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Ham since 1992, Redmond WA ARES member, electronics buff and dual-band J-Pole UHF/VHF antenna and PowerPole Distribution Board manufacturer, Raspberry Pi dabbler.

Here is the PowerPole Power Distribution Center V.4b board I designed and built, which I sell it as a kit on my website K9JEB.com. This one has a Raspberry Pi single board computer (not included in kit) on the back of it, which is powered by one of the USB modules. The board handles up to 45A total current. It has 8 individually fused outputs, 3 3A USB charger modules, and digital voltmeter. Please see my website K9JEB.com for current pricing and options. They will ship to almost anywhere.

Here is a side view of the board and the Raspberry Pi stack:

PDC corner view

the Raspberry Pi on the bottom of the Power Distribution Center board:

I also make aluminum UHF and VHF antennas which are known as the "open stub j-pole."

Dual-Band J-Pole Antenna 

More pictures are below. These work on Both VHF and UHF bands at the same time, and are tuned for resonance on 146 and 446MHz (in the USA). The "portable" version is the only one I can ship, and it comes with the long resonator element machined into 3 pieces that assemble together, and screw into the base when not in use (as shown). The length is about 21" (535mm) as shown.

Portable J-Pole 

The element parts use stainless steel set screws hold the elements together, and screw the pieces into the base as shown above, for transport and portability.


This antenna has a great VSWR match on both the 146MHz and 446MHz bands (tunable) - usually 1.1:1 or better and 1.5:1 across the entire VHF and UHF band segments. These photos are examples of mobile uses for the dual-band J-Pole.

J-Pole mounted on pole

Here is one on my truck:


























Here is the reflected power image plot (lower reflected power is better) for one antenna tuned to 146MHz and 448 MHz:

Reflected Power Image Plot

If interested in purchasing some of these products, please see my website at k9jeb.com Contact me by email through QRZ or at k9jeb @ k9jeb . com or see CraigsList ads in Seattle listings.

8066657 Last modified: 2017-05-01 03:59:00, 3511 bytes

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