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Old 02-10-2018, 03:03 PM   #1
goontron
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Default 2m/70c Radio battery eliminator build

Well, this timeline is going to be full of holes here. Make sure you format the right SD card kids! Anyway...

So, the battery from my old dual band radio finally quit. I decided to build a battery eliminator.
The case is about 1 1/2" x 3" x 1/2" OD, so space is a bit tight, but not horrible.

Here's what it looks like gutted and my first attempt at a ground bus installed. (Hint, tin coated steel doesn't stick to silicone very well.)

Next, the picture of my first (Failed) attempt.

Why it no work? battery dead? 5.5v? WTF

Doh! I that read wrong. Thats a 6v regulator, not 8v

Well, lets try switchmode then!

It Verks! *pop* ...are you shitting me? It committed suicide. LED is out.

Round 2?

Round 2 Verks!

Into the case it goes. I had the whole assembly process photographed, but oops.

Still Verks!

Well, glamour (shame?) shots then.

I forgot the nylon nut and bolt.... Crap. I may fix that one day.

DC 20v test. Looks good.

AC 20v test. Also good.

Let me shoehorn in some firmware fuckery proof here.


IN: AC ~9v-30v/DC +/-10v-35v OUT:7.6vDC

Not a bad little eliminator.
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Things I've fixed: anything from semis to crappy Chinese $2 radios.

"Dude, this is Wyoming, i hopped on and sent 'er. No fucking around." -- Me

My "Extremest" views: I will spread my knowledge to whoever will receive it. It is their prerogative if they do bad with it.

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Last edited by goontron; 02-10-2018 at 03:23 PM..
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Old 02-10-2018, 06:32 PM   #2
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Default Re: 2m/70c Radio battery eliminator build

nice - a UV5R, (or is it the 8W model??)
that is a bad idea - the regulator will cook when you transmit 5W.
i would put the regulation at the other end of the cable with a heatsink on it.
then use the battery shell for extra filtering - inductors,caps etc.

Last edited by stj; 02-10-2018 at 06:36 PM..
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Old 02-10-2018, 07:38 PM   #3
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Default Re: 2m/70c Radio battery eliminator build

Its the BF-F8HP. Ive been stress-testing it all day QSLing with the KC7SNO and WU7G/R (2m,70c respectively) repeaters and managed to catch some skip from Denver. My filtering is good enough it seems, and being a 3 amp regulator she gets a bit toasty, but nothing extreme.

Last edited by goontron; 02-10-2018 at 08:27 PM..
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Old 02-11-2018, 08:51 AM   #4
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Default Re: 2m/70c Radio battery eliminator build

162.55 is the nat. wether sev. As I remember 144 . Mhz is 2 meter ham .
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Old 02-11-2018, 11:41 AM   #5
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Default Re: 2m/70c Radio battery eliminator build

^ Yep. It can receive down into those bands. xmit, no. I was using it as a recive test. Interesting thing about the 775, its sponsored partly by the NWS, and they run nets on it.

Quote:
The daily weather net is at 6:45 am (local) on the 146.775 repeater.
http://www.shywyarc.net/repeaters_and_nets_affix.html

Last edited by goontron; 02-11-2018 at 11:48 AM..
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Old 02-11-2018, 11:27 PM   #6
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Default Re: 2m/70c Radio battery eliminator build

if you program it with CHIRP you can extend the frequency range a fair bit
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Old 03-23-2018, 08:53 PM   #7
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Default Re: 2m/70c Radio battery eliminator build

So, i just wanted to post an update. I got the MFG's battery eliminator, and surprise surprise, it's an older design, same spec, with less filtering and no AC bridge. And a fuse.

Glory shot


Houston we have a problem. Why is the cord coming out the bottom? Well that won't sit in a cup holder!


Houston, another problem. Dead short on the input! Diode pushed into the heatsink. Easy fix. Also, Focus you FAK!


ChengX caps. This is actually probably one of the better applications for these caps....


Board overview. These is why i say old design. Single layer board, that chip was designed to be a simple retrofit with minimal redesign of the board from a linear regulator according to the datasheet, and it switches at a paltry 52Khz, compared to the 1Mhz in the one i built.


The underside shows much room for improvement...


Now for the reason i got this. It looks a hell of a lot better than a lighter plug to banana plugs, then a set of roach clips hooked onto them.

I personally don't care, but my boss very well might while im opertaing a company truck. Though, with how the inverter is wired in......

So, thats my excuse for getting it. Being able to see how close my design was compared to one built by the maker of the radio, was just a nice extra.
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Old 05-16-2018, 09:08 AM   #8
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Default Re: 2m/70c Radio battery eliminator build

how long did that battery last before it became unusable and ripe for becoming a battery eliminator cartridge?
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Old 05-16-2018, 09:13 AM   #9
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Default Re: 2m/70c Radio battery eliminator build

^ About half a year and a couple seconds in my morning coffee...
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Old 05-16-2018, 09:22 AM   #10
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Default Re: 2m/70c Radio battery eliminator build

Couldn't find another way to get your daily lithium dose?

Hmm... I might be forced to get a cheapie radio, curious about the battery management on these devices and how long the cells last before they become unusable.
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Old 05-16-2018, 09:24 AM   #11
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Default Re: 2m/70c Radio battery eliminator build

^ Well, the Yaesu i have is good for 300 cycles, and its far from a cheapy radio.
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Old 05-16-2018, 09:40 AM   #12
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Default Re: 2m/70c Radio battery eliminator build

Crap, I was about to ask how many cells it was, but at 7.6V it must be 2-cell, answered own question.

Why? At that point, it starts separating the cheapie and the better designed battery packs/systems... I also suspect there's no internal SMPS inside the HTs to boost voltage and thus power output/range goes down as battery runs down too (at the expense of noise generated by the SMPS?)
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Old 05-16-2018, 10:38 AM   #13
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Default Re: 2m/70c Radio battery eliminator build

^ Current draw increases.
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Old 05-16-2018, 12:15 PM   #14
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Default Re: 2m/70c Radio battery eliminator build

Interesting, so there is a boosting regulator in it for when the battery drains down...?
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Old 05-16-2018, 12:46 PM   #15
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Default Re: 2m/70c Radio battery eliminator build

well, the UV82 battery is 7.2v Lithium-Ion and the charger is a slow charge at something between 8 and 10.5v i dont have it to hand to check.
the battery has internal protection and the charger has a chip in it - i can pull the exact details from another pc later.

i should also have the UV5r schematics.
i'm pretty sure there is no boost, just direct battery for the transmit circuit, and a regulator before the digital stuff.

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Old 05-16-2018, 12:49 PM   #16
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Default Re: 2m/70c Radio battery eliminator build

btw, if you buy a radio, the UV82 is the one to get.
better speaker than the others and double PTT buttons that you individually assign!!
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Old 05-16-2018, 01:01 PM   #17
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Default Re: 2m/70c Radio battery eliminator build

Interesting. So I need to get a radio with published schematics!!!
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Old 05-16-2018, 01:09 PM   #18
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Default Re: 2m/70c Radio battery eliminator build

not much in them, they use digital direct conversion and modulation.
if you expect a bunch of cans and coils your not going to find them!!!
that's how they got them so cheap, they are almost software based.
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Old 05-16-2018, 01:11 PM   #19
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Default Re: 2m/70c Radio battery eliminator build

your gonna like this!!
http://radioaficion.com/cms/category/china-radio/
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