Hydroponics Online Store



Hydroponic Systems

Hydroponic Grow Lights & Bulbs

Hydroponic Tents & Grow Boxes

Hydroponic Ballasts

Grow Light Reflectors

Hydroponic Nutrients

Grow Media Rocks

Hydroponic Pumps

Hydroponic Pots

Hydroponic Books

Meters

Hydroponic Exhaust Fans

Hydroponic Seeds

Hydroponic Foggers

Home Store Blog Forums FAQs Lesson Plans Pictures


Search:



VHF/UHF Slim Jim J-Pole Dual Band 2m 70cm Antenna jpole For Sale


VHF/UHF Slim Jim J-Pole Dual Band 2m 70cm Antenna jpole



This item has been shown 55659 times.

Buy Now

VHF/UHF Slim Jim J-Pole Dual Band 2m 70cm Antenna jpole:
$24


NEW! Dual Band Slim Jim J-Pole More gain than a standard J-pole!
Thank you for visiting my sale. Here we have a dual band Slim Jim that still has that great Slim Jim gain but allows operation on the 70cm band also. The secret is in the coax stubs that act as traps at high frequencies and shorten the electrical length of the antenna.
Features:
Length - 6 Feet tip to connector.
1.5:1 Bandwidth > 4mhz
Power Handling - 100 watts
Gain - Approx 6dbi 2m 5dbi 70cm
Weight - 6oz
Connector - so-239 / N-Female*
Construction - 450 ohm ladder line with short Coax stub. You can see from the illustration that the half wave radiator folds back on itself. This essentially creates an end fed dipole yet still retains the j match system. The traps isolate the bottom of the antenna at high frequencies to allow dual band use. The lower half of the antenna becomes a 70cm j-pole. At 2 meter frequencies the wave doesn't see the traps and acts as a regular Slim Jim antenna. This antenna can be supported by many things including trees, ceilings, curtain rods and pretty much anything else you can dream up that will support 6oz of weight and keep the antenna a couple inches away from solid objects. These antennas are great for E-COM activities, field expeditions, hotel rooms and base station use too. I use one as a base antenna myself as it performs better than my 1/2 wave vertical. This antenna is available with either a female UHF or an N Connector please specify in note to seller on Paypal or through personal message which connector you desire. If there is no note the default connector is the female UHF.
The matching section is soldered then sealed with double wall adhesive type Heatshrink to protect it from the weather. This plot shows the resonant areas of this antenna. The 2 meter portion still retains its sharp highly resonant features. Plus we add quite a bit of bandwidth on 70cm making this a great little field antenna.
* I use Amphenol N connectors they cost more than double my normal connectors. I therefore charge an additional fee of $3.00 for N connectors. Please request an invoice if you require an N so I can adjust the price.Item pictured is not actual antenna but all are built the same.Most of the cabling on this antenna is made in the USA.

On Sep-18-09 at 19:16:12 PDT, seller added the following information:

See the reviews at E-Ham and


Buy Now


 

Hydroponic Forum Discussions:

Anyone try those automation products?
Heirloom Tomatoes in Rockwool - My first setup
Beginner troubles
Hydroponics System Care and Maintenance
Hydroponics System Care and Maintenance
Hydroponics in the winter
New member with a question.
Room or a tent?
First effort drip bucket system 14 headed to 20!
I have a question.
Hot climate growing pains!
Newbie here with a question of course.....lol
Should I be concerned about this mold?
What wrong with my leaves?
Newbie Could Use Some Advice
New hydroponics setup!!
Need sage advice, I can't seem to make this work. :(
Tomato Lower Leaves Yellowing
Fogging basil!
Struggling with my bell peppers

Popular Hydroponic Items:


Shure Ua820g Half Wave Antenna 470-530 Mhz picture
Shure Ua820g Half Wave Antenna 470-530 Mhz


Lectrosonics Alp700a Log Periodic Antenna 500-800 Mhz picture
Lectrosonics Alp700a Log Periodic Antenna 500-800 Mhz


 Sma Dual Band Radio Antenna F Kg-uvd1 Kguvd1p  picture
Sma Dual Band Radio Antenna F Kg-uvd1 Kguvd1p


4.75
4.75" Bnc Rubber Duck 150mhz - 160mhz Flexible Antenna


Asp  Pdl Ii    V-122  Beam  New  In  Box picture
Asp Pdl Ii V-122 Beam New In Box


Cornell-dubilier Cde  Antenna Rotor Controller  Cb Ham - 4 Wire System picture
Cornell-dubilier Cde Antenna Rotor Controller Cb Ham - 4 Wire System


Nagoya Rb400b Mobile Antenna Mount For Ft-2900r Smp-908 Kg-uv950r Car Radio picture
Nagoya Rb400b Mobile Antenna Mount For Ft-2900r Smp-908 Kg-uv950r Car Radio


Antenna Isotron-80   80m picture
Antenna Isotron-80 80m


Miniwhip Active Hf Antenna, Swl, Communications Receiver, Rx Antenna Pcb picture
Miniwhip Active Hf Antenna, Swl, Communications Receiver, Rx Antenna Pcb


Qrp Dipole Antenna Center Insulator ( Bnc ) ( 2 Pcs. ) picture
Qrp Dipole Antenna Center Insulator ( Bnc ) ( 2 Pcs. )