Review – BTech APRS-K2 Cable (TRRS/APRS)

by John ‘Miklor’

It’s long overdue, but there’s finally a TRRS/APRS cable available for radios using a standard Kenwood style K2 connector.

I’ve been wanting to get involved with APRS for a while now, and this made it extremely easy.

APRS-K2 interface cable
The APRS-K2 cable allows you to interface your handheld transceiver with your existing mobile device, including. iPhone, iPad, and Android.

One end of the cable uses the Kenwood style K2 connector, while the opposite end is aprs-xover-25terminated with a TRRS connector. Also included with the APRS-K2 is a Reverse Adapter to insure compatibility with all devices. This adapter allows cable to connect to earlier 3.5MM TRRS standards, such as Nokia.

App Driven
The APRS-K2 cable uses a virtual TNC found in several apps, such as APRSDroid,, and Pocket Packet. Plug in the cable, turn on the VOX, and you’re pretty much set to go.

Product Description
BTECH APRS-K2 TRRS / APRS Cable A simple way to start using APRS by using devices you already own. The BTECH APRS-K2 Cable will quickly connect your radio to APRS by using virtual TNC (app driven) on your tablet or device. The APRS-K2 cable is built with a custom circuit board that will automatically adjust the audio for clear packet transmissions with minimal adjustment; along with protecting your devices from strong over modulated signals.

Along with allowing APRS functionality the APRS-K2 cable can provide a simple interface gateway to allow several features to your radio!

Easily record radio conversations:
By connecting the APRS-K2 cable between your radio and any recording (line-in) device.

Use the APRS-K2 cable as a Mic In Connector:
Set up VOX on your radio to accept any form of incoming audio – such as a Push-to-talk application on a Phone – or a Line-out application from your computer.

Use the APRS-K2 cable to push transmissions over a speaker system:
Easily play audio over a intercom or speaker system from your handheld.

With a backup radio and your own ingenuity, the APRS-K2 cable can serve as an interface for a variety of applications for any amateur. Compatible with Kenwood K2 Accessory Slot Radios (such as BaoFeng, BTECH, Wouxun, TYT) Compatible with all phones, tablets, and computers with 3.5MM Audio In/Out Ports

APRS-K2 Cable
Reverse Connector Adapter
Quick Start Guide


The cable comes with a simple one page instruction sheet which should have you up and running in about 10 minutes after the appropriate app is loaded.
–  Plug in the cable
–  Set your handhelds volume control
–  Turn on the VOX
–  Set your handheld to 144.390 (US)
–  Activate the app

That’s all it takes. If you’ve been considering building an APRS cable, you might find this an easy Plus and Play alternative.

The APRS-K2 can be ordered from   Amazon, or if outside the US, you can go to their website and contact them directly.   Baofeng Tech

Too many toys, too little time.
John ‘Miklor’   K3NXU

“Could you please review the Kenwood TH-F5?”

Kenwood-TH-F5Dear reader(s), I would if there was such a radio. The Kenwood TH-F5 doesn’t exist. It’s a fake, one of many. The radio is actually a cheap TYT TH-F5 mono-band HT.

Counterfeiting, a Chinese Disease
Counterfeiting well-known brands is all too common on websites like So far I have never (ever!) seen genuine Kenwood, Icom or Yaesu radios there.

Most fakes are easy to recognize, but some are not. I’ve ran into counterfeited radios which looked absolutely identical to the original, but a small piece of text gave them away in the end: “Works just like the original.” Ha!

In short: even when a radio looks genuine, please remember that you can’t get a top brand for less than $50. Period. When in doubt, contact your local Kenwood, Icom or Yaesu dealer and have them check it out.

No reviews?
No, I won’t review counterfeits. I’ll report them instead.

Field Day VRZA, Almere (JO22OI)

Last weekend, we had our last field day of the year. The weather couldn’t be better! Every day before and after the field day, we had rain and wind… It was an excellent opportunity to test my latest field day antenna.


The antenna consists of a 12 meter high ‘fishing rod’, some wire and a balun. If left full size, it’s a vertical for 40 meters. If you disconnect the upper part of the wire (and do the same with the radial), the antenna will resonate in the 20 meter band.


The balun is clamped to the lower part of the rod.


I used the antenna in combination with a Kenwood TS-570D(G). The antenna performance proved to be much better than expected! Also on the table: a Yaesu VX-177.


My dog didn’t care much about the QSOs, but she loved the BBQ!