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 59833 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:

Setting up a Kratky system for Baby Greens and DWC for larger plants
organic hydro nutrients?
My Very First Setup
Can you water-stress hydroponic plants?
Newbie - want to produce fennel (Foeniculum vulgare) and ruta (Ruta graveolens)
35 day old system...
Thoughts on my setup?
Real Newbie Question
Heirloom Tomatoes Yummy Yummy
distance from light to plants
Flood an Drain Shedule for Beans
Prevent algae growth
Nutrient Recipe for Strawberries?
Spinach Seed Germination
Hydroponic Spinach

Popular Hydroponic Items:


2dbi Gains 824-960mhz 1710-1990mhz Gsm Antenna Sma Plug Connector With 3m Cable picture
2dbi Gains 824-960mhz 1710-1990mhz Gsm Antenna Sma Plug Connector With 3m Cable


2.4ghz 7dbi Aerial Sma Male Plug Connector High Gain Wifi 2.4g Panel Antenna picture
2.4ghz 7dbi Aerial Sma Male Plug Connector High Gain Wifi 2.4g Panel Antenna


2.4g Wifi Yagi Antenna 25dbi With Rp Sma Male Connector Wlan Yagi Antenna  picture
2.4g Wifi Yagi Antenna 25dbi With Rp Sma Male Connector Wlan Yagi Antenna


Brand New Car Antenna Amplifier Radio Fm 88~108mhz Signal Booster picture
Brand New Car Antenna Amplifier Radio Fm 88~108mhz Signal Booster


433mhz 5dbi Gsm Antenna Sma Plug Connector Magnetic Base 3m Ham Radio Aerial picture
433mhz 5dbi Gsm Antenna Sma Plug Connector Magnetic Base 3m Ham Radio Aerial


1090mhz Aerial Mcx Plug Connector 2.5dbi Gains Antenna With Magnet Rg174 1m picture
1090mhz Aerial Mcx Plug Connector 2.5dbi Gains Antenna With Magnet Rg174 1m


2pcs Sma Female Dual Band Antenna 144/430mhz For Baofeng Uv-5r Dual Band Radio picture
2pcs Sma Female Dual Band Antenna 144/430mhz For Baofeng Uv-5r Dual Band Radio


Rf Ground Radial Lawn Staple Anchor Pins  *375 Pieces*  *fast Easy Install* picture
Rf Ground Radial Lawn Staple Anchor Pins *375 Pieces* *fast Easy Install*


 Rf Radial Anchor Pins  Fast-easy-install  375 Pieces Best Pricing Available picture
Rf Radial Anchor Pins Fast-easy-install 375 Pieces Best Pricing Available


900 Mhz 3 Element Pcb Yagi Antenna picture
900 Mhz 3 Element Pcb Yagi Antenna