You can not reverse the high and low and still have minimum loss for the pass frequency wanted. The notch is usually not symmetrical and it will have more loss on one side than on the other. This problem is run into sometimes when trying to move one of those duplexers a long way from the design frequency. As you tune the notch a long ways the ultimate or best pass side (where there is minimum insertion loss) gets shifted to the opposite side from where it was originally. Most of those have an internal capacitor that you can't get to. 73 Gary K4FMX _ From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Danny Musten Sent: Tuesday, July 10, 2007 9:44 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Notch duplexer dumb question I actually have seen those mobile duplexors labeled both ways, but commonly the labeling refers to what is connected. Low would be your 462 freq pass and would be tuned to reject 467. Most of those UHF mobile notch duplexors fairly broad banded and probably will not matter as long as YOU know how they are tuned. Danny KD4RAA On 7/10/07, George Henry [EMAIL PROTECTED] wrote: I have a Motorola TDN7407A notch duplexer (in reality, a Motorola-branded Celwave 633-6A-2N) that I want to use for a low-power GMRS repeater. The ports are labeled HI and LO now for the dumb question, do those labelings refer to the NOTCH frequency or the pass frequency? Unfortunately, it is not labeled with the current tuning, and I don't have easy access to anything to sweep it with George, KA3HSW / WQGJ413
Re: [Repeater-Builder] Motorola Pagers for telemetry
Hmmm, if it is a password issue that can probably be got around by getting directly into the micro, the only question is will it be worth it? I teach micro-controller at college so that should not be a problem (maybe even a student project :-) ) Any info you have will be appreciated I is the older advisor from what I see of the published pictures 73 Nigel ve3id [EMAIL PROTECTED] wrote: I think the Advisor was either 512 or 1200 baud POCSG. The RF receiver section determined the frequency range and it plugged into the main board that was the decoder and display. If I remember correctly, you can just plug in the frequency band receiver that you wanted to use onto any main board and it will work. Somewhere, I think, I still have the programming stand and cable for the Advisor (if it is the bigger, older style Advisor). You needed this to program the pager, plus propriatory Motorloa software (don't know if I still have this). The big question is: do you have the password? There were companies that could hack the password or sell you a pager that has a known password. Without the password, there is no way that I know of resetting it. 73, Joe, k1ike -- Original message -- From: Nigel Johnson [EMAIL PROTECTED] mailto:ve3id%40sympatico.ca A few years ago I undertook to replace our old 300 baud telemetry system at VE3RPT with something a little more modern, and bought a POCSAG encoder and ordered some xtals for our command frequency and an old Motorola pager. Somewhere along the way, I lost the pager! I recently found a Motorola Advisor pager p/n A04KLB5662AA and was wondering if anybody out there has tech data on this, specifically if it is POCSAG and what the xtal formula is? Apparently the menus can also be programmed, does this use some kind of a RIB? any help would be appreciated 73 Nigel Johnson ve3id Subject: [Repeater-Builder] Motorola Pagers for telemetry From: Nigel Johnson [EMAIL PROTECTED] Date: Tue, 10 Jul 2007 00:24:20 + To: Repeater-Builder@yahoogroups.com To: Repeater-Builder@yahoogroups.com A few years ago I undertook to replace our old 300 baud telemetry system at VE3RPT with something a little more modern, and bought a POCSAG encoder and ordered some xtals for our command frequency and an old Motorola pager. Somewhere along the way, I lost the pager! I recently found a Motorola Advisor pager p/n A04KLB5662AA and was wondering if anybody out there has tech data on this, specifically if it is POCSAG and what the xtal formula is? Apparently the menus can also be programmed, does this use some kind of a RIB? any help would be appreciated 73 Nigel Johnson ve3id No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.476 / Virus Database: 269.10.2/893 - Release Date: 2007-07-09 17:22 -- Nigel Johnson MSc., MIEEE, MCSE VE3ID/G4AJQ/VA3MCU http://nigel.homelinux.net http://va3mcu.ham-radio-op.net You can reach me by voice on Skype: TILBURY2591 If time travel ever will be possible, it already is. Ask me again yesterday This e-mail is not and cannot, by its nature, be confidential. En route from me to you, it will pass across the public Internet, easily readable by any number of system administrators along the way. Nigel Johnson [EMAIL PROTECTED]
Re: [Repeater-Builder] AP4800 controller processor
Hi Joel, I thought that may be the other way out, but, know nothing about programming proms nor have a programmer, nor anyone in my country to do such, do you know someone capable off such, Bob? any help will be appreciated. Programming the micro isn't as big of a problem as locating the source code. I have a one-page version 1 document that says source code can be purchased by controller owners, and a one-page version 2 document that says source code is not available. I don't know who Mr. Bell sold his company to, but I think that's the guy you want. 73, Bob, WA9FBO ** See what's free at http://www.aol.com.
Re: [Repeater-Builder] GE MASTR II and RC-1000V
Vern, One question. What do you mean hard time kicking into transmit mode??? Are you refering to having to give strong signal into the repeater or long key into the repeater to bring up??? The RC-1000V has a anti-kerchunk filter that requires a time delay before it keys the repeater. This can be turned on and off. Might be more specific on the problem. 73, ron, n9ee/r From: mung_bungholio [EMAIL PROTECTED] Date: 2007/07/10 Tue AM 10:21:31 CDT To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] GE MASTR II and RC-1000V I purchased a GE MASTR II with an RC-1000V controller and I am having a problem with it. When I power it on it transmits the ID and seems to be functioning like it should. However once on it has a hard time kicking into transmit mode. I think that it may be that the radio is not breaking squelch. I have no idea how this was setup and modified so it may just be that the squelch circuit is not right or not adjusted right, however I have not seen any squelch adjustment at all on the outside of the radio. Before I start to tear this thing apart and break anything that isn't already broken. Is there any way I can determine if the radio is breaking squelch or what is going on with receive? All I have is the control cable with the end cut off which is patched into a terminal strip that is then connected to the RC-1000V cable that goes to the DB25 on the back of the case. Does anyone have the wiring colors of the MASTR II control cable and/or the RC-1000V factory cable if there is such a thing? That might help in trouble shooting. Thanks, Vern KI4ONW Ron Wright, N9EE 727-376-6575 MICRO COMPUTER CONCEPTS Owner 146.64 repeater Tampa Bay, FL No tone, all are welcome.
[Repeater-Builder] crystal/channel element compensation..
OK, I usually use International, but how is Bomar doing these days, quality-wise? ICM seems to be pretty pricey these days. Bomar says $35 for re-crystalling a channel element. (I assume that means compensating as well). Thoughts welcome.. na6df dave
Re: [Repeater-Builder] crystal/channel element compensation..
years ago we switched from ICM to BOMAR and never had any problems. - Original Message - From: na6df To: Repeater-Builder@yahoogroups.com Sent: Tuesday, July 10, 2007 6:55 PM Subject: [Repeater-Builder] crystal/channel element compensation.. OK, I usually use International, but how is Bomar doing these days, quality-wise? ICM seems to be pretty pricey these days. Bomar says $35 for re-crystalling a channel element. (I assume that means compensating as well). Thoughts welcome.. na6df dave
Re: [Repeater-Builder] crystal/channel element compensation..
Do NOT assume anything. Always ask. ICM gets about $50 to make a new crystal, install it in your channel element, and do the full compensation on it. A friend sent in two elements and got them back all done in about 2 weeks last month. Hard to beat that kind of service. And of course they worked first time. If you've had good luck with ICM, I'd stay with them. Bob M. == --- na6df [EMAIL PROTECTED] wrote: OK, I usually use International, but how is Bomar doing these days, quality-wise? ICM seems to be pretty pricey these days. Bomar says $35 for re-crystalling a channel element. (I assume that means compensating as well). Thoughts welcome.. na6df dave Be a better Heartthrob. Get better relationship answers from someone who knows. Yahoo! Answers - Check it out. http://answers.yahoo.com/dir/?link=listsid=396545433
[Repeater-Builder] R-100 repeater
Still have the R-100 for sale DPL model and also a 2nd R-100 with a Zetron 37 tone panel on it, so it will do 2 PL tones and ID. thanks John
Re: [Repeater-Builder] R-100 repeater
Hi John, what are you asking for the R-100?I have some local guys talking about a GMRS repeater.If they do decide to do it the R-100 should do the trick. Thanks Don N5SVK - Original Message - From: Maire-Radios To: [EMAIL PROTECTED] ; [EMAIL PROTECTED] ; Repeater-Builder@yahoogroups.com Sent: Tuesday, July 10, 2007 6:25 PM Subject: [Repeater-Builder] R-100 repeater Still have the R-100 for sale DPL model and also a 2nd R-100 with a Zetron 37 tone panel on it, so it will do 2 PL tones and ID. thanks John
Re: [Repeater-Builder] R-100 repeater
what are you asking for the one without the controller? Dirk - Original Message - From: Maire-Radios To: [EMAIL PROTECTED] ; [EMAIL PROTECTED] ; Repeater-Builder@yahoogroups.com Sent: Tuesday, July 10, 2007 5:25 PM Subject: [Repeater-Builder] R-100 repeater Still have the R-100 for sale DPL model and also a 2nd R-100 with a Zetron 37 tone panel on it, so it will do 2 PL tones and ID. thanks John -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.476 / Virus Database: 269.10.2/893 - Release Date: 7/9/2007 5:22 PM
Re: [Repeater-Builder] Re: Hello...
Do an ebay search for ge mastr. You will find a large number of GE Base stations at the present time that can be operated as repeaters listed. 73 - Jim W5ZIT -Original Message- From: lou_c1357 [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Tue, 10 Jul 2007 6:43 am Subject: [Repeater-Builder] Re: Hello... All, Thanks for the comments... Looks like I have plenty to research and keep me busy for a while. I notice alot of people here use converted comercial radios for repeaters. How available are these?? A quick search on e-bay did not show a large number of hits... but maybe the availability is cyclical... Thanks again, Lou --- In Repeater-Builder@yahoogroups.com, Nate Duehr [EMAIL PROTECTED] wrote: Hi Lou, I'll throw out my wishes for you to have fun and enjoy building a repeater, but I'll also throw up in the air my usual comment to all budding repeater-builder type folks... Find a local club that needs help. There's ALWAYS someone locally that needs help with an existing repeater or system! (Or move to Denver, we'll put you to work!!) Repeaters need maintenance, not a lot, if they're built right, but there's always something to be done/checked every year or so. And every few years, you might have some tower/antenna work to do, and every few other years maybe some measurements to take critically with good test gear to see if the repeater is still performing to baseline specifications that you measured a few years before that... and... things fail... or get blown up by lightning... Well, the list goes on and on... it never stops, really. After you get picky about audio you can start obsessing about that, and come up with a project list twice as long and difficult as the just get it on the air and working list! There's always something to analyze, think about, and try to make better... without making it worse. Many clubs/organizations are short of qualified folks to work on their systems. There's lots of radio operators out there, happy to use the systems, but the number of techs who'll work on them -- it is a very small group of people in most populated areas. In rural areas, you really might find 3-4 people total who REALLY do repeaters right. (Hint: Pick repeaters in your area that seem to have better performance than others in the area and then look up the callsign. Find out who owns/operates it and approach those people. FIND THOSE techs... they did it right.) If you read up on EVERYTHING you find at the Repeater-Builder website about your club/local organization's repeaters, and all the general information there -- and there's a LOT!... Then start asking around to find out who the REAL repeater techs are in your local organizations (hint: it's not always who talks about it the most on the air!), you'll probably find some of the best people you've ever met in Ham Radio. Try to meet a few people that do this stuff... get a feel for the local community of repeater builders. Many people think the folks in charge of certain clubs don't work with other clubs in the area, and often -- although not always -- this isn't true. Most of the folks doing this stuff do know and work with each other on problems, even if their clubs compete. Many repeater builder types are willing to Elmer new folks along in return for some help on their systems. NOT ALL are, though -- some are crotchety old grumpy coots who won't talk to anyone. Don't worry about it, all aspects of this hobby have both types. (GRIN) And their biggest turn-off will be if you show up once, and never come back. Make a commitment to stick around for a while, you'll learn some interesting things. Repeaters are fairly different from many types of Amateur Radio... a specialty if you will, within the hobby. And can be quite challenging to get right. Showing someone the ropes kinda requires a commitment from both sides that is a little notch above this just being a hobby. Especially if a lot of folks are counting on a particular repeater or repeater system. Okay, off the soap box... plenty of well-wishers here, and folks who'll answer questions. Off ya go! Find a repeater that needs fixing! (By the way, no harm done building a typical back-yard repeater to do some learning. Hopefully your area has some frequency pairs set aside for experimentation and/or non-protected use. Those are a great open playground where you can learn a lot, and not have to deal with coordinating the repeater at first... just be courteous to others also using those pairs, if your area has them.) Nate WY0X Check Out the new free AIM(R) Mail -- Unlimited storage and industry-leading spam and email virus protection.
Re: [Repeater-Builder] R-100 repeater
well the R-100 DPL unit $145.00 also covers shipping in the US 48 states. current 462.725 DPL 125 - Original Message - From: N2PDQ To: Repeater-Builder@yahoogroups.com Sent: Tuesday, July 10, 2007 7:48 PM Subject: Re: [Repeater-Builder] R-100 repeater what are you asking for the one without the controller? Dirk - Original Message - From: Maire-Radios To: [EMAIL PROTECTED] ; [EMAIL PROTECTED] ; Repeater-Builder@yahoogroups.com Sent: Tuesday, July 10, 2007 5:25 PM Subject: [Repeater-Builder] R-100 repeater Still have the R-100 for sale DPL model and also a 2nd R-100 with a Zetron 37 tone panel on it, so it will do 2 PL tones and ID. thanks John No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.476 / Virus Database: 269.10.2/893 - Release Date: 7/9/2007 5:22 PM
Re: [Repeater-Builder] R-100 repeater
well the first R-100 is on 462.725 DPL 125$145.00 and covers shipping in the 48 states. - Original Message - From: Don Hejl To: Repeater-Builder@yahoogroups.com Sent: Tuesday, July 10, 2007 7:51 PM Subject: Re: [Repeater-Builder] R-100 repeater Hi John, what are you asking for the R-100?I have some local guys talking about a GMRS repeater.If they do decide to do it the R-100 should do the trick. Thanks Don N5SVK - Original Message - From: Maire-Radios To: [EMAIL PROTECTED] ; [EMAIL PROTECTED] ; Repeater-Builder@yahoogroups.com Sent: Tuesday, July 10, 2007 6:25 PM Subject: [Repeater-Builder] R-100 repeater Still have the R-100 for sale DPL model and also a 2nd R-100 with a Zetron 37 tone panel on it, so it will do 2 PL tones and ID. thanks John
Re: [Repeater-Builder] crystal/channel element compensation..
My last two dealings (within last two years) with Bomar have me skeptical. One GE ICOM had to go back because it was drifting all over the place and I did pay for the temperature compensation. I told them to take their time when I returned it as I wanted it done right. This was a UHF 2C. They had it returned in a little over a week - certainly a bit hurried. I also had some GE crystal elements sent in for re-crystal and temperature compensation and all of them came back with the same comp caps installed. I called and asked their engineering department and was told they usually work fine with the existing capacitors. It didn't leave me with a warm and fuzzy feeling. Next time back to ICM. Chuck WB2EDV - Original Message - From: na6df [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Tuesday, July 10, 2007 6:55 PM Subject: [Repeater-Builder] crystal/channel element compensation.. OK, I usually use International, but how is Bomar doing these days, quality-wise? ICM seems to be pretty pricey these days. Bomar says $35 for re-crystalling a channel element. (I assume that means compensating as well). Thoughts welcome.. na6df dave Yahoo! Groups Links
[Repeater-Builder] Re: Icom IC-3at as a remote
Robert, if you are using the external mic connector to key the radio, you will have to key the mic line by using a resistor to ground versus directly to ground. The radio goes into TX mode when current is pulled through the mic line. If you are paralleling the internal PTT switch, this does not apply. You can search for one of the sites with the old ACC controller info, and there is an appnote on hooking the 2-, 3-, and 4- radios to their units that shows PTT and mic audio connections. ACC used the FC-1 board to interface the controller logic to the radio. Mike - w5jr - via arrl.net - Milton, GA
Re: [Repeater-Builder] crystal/channel element compensation..
OK, I usually use International, but how is Bomar doing these days, quality-wise? ICM seems to be pretty pricey these days. Bomar says $35 for re-crystalling a channel element. (I assume that means compensating as well). Thoughts welcome.. na6df dave Frankly, looking at the big picture, with gas at $3/gal and a vehicle that gets about 18 MPG, I can easily cost-justify the extra $25 to ICM to make sure it's always done right, since my closest repeater is a 50 mile round-trip from the house, and the furthest is over 100 miles round-trip. We can just go back up and fix it later isn't in my vocabulary anymore. :-) -- Nate Duehr, WY0X [EMAIL PROTECTED]
RE: [Repeater-Builder] Notch duplexer dumb question
George, A good question is never a dumb one. Although it may not be perfectly clear to everyone, Celwave marks their duplexers with LOW and HIGH to indicate the frequency that it will PASS. Thus, in a GMRS repeater system, the 462 MHz output of the transmitter will connect to the LOW connector, and the 467 MHz input to the receiver will connect to the HIGH connector. The Celwave 633-series duplexers are notch-only devices which are suitable only for TX-RX spacings above 3 MHz. The internal coupling loops are adjusted during manufacture for a specific frequency range, spacing, and insertion loss. Even though the tuning screws can be adjusted to move the band of operation a few MHz, the performance falls off very rapidly once the tuning is moved more than 2 or 3 MHz. As others have noted, the internal adjustments have been optimized for specific frequencies, and the tuning cannot be inverted without major degradation. At one time, the connectors on such duplexers were labeled RX and TX, and some clueless tweakers actually tried to change the input and output tuning instead of simply switching the connectors! Moreover, the design of notch duplexers is asymmetrical, so it may not be possible to invert the tuning. The tuning procedure for the Celwave 633-series duplexer calls for adjusting the screws on the three LOW side cavities for maximum rejection of the receive (high) frequency, and for adjusting the screws on the three HIGH side cavities for maximum rejection of the transmit (low) frequency. Bear in mind that notch (mobile) duplexers have no adjustment for pass frequencies, and what you get for bandpass insertion loss is what you get. In other words, tune for the notch only. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of George Henry Sent: Tuesday, July 10, 2007 6:56 AM To: repeater-builder@yahoogroups.com Subject: [Repeater-Builder] Notch duplexer dumb question I have a Motorola TDN7407A notch duplexer (in reality, a Motorola-branded Celwave 633-6A-2N) that I want to use for a low-power GMRS repeater. The ports are labeled HI and LO now for the dumb question, do those labelings refer to the NOTCH frequency or the pass frequency? Unfortunately, it is not labeled with the current tuning, and I don't have easy access to anything to sweep it with George, KA3HSW / WQGJ413
RE: [Repeater-Builder] crystal/channel element compensation..
Bravo to you for doing the right thing! Far too many people these days are in a rush to get a repeater on the air right away, and figure that it's okay to bypass the compensation steps. I guess they have the money to go back and fix the problem they created, later and at considerably greater cost. I went to the do it right the first time school. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Chuck Kelsey Sent: Tuesday, July 10, 2007 7:09 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] crystal/channel element compensation.. My last two dealings (within last two years) with Bomar have me skeptical. One GE ICOM had to go back because it was drifting all over the place and I did pay for the temperature compensation. I told them to take their time when I returned it as I wanted it done right. This was a UHF 2C. They had it returned in a little over a week - certainly a bit hurried. I also had some GE crystal elements sent in for re-crystal and temperature compensation and all of them came back with the same comp caps installed. I called and asked their engineering department and was told they usually work fine with the existing capacitors. It didn't leave me with a warm and fuzzy feeling. Next time back to ICM. Chuck WB2EDV - Original Message - From: na6df [EMAIL PROTECTED] mailto:jammerdave%40gmail.com To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Sent: Tuesday, July 10, 2007 6:55 PM Subject: [Repeater-Builder] crystal/channel element compensation.. OK, I usually use International, but how is Bomar doing these days, quality-wise? ICM seems to be pretty pricey these days. Bomar says $35 for re-crystalling a channel element. (I assume that means compensating as well). Thoughts welcome.. na6df dave
Re: [Repeater-Builder] crystal/channel element compensation..
The last time I checked with Bomar, they put a crystal into the element, ensured that it worked and modulated correctly then send it out the door. It never went through temperature compensation. They may have changed. 73 Glenn WB4UIV At 05:55 PM 07/10/07, you wrote: OK, I usually use International, but how is Bomar doing these days, quality-wise? ICM seems to be pretty pricey these days. Bomar says $35 for re-crystalling a channel element. (I assume that means compensating as well). Thoughts welcome.. na6df dave Yahoo! Groups Links
RE: [Repeater-Builder] Notch duplexer dumb question
This is a pretty good visual aid: http://prestonmoore.com/images/duplexed.jpg Take the Internet to Go: Yahoo!Go puts the Internet in your pocket: mail, news, photos more. http://mobile.yahoo.com/go?refer=1GNXIC
RE: [Repeater-Builder] crystal/channel element compensation..
At 7/10/2007 20:42, you wrote: Bravo to you for doing the right thing! Far too many people these days are in a rush to get a repeater on the air right away, and figure that it's okay to bypass the compensation steps. I guess they have the money to go back and fix the problem they created, later and at considerably greater cost. I went to the do it right the first time school. My experience with ICM has been rather negative, so considering how much they charge I stay away. I've been using West Crystal for a few years now am quite happy with the results; I only wish the exchange rate wasn't so unfavorable. I don't bother with compensation; I temperature stabilize. For me, it's the right thing. Bob NO6B P.S.: Anyone know of a source for retrofit DDS modules for G.E. MVPs? The DDS chips are getting cheap enough now that a finished product for older LMR equipment should be economically viable.
RE: [Repeater-Builder] Notch duplexer dumb question (while on the subject...)
While on the mobile duplexer subject. Is it possible to destroy a reject, or a Bp/Br for that matter, by reversing the proper TX/RX connections? I thought someone said that reversing the connections on a reject duplexer might damage it. I am guessing it might really fry the transmitter. Preston N5YIZ TV dinner still cooling? Check out Tonight's Picks on Yahoo! TV. http://tv.yahoo.com/
Re: [Repeater-Builder] R-100 repeater
Hello again John,If you will send me your mailing address I will take the R-100 without the controller.As soon as I get your info I will send you a postal money order for $145.00 Don N5SVK - Original Message - From: Maire-Radios To: Repeater-Builder@yahoogroups.com Sent: Tuesday, July 10, 2007 8:38 PM Subject: Re: [Repeater-Builder] R-100 repeater well the first R-100 is on 462.725 DPL 125$145.00 and covers shipping in the 48 states. - Original Message - From: Don Hejl To: Repeater-Builder@yahoogroups.com Sent: Tuesday, July 10, 2007 7:51 PM Subject: Re: [Repeater-Builder] R-100 repeater Hi John, what are you asking for the R-100?I have some local guys talking about a GMRS repeater.If they do decide to do it the R-100 should do the trick. Thanks Don N5SVK - Original Message - From: Maire-Radios To: [EMAIL PROTECTED] ; [EMAIL PROTECTED] ; Repeater-Builder@yahoogroups.com Sent: Tuesday, July 10, 2007 6:25 PM Subject: [Repeater-Builder] R-100 repeater Still have the R-100 for sale DPL model and also a 2nd R-100 with a Zetron 37 tone panel on it, so it will do 2 PL tones and ID. thanks John
RE: [Repeater-Builder] Notch duplexer dumb question (while on the subject...)
Preston, I doubt it. At worst, the duplexer will have excessive insertion loss and be a poor performer, but most properly-designed repeaters or transceivers are protected against damage from mismatched loads. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Preston Moore Sent: Tuesday, July 10, 2007 8:59 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Notch duplexer dumb question (while on the subject...) While on the mobile duplexer subject. Is it possible to destroy a reject, or a Bp/Br for that matter, by reversing the proper TX/RX connections? I thought someone said that reversing the connections on a reject duplexer might damage it. I am guessing it might really fry the transmitter. Preston N5YIZ
