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Product Review
   VHF / UHF
Digital (DMR) / Analog (FM)
40W  Mobile Power Amplifiers
Part 90 certified
V25(D)  U25(D)

John 'Miklor'  K3NXU
February 2018

V25 U25 series  VHF / UHF Amplifiers

The recently announced BTech Digital and Analog amplifier series puts a whole new spin on mobile operation. It performs more like a mobile than it does an amp. The D series are true TDMA Tier2 DMR amplifiers.
Note: This review was done using an Anytone D868UV on both DMR and analog.
In the Box
Included with the 40W Mobile Amp are:
-  Mounting Bracket
-  3'  Interface Control Cable (Kenwood K1 connectors)
-  3'  RF connect cable (SMA-M to SMA-F)
-  Microphone and Hanger
-  All necessary mounting hardware
-  User Guide

General Description
-  UHF or VHF Power Amplifier
-  2-6W  >  20-40W  Output

                         Modes of operation include:
          V25   U25           V25D   U25D
     Analog (FM)
     C4FM (Fusion)
     P25  (Phase 1)
 >  DMR Tier II (TDMA)
 >  P25  (Phase 2)
     Analog (FM)
     C4FM (Fusion)
     P25  (Phase 1)
A Different type of Mobile Amplifier
I found these to be much more than a typical power amplifier. Although they can function as a simple power 'In and Out' amplifier, this is about as close to a full mobile as you can get. Although the driving force was my DMR handheld sitting in my cup holder, the audio was that of the included hand microphone and the receiver audio out was coming through the built in speaker driven by a four watt audio amplifier.
Transmit Power
I tested the power on two different models. The VHF V25 (non TDMA) and the U25D for UHF DMR.  The power was tested using the analog side of both into a calibrated Bird Termaline wattmeter. The maximum current drain from my 13.6V 30A power supply was just under 6A. This is low enough for the amp to be powered by the 10A accessory jack in your vehicle.
Model 2.0w 4.0w 6.0w
V25 23 33 39
U25D 22 34 37

The basic frame measures 4.6"W x 1.3"H x 5.5"D (excluding the SO-239) and weighs in at 26oz.  I was curious to see the internal layout of the amp and to no surprise, there was a 5/8" finned heat sink spanning the entire length and width of the case along with air vent along the back of the enclosure.
Operating Modes

These are single band amplifiers.
     V25(D) = VHF 136-174MHz
     U25(D) = UHF 400-480MHz.
Note: The V25D and U25D were designed to include DMR Tier II (TDMA) and P25 Phase 2 along with all other modes. Their operation varies slightly.
V25  /  U25
To operate VHF through the UHF (U25) amplifier, or UHF through the VHF (V25) amplifier, simply power off the amplifier. This will allow you to run straight through directly to the antenna without power amplification on that band.
V25D / U25D
These amplifiers will only operate within their specified VHF or UHF range and will not pass the 'other' band. This is due to the circuit switching design of DMR Tier II and P25 Phase 2.
Hook Up
The simplest configuration is using the included RF cable to attach the radio to the amp. You could add a Spkr/Micr to the handheld, but you would still be bypassing some of the best features.
I use the two included cables. The 3' RF cable to attach the radio to the amp, and the control cable. This allows me to use the full size hand microphone as well as connecting the four watt audio amp powering the speaker. The included control cable is compatible with handhelds using the standard two pin Kenwood style connector, such as an MD380, D868, GD77, UV5R, F8HP, UV82, etc.
Note 1:  Although they appear the same, the control cable is not the same as a cloning cable. Where a cloning cable is configured to pass data, the control cable passes PTT and audio.
Note 2:  When running the control cable, you must use the included microphone. The speaker and microphone are disconnected from the circuit when the control cable is plugged in.

I use an Anytone D868 on DMR as well as analog with the hookup diagrammed below. Depending on your radios antenna jack, you may need to pickup an SMA-M to SMA-M adapter. I needed this to connect to my TD-9800.
All channel selection and volume adjustments are done using the handheld. No duplicate programming or code plugs are necessary. Whatever is in my handheld is what I operate in the mobile
Operating my handheld in the low power position, I still get 22W out on UHF and my handheld's battery life remains excellent, but high power gives me a solid 39W.

I was glad to see someone finally develop what is a full featured mobile amplifier capable of  DMR as well as all other modes including C4FM and D-Star that is small enough to mount in the car, boat, and on top of your computer. This amplifier is Part 90 certified and definitely worth considering.

Available from Amazon:     
            V25    (VHF)    
            U25    (UHF)
V25D (VHF +DMR)    

Digital / Analog
Mobile Power Amplifiers

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