Over Under voltage test Kenwood TH-D75

This is just a test to show you what happens to your TH-D75 if you have an over or under voltage issue. Remember Kenwood recommends 2 amps at 13.8 volts for your radio

[@rainerwenning4283]

Thank you Don, really good to know, 73 DL3RBW

[@user-vt6pw2qq7h]

Thank you Don.

[@chrissmart9761]

Thanks Don.

[@Eric-W0EDG]

Interesting. Appears to be well engineered. I thought I heard the radio wouldn’t power on without a battery installed but it appears it can.

[@w6gps]

radio does work with out a battery on 12volts socket. It will receive only on USB power and not TX

[@Eric-W0EDG]

Thank you for clarifying.

[@markr.1984]

As an emergency backup sometimes run mine off of a small Duracell AGM 12 volt battery (9 amp hour), which is about the size of a motorcycle battery. It's not 13.8 volts of course, only 12 at full charge. Would Kenwood fuss at me for not sending the full 13.8 into it? Only way to get 13.8 is to plug it into a car with the engine alternator running. Or use an adjustable power supply like shown here in this video. But I don't have one and if a AC power outage occurs a power supply ain't gonna do no good anywho. So my emergency home battery is my Duracell and I plan to buy a few more like it, put 'em in parallel. My TH-D75 seems to run great on 11 to 12 volts. Sorry Kenwood!! I also use this same battery to power a Yaesu and even my old Radio Shack HTX-202 with different power barrel adaptors. Don't hurt them either.

[@w6gps]

12 volts will work fine. Kenwood is not going to fuss at you :)

[@full_metal2452]

What circumstance would cause an over voltage situation? Faulty power supply?

[@w6gps]

I would say a long term overvotage situation will damage the radio.

[@markr.1984]

It must also transmit full power at only 11 volts too because mine draws 1.8 amps when I transmit at 11 volts just the same as 12 volts. And it's supposed to put out the full 5 watts on the lithium battery and it's maybe only 8 volts or so. So why did they design this radio to cut out and reboot at less than 10 on external DC in but yet runs okay with it's regular battery at only 7.4 to 8 volts? I don't get it, scratching my head! BTW, I've never got my D75 to draw more than 1.85 amps with absolutely everything running. I'm talking the backlight on full time, the GPS on (and everything else I can think of) and then transmit at full power. I have tested the crap out of my D75. I can always buy a new one if I kill this one. To me not expensive.

[@w6gps]

like I said in the video when you plug in the 12volt plug on the side the radio reboots to run off external power and not the battery. 12vlt power management needs higher voltage and more current to charge the battery and run the radio. yeas you can run the radio on 11 or 12 volts fine in the manual it recommends it be 13.8 at 2 amps