MarkInTampa

I just saw a YouTube video on new aftermarket firmware for the H3 a hour or two ago. One of the things claimed is that it is programmable/firmware updateable via the USB-Type C port. He shows a video on how to do just that. I have no idea if it works on the GMRS locked version or not. The 3rd party firmware actually looks half decent. https://www.youtube.com/watch?v=2QbwW1Sgy5o

I was testing for the OP on the lookup issue and didn't want to log out of mygmrs in Chrome (to be honest, I don't remember my password but have a good idea - someday I need to remember to dump my saved passwords from Chrome before it's too late). I use MS Edge maybe a few times a year, more for testing if a site has problems in Chrome than anything else. I typed "mygmrs.com" directly in the address bar - didn't search for it when the scam site came up. I exited Edge, tried in Chrome and it was fine, went back to Edge and it worked fine. Like I said, most likely a issue on my side. I'm just used to uBlock Origin in Chrome blocking such sites for years, killing the commercials on YouTube, etc. It's a shame Google killed it from the plugin store. It still works, but don't know how much longer.

I just tired checking my callsign on the callsign lookup tool from another browser without being logged (or ever have been) into the site and it works just fine. It showed my username under my callsign. BUT.... I only Microsoft Edge on rare occasion (what I used to test). I typed in mygrmrs.com in the address bar, it redirected me and brought up an obvious Windows security scam site. First one I've seen in years. I clip-boarded the redirected address and pasted it into Chrome, it blocked it as a malicious site. Tried mygmrs.com again in Edge and it worked fine. Probably a issue on my end but spooked me a bit.

Go the the main MYGMRS.COM webpage and lookup your callsign. If the callsign has a MYGMRS username associated with it (and it should if you are a registered member) it will be displayed right below the license expiration date.

Yes... At least on 467.550 and 467.575 (the input freqs of GMRS repeaters 462.550 and 462.575) per ITU agreement. The sad part is they are allowed and encouraged to run a shipboard repeater output on those two GMRS repeater inputs but at a 10MHz lower split instead of +5MHz GMRS uses.

One of my area ham radio clubs (they also run a great GMRS repeater) runs an event every month at a local park. Every month is a different theme, one month is QRP and the next may be GMRS but they always encourage GMRS users to come out and participate and always have a GMRS station setup. A few months ago they held a fox hunt theme with three stations. One GMRS, one 2m and one 70cm at different locations. I was out of town but heard they had a lot of fun.

The way I hear family ID's on GMRS goes something like this: First transmission: "(callsign) unit 1 to unit 2" Second transmission (responding radio) "unit 2 go ahead" Conversation between the to units but no ID since they know each other Last transmission "(callsign) clear" I don't think I've ever heard a family ID ever go on beyond 15 minutes.

Check out the Signal Identification Guide website at https://www.sigidwiki.com/wiki/Signal_Identification_Guide In particular the DMR, NXDN and the different P25 modes. Sound examples are on the webpage.

You should have tone on output of 467.700 not the input. The input tone of the repeater is the output tone of your radio.

The largest repeater in my area (462.575) has two receivers, primary on the standard +5 (467.575) and a secondary on 467.725. The repeater overlooks the port of Tampa and gets occasional interference on the primary input from ship traffic and they have shut it down. Unfortunately it confuses a lot of folks and a lot of radios (Midlands for example) don't support anything other than a +5MHz offset so they are unable to transmit to the repeater but receive it just fine. My Wouxun's (KG-1000 and KG-935) will allow for a different offset - as long as the TX offset is a GMRS frequency (including frequencies not assigned for repeater inputs like 467.6125) but a lot of radios don't. If your radios have dual scan or priority watch, what you can try (as long as the TX frequency is a standard GMRS frequency) is setup TX on whatever you want and RX as a 2nd channel on the dual scan or your priority watch channel.

Keep in mind that maritime users ARE allowed (even digital!) on the GMRS repeater input frequencies of 467.550 and 467.575 per ITU (not FCC) regulations but not the outputs of 462.550 and 462.575. They may affect (as they do in my area) the input of a 550 or 575 repeater mixing in with legit traffic even if on a different tone causing a bit of chaos on the output.

Like I said, your results may vary. The SWR on mine (again 2m/70cm version) is less than desirable on GMRS. However the GP-6NC GMRS version has as close to perfect SWR on GMRS (what it was designed for) as you can get and has a decent SWR across 70cm and 2m as well.

The GP-9 2m/70cm antenna sucks at GMRS, at least in my case. If you have a SWR meter or VNA test it out yourself, your results may vary....

You are about dead on on power loss. 59% according the the calculator, but with the gain of the antenna you have an effective radiated power of almost 200 watts. Keep in mind the tool I used (https://kv5r.com/ham-radio/coax-loss-calculator/) uses dBd for antenna gain, dBd = dBi - 2.15

I put a loop at the antenna because the Comet instructions tell you to do so. I figured if it is in the instructions, there is a reason why.