Take apart the radio. Remove the knobs remove the screws on the back.
Under the battery is a connector is a connector we will remove later. This will allow wires to enter the radio without removing the LED as you see in the old mod.

Remove the 2 belt clip screws and the plastic under them you will use these 2 screw holes to mount the radio to your case so it stays upright and stable.

We will not use the battery you cant use the charger and battery so what we do is use a regulator set for 3.7 volts this runs the radio just fine. Remember these batteries could explode if overcharged so don’t use it.

Once taken apart you can un sorder the speaker so you can remove the front.

Unsorder the connector for the battery so we can run in power round and cos. You may wish to use shielded wire for cos connection as noise may be on the wire.

There are several different versions of the BF888 so the COS point can be in several different locations. But its on pin 1 of the chip on the back side of the board. Take care in running the wire from behind around to the top because we want to reinstall the back which is the sheild and we don’t this wire to get pinched.

All audio in and out and PTT is handled by the mic cable so nothing else to modify. Get a mic cable off amazon i have been looking for uncoiled but cant find that the coined one will need some space to fold it around.

More photos later check back..

You need a voltage regulator likely a LM2596 However some packages may create noise. So you might try more than one version one of my LM2596 caused a buzz when I shared power with the pi. Position is very important place the pi a foot away from the radio in like a amno box. Some people lower the power in the radio but if thats what your gona do then just use a usb radio and dont use the bf888. we need max power in our moble so we can go inside wallmart and still get a signal.

Orginaly i built these with 5v in. But some cars will have low voltage so im now using 12v in and a 12v to 5vusb regulator this allows a 12v fan as on this old one it has a 5v pi fan. Fans are needed in cars it gets very hot when you not in the car. And i suggest the script to report hi temp back to you on the link..

The high temp alarm is built into my node manage but im going to release it as a stand alone script in a few weeks.

There is a new cable that works on VOX and has a built in sound card for those that dont want to modify at all.

https://www.amazon.com/dp/B0DF8GSB4C?th=1

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The AC voltage in converted to DC by diodes and then kept at the proper dv voltage by a regulator. In modern cars this is all built inside the alternator. The battery is charged by this voltage and the battory acts like a large capacitor to straighten out the signal. When you get a whine what you are hearing is called Ripple. Ripple is ac voltage riding on top of the DV voltage.

In the above example the 12 volts is present but its not a straight line it has ac in it. It could also have different types of spikes other unregulated voltage.

The sound in the radio will change as you speed up or slow down because the speed of the alternator is changing changing the frequency of the AC. A good technician can hear the ripple over the air because of the change of the frequency of the sound, nothing else does this.

So me people will tell you need to ground. Some will tell you to run straight to the battery. But they don’t know why. To understand how to fix alternator whine on GMRS you need understand what it is.

1. Its AC voltage or spikes riding on top of the DC.
2. Simple power supply theory taught in the 70s before IC power supplies.

In order to get rid of ripple you must remove the AC using a cap and a choke. They sell 12v noise filters for car audio that will remove this and there is no need to run heavy wires to the battery. .

When looking for a noise filter be sure it has 2 caps one on each side of the coil. Get the largest MFD value for the cap you can find. I make my own but I have lots of caps.
This is called a PI filter this circuit flattens out the dv voltage removing the ripple.

There do exist 12v noise filters with only one cap but I would not recommend them.

But you say what about running direct to the battery. When you do that the battery is acting as a cap partly flatting out the ac. However if the ripple is large then the battery cant fix it. So it is not necessary to run to the battery all you need to do is use a pi filter to remove the ripple at the radio.

But what about torids they say just put torids on it. A torid is an inductor just like a coil. The inductor blocks AC but the CAP stores voltage and releases in the the low point of the ac signal leveling out the voltage. A torid cant do that. You need both to filter out AC.

SO don’t waste your money it will cost less just to use a filter than to buy the wire to run to the battery and the battery can only do minor filtering so it still may not work.

But someone said that I should install .01 cap the radio. This is for something totally different. Old cars used to have a cap like this in many places under the hood to help stop noise from getting into lines from the points and such. The value is to small to stop RIPPLE loud enough for you to hear.

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FCC-certified for GMRS FCC ID: 2AGNDGMRSRPT50 Type 95E

https://baofengtech.com/product/gmrs-rpt50/

BTECH GMRS-RPT50 User Manual

No word yet on linking information. And where you can get COS.
However the repeater ID is transmitted without tones so if you RF link it will not go back into the net.
Also if you program your radios with receive tones you wont hear the ID.

IF anyone has this repeater it would be great if you would let us know if you have been able to find the COS

Its claimed to be 50Watts 100% duty cycle but data submitted to the FCC states 50% duty cycle 46.7735 watts

The repeater appears to be a modified Kydera TR-6000DU Digital repeater with special firmware to disable all the digital modes. TR-6000D.pdf They have summitted it to the FCC and its approved for GMRS. The Kydera one is approved type 90.
FCCID VO6TR-6000DM Type 90, Link to manuals and photos.
Owners Manual 

The following are inside photos of the original digital version.

photos of digital version

As of 12/24 its backordered at $1,499.89

The post BTECH GMRS-RPT50 50W GMRS Repeater first appeared on Louisiana Nationwide.

1. N5R-313140925N: Firmware update for the N5R model with a release date of September 25, 2014.
2. N5R-313140923N: Firmware update for the N5R model with a release date of September 23, 2014.
3. N5R-219141006N: Firmware update for the N5R model with a release date of October 6, 2014.
4. N5R-217141006N: Firmware update for the N5R model with a release date of October 6, 2014.
5. N5R-215141006N: Firmware update for the N5R model with a release date of October 6, 2014.
6. N5R-213140906N: Firmware update for the N5R model with a release date of September 6, 2014.
7. N5R-209140525N: Firmware update for the N5R model with a release date of May 25, 2014.
8. N5R-30140823N: Firmware update for the N5R model with a release date of August 23, 2014.
9. N5R-30140725N: Firmware update for the N5R model with a release date of July 25, 2014.
10. N5R-0140525N: Firmware update for the N5R model with a release date of May 25, 2014.
11. N5R3409150319N: Firmware update for the N5R3409 model with a release date of March 19, 2015.
12. N5R3405150121N: Firmware update for the N5R3405 model with a release date of January 21, 2015.
13. N5R3403150105N: Firmware update for the N5R3403 model with a release date of January 5, 2015.
14. N5R3401141113N: Firmware update for the N5R3401 model with a release date of November 13, 2014.
15. N5R2407141006N: Firmware update for the N5R2407 model with a release date of October 6, 2014.
16. N5R2401141006N: Firmware update for the N5R2401 model with a release date of October 6, 2014.
17. N5R340A150121N: Firmware update for the N5R340A model with a release date of January 21, 2015.
18. KG-UV6: Firmware update for the KG-UV6 model.
19. baofeng_BF-888_20200601: Firmware update for the Baofeng BF-888 model with a release date of June 1, 2020.
20. BFS313: Firmware update for the BFS313 model.
21. BFS311: Firmware update for the BFS311 model.
22. BFP3V3-BF-F8HP: Firmware update for the BFP3V3-BF-F8HP model.
23. BFB308: Firmware update for the BFB308 model.
24. BFB307: Firmware update for the BFB307 model.
25. BFB305: Firmware update for the BFB305 model.
26. BFB301: Firmware update for the BFB301 model.
27. BFB299: Firmware update for the BFB299 model.
28. BFB297: Firmware update for the BFB297 model.
29. BFB296: Firmware update for the BFB296 model.
30. BFB295: Firmware update for the BFB295 model.

Please note that these firmware updates may enhance performance, fix bugs, or introduce new features. Always follow the manufacturer’s instructions when updating firmware on your radio equipment.

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The settings for multi phones (which phones will ring) are on the website not inside the app so install the app then go over to the website. google voice And set which device will ring.

You have to set the network radio to receive calls in the above menu

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