Uniden BCD436HP GPS Mod

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I’m curious too. I have encrypted radio for the most part near me so this would only be useful on road trips but with a 8 hour battery it seems almost completely useless to me. I figured there was a LiON battery or some way to charge it otherwise what’s the point for long road trips. And AA batteries wtf. For that amount of money there should be something rechargeable.

But maybe I’m missing something.
I power mine off a usb cable in the car
 

sdrawkcaB

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@SquirrelMaster This isn’t my area of expertise, but I was thinking of ideas that may help with getting a head count and funds set aside from potential buyers. I imagine that there would be a huge interest if this was promoted on RadioReference (RR). Are there different price points based on quantity purchased? Would it be worth while for you or someone working with you to create an IndieGoGo or Kickstarter and be able to accept funds from the interested ahead of time? Ay least by doing this, then you don’t risk what happened with other projects like the RDF Tumbler mugs where more said they’d buy but few actually ended up paying in the end.
 

jake072

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@SquirrelMaster This isn’t my area of expertise, but I was thinking of ideas that may help with getting a head count and funds set aside from potential buyers. I imagine that there would be a huge interest if this was promoted on RadioReference (RR). Are there different price points based on quantity purchased? Would it be worth while for you or someone working with you to create an IndieGoGo or Kickstarter and be able to accept funds from the interested ahead of time? Ay least by doing this, then you don’t risk what happened with other projects like the RDF Tumbler mugs where more said they’d buy but few actually ended up paying in the end.
This is a great idea. Plus they’d have to commit the funds. I’d be happy to help with setup or support for this if needed.
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I power mine off a usb cable in the car
Ok I figured there must be an option for that. I might go looking for one. I read in this thread some problems buying used off of RR classifieds should I avoid that?
 

surprisinguy

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This mini usb charging port was added and the system was changed to LiON batteries. You can run the scanner with it plugged up and it will charge the batteries while it's plugged up. The batteries unplugged last approx 12 hours. You can swap individual batteries one at a time without the scanner turning off. Real handy.
The red led will change to green when it's charged. The little white switch on the right side about a 3rd up is the GPS switch. The 2 pin holes above the GPS antenna are green and red lights to show connectivity. Another led is on the front that changes also to show connectivity.
120355
 

SquirrelMaster

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This mini usb charging port was added and the system was changed to LiON batteries. You can run the scanner with it plugged up and it will charge the batteries while it's plugged up. The batteries unplugged last approx 12 hours. You can swap individual batteries one at a time without the scanner turning off. Real handy.
The red led will change to green when it's charged. The little white switch on the right side about a 3rd up is the GPS switch. The 2 pin holes above the GPS antenna are green and red lights to show connectivity. Another led is on the front that changes also to show connectivity.
View attachment 120355
Oh my god.....
I'll add a battery charging/liion battery mamnagment chips to the final revision of the GPS mod board.

No offense but that looks really ghetto lol.
 

surprisinguy

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oh well :beer:
 

Got Jeep

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Anyone looking for a used 436, make sure you do your research on build versions. :worms:
I would avoid the early builds. There were a few issues. Many of the cheaper ones on Flea bay are first generation.
I bird dogged until I found a used 2018 unit.
 

surprisinguy

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Doing what Uniden should’ve from the beginning!
It really surprises me that they dont offer either one of the mods. They're so beneficial
 

Shodanheart

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I would be interested, how hard would it be to remove if you had to send the radio back to Uniden for repairs?
My radio is currently at Uniden being repaired.


Sent from my iPhone using Tapatalk
 

azslogan

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Maybe interested if I can also arrange installation.
 

SquirrelMaster

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I would be interested, how hard would it be to remove if you had to send the radio back to Uniden for repairs?
My radio is currently at Uniden being repaired.


Sent from my iPhone using Tapatalk
Should be easy enough without leaving any trace.

Maybe interested if I can also arrange installation.
Yeah I am thinking that I'll only be offering it with me installing it so that I can test and make sure it is done correctly.

Interested to see what are next steps?
Well I am finishing up the firmware right now. Next I will redesign the PCB one last time to add a charging circuit for those that want the battery mod as well and then get the PCBs made and parts ordered. Then beta testing. :)
 

azslogan

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Ordered a new BCD-436HP so I’ll be ready for the mod board.
 

Deacon

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@Blizzard was Johnny on the spot and pointed me to a great deal on a 2017 used version that arrived today, high probability of having the C1 capacitor from the factory. Snuck it past the wife, and when she saw it she didn’t even notice that it was way bigger than my 396XT. Still getting used to Sentinel vs FreeSCAN, but it already had the DMR upgrade, and I got the ProVoice upgrade done. Now I just need the GPS/Li-ion mod and a 3D printed mount :)
 

Deacon

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Oh my god.....
I'll add a battery charging/liion battery mamnagment chips to the final revision of the GPS mod board.

No offense but that looks really ghetto lol.
So after a little research, it appears to be based off this mod:

Basically he modified the battery terminals to be parallel rather than series so he could run 3.7V 14500 Li-ion batteries in place of standard NiMH, apparently resulting in longer run-time. And more importantly, he bridged the USB to the battery terminals so it will charge the batteries while plugged in and turned on, not only when it's plugged in and turned off. "The components are a SD103C Schottky diode with the cathode connected to the positive battery terminal to prevent battery voltage from feeding back into the USB port, and a 20 ohm 1/4-watt resistor."

This is interesting to me. Hacking the micro-USB connector into the side and the LED lights into the back is not. Based on what you said above, it sounds like you have an idea to enable this same functionality of charging while plugged in and turned on, in addition to rejiggering the battery terminals to parallel and adding a smarter charge controller?

Dumb question time: as someone not fully up on battery theory, if you can expect to get 800mAh x3 = 2400mAh out of a Li-ion parallel setup, how is it that it would extend operation so much over 3x 2400mAh AA NiMH batteries? Shouldn't they equal out to about the same? He claims he got 14 hours out of it vs 9 hours max on NiMH. Maybe he was just using smaller 2000mAh versions, and that would explain the difference? I have some AmazonBasics 2400mAh NiMH AA batteries that seem to do pretty well, but I've never tested how much I can get out of them. I like the idea of modern "protected" Li-ion cells that have no memory and should last through a lot of small charge cycles. It seems like the highest capacity legit 3.7V 14500 options out there are 900mAh. Maybe that would be worth it. Not really sure.

He does mention, though...

"https://www.ebay.com/itm/USB-Lithiu...4-2V-Boost-Step-Up-5V-9V-12V-24V/322562445571

This board has a USB Li-ion battery charger, but it also has a regulated boost converter for the output, which you can adjust from 4.3-27V. Part of the reason using Li-ion batteries didn't extend battery life much in my previous test was because the scanner shuts down at 3.1V, which is before the battery is completely discharged. This board will allow the Li-ion battery to discharge completely before the output drops below 3.1V, which should extend runtime significantly. Stay tuned... "
 
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surprisinguy

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I probably get 10 hours out of my Li-ion batteries minimum, depending on how loud the volume is set.
I have been having problems with the connection between the cable and plug on the unit. I think it's wearing out from all the plugging/unplugging.
The lowest that my batteries have discharged is 3.1 - The scanner can shut down anywhere between 3.4 and 3.1 though
 
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SquirrelMaster

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@Deacon
The plan is to make it a completely separate system. The usb in the side is so ghetto. I don't want anything to look out of place.

You would be able to always pop in the stock nimh batteries or take them out and stick a lipo or liion battery pack in its place. It would have a separate connector hidden in the battery tray but would all be contained in there. From that point, it would detect what battery is inside and charge over the original USB port.

I've also been playing around with some wireless charging chips and coils to see if I can pair something up with @OBeerWANKenobi 3d printed OBGrip....


Been pretty busy lately however so it's going a bit slowly but I'm getting there.
 

Deacon

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...or take them out and stick a lipo or liion battery pack in its place. It would have a separate connector hidden in the battery tray but would all be contained in there.
Interesting. So using something like 14500 batteries with solder tabs (rather than contacting the factory battery terminal tabs like a standard AA battery), create your own battery pack with separate connector? I like that! Especially if the factory mini-USB port can be used to charge it no matter what, including while the scanner is powered on. Maintain standard/factory functionality but expand it further.

I've also been playing around with some wireless charging chips and coils to see if I can pair something up with @OBeerWANKenobi 3d printed OBGrip....
I just got a semi even thinking about that. The fewer things to physically hook up, the cleaner and better and less wear on ports. I run a Scosche MagicMount Pro Charge for my phone mounted in each of my vehicles for that reason!

As long as no RF interference, and assuming a coil is the right size, power, cost, etc, that can be embedded in the OB-GRIP in the right spot, I can't see any downside. I mean, really. None.
 
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SquirrelMaster

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I just got a semi even thinking about that. The fewer things to physically hook up, the cleaner and better and less wear on ports. I run a Scosche MagicMount Pro Charge for my phone mounted in each of my vehicles for that reason!
Yeah I figured if I can eliminate the GPS cable, I should also look at eliminating the USB cable.
Still its just a thought and not a sure thing.

Need to test and see how the inductive charging would affect the radio in terms of interference and whatnot. Plus would add weight, bulk, and cost.
 

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