I only post this because it’s something very close to my heart (radio and scanner mods). I bought the radios (and I’ve been working on my licenses studies) without even knowing about this. This is fucking amazing. $50 tri-band radios, who would’ve thought. The only modification needed is a soft mod to boot.
This means it’s a tri-band radio, not just a dual-band radio.
Some resources on the UV-3R programming softwares:
Also, Chirp can do some management things but not the modification.
comments on it:
UV-3R Specs, You can see it’s rated for 136-274 & 400-740 Mhz
a user comment from the yahoo user group:
Hi guys, some more tests I made, it is not possible to have the same combinations unfortunately. We have to choose between:
VHF+VHF and UHF+VHF or VHF+UHF and UHF+UHF.
But the good news is that is possible to expand to:
related: disassembly video: http://www.youtube.com/watch?v=wadgi-6R9n8&feature=related
another user comment:
I did the translation of the web page and got the following:
Open in the frequency range MarkII Did UV3R
Mensagempor John on Thu Dec 01, 2011 04:49
Good has been a fruitful morning, there is much to see questions about
whether it would be possible to open the frequency range of the UV3R and
decided to get to work …
Not only is it possible to expand the frequency of rx / tx and put under
the frequency display to receive UHF also, thus making VHF + UHF, VHF +
VHF, UHF and UHF + VHF + UHF.
Regarding the expansion of the higher frequencies will be 498.995 MHz
will be possible because the frequency from 499 to appear on the display
is 4-0000. For lower frequencies have not done yet is of great trials
which enables safe to 220 MHZ.
Here are some pictures of the tests performed in this long night
Unfortunately, a lot seems to have gotten lost in the translation from
Portuguese to English, maybe someone can clarify it? The project sounds
interesting, especially regarding 220MHz. I would like to receive on
73, Joe, K1ike
The chip used in the radio has support for 222 in the datasheet. I’m sure the RF components are not optimized for it though. What little filtering exists and also the PA. I’d be careful you don’t damage the radio by transmitting. I’d be afraid there’s a mismatch in the circuitry since it wasn’t designed for that. I wonder if anyone will end up blowing TX on their unit by trying this?
Re: [UV-3R] Expand frequency
At 09:28 PM 11/30/2011, you wrote:
>Hello guys it unbelievable but this radio is like a opensource
>maxine you can make amazing things, I have expanded the frequency
>and put the VFO B receiving UHF, now my MarkII makes UHF+UHF.
I had mine doing two VHF freqs at one point. Allowed me to monitor my
local repeater and the local Public Service freq on dual watch. Lost
it, though, and can’t seem to get it back.
The trick is to have the lower display in one monitoring freq, the upper one in
Memory, not VFO, mode with a vhf freq or repeater in it, that way you have vv
I tested my MKII.
I was able to transmit :
From 131.5Mhz to 275Mhz
From 400Mhz to 524.285Mhz
Using this settings, frequency control become somewhat buggy.
Using 131.5-199.895 and 400-499.895 ensure correct frequency settings.
I tested using my AOR-8000 to check that voice is correctly transmited.
Here is my settings.ini :
Erm, since we know that the harmonic of 145Mhz is supposed
to be about 30db down, then it stands to reason that the 220Mhz
power output is probably going be 20+ db down as it passes the
I think if anyone wants to use this rig on 220Mhz then they had better
start looking at a complete re design of the on board filter, along
with the possibility of losing 2m in preference to 220Mhz.
The latter I suppose depends upon what can be done with a filter
However as a general purpose receiver it has it’s merits, including
the fact that nothing actually needs to be rebuilt at all
- Andy -
another user comment from the yahoo user group:
Do not expand from 60 to 490 MHz, the radio receives approximately 128 to
260MHz, and 390 to 520 MHz
Remember that the performance degrades to the bandwidth limits.
also another comment:
Notes on set-up;
Per CT2HPM determined rx limits, I played with the following band definitions on
setup lines used in Config file:
Using version 1.07 Baofeng, version 0.1.12 Chirp — these notes may change
with other versions – please post any results and updates on this neet stuff!
Set VOX to OFF  to keep sound of turning encoder knob from keying the radio
(guess how I know this)
Chirp does not allow entering freqs out of standard radio band edges if radio is
set to UV-3R, leave at generic when entering info.
Radio will not allow setting tx/rx tone codes in 220 band (perhaps same on other
bands, not tested),
Baofeng software will allow setting tones.
Chirp will not upload with out of (nominal factory config ranges anyway) band
I can hear 220 repeaters, but I cannot bring them up. Not sure if poor ant
match (likely), too low power (how far below nominal 2 watts is it
transmitting?), or what, but the TX lite gleams and I can RX there.
Lots of QRM/birdies in the lower 440 range (391-420 or so) — Some may be
Scanning thru these the Freq display shows (going up at 5k Step) “199.995″ to
“1–0.000″ and continues to “”1A0.000″ thru to “1D9.995″ before going to
“200.000″ and then repeats it from “299.995″ to “2–0.000″ and then on to
“2D9.995″ to “300.000″ and starts over at 118.00 after it hits 389.995 –
I don’t know what that is, I don’t have the means to test it.
Anyone have a way to test more on 1.25 meter band?
2 m 144.000 MHz – 146.000 MHz 144.000 MHz – 148.000 MHz 144.000 MHz – 148.000 MHz
1.25 m 220.000 MHz – 225.000 MHz
70 cm 430.000 MHz – 440.000 MHz 420.000 MHz – 450.000 MHz3 420.000 MHz – 450.000 MHz3
Baofeng UV-3R: Expanded Frequencies
In addition to the old trick of opening up the ability to store alpha tags in the Baofeng UV-3R, Frank Fort notes in the comments that he’s opened up the frequencies available to his radio via the software:
“Baofeng Uv-3r Mark 11 is now with a 115Mhz to 530Mhz TX and RX modification, with the modded program…
Close the UV-3R Mark 11 software if you have it running.
Browse to folder where the software is installed. (The default is C:\Program Files\UV3R.)
Double-click the “setting.ini” file.
I tried copy and paste but didn’t worked for me so i just changed manually for this.
Close the file and save the changes.
Run the UV-3R Mark 11 software.
The (Name) option will work in the program only,not on the Baofeng but you can take notes.
So now you have now 3 frequencies choices in the menu up left in the program window. Now that’s fun…I have a Baofeng Mark 11 with 19 menu options and work very well…”
Anyone else try it and have any luck? I know with the Wouxon that you can open it up and receive, but that the radio isn’t designed to transmit outside the original frequencies.
Posted by Brick at 3:21 PM
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Labels: Baofeng, Ham Radio, Software, UV-3R, UV-3R Mark II
AnonymousJan 1, 2012 07:28 AM
Hi I cannot get thismod to work I followed your instructions exactley and in the software it only shows 2 bands 136-174 400-470 and
144-146 430-400 you did not mention which version of the Boafeng software to use to do this mod !
i tryed restoring factory defaults on the radio and reinstalling the Sw with different versions
NO luck! please help
BrickJan 1, 2012 06:50 PM
I think this is the software he was using:
Also, do you have a Mark II version with the 19 menus and dual display?
NateJan 2, 2012 12:30 PM
Are you getting any power on the 222MHz band?
How sensitive is the radio on 222?
Any luck getting into the local 222MHz repeaters with your unit?
BrickJan 2, 2012 01:23 PM
@Nate – I was posting the notes that Frank provided in a comment. I don’t have a Mark II to test. I suspect that 1.25M band might not work very well due to optimizations for the actual 2M/440 bands it was designed to use – both in the “SDR” code and even the hardware (antenna, for example, assuming you are using the stock antenna). People who have opened up the Wouxun have reported poor performance outside the intended bands. I think this might be a similar case.
NateJan 6, 2012 12:43 PM
Brick, Even if it gets out only 25% of the power on 1.25m, that will be more than the 300mW I get from my VX-7.
Naturally, you’ll have to get a new tri-band ducky…
Is Frank available to elaborate more on his findings?