JPC-12 High-End Version 7MHz-50MHz 100W Portable Shortwave Antenna Balcony Outdoor Shortwave Antenna

JPC-12 High-End Version 7MHz-50MHz 100W Portable Shortwave Antenna Balcony Outdoor Shortwave Antenna

Description:
The JPC-12 portable shortwave antenna can be used as a field or balcony-mounted antenna. It is a mini portable antenna specifically designed for outdoor communication. Easy and quick to set up, it can be assembled by one person in just five minutes.

Features:
Loading Coil with Sliding Tuner
* We have once again optimized the loading coil. On top of the original single spring contact, we added an extra one to increase the contact force, making the connection between the contact and the coil more reliable. The new version of the antenna replaces the adjustment screw and plug used on the original JPC-7 and PAC-12 with a sliding tuner, making SWR adjustment simple and effortless—just slide the tuning block gently with your finger.

Aluminum Alloy Base
* Anodized black finish

Oxidized Aluminum Tubes
* Dimensions: 19×320 mm (anodized and sandblasted finish)

10-Strand Flat Cable for Counterpoise
* Tear off as needed during use; typically, three strands are sufficient.

Ground Anchor
* Dimensions: 10×240 mm (no electroplating treatment, to maintain good grounding)

Telescopic Antenna
* Custom 2.5-meter stainless steel telescopic antenna

Dedicated Cloth Bag
* The internal compartments are well-organized for convenient storage. Durable and sturdy.

Antenna Performance Specifications:
* Carrying Weight: Approximately 1.4 kg
* Collapsed Length: About 34.5 cm
* Deployed Length: About 410 cm
* Frequency Range: Operates on 40m, 30m, 20m, 17m, 15m, 12m, 10m, and 6m bands (7 MHz – 50 MHz)
* Impedance: 50Ω
* Power Handling: 100W
* SWR (Standing Wave Ratio): Less than 1.3 on the 40m band; Tunable to 1.1 on other bands

Sliding Tuner Reference Data:
7 MHz:
* Position: 4 turns near the aluminum tube side
* Telescopic rod: Retract approximately 10 cm
* SWR: 1.1–1.3

14 MHz:
* Position: 6 turns near the telescopic antenna side
* Telescopic rod: Retract approximately 20 cm
* SWR: 1.1–1.3

21.4 MHz:
* Configuration: Use 4 aluminum tube sections + 7 sections of telescopic antenna, extended approximately 10 cm further
* SWR: 1.1–1.3

29.6 MHz:
* Configuration: Use only the telescopic antenna, fully extended, then retracted by about half a section
* SWR: 1.2

Note:
* The above parameters may vary slightly depending on the environment. You can make minor adjustments based on your actual operating conditions.
* The antenna does not include the JPC-7 base, clamps, adapters, feeder line, antenna base, or loading coil for balcony installation.

Precautions:
* This listing does not include the feed line.
* Place the counterpoise ring directly onto the ground anchor's screw rod and tighten it to the base. Then assemble in the following order: Connector Base → 4 Aluminum Tubes → Loading Coil → Telescopic Antenna.
* SWR Tuning: 1. If you have an antenna analyzer: First, locate the point with the lowest SWR and check whether the resonant frequency is too high or too low. If the resonant frequency is too high, the antenna is too short — extend the telescopic antenna or increase the number of turns on the loading coil. If the resonant frequency is too low, the antenna is too long — shorten the telescopic antenna or reduce the number of coil turns. 2. If you don't have an antenna analyzer: Use the built-in SWR meter on your transceiver. Set the radio to FM, AM, or RTTY mode, lower the output power to about 10 watts, press the transmit button, and adjust the radio's tuning knob to find the point with the lowest SWR. Then follow the same method above to fine-tune the antenna.
* When using the counterpoise, tearing off 3 to 4 strands is sufficient. Adjusting the angle of the counterpoise can change the antenna's impedance.

Packing List:
* 1 x Aluminum Alloy Base
* 1 x Loading Coil with Sliding Tuner
* 1 x 10-strand Flat Cable for Counterpoise
* 1 x Ground Anchor
* 1 x Telescopic Antenna
* 4 x Aluminum Tubes
* 1 x User Manual
* 1 x Storage Bag