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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. K9JEB.com is my website where my ham radio pages, and all of these products are featured.

My latest project is the Power Transfer/Charger board - it's a circuit designed to fit on top of a 9Ah gel cell battery, and both charge the battery and also transfers power from battery to any equipment connected to the board when the external power goes away. Similar to an online UPS but for DC power. These kits are available now to order on my website http://k9jeb.com/OrderForm.aspx#PTC

PowerTransferCharger on battery

It has a 3A USB power module, adjustable over-voltage charging protection, and a switchable DVM that covers both input voltage and battery voltage. It uses the latest high-power low-resistance MOSFET transistors to control all power to and from the battery without the need of a heatsink. The circuit is able to handle 12-15A of load continuously drawing from the battery, and will recharge the battery when external power is applied.

The prototype board is shown here on top of a 9Ah gel cell battery, and is powering a Yaesu FT-857D radio being used on 50W VHF simplex.

This is a new board - Power Connector kit design, a very simple single fuse board that has one input and 4 outputs. It sells for as low as $9 in quantity. It is much simpler to build than the bigger power distribution kits, but doesn't have as many of the features either. It does have some really nice options however also.


















Power Connector with hard wired input and USB Power Module

This is the MAX 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.

8552498 Last modified: 2018-01-02 02:00:01, 6110 bytes

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