HF EmComm Jr Antenna
$199.00
End-fed 6-80M EmComm antenna
MODEL: HF JPole Jr
6-80 meter end-fed 34-foot long HF Antenna that enables you to use a tuner to achieve a near perfect SWR, with limited efficiency while using a tuner on 80 meters.
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Specifications
- Frequency Coverage: 3.5-54 MHz (80-6 Meters)
- Peak Power: 250 PEP SSB, 125 CW, or 25 watts for digital modes. NOTE – The MIL-STD-188 M110a digital communications mode is rated at bursts of 100 watts digital for up to 1 minute using the MIL-STD Data Modem Terminal (MS-DMT) and Automated Message Terminal (AMT) software applications.
- Weight: 1 pound
- Configuration: End-fed configurable as Sloped or Horizontal
- Length: 34 Feet
- Connector: UHF type SO-239
Analysis
| 34 Foot element | |
| Band | SWR |
| 6 Meters | 1.50 |
| 10 Meters | 2.39 |
| 12 Meters | 2.49 |
| 15 Meters | 1.60 |
| 17 Meters | 2.9 |
| 20 Meters | 2.5 |
| 40 Meters | 2.9 |
| 80 Meters | 5.5 |
Deployment
Run the antenna as a sloped system for good NVIS and DX results, or a flat top for good NVIS results. We test the antennas at 6 feet, however higher placement will enhance DX results while lower placement will enhance NVIS.
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Specifications, prices, and descriptions are subject to change without notice.
Reviews
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| Weight | 80 oz |
|---|---|
| Dimensions | 12 × 9 × 5 in |
| availability | |
| brand | |
| color | |
| condition | |
| Manufacturer | |
| mpn | |
| product type | Base HF VHF UHF Antennas, End Fed Dipole Antennas, Marine and land-based VHF UHF HF Mobile Antennas, Military Aviation Commercial Antenna, Portable HF VHF UHF Antennas, VHF UHF HF Antennas |
| SKU | |
| VHF UHF HF Antenna type | HF Base Stealth Antenna Systems, HF Dipole Antennas, HF Emergency EmComm Antennas, HF Military MilCom Antennas, HF Portable Stealth Antennas |
| GTIN |
Q & A
You may need one mainly if you are experiencing common mode current, especially after you have placed ferrite beads on the devices power cord that is experiencing common mode current. Note - Sometimes resolution is made by simply moving the devices power cord to a different circuit. If, for example, you still hear your own transmission coming from a pair of speakers then we recommend reading the following article: "The Need (or not) for Antenna Baluns or Chokes": https://www.alphaantenna.com/community/hints-and-kinks/news/the-need-for-antenna-baluns-ensuring-efficient-signal-transmission/
To enhance NVIS, mount the element lower than 8 feet in a horizontal configuration. For better DX, mount the element in the clear and sloped into the direction you want to launch your signal. For example, with one end at 6 feet and the other at 30 feet (Note that higher typically results in more DX). Again, the slope helps determine the angle and direction that your signal is launched.
The JPole (Jr & Sr) are derived from a fan dipole’s design, which simply enables RF to select the element(s) with the path of least resistance for the resonance required to provide acceptable SWRs. The second shorter element is an active element that that is attached to the longer element in a zip cord configuration. This enables the end fed JPole antenna to have access to 3 electrical lengths of wire. These lengths are: 1) The shortest element, 2) the longest element, 3) and an even longer combined length of 1 and 2. Then an inductor matches the impedance at the point where your 50-ohm coax attaches to the match. Operationally, the JPole Sr is designed with the optimum lengths of elements, and the 34-foot JPole Jr was designed for those who do not have the room to deploy a 60-foot JPole Sr antenna.
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I have 2 64ft end feds from Alpha Antenna mounted as opposite sloppers that work amazing. This 34ft version is for my Car portable set up. It takes me 7 mins to set up my rig and my first contact was 5000 miles away. Alpha Antenna is amazing and their customer service is off the charts! Thank you Alpha Antenna.
I ordered both senior and junior j pole antennas
Good quality and easy to install, extremely robust baln design. Extremely weatherproofz.
Talked to the owner once or twice with some technical questions, the customer service was excellent, would purchase from them again without hesitation.
Great antenna for limited space!
Works great and tunes up nice with the internal tuner of my Yaesu 991A.