Many thanks to Pedro (PP2PB), who shares the following article about his portable field radio kit, which will be featured on our Field Kit Gallery page.

Pedro’s (tr)uSDX Compact and Affordable Field Kit

by Pedro (PP2PB)

Here’s my new kit.

This kit weighs just under 1,2kg and has phone and CW operations in mind. I might add some cables for digital modes, but I haven’t tested this rig with digital modes, just yet.

The (tr)uSDX was bought assembled with the LO bands RF board, and I assembled the HI RF board myself. I got Adam’s alternative case printed out for easy band switching and did a minor mod to the RF boards soldering a Zener diode reverse polarized as a high SWR protection.

I also added a USB port to the battery pack because the (tr)uSDX can operate with around 0,5W directly from USB and that’s a great way to test for SWR and fine tune the antenna without stressing the finals.

The manual antenna coupler is also my creation and even though it doesn’t appear on the exploded view it does fit in there no problem (it was added after I took the pictures).

Gear List:

Small Molle ag
(tr)uSDX with both Hi and Lo bands RF boards
Alternative case by Adam K6ARK for easy RF board switching
RG316 2 meters
27MHz Telescopic antenna works on 10m –
Small counterpoise wire
Homemade 49:1 UNUN made with FT82-43 toroid
3D Printed CW Paddles for the Quansheng K5 (needs minor modification to work on regular radios)
Male to female P2 3.5mm cable
Homemade 6W dummy load made inside a 90º BNC male connector (2x 100ohms 3W resistors in parallel) – great cheap insurance with these simple rigs.
Small USB Cable
Generic Earbuds
(tr)uSDX power cable with powerpoles
20m of 24AWG wire for the primary antenna with some generic red paracord for setting it up
Charger for the battery pack with powerpoles
Homemade battery pack using a 4S battery holder with 3x 18650 cells and a BMS board, and the extra space for a step down DC converter with USB out and the 12V powerpoles
Homemade manual antenna coupler