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Use 6 dB pads on the TG output and SA inputs for the most accurate filter alignment. The possible detuned duplexer notches will be on the RX cans that are tuned to reject the TX frequency. John

Has anyone figured out how to do the out-of-band hex edit and the region code edit for the CDM/HT CPS running on Windows 10? If not, I have, and I've only tested it with my HT-1250 lowband that I've got on 6m. The hex edit addresses for out-of-band programming in Windows 10 are different than the article on Repeater Builder, but the values you change are the same. I've made notes on what the addresses are. I've also got notes on where to find the serialized string for the region code mod. I changed it to the value in the Repeater Builder article. I don't have a radio handy to test this on, but I don't see why it wouldn't work. I don't know if anyone had shared this info in the group or not. If not, I would be more than happy to share my notes if anyone would like to do some further testing and possibly add to the website if all is good. Again, I've only tested this with my lowband HT-1250 on 6m, and everything worked fine; however, this would be at your own risk. 73, Terry KM5UQ

Hello Group, I'm in the investigation stage of relocating a repeater to a FM broadcast tower site. I've been on several LMR towers and not had any issues but wanted to see if there is any best practices I could learn from on what equipment should be mandatory for being on a FM broadcast tower site. I have listed what I have so far. Any additional equipment please 1. The repeater will be on the UHF spectrum of the ham radio side. 2. It will be running a Kenwood NXR-1800K2 repeater with TXRX duplexers with a 100DB isolation between sides. 3. Height will be between 350 to 400 ft 5. Cable is 1 5/8" hard line that was run but never used and capped off. 4. Antenna will be a commander technologies fiberglass antenna being side mounted on the tower with polyphaser lightening protection attached and grounded. 4a. Jumpers will be 1/2 hardline between the antenna and 1 5/8" and the same going into the building. 5. The radio station broadcast on 93.7 a with a ERP of 37,000 Watts and there antenna is at the 550ft mark. 6. There only two 800Mhz commercial antenna's on the tower and a couple of Wifi provider dishes. I'll be above all of that equipment. Thanks! Steven H. N8RLW

All, I have a MTR2000 here that I have interfaced to a USB-RIM module, I have it working in COS mode but want to run a ctcss code on it. I was curious does anyone know if anything special needs to be set for the ctcss valid pin to go high to tell the RIM that the correct PL/ctcss is valid? I cant get the ctcss lead to go high to tell the RIM that there's a valid ctcss code. When I key up my handheld with the correct ctcss code on it it initially says keyed under the signal status. Ive tried several mixtures of settings. Under Audio I have Analog RX Activation set to PL Under channel info I have decoder set to RX PL of 67.0 I am using the ICS-CTRL MTR2000 Adapter board that goes to a DB9. Its pulling from C2 for PL Detect & B4 for COR. Thanks! --Don

I live across a valley from a ski mountain. My house is ~300' above the valley floor on the edge of a steep hill. Top of the ski mountain is ~3000' above the valley floor. Cell phone coverage on the mountain is poor. Using FRS or GRMS simplex to meet up with friends / family works ok but not great. I haven't done extensive testing but I know I can communicate from some areas of the mountain to my house using (2) Radioddity GM-30s. If I had a repeater at my house, I'm hoping I could get better communications on the mountain. Does this seem reasonable? I've started the research journey on this a couple times before becoming overwhelmed with opinions. I'm new to radio but I have experience in other electronics, machine tools, etc. With guidance I'm confident I can execute this project successfully. Snow and wind are certainties at this location. Initial temporary test would be from a balcony powered from an outdoor outlet. Initial test would not self ID. Improvements could include: roof mounted antenna, self ID, outdoor electronics enclosure (to reduce lightning risk to house), hardwire or in use receptacle cover. My understanding is I need: Antenna Hardline. Consensus seems to be on LDF4-50A Duplexer Repeater / radio pair. I don't have access to radio specific tools but multimeter use, soldering, desoldering, wiring, mounting, etc. are within my skill set. Thanks for looking.

Can anyone tell me what radio NSN6048A was used with? Thanks Glenn WB4UIV -- ----------------------------------------------------------------------- Glenn Little ARRL Technical Specialist QCWA LM 28417 Amateur Callsign: WB4UIV wb4uiv@... AMSAT LM 2178 QTH: Goose Creek, SC USA (EM92xx) USSVI, FRA, NRA-LM ARRL TAPR "It is not the class of license that the Amateur holds but the class of the Amateur that holds the license"

Does anyone know of any school bus company or school district currently using SCHOOL RADIO, (Brand) PTT over Cellular mobile and portable radios? If so, please advise as I am looking for a good reference for this new radio technology. It is similar to Digi-Talk, by the same company. Thank you. Regards, Charles F. Adams K3HKZ Industrial Communications Co. 121 N Sitgreaves Street Easton, PA 18042 Office 610-253-1214 Cell 610-360-0050 Fax 610-253-4504 From: [email protected] <[email protected]> On Behalf Of Pro4XComm via groups.io Sent: Wednesday, March 12, 2025 12:58 PM To: [email protected] Subject: [repeater-builder] Tektronix Y400 vs Anritsu Cell Master Does anyone have experience with both the Tektronix Y400 with YBA250 and YBT250 modules and the Anritsu Cell Master? I’m trying to decide on one for an entry level SA and VNA to use for radios, antenna systems and tuning duplexers. It’s not clear whether the Tektronix has a TG like the Anritsu and whether it would be suitable for tuning duplexers. I’m trying to determine whether I should lean towards one over the other. Any feedback would be greatly appreciated!

I have a Kenwoot TKR 851 UHF repeater for sale. It is a 25W unit but set for 12 watts since I was told the last owner used it on an amp. Repeater is in good shape although I never put it on the air but I was told it works great. $600 shipped. Thanks Chad

I had about a 10 minute chat with Bob at Henry Radio Wednesday afternoon. So here is what he had to say: 1. Henry Radio did not negotiate or in any way shape or form purchase T.P.L. Amplifiers. As such, they have no drawings or schematics for T.P.L. Amplifiers. They have no spare parts, boards, or otherwise for T.P.L. products. 2. Henry did purchase the domain registry and old voice phone number to T.P.L. The phone forwards straight to Bob's cell. 3. Henry DOES repair T.P.L. amplifiers. Turn around time is a little longer (a few weeks to a month on average) than on Henry products, because with no schematics, they basically are reverse engineering the circuits in the diagnosis process. They have 2 dedicated 2-way technicians that work on the T.P.L. products, while the other bench technicians work on the Henry line. 4. The old man Henry has retired. Bob is apparently in charge now, and will chat with anyone that has questions. No R.M.A. number is required. Just go to the Henry website and print out a hard copy of their repair form and include it with your T.P.L. amplifier for service. 5.Also, Henry is once again repairing their own name brand 220 MHz amateur amplifiers. They had ceased repairing them about 2 years ago, and refused repair on one of mine that I had purchased from them back then. If you have further questions, reach out to Bob directly during Henry's normal business hours. N5ZUA

Our group got the MTR-2000's and they power up, so very good sign. However, putting an RSS software on it, the RSS fails to read the MTR.. Tried 2 different cables (FTDI, 2102) Also have a RIB cable to put on it.... (Com ports match) I suspect the RSS software might not be correct. What version to use??? And. do I need a specific OS (WinXP, 7) or what? If anyone has a codeplug to modify, that would be appreciated.... One of them codes out to 100w and 2 meter capable! Peter (I have programmed CDM's, M1225's and 4550's...)

Hello everyone is the subject says I have a new to me Motorola r-2001b. It came with the cover and all the accessories except for the CRT sun shield. CRT is in good shape. I was looking at the unit when I purchased it and it had a image on the CRT that followed when pressing different functions. When I got it home and turned it on of course it did nothing. Horizontal sweep was extremely pinched almost down to a vertical line, almost. Sometimes the monitor will boot other times it does a partial Boot and sits there and screams with a single tone. I do see some suspect capacitors that look like they have corrosion underneath the translucent shrink wrap. From the manufacturer codes it looks like this one was made sometime in 1982. It's a good clean shape. I am suspecting power supply issues to start. The capacitors in question are on the power supply modules. The two large computer type capacitors show no signs of corrosion or leakage. I will be getting the LCR meter out and measuring the capacitance and ESR of those large computer capacitors. And I will also be replacing the suspect ones. Other than not pushing the test probe too far down into test point 201, is there anything else to look at that is a common failure point? When the CRT did have an image it had a ripple wave in the screen in the horizontal plane moving slowly up the screen. Any experts out here on this old dog? -- Thanks, Randy. randy.ab9go@...

This topic might be a little personal preference to some people. What I'm looking for is the following. 1. Which models of Motorola gear will work best in the ham radio DMR space. Example: Motorola model 5000E with Serial number X to Y works well. 2. Which models are most likely to show up in the used market for ham use. 3. Which one will hook up to DMR network without having to jury rig everything. I'm not as familiar with the Motorola gear as I as I am with Hyteria and Kenwood. Thanks! Steven H N8RLW

Greetings all, I have enjoyed reviewing numerous posts on this group over the past several months, especially as I plan and have started a build of a 25W iCOM ID-2010V based mobile repeater on VHF. I'm writing to ask for pointers on finding a duplexer to purchase. I already own the iCOM repeater controller. My application is primarily for portable use, supporting both Olympus rally and Oregon Trail Rally in WA and OR respectively. Recognizing the challenges of a VHF portable, I have a trailer in hand with an onboard power system, mast, antenna, and enough space to mount and travel with a full sized 4 or 6 cavity system. Requirements: 25W and .6MHz frequency pair spacing. Please go easy on me as I am ~4 year HAM and this is the first repeater I have worked on from scratch. I've spent some time with local clubs at repeater sites and have worked in partnership on a DIY dispersed 2 site repeater using 2X TYT 9800s in VHF config with UHF crossband interlink before. Any help would be greatly appreciated, specifically sourcing a duplexer best suited for portable, and advice on mounting it for vibration mitigation. Perfectly happy to purchase and adopt used equipment in good shape. I also welcome advice on what models or types to shy away from. Lastly, if you are in WA / OR and interested in volunteering for Rally Communications support, please have a look at my QRZ. 73 all, Devin H. Devin Hamilton N7IQZ

I have zero experience tuning duplexers but I have been following the repeater builder list for several years, trying to learn and because it is so interesting. Recently, our club received a VHF DB Products 4060 four can duplexer from what was reportedly a working repeater (SK, I think). I seem to have foolishly volunteered to check it out and retune it to a new VHF pair. I have a nano VNA, a sig gen and SA to work with as well as lots of dummy loads, attenuators, HTs etc. But zero experience so I am begging for advice. My initial plan was to check and tune the cavities for good SWR at the TX and RX frequencies (2 cans each) Then to examine the insertion loss of each cavity individually. But I have no idea what to expect. What should be the expected insertion loss of a single cavity? What should be the expected loss be at the rejection dip tuned by the series cap in the loop? So far I am seeing only about -30dB at the dip. I have already discovered a bad cap in one of the cans. There may be other problems. So far, I cannot even be sure whether these are the "B" models for the ham band but am assuming so since the SK's repeater was VHF. The whole diplexer was thickly painted so that I cannot see any ID numbers on the loop boxes either inside or outside. Any and all advice will be gratefully accepted. 73, Jerry W6OJE

If you might have some of the KXN-1039 channel elements on GMRS repeater transmit (462 MHz) or repeater receiver (467 MHz) frequencies, please drop me a line. spencer12345@... Thanks!

Years (more like decades) ago, I was playing with MX300's for a portable repeater. Got rid of the radios and parts long ago, but just came across a box of Manuals, and an antenna test cable. Anyone interested in these before I recycle the paper? Probably $15 for the shipping. Chuck n0nhj Glenwood Springs, CO -- This email has been checked for viruses by AVG antivirus software. www.avg.com