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Details about  Dual Band VHF/UHF Base Station Antenna

Dual Band VHF/UHF Base Station Antenna See original listing
Dual-Band-VHF-UHF-Base-Station-Antenna
Item Sold
Item condition:
New
Ended:
Nov 03, 2011 21:48:55 PDT
Price:
US $26.00
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History:
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Shipping:
$2.00 Expedited Shipping | See details
Item location:
Sunnyvale, CA, United States

Description

eBay item number:
110760945318
Seller assumes all responsibility for this listing.
Last updated on  Oct 21, 2011 21:07:16 PDT  View all revisions

Item specifics

Condition:
New: A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is ... Read moreabout the condition
Brand:

DBJ-1

Dual Band Base Station VHF/UHF J-Pole  - Available in HAM (144-148 MHz and 440-450 MHz) or Commercial (152-157 MHz and 460-470 MHz).  Maximum power input 75 watts. 

True Dual Band base station antenna.  Don’t be fool by claims of dual band performance.  Although traditional VHF J-pole antennas will resonate at UHF, they suffer a –6dB loss at UHF over a ¼ wavelength groundplane.   This antenna was featured in the Feb.  2003 QST and designed by Dr. Ed Fong WB6IQN of UC Berkeley. It is the same antenna that appears on the front cover of the ARRL VHF/UHF Antenna Classics Handbook.  It also won the best paper of the month award.   It offers true ½ wavelength performance at both VHF and UHF with no ground radials.     SWR is less than 1.3 to 1 on both bands. I have my students build these (and often myself) as an exercise.  The proceeds are shared among my students.   The antenna has been so successful that it has been adopted by the Red Cross,  ARES and numerous municipalities for emergency deployment.  Copies of these agencies evaluation reports are available by emailing me.   A copy of the original paper on how this novel antenna works is available from edfong@ieee.org.  Every antenna is hand tuned (by me or my graduate students) to meet specifications.  The proceeds of this antenna go to my graduate students.

 Beware of imitations.  There are others on eBay that virtually make the same claims (and even exaggerate)  and their antennas even look like ours and require you to purchase the PVC pipe.  That antenna is not the same.  It is a standard VHF j-pole that resonates at UHF (all antennas do that). 

This antenna is complete with exception of the 5 feet of ¾ inch Class 200 PVC pipe needed for the antenna.  Individual shipping of the 5 ft antenna is $10 so we rather you go to Lowe’s (stock # 23990)  or Orchard Supply (stock # 648-5908) and buy the PVC pipe for about $1.  It is pretuned for 144-148 MHz and 440-450 MHz for ham bands or 152-157 MHz and 460-470 MHz commercial band.  Please indicate with your order which antenna you wish in the special notes section.   When deployed, it will give about +6dB of gain over a rubber duck antenna.   It comes complete fully assembled with end caps and an SO-239 connector.  Just insert it into the PVC pipe and you are ready to go.   Please email me if you wish an N connector and/or a 250 watt version.  The N-connector is $6 extra and 250 watt version is $10 extra.

The antenna has a lifetime warranty.  Just return it and it will be either repaired or a new one sent to you.

Any questions call me at 408-245-8210 or email me at edfong@ieee.org.

73’s  Ed Fong WB6IQN

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