Radioguy7268

My understanding of the newest wiz-bang AT&T provided FirstNet LTE is that there's simply NO provision for radio to radio simplex in the Voice over LTE protocol. All conversations must go through the network backbone. I believe their concept is that since they're building a "hardened" backbone, it's not supposed to go down. There are other Public Safety systems that want to force every conversation through a repeater because it makes central control and recording of all calls possible. It also means that a "lost" radio can't be used if it's killed/stunned on the network. If you allow the radios to run simplex, who knows where it might migrate to? Not how I would run a multi-million dollar public safety system, but then again, nobody is tossing me the keys and asking me to run one.

Look in the "Radio Wide Configuration" - Make sure that the CWID option is enabled in the General Option tab, then switch over to the: CWID Signaling tab Once you're in the CWID tab - make sure that CWID Operation is set to "Only with repeater activity" - then set your time interval (10 or 15 minutes) - and I'd recommend using PL strip along with the "Interruptible by PTT" setting. Good luck with it. R1225's are famous for burning up the PA if they're run on full/high power settings - even when you don't think you're close to the advertised 50% duty cycle. I'd recommend making sure that the fins and fan are clean & setting the unit to low power with 25 watts or less out of the repeater. Use an external amplifier if you really think that you NEED 50 watts out of the transmitter (you probably don't.)

I would agree. Allowing any type of automated GPS updates will kill channel capacity even if you've got just 5 or 10 high power units reporting GPS location every 30 seconds. I haven't looked deeply enough at the rules - but is the FCC requiring units to monitor the channel prior to transmitting their "brief" data burst? Automated location updates on repeater channels would be a disaster. I can see a point to allowing units to update automatically once every 10 to 15 minutes - or alternatively, tagging on to the beginning or end of a voice transmission like a PTT ID.

I do most of my CDM programming nowadays with a cheap USB cable. I've got the RIB box, but it's really only necessary when you're trying to do a Flash update for firmware. There are plenty of other "gotcha's" involved with programming though - and I'll agree that a real RIB with a genuine Serial port is your safest starting point. The audio quality on the CDM's is good - but I like them much more for wideband than narrow. The 12.5 narrowband always seemed to be lacking for volume - even if you jacked around with the gain control, audio compression and compandering. The newer XPR units seem to have better 12.5 analog audio - right out of the box.

A CDM radio is not Part 95 Type Certified. The CDM radios (and the matching HT portable series) are Part 90 Commercial. I'm of the mindset that Part 90 meets and exceeds all standards for Part 95, and it appears that the FCC agrees: https://transition.fcc.gov/oet/ea/presentations/files/nov17/54-Part-95-Misc-Eqpt-Filing-r1-TH.pdf So if you don't want to use Part 90 equipment, that's up to you. You're never going to find an example of the FCC fining someone for using Part 90 equipment, and you've got their own words above that basically say that their intent is NOT to prohibit users from operating with Part 90 equipment on GMRS. I'd use a CDM radio for a base - but like Steve says above, you want to get the "mid power" version if you want to operate at lower power levels. There's a ton of information on the CDM series over at repeater-builder.com . Beware of Ebay refugees if you're looking at CDM radios. There's a bunch of hacks that people used to take the LS trunking models and flash them into Conventional configurations. Done right, there's nothing wrong with using one of those - but done wrong, you're just buying a headache.

Except the person you're talking to on 462.xxx simplex is still going to hear you if you're using a repeater to talk to someone else when transmitting on the high side of 467.xxx (PL mask or not, you're still on that repeater's output frequency.) There's no "extra" channel capacity - unless you're on the very fringe of a repeater's coverage area, and counting on the FM Capture effect of your stronger local Simplex signal over-riding the weaker signal of the distant repeater. Even then, any other user in your local area is going to be either listening to you, or waiting for you to be done before they can effectively use the channel for their conversation. You might segment people into talkgroups via PL based fleets or subfleets, but you don't gain any channel capacity. In short, I agree with the 22 channel comment.

Turn the radio over (smirk). But seriously, yes. That's what you do - but then you unscrew the front control head - turn the display right side up, and screw it back on. It was designed to do that. Alternatively, you can hook up an external speaker & put that anywhere that's convenient.

Yeah, the big advantage is having one radio that acts like 2 (portable on the belt, mobile once you're clicked into the MVA dock). When the radios are "subscriber" based, meaning that there's a fee associated with having an ID on the system - or if certain radios get enabled with certain features/talkgroups - that's when it's a lot easier to just have Trooper A plug his portable into Vehicle X when he's driving that. Or do the same when he switches over to Vehicle Z. That way, no matter what he's driving - when he keys up, he's still showing as Trooper A on everyone else's radio.

I don't have any personal experience with using one. I've seen a few. Pricing for new runs north of $1000 - and you still need to get it installed. What are you looking to do with one? For GMRS use - I'd tell you that you can buy a decent 40 watt mobile for a bunch less than buying a new MVA docking station. They also take up more dash/console space than a remote mount mobile.

Pretty sure that enabling VFO mode disables the FCC Part 95 cert. Unless they got one of the overseas labs to "certify" it with that feature enabled. Wouldn't be the first wonky Type Cert that I've seen. Same as enabling Wideband with a firmware patch on a radio that only got Type Accepted/Certified for Narrowband. What a can of worms, eh?

If your primary transmit function is GMRS - then skip the dual band stuff and go for straight up UHF GMRS that's focused on 450-470 MHz. Dual band stuff is tuned for 2M VHF (@ 145 MHz) and UHF amateur (@ 440 MHz). Your 467.xxx GMRS transmit isn't going to like a dual band antenna when you go to measure VSWR. You will still receive local VHF/UHF signals if you want to scan other stuff for receive on your GMRS antenna. If I was trying to transmit out of a canyon, I'd use a Yagi every day of the week for hitting a distant repeater from a tough spot. Even if your favorite Ham tells you to get a dual bander. Especially if you want it to work.

If you want to be heard clearly - get an actual 50 watt radio that can do wideband with 5 kHz deviation. You'll transmit 50 watts on frequency, instead of amplifying spurious noise all over the band while still deviating less than you need. You will probably find that with a good radio on a Yagi you can actually turn the power down to 20 or 25 watts once you've got things set up.

Heddy envisioned using a player piano roll with pre-programmed punchouts that would determine the cycle of hops. A pseudo random code at best. Heddy assumed that any interference on a given frequency would be overcome by hopping to the next channel. She wasn't trying to avoid creating interference, she was trying to deal with interference by getting the most information through, and providing a moving frequency target for the enemy jammers. Transmitting your ID on the last channel transmitted on does not meet the FCC rules as I read them. You would need to transmit ID on each and every channel you transmitted on during the prior 15 minutes. Without hopping during said ID.

Just because the FCC rules do not specifically prohibit an intended use, does not mean that the rules allow that use. Please tell me how you expect to monitor the frequency to determine if it is clear to transmit on - before your radio automatically "hops" to the next channel? Do you just assume that the entire GMRS band is clear and available for your sole use in the area of your operation? Or does the radio go ahead and transmit over top of any current users, with the idea that since you'll be hopping to another channel in just a moment, the brief interference is annoying but acceptable? If your fancy frequency hopping radio actually does monitor prior to transmit - how does the radio you're talking to know what frequency it should be moving to in the event that the intended channel it was supposed to hop to is now occupied? Also, once you're done your conversation, are you going to manually go back and clearly identify by callsign on each one of the channels which your radio just transmitted on? Or, does your fancy Wouxun/Radioditty/Pofung take care of identifying for you? If you can't answer those questions, I don't see how you could say that the FCC allows that use. The radio may carry a "Type 95 Certification" label, but that doesn't mean that the FCC actually tested the feature in question and approved it for GMRS use.

Yes, that's a weak point on some used/older XPR6550 radios. That, along with a PTT side button that becomes kind of picky about exactly where you squeeze to transmit. The fix for the side button is to replace the entire housing (Motorola doesn't sell the microswitch & flex assembly separately to my knowledge) - or to just use a Remote Speaker Mic to supply PTT. The volume pot is a difficult repair for a hobbyist, but if you've got skills, it can be done. Before I'd pay someone else to do it, I'd probably look for another radio. That volume pot problem is rare enough that you don't always see it on older units, and even a "soft" pot still has some life left in it if you're not turning it on/off up/down 10 times a day.

Just to keep things More Moto-confusing, there's another software pkg out there called "Tuner". You better know what you're doing before you mess around with Tuner blindly & just "try some stuff" to see what it does. Save your Tuner files before you do ANYTHING you might regret. You also need to match up the firmware package on the radio with the version of Tuner you plan to use. Newer versions of Tuner pretty much assume that you've got the radio hooked up to a high end Aeroflex service monitor to do "Autotune" which is a nice feature if you're going through 100 or 1000 radios, but not so great for the hobby user. Anyway - the Tuner software is where you can actually adjust the squelch settings. From the factory, the standard Normal squelch is fairly close to threshold, and Tight usually brings it up 3-5 dB.

Search up some stuff on the RS-232 data standard, and I think it will help you. CD = Carrier Detect RTS = Request to Send CTS = Clear to Send DTR = Data Terminal Ready? DSR = Data Set Ready? Ring = ??? Detect ringing voltage on the line? It's been too many years since I messed around with doing Modem stuff over radio channels. At one time it seemed like the future for SCADA control. That was a LONGGGG time ago.

The Impres battery system is one of the few Motorola things that impresses the heck out of me. I'm surprised that other manufacturers haven't followed Motorola's lead on this. I can vouch for the increase in battery life & efficiency. I've had some customers getting 4 and 5 years out of daily use Impres batteries before they drop below 80% capacity. Prior to Impres, those batteries would have been tossed after 2-3 years. Nearly doubling the lifespan makes a pretty good case for why you should pay twice as much for Impres. Newer 2nd generation XPR radios (not the XPR6550) and systems allow you to report and track battery status "over the air" as the units transmit.

It's a different board build. Not as simple as just ordering up the correct SMA jack & screwing it in. I'd guess that ordering in the Call Box configuration option basically gives you the same board - just flashed for North American XPR7550e firmware.

And yet the same XPR7550e radio sold over in the EU as a DP4801 can be ordered up with an SMA connector (as a regular radio option, no call box option needed). I think it's all marketing. Nothing to do with the engineers. Same reason why Motorola won't give their APX series radios DMR capability.

FCC field agents carrying DNA kits. That's something I haven't seen.

Unless I've really missed something in the rules, there's no titling or registration involved with GMRS equipment, so "proof of ownership" isn't going to get you far as proving what equipment belongs to whom. Everyone in my extended family is using "my" equipment, even though I gave it to them, and some of them live a few states away.

Yesterday, while transmitting to my wife, a neighbor's kid heard us talking, and said "What is THAT!?" while I was still keyed up. My wife heard the kid, and answered young neighbor kid, so obviously his question went out over the air. Which one of us broke a law? Asking for a neighbor...

Oh, and Radio Management & templates is probably not something you want to mess with for basic codeplug builds on one or two radios. As you surmised, it's more of a fleet management tool. It is good if you want to push out OTAP codeplug updates to 100+ radios, without having to lug around a laptop and cables to touch each radio.

There are Motorola training videos if you have an MOL subscription *oops, MOL is going away, replaced by PartnerHub and the Learning Management Platform. I will tell you that the Motorola training videos don't really show you much of how to build a codeplug for any specific purpose. They're very general, and they'll give a few pointers, but most of what I've learned over 15+ years messing with DMR has been by poking around and experimenting. Analog is pretty simple and straightforward, but the Digital stuff can drive you nuts until you figure what ticking one checkbox does to 10 other parameters. There's a few videos on the Utube that will help you out for a few specifics like setting up IP Site Connect or building a Capacity Plus codeplug, and there are sample codeplugs out there for some of the more popular DMR Ham platforms that will get you 90% of the way to what you want without spending a bunch of nights typing in 1000 contacts and 15 zones. You can also give Wayne Holmes blog a look, he's probably the best free resource you'll find for Motorola. He's also got a few videos online that are better (In my opinion) than what Motorola puts out. https://cwh050.blogspot.com/