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DMR IDs are only sent from/to whomever you contact. Most of the CPS requires an ID but the only purpose is to identify units on the same network.

The timing of this is perfect for me: I was listening in on a repeater and someone, that owns a different repeater, was driving through KY, (on a Ky repeater) trashing Ky. They are on a repeater in Ky, their repeater is in Ky, they live in Indiana and trash talk Ky. It was not the first time. So, I, politely, set the record straight; not on their repeater. They lost that zone, came back on their repeater and started trash talking me, personally, (because he assumed if he was out of range of the other repeater I would be out of range of his?) I told him I could hear him and he was just lying about what I had said. So, he threatened to ban me from his repeater and get every repeater around me to also ban me and I laughed. I sent out 'requests' in April, he replied with 'enjoy' to the official request and sent message saying he banned me, yesterday morning and saying he would talk to the other owners in the area... Threating me, again. Well. This is not about rude behavior, this is someone thinking they can group the repeater channels in the area and make them high school cliques. There are 8 channels for repeaters. The section cited is who is allowed 'control' over the equipment. Not the use of. It's America guys; you can broadcast on any frequency with any tone you are licensed to and if their, expensive, equipment cannot discriminate, I have no responsibility to spend a calorie changing the programming on my radio. I should post screenshots and email chains but let's see if they want to have their $0.02 here.

Yeah, I have to agree: seems to turn DMR into GMRS and not in the broader spirit of Ham Radio. But to each, their own...

ISM radios, such as the Motorola DLR200 DLR600 and DTR700 radios, for communicating with other radios you will need to know the Group Profile ID Number and have your radio programmed accordingly. For Direct Connect, you would need to know the 11-digit Private ID numbers of the radios you want to communicate directly with and have that info programmed in your radio. The radios do come with a factory default program and will communicate with other factory default programmed radios, but good luck and finding anyone with a factory default program when the SHTF that is nearby within no more than a mile. These radios cost almost $500.

I wonder how they link them. They won't tell me

I see this question so often that this almost needs to be a direct post about it so it can be referenced. I came up from CB radio many years ago where guys would think that if they had a 1:1 match that they had somehow accomplished something almost magical and akin to hitting the lottery. Or they would brag about how they had a 1 to 1 match and how great their radio system worked and nothing could come close to it's performance. The truth is far less dramatic than that. And when you really start to understand signal levels, delta of signal levels, meaning how much difference in signal level A from signal level B actually is and what the perceived and actual effects of that level difference is, you quickly find out that it ain't much. Now you meter actually SHOWS the percentage of signal forward VS reflected which is SWR. SWR is the RATIO of forward vs reflected power. Of course reflected power is power that is NOT being radiated by the antenna. Some same it backs up to the radio and is burnt off as heat, others will tell you it reflects from the radio back to the antenna and is then radiated (which is BS and due to phase changes would really DECREASE your signal) and there are a few other stories out there of what becomes of the reflected power.. but the crux of it is, it's not going out the antenna as signal. So then we get into the discussion of decibel or dB. And here's where the rubber really hits the road. Because while the radio is rated in WATTS for transmit, the receiver is rated in dBm for receive. And the whole idea of GMRS radio is talking to others. The other guys receiver is what you are trying to effect a response from. And NO amount of power matters if there is no one listening on the other end. That is referred to HAM radio at this point... no one listening. So a cool little tidbit of radio is that wattage can also be expressed as dBm. Now, some might know something of decibels from school and that it's a logarithmic number that is a delta or difference from some other value. That's where the little 'm' comes in on dBm. The 'm' in this case is 1 milliwatt and it equals 0 dBm. so the 'm' sets the reference point of the delta. Positive numbers are values above 1 milliwatt and negative numbers are values BELOW 1 milliwatt. So then we can start looking at something recogniziable. 0dBm = 1 milliwatt 0.001 watt 30dBm = 1 watt 33dBm = 2 watts 36dBm = 4 watts 39dBm = 8 watts 42dBm = 16 watts 50dBm=100 watts 60dBm = 1000 watts Couple things to see here. A change of 3dB is double / half the original power. 10dB adds or removes a zero from the value and 30dB of change is 1000 times or 3 zeros So for every 10 dB of change, you add or subtract a zero or move the decimal place up or down. Now we have that established. We can get into receivers and receiver sensitivity. Most GMRS radios are going to hear down to -115 to -120dBm range. Now that's pretty wide, but that range covers from the crappiest radio to the best UHF receivers you will find. Then we get to the 12dB Sinad which is a 12dB signal to noise ratio receiver test. This is the intelligible signal (receive audio) being 12dB above the background noise in the sound coming out the speaker. Still has some noise but is fully understandable. This falls around -108 to -105. Then there is full quieting at -100 to -90. That is a dead silent signal where only the intelligence (spoken word) is heard in the receiver. These are in 10dB hops. Remember the 10 dB rule right. It's a signal level change factor of 10, one decimal place. Obviously smaller changes can be measured with test equipment. But your NOT going to HEAR a difference in the speaker with less change than the 10 dB hop. So NOW we get to SWR. And we start looking at signal change based on SWR or 1.5 , 1.75, 2, and 3. Anything over 3 is bad. And it's not really effecting the signal levels mean as much as it's creating a problem for the radio that's transmitting. All numbers are based on 100 watts transmit power. 1.50 : 1 SWR is 4 watts reflect and 96 watts radiated or a 0.1773dB difference from a 1 : 1 match 1.75 : 1 SWR is 6.7 watts reflect and 93 watts radiated or a 0.3152dB difference from a 1 : 1 match 2.00 : 1 SWR is 11 watts reflect and 89 watts radiated or a 0.5061dB difference from a 1 : 1 match 3.00 : 1 SWR is 25 watts reflect and 75 watts radiated or a 1.25dB difference from a 1 : 1 match SO... it takes a signal change of 10dB to HEAR it, and these changes are less than 1dB change until you get out in dangerous territory. So from a perfect match to a 2 : 1 match makes basically NO difference in the signal the other guy hears. These are the numbers. All this is on the web, and yes I use a calculator for it because math SUCKS. But it doesn't lie. But this is how I can sit down and figure out if you give me distance, antenna gain at both ends, cable loss at both ends and receive signal strength, I can tell you how much power you are running. There are some other things not mentioned like path loss that are taken into account (that's the distance portion) but it's all numbers once you have a good understanding of it.

There is a designated Aeronautical channel for private fixed wing aircraft for air-to-air communications. That channel is 122.750 MHz. Private Rotary Wing (Helicopters) have their own air-to-air communications channel.

Yea,, when you are interested in only those in your group.. Who cares about those 'other' guys?

As I mentioned it doesn't have to be unique. Using some made-up ID works, which defeats the purpose of having a DMR database in the radio. I've done the later accidentally, used the wrong ID when programming my radios. That happened when a guy on an out of area repeater noticed my call sign didn't match the call sign that showed up on their radio. Oops.

TIDRadio doesn't seem to publish release notes for their firmware - I think they just announce it on their FB page and hope you find it. Kind of frustrating. IIRC the latest firmware just fixes some issues with the airband frequencies so unless you really like listening to local airport traffic, it's not necessary (and it's not super exciting anyway).

for the most part, i have learned to ignore my assigned DMR ID and rely on my unique ID i made up.. As long as it gets programed in all the radios in your group, good to go and harms no one.

Sorry to burst your bubble, but there is a whole lot more to DMR than H.A.M.S radios networks.

No.. Too much risk, not enough reward.

Hi everyone, New here and new to GMRS and radios all together. I recently purchased two TD-H3 radios to use at my son's training and events. Special Olympics Track and Field basically for us to talk between me and the other coaches. The radios came with firmware version 240817. I have downloaded the firmware but I don't see anywhere in the zip file about what the new versions offer. Like specific improvements, bug fixes, or new features which I am used to reading that before updating the firmware. So does anybody know what changes and is there a reason to update at this time? I am still reading learning the terms and etiquette for radio use. Many thanks for any information and for your time. Rick

Yes I know. That's one reason I got it because I can use it on the Ham band. The other is to see if I can get it to communicate with a couple of Icom dPMR radios. Doing the experimentation on 70cm is legal so long as i properly ID. There are a few differences between dPMR446 and the full featured dPMR. 1. dPMR446 uses the concept of a "common ID", whereas dPMR uses a "dialing" address, 24 bits, that functions as a Talkgroup and user ID depending on the range set for the ID. The remainder of the range is interpreted as the Talkgroup. You want a larger range for ID's, you have less range for Talkgroups. 2. The CC, channel code, for dPMR446 is a fixed value depending on the channel frequency. There are only 16 unique codes, listed in a table in the dPMR446 standard document, that would be used. For dPMR the CC is calculated based on an algorithm that uses the frequency, and there could be up to 64 unique codes. Using that algorithm for dPMR with the dPMR446 frequencies you don't get the values listed in the table for the dPMR446 standard. Otherwise the two are the same protocol. Number 1 I did some calculations and can generate the required bit pattern for the "common ID" using the dPMR Talkgroup/ID. However I can only generate a valid Talkgroup/ID for about 222 out of the 255 "common ID codes" Number 2 I think is going to screw things up where the communications will fail. I suspect this was done to prevent someone, like me, from attempting to use a commercial grade dPMR radio on dPMR446. I guess that's why there are two standards. Mathcad - dPMR446 Common ID Cod.pdf Channel Codes Edited ETSI TS 102 658 V2.6.1 (2019-01).pdf

DPMR 446 operates in the 70cm amateur band in the USA. An amateur radio license is required to operate there. Sent from my SM-S911U1 using Tapatalk

ISM radios are limited by power and antenna type. You'll have about 3/4 of a mile coverage. Sent from my SM-S911U1 using Tapatalk

Leave it as is. You'll be fine. Sent from my SM-S911U1 using Tapatalk

You require a DMR ID to access amateur radio networks. Sent from my SM-S911U1 using Tapatalk

Just an FYI, Baofeng has notified me that the mic extension cable is available. Soyou can mount the radio anywhere in your vehicleand just run the Mic cord to it. Link below. https://baofengtech.com/product/btech-5m-control-head-hand-mic-extension-cable-for-gmrs-50pro-male-to-female-shielded-16-4-ft/

well, my first guess, most vhf aircraft communictions, espeicaly commercial, is heavily monitored and recorded... My choice to have a somewhat private conversation with someone would be the lesser of the two..

That's OK. One other point to make. You don't really need a unique DMR ID to use DMR. FCC doesn't require it, and it's not a substitute for ID'ing using your call sign. So if you're not in the official database all anyone sees is garbage. Not to mention spoofing DMR ID's. Yeah people do that and since it's not illegal the FCC couldn't care less. For those than want to register and get a DMR ID this is the place. https://radioid.net/ I also have a NXDN ID too BTW through this site. I also believe people use their DMR ID as the digital ID for P25.

When all else fails, I generally "sniff" out the access tone, and go on the repeater and ask for permission.

You operate completely differently than I do but generally I don’t dismiss features that I don’t use that are important to others Put another way, I point out the limited Digital ID memory of the DM-32 for those whom the feature is important.