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Wasn't really talking about testing, but real world conditions. The conditions between my house and repeater are sort of at the fringe even though it's only 1.9 miles as way of the crow. And while walking around my neighborhood I can usually reach the repeater and transmit audio through my 5 watt HT. There are times where I can hit the repeater and get nothing, just a blank receive from the repeater for the whole transmission and then the courtesy tone. I have a courtesy tone on my repeater so I know when I hit it with absolute certainty. But I've never heard what I would consider an oscillation. This theoretical oscillation would only happen as long as the HT is keyed up.

That’s just about ideal. So the charger is definitely putting out 12 volts once the battery is fully charged. That seems completely wrong to me. For the example I listed earlier, the Baofeng charger displayed a green light and was putting out 8.08 vDC. The Alinco charger is still charging and it shows 8.34. When it turns green I’ll measure it again.

That could be. When transmitting the battery will provide the necessary power but I would expect a slight voltage drop which might cause issues for the charger.

Right around 8v. The one I pulled out of the box was at 7.5v and is currently charging. Bumped up to 7.7v on the included charger. I'll test it again and post photos when it's done charging (maybe in the morning depending on when it's done).

Hmm. I'm not sure what you are describing is all that unusual. Every radio that is on the ragged edge of a repeater can cause that 'oscillation' condition if the duplexer is not tuned correctly. There really isn't anything you can do beyond a properly tuned duplexer. Now when I am testing, I do run repeaters with the receive input not connected to anything, a dummy load on the transmit side and no duplexer. I have never had a transmit signal from the repeater desense my test HT to the point where there was a failure to operate correctly. I'm not sure you can create that condition unless something is horribly wrong somewhere.

Which is why I suspect a firmware issue with the charger increasing. Once the light turns green the charger should only provide the voltage necessary to maintain the battery. It shouldn’t increase the voltage that high. What does the fully charged battery voltage show when it’s out of the charger?

Spanish for "bear"

Wonder if the Alinco warning is due to the sudden voltage dip/current draw on power up messing with the charger. Kenwood's TH-D75 manual recommends not TXing while the battery is charging because the sudden power draw causes issues: The H3 batteries charge over USB-C and I'm using an Anker charger that I've used on pretty much everything else. While the battery is charging, it only showed 7.5-8v across the terminals. Shot up to 12v as soon as the light turned green. I can try it with the little single port USB block they included with the radio if you want another data point. Lemme unpack this radio and let's see what happens (assuming the battery isn't fully charged from the factory).

That’s what I’m saying; I don’t think it’s the battery. I think your charger is pushing too high of voltage. Take the battery off the charger and then measure the voltage at the battery terminals.

My Alinco charger with battery shows 7.93 vDC. My Baofeng shows 8.08 vDC. None of my battery chargers put out anything close to 12-15 vDC to a 7.4 volt lithium battery.

It's a known issue that's resulted in some fried radios. Someone made a video about it a while back (I think someone shared it on here - maybe in GrouserPad's thread?) and Tidradio made a note in my warranty replacement emails to always disconnect the battery when charging. Don't know if newer batteries have addressed the issue. I actually haven't unpacked my latest warranty replacement - I should see if that battery has the same issue.

It appears that your battery is in the charger while you’re measuring the voltage at the terminals that connect to the radio. I could see a firmware error (maybe even intentional but not what I would expect) in the charger increasing the charging voltage to the wrong voltage. If so, that should be a fairly obvious error that TidRadio should remedy. If that is what’s happening it could definitely let the magic smoke out of radio circuits. That would match your picture. My Alinco radio has a warning about powering on the radio while the radio and battery is on the charger. I’ll plug it in and see what voltage appears on the battery terminals while charging outside of the battery.

OK, I'm thinking again....sorry LOL So you have a repeater and an HT that is near the receive limit of the repeater. Why doesn't it oscillate? You transmit with the HT, the repeater receives the signal activates the transmitter, desenses the receiver and the transmitter stops and then the HT signal is received again and it oscillates back and forth on this. Is there a delay or something designed in a repeater to prevent this? I also have observed that there is a point where you can activate the repeater and keep it up but you can't push your audio through it, not ever scratchy audio, it's basically blank. But get a bit closer and you get scratchy audio. I assume that's when you are able to overcome the desense of the system?

I've heard the issue is that it's dumping the battery voltage plus the charging voltage once it hits 100% instead of shutting off the charger.

I’ve never seen a battery that could be charged to twice its design voltage, but I admit I’m not an expert on all battery types.

Here's another vid showing a tune of a duplexer on a non vna.

I might as well throw this in here: remember that "don't leave your battery plugged into the radio when you charge it because it'll fry your radio" video that made the rounds a while back? Charged one of my batteries from 50% to 100% and stuck a multimeter on it when the light turned green. 12v - not quite the 15v other people got but still much higher than the 7.2v the batteries are supposed to be outputting.

@WSIA835 They did not charge money when they sent me warranty replacements. First warranty radio came from a warehouse up in NY or NJ, second radio came from Amazon (ha).

I won't wish that on anyone. Barf Wang radios need to stay in Pandaland.

I realize that the GMRS frequencies aren't worldwide. All I'm saying is giving these tools to whatever they call their rescue and recovery personnel to use is a bonus. Of course they would have to comply with government regulations. You almost are making it sound like if either one of us went to Iran we wouldn't find any Baofeng radios.

It stands for "Oh, Shit! Over!"

Hmmm... never heard of OSO....

GMRS freqs are not universal. GMRS freqs in one country could be used for another radio service in another country. For an example, allocated public safety freqs in the US are the same freqs used for business radio services in England. No country in there right mind will send anything that could benefit the political division or military operation of an adversary. Iran may be in the world of hurt for radio communication or they may think any civilian operation could be considered an opposition force, may take away those gifted radios. Humanitarian items of medical and food would be a more appropriate. Electronic devices would never be approved by this country, nor they should be approved. Anyways, regardless of the freqs that could be used for by citizens in Iran, do you really think they would really work? Not a chance in hell they would work with all the electronic jamming going on.

I just did the clearing thing and no change. Thank You for reporting it, again!