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Product Review
 
 
DBJ-2
Dual Band Roll-Up Antenna
 2.1 dBi gain (VHF and UHF)
 

Featured in:   QST Mar 2007
Reprinted with Permission of both
Edison Fong and the ARRL
 

Review by: John  'Miklor'   Sept 2014

 
 
 
What's in the Package
The DBJ-2 package includes the pre tuned antenna, ready to unroll and install. The package includes:

- Roll-Up J-Pole, terminated with a BNC-M connector.
- 6 foot RG58 jumper, with BNC-M and BNC-F connectors.
- BNC-F to SMA-M adapter
- SMA-F to SMA-F adapter

This combination of connectors should attach this antenna to virtually any handheld transceiver.


Click to enlarge

Assembly
There is no assembly necessary.  I simply unrolled the antenna and hung in place. The power rating is 50 W, which is more than sufficient for a handheld or mobile transceiver.
 
 
Individually Pre-Tuned
The ham version that I received is tuned to 144-148 MHz and 440-450 MHz. There's also a Commercial/MURS/GMRS version tuned for 152-157 MHz and 460-470 MHz.
 
 
Performance
The specifications state a 1.3 to 1 SWR on both bands. When tested with a commercial meter (Bird 43 Thru-line), the antenna held true to its specifications. These are the same confirmed parameters as the DBJ-1 base Station antenna.

  
 
Performance Reference as compared to standard J-Pole
Link
 
BTW: I mentioned a commercial SWR meter, as many small VHF/UHF meters tend to add currents to the antenna line that can impact the readings. They can come close, but I wanted total accuracy for this test.
 
 
Installation
The antenna has a loop on the top end allowing me to easily hoist into a tree for field operation. I recommend Installing the DBJ-2 as far from metal objects as possible, such as an antenna or tower.
 
The antenna can also be used inside the house or apartment. Temporarily. I have one located in my computer room/office with the top looped around a curtain rod. The window frame is vinyl so there is no interaction with the antennas tuning. 
 
 
So where do I get one?

You can get one by searching DBJ2 on eBay, or the direct price is $28 (for quantity of 4 or more) with a 10% discount for orders over $200.  Ed can be contacted directly at:
edsantennas@gmail.com
1163 Quince Ave., Sunnyvale, CA 94087
408-245-8210
 
 
Conclusion
The antenna is lightweight, efficient, and comes with everything you need to rapid deployment from your Go Box or for Field Day operation.

I can give this antenna a two thumbs up.
 
 
 

From Ed's Desk
More info about the antenna from the developer, Ed Fong WB6IQN
Info Link 

 
 

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