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10-160M 60ft end fed HF Sr

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$219.00

MODEL: JPole_Sr

60-foot long 10-160 Meter HF antenna.

User Manuals – Alpha Antenna

The Alpha End Fed Sr is a 10-160 meter HF End Fed antenna that is 60 feet in length, which is nicknamed the JPole Jr due to its 2 parallel elements. Use a tuner to achieve a near perfect SWR on these bands, with limited efficiency on 160 meters.

Specifications

  • Weight: 1 pound
  • Configuration: End-fed antenna configurable as Sloped or Horizontal
  • Frequency Coverage: 1.8-29.7 MHz (160-10 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.
  • Length: 60 Feet
  • Connector: UHF type SO-239

Analysis

HF JPole Sr antenna SWR Analysis

60 Foot element
Band SWR
10 Meters 1.61
12 Meters 2.43
15 Meters 1.75
17 Meters 1.52
20 Meters 2.20
40 Meters 2.67
80 Meters 2.08

Deployment Recommendations

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.

WA7KJ Customer Photo

EFHW Dipole Antenna deployed

Purchase A Replacement Match

We are dedicated to improving all of our antennas. Specifications and descriptions are subject to change without notice.

5.0
Based on 61 reviews
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1-5 of 61 reviews
  1. JS

    It’s an excellent antenna. I will use it at field day and pota. Wish that I could use it at my home. My mistake. I need the shorter one th fit in my townhouse property.
    Thanks for a great product.

  2. GW
  3. R
  4. PH

    I can tune the antenna from 160m to 10m so it does what it says it will do. Also works well on UK 5 MHz allocation. Well made and prompt delivery to UK.

  5. MC

    Great signal to noise ratio compared to other wire antennas

Weight 80 oz
Dimensions 12 × 9 × 5 in
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Q & A

Does this antenna need a support rope? Paul R. asked on April 18, 2024

Yes. Please see the manual for rope use here https://www.alphaantenna.com/manuals/JPole_Sr_v2.9_by_Alpha_Antenna.pdf

admin answered on April 24, 2024 store manager
(0) (0)
Should a BalUn or air choke be installed? Q A asked on December 28, 2023

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/

admin answered on December 28, 2023 store manager
(0) (0)
How high should this antenna be installed? Q A asked on December 28, 2023

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.

admin answered on December 28, 2023 store manager
(0) (0)
How did you build this antenna to achieve such low SWR’s? Q A asked on December 14, 2023

Previous design: In July 2023 Alpha Antenna changed what was their 5:1 UnUn with a single element as the radiator and one element as the counterpoise.

Current design: The result of this change is an end fed fan dipole arrangement fed to a modified 5 to 1 UnUn.

What changed?: While monitoring with both RigExert and AIM analyzers, physical changes were made in real-time to the inductor with the new configuration of the two wire elements attached. Those analyzers simultaneously monitored all of the bands, while physical changes were made to the inductor. We stopped making changes once the best values were presented. During this process, we found that the shorter leg of the two wire elements also had to be modified to present excellent results. The value of the new UnUn has not been tested, nor do we care to test it, we simply enjoy the results of a finely tuned system.

Comments: To construct the UNUN, specialized tools were built on our 3-D printers. Without these tools, construction of the new UnUn in a production environment was nearly impossible. Fortunately, we use Fusion 360, which made designing the tools possible.

admin answered on December 14, 2023 store manager
(0) (0)
Regarding the 2 parallel elements that for the shape of a ‘J’; Is the 2nd wire a transmitting element like a dipole or is the 2nd element a counterpoise, and are both wires strung along the same axis or is the 2nd one sloped down beneath the 1st one at a steeper angle? Q A asked on December 8, 2023

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.

admin answered on December 8, 2023 store manager
(0) (0)

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