u/ElGuano

I have a mobile GMRS radio, and every so often, usually early in the morning, I'll turn it on and it'll act like it's in monitor mode - every channel will break squelch even if there's nothing transmitting, and the RX meter will show 2/9 on most channels. From what I can see, it otherwise receives signals just fine.

I can up the squelch and that helps, but I find it's very sensitive and that starts to cut out actual transmissions as well as repeater squelch tails.

Another thing - when this happens, usually a few hours later by late morning it clears up and the radio behaves normally.

I'm most worried about whether there is moisture in the NMO housing or getting into the RG58 cable causing a short of some kind. But I don't know how a shorted antenna behaves, what should I expect in that situation?

Is there anything else I can try?

Looked over the manual but still confused about a few things:

1. What do all the icons in the top row of the display mean? Does anyone have a clear legend of what these mean?

2. How does "Scan" work? I can start the scan and it cycles through all the channels/freqs in the current group, but it just keeps going to the next channel even if there is active traffic on the current one being scanned. And also I can't find a way to stop the scan at a channel I hear comms on, when I turn off the scan it just goes back to the channel I was originally on.

I have an NUC in my network rack running Home Assistant, it's connected to my UDM-SE with a direct 1m patch cable. Looking at my network, this is the one device with significant packet loss, roughly 6k rx retries and rx drops every hour.

I tried using a different patch cable, with no change. Next, I plugged the NUC into a free port on my Pro Max 16, which is in the same rack, and now I'm seeing zero retries/drops. Great news, right? Sure, but I'd also like a better sense of what the root cause is. Is there something going on with my UDM-SE? Any suggestions on how to further troubleshoot?

Btw, despite the retries, I never see any major problems or lags/timeouts, and it's not noticeably faster now that it's on the PM16. It usually transfers a consistent 3-10Mbps across the network so it's not particularly high-bandwidth.

https://preview.redd.it/pgb3olgha0yg1.png?width=1057&format=png&auto=webp&s=f03afd753b4f450f98736efa7ec08645c839257a

Hoping someone can help with a few questions I have:

1. Can it transmit on 462-467Mhz?

2. If you get the optional BT mic, do you EVER need the wired speaker/mic connected? If I install the headunit behind a panel, I'm trying to understand if I will ever need to dig it out.

3. Does the main unit power down when the BT mic disconnects? I'm looking for a mobile install, connected directly to car battery terminals, and I want to know how convenient it is to turn the headunit off with the BT mic (do you just power down the mic and that also puts the headunit into standby mode?)

4. Do you have to pair the BT mic every time you turn it on, or is it just the first time? And it automatically

5. There's a speaker in the headunit as well as the handheld speaker/mic, correct?