Leaderboard

We are using Asterisk as the server (running on a raspberry pi 3) and the RTCM made by micro-node. Cheaper hardware solutions vs the RTCM are available but require other configuration. I have not used any of the other hardware so I wont touch on that. I chose the RTCM for its single unit design and application specific properties. The interfacing with the RTCM is rather simple, I went with the MTR2000 repeater for reliability, full duty cycle and used market availability. Our group hosts its own local node server (Asterisk running on a raspberry pi 3) with 6 repeaters connected to it. This local node also allows us access to the MyGMRS national linking network hosted by the owner of this site. By entering commands in Asterisk or using DTMF, links to other systems can be connected or disconnected on the fly. Things like usage counters and the visual map show links with red lines as well as what site is transmitting by changing its marker from green to red, all of this in real time. Its not as hard as it sounds, Rich from MyGMRS was a huge help, you can also find a linking thread in the private section here. Along the way I found a company that was able to build a custom cable for interfacing the MTR2000 with the RTCM, it provides a reliable solution that's repeatable and works flawless. The MTR2000 repeater can be configured to work with the RTCM rather simply using the repeaters wire-line card to handle the audio and the 96 pin J5 connector to pull ctcss, core, ptt and power. We are using the RTCM and MTR at 6 sites with a stand alone MTR at a 7th and could not be happier. These machines are worth every penny, its not 2 mobiles in a box its a true full duty cycle, commercial grade repeater. Due to the simplicity I have several more RTCM / MRT2000 combos ready to go I just need to fined a few more tower sites with internet. Hope this answers a few questions.

What does “duty cycle” mean? I bring up duty cycle every time I hear somebody talking about making a repeater out of cheap Chinese mobiles and worse any type of handhelds. Duty cycle is the maximum time an amplifier may transmit within a five minute interval, expressed as a percentage, to avoid overheating. Suppose a mobile amplifier is rated at 30% duty cycle. This means that it may transmit for no longer than 1.5 minutes and must remain off for not less than 3.5 minutes. Some people forget that a repeater is transmitting for 2 or more people, duty cycle will be reached quickly if you get into conversation. More people in the conversation just amplifies the issue. Once a radio reaches it's thermal design limits it will no longer be able to adequately cool the output transistors. Even if a radio is not hot to the touch the transistors are, in part because of the inefficient transfer of heat to the units housing or internal heat sink. The longer you exceed the duty cycle the more heat builds on the transistors, surrounding electronics and heat sink effecting it's ability to remain on frequency without spurious emissions. Exceed duty cycle long enough and you will need a new transmitter or radio. I have tested a few Baofang and TYT radios on my service monitor without great results. All of the radios started deviating outside of the allotted channel bandwidth after simulated conversation at 50% duty cycle, the longer I allowed this the worse if got. Testing was done using an Aeroflex 2975 IFR recently back from the calibration lab. GMRS is a tiny sliver of spectrum surrounded by the commercial land mobile part 90 service. It is important that any repeaters that are built or re-purposed are held to the highest standards and operated as to not cause any interference inside or outside of our allocated spectrum. I wont get into the part 90/95 debate but i do stand firm that non certified import equipment has no place on GMRS.

Good question. If they buy the boards from over-seas, and buy the cases from over-seas, and buy the microphones from over-seas, but assemble it all here, then they have the right to say "Designed and Assembled in the USA", but there is a certain percentage of the product itself that must originate from the USA before it can legally say "Made in the USA". (I do not know what that percentage is.) Source: My ex-wife's family is in the industrial electrical manufacturing industry, but they use some Chinese sub-assemblies, which means that on certain models offered by their company, they cannot say "Made in..." or use the little Red White and Blue stickers from the US Chamber of Commerce. Other models, they can and do make the USA claim.

I wonder who gave them the "rights" to advertise it as a "Made in the USA" radio?? Seriously - just buy a used M1225 or TK-880 radio. Twice the performance at half the price.

Welcome to MyGMRS and congrats on getting your license. There are a few threads on this topic and many users tend to be annoyed by repetitive posts, so for future assistance please use the search bar at the top of the forum to ensure your question has not already been asked. To access a repeater you need to know the frequency and any tone codes the repeater uses. It is also good practice to make sure the repeater is open to public use. Some repeater owners set rules for their system, some charge as part of a club to offset the cost of maintaining a 200' high tower. The MyGMRS site has all this info nice and neatly filed away and running a simple search there should yield results. Due to forum rules, we are not allowed to post repeater frequencies or codes in public spaces. This prevents unlicensed operators from pinging a repeater. Simply look up your desired area or use the map and you can't go wrong. Then just follow your radio manufacturers manual for programming and you'll be on the air in no time.

We are already doing it http://link.mygmrs.com Corey

Note: More power out the antenna equals more drain on the battery. So, even though a radio like the GMRS-V1 might only output 3 watts, if that is all you need for your uses then it is fine. Bigger is not necessarily better. In particular, if you are using a local repeater, less power is often a plus.