SteveShannon

I didn’t read the technical bulletin. Does it sound like it could be related?

Look at this that I found on ehams: https://www.eham.net/reviews/view-product?id=3650 In 2007 our repeater site was apparently struck by lightning, resulting in damage to our VXR-7000 repeater unit. It was returned to Yaesu for repair. Upon the repeater’s return we became aware that the unit was not as sensitive as it had once been. Initially we put this down to band conditions and bided our time. When things did not improve, we began testing our whole repeater installation. We had our duplexer professionally checked out by a fellow ham with access to professional test equipment. The duplexer is totally up to spec. We had the repeater checked by similar test equipment and it was found to be in order. Yet we found the following to be the case: • reception from our fringe areas of the repeater coverage was poor at best, with stations that once easily held the repeater no long able to do so. • a low-volume hum appeared on the background of the repeater output. The hum was not present on the input signals to the repeater. • there was a click generated at the end of each relayed transmission. This was not previously present. As the equipment seemed to test out we reasoned that the problem must be in our cable interface. Accordingly we replaced our repeater/duplexer cables with new RG214 cables with N connectors. These were fabricated by The Wireman in South Carolina. These new cables replaced our original RG8 cables which have PL 259 connectors on one end. We used N adapters to connect to the VRX 7000. We again contacted the Yaesu Service Department and were advised that “In December 2007 we identified a problem in the TX Unit that caused oscillations and feedback when certain duplexers were connected to the repeater. This would cause a 'desense' like problem in the repeater. This occurred within certain serial numbers or when an older unit had the PA Unit replaced with the new PA Unit (as yours was).” “I have attached the technical bulletin describing the fix. We would of course be happy to install this for you here but considering the shipping costs, you may want to apply the fix locally. It is a single component change (adding a capacitor). Please take a look at the Technical Bulletin and let me know what you decide.” After reading the bulletin we had Yaesu send us the capacitor required. We installed it and our repeater is now working flawlessly. The fringe area coverage is, if anything, superior to its previous good state. Should this seem to be your situation, we suggest you contact Yaesu and request Service Bulletin TB0711-1A. If this does not work out for you, please email either Jerry (VE5DC) at jkdixon@imagewireless.ca or Slater (VE5OA) at s.tubman@sasktel.net

I apologize. I was just wondering if some audio (I guess it could be RF also) is somehow being routed back from the transmitter to the receiver side of the repeater, where it would be picked up and sent to the transmitter as feedback. I know nothing about that specific repeater so my speculation is probably BS anyway.

I didn’t mean it as a correction. The amp is frequently sold as a package with a UT72 but I don’t know if it’s the GMRS tuned version.

I wonder if the connections within the repeater have sidetone from the transmitter side going back into the repeater.

There is also a UT72G that’s tuned for GMRS.

root@alarmpiNBothell ~]# Sudo asterisk -rx "opt fun 25312*3177" Response: Usage: apt fun <nodename> <command> Send a DTMF function to a nod root@alarmpiNBothell ~]# One is “opt fun” and the other is “apt fun”. I suspect they both should be one or the other and a typo happened. opt is an optimizer and apt is advanced package tool. I suspect “apt” is the correct spelling

Does it sound like feedback?

The guy is a recent licensee so the historical background is not relevant. The guy should pay attention to what Rich suggested and review what he entered. If he entered the same thing he used in his Guest name it’s a mistake. Sometimes the difference between a lowercase L and the first ordinal number isn’t always obvious (especially for us old farts that learned on manual typewriters where a single character represented both).

What do you mean by "I get more power?" How are you measuring the "power" you're getting? Or do you simply mean that others receive you better? Clearer? Louder? Or are you actually measuring the power output where it feeds into the antenna? So: GMRS Radio -> U25 -> UT-72 gives you less power than GMRS Radio -> UT-72? Or GMRS Radio -> U25 -> UT-72 gives you less power than GMRS Radio -> Unknown stubby antenna Have you tried using GMRS Radio -> U25 -> Unknown stubby antenna? How does that compare? What's the SWR of the UT-72 at the frequency you're transmitting? What does the amp's SWR look like to the radio? If you're truly measuring power (watts) using the U25 and UT-72 combination, and it's less than measured power going into the stubby antenna, where are you measuring? Assuming they're both the same measurement point (right at the antenna) then it could be bad feedline, bad amp, or bad antenna: high SWR on antenna (reflected power subtracts from forward power).

Right next to their profile picture is a link to Message them. I'll send you a message saying the same thing. Steve

Check and remake all of your connections. If that still doesn’t help (it’s just a last gasp effort) then I would call customer support. It could be any number of things from a cold solder joint to a cracked trace on a PCB or something completely different. I’m sorry, but I don’t have any more suggestions. Please let us know what they say.

Measuring at the radio, does the voltage stay at 14.1 when you key up on high power? I think your next step would be to call customer support.

Zip files can also be broken up into manageable sized files that can be reassembled: https://kb.corel.com/en/125884?_gl=1*195znwd*_ga*MjAzNTA3MzA3NS4xNjcxNDU4NTY4*_ga_73J027E48R*MTY3MTQ1ODU2Ny4xLjEuMTY3MTQ1ODgyMC4wLjAuMA..

The two things I would check for are High SWR or Insufficient power supply. Some radios have protection built in that will temporarily shut down rather than transmitting into a high SWR. But it may simply be that your power supply simply cannot provide the power your radio needs when it’s transmitting at high power, resulting in the voltage sagging and the radio resetting itself.

Perhaps the terms of a grandfathered license allow multiple people to operate under a business’s license, but that’s no longer possible for new licenses. Nor is there an exception for community emergency volunteer groups. Unless it’s covered as part of a grandfathered license it’s just not allowed.

And possibly useful if anyone everwishes to put two of these radios together for full duplex communications, either repeater or fixed station, or possibly for ISS communications.

I think, based on his putting the word “up” in all caps, that he Michael was emphasizing the direction of the split, more than that the shift would be exactly 5 MHz. That’s important because repeaters on some ham bands can be offset in either direction.

Based on the markings on the PCB in the microphone housing it would appear that the hardware Anytone is the OEM.

If you want to try and figure it out, here are pictures of the circuitry inside the microphone.

No, he said he couldn’t tell the difference between the Wouxun XS20G or 935G SOC radios and superheterodyne radios, but he could tell a big difference between the Wouxun SOC radios and cheaper SOC radios. Therefore he would also be able to tell a big difference between superheterodyne radios and the cheaper SOC radios.

The requirement for repeater identification is one that many people have argued about quite passionately, even here on MyGMRS, but the requirement is clearly written. It’s just as KAF6045 says, a GMRS repeater must be identified and the only exception is when the only people using the repeater are family members authorized to identify themselves using the call sign of the repeater’s owner (and who do so). It’s every person’s personal decision whether they comply or not.

So far I’ve only read the article “Duplexers and Repeaters” but it was a good article, written at a level that anyone hoping to establish a repeater should be able to understand.

It’s usually only the last foot or two that are ruined on the cable. You really can just re-terminate the cable. Another thing that helps is to liberally apply Vaseline onto the PL-259 and SO-239 before connecting them together. Still use the self vulcanizing tape.

I have both DMR and Yaesu C4FM radios. DMR is harder to learn at first and harder to configure from the front panel because of the codeplug. Yaesu is easier to just pick up and talk, if there’s already a repeater. But if you want to establish your own node to the YSF network, it gets pretty complicated. I’m envious of the fact that you have some active C4FM repeaters in your area. There’s only DMR here, but it works well. I haven’t used D-STAR yet.