Comet Antenna HFJ-350M Instruction Manual

HF-50MHz Portable Telescopic Antenna
HFJ-350M
MODEL
For : 3.5 / 7 / 10 / 14 / 18 / 21 / 24 / 28 / 50 MHz
Thank you for purchasing our products.
For your safety :
Read this manual carefully for proper handling and operation before using.
Keep this manual in a safe place for future reference.

Features

【 】
● It is a 3-division structure that is convenient to carry.
● Telescopic antenna for multi-band HF to 50 MHz band, whose frequency can be easily changed by short plug.
● Round-shape solderless Terminal for counterpoise is included. (Stranded wire: 3.5 sq [AWG12] compatible)

Specifications

【 】
Antenna type : 1/4 λ base loading type antenna
Frequency : 3.5 / 7 / 10 / 14 / 18/ 21 / 24 / 28 / 50 MHz
Max.Input Power : 75W (SSB) [3.5MHz] , 100W (SSB) [7 - 50MHz]
Impedance : 50Ω
Length : Min. 370mm , Max. 1665mm
Weight : approx. 260g (included 3.5MHz expansion coil)
Antenna Connector : M-P (PL-259)

Product configuration

Base Coil
with connector

Cautions on installation

!
To use this product, capacitive coupling with grounding or counterpoise is required.
◆
Note that if the ground capacitance is insufficient, the VSWR characteristics will deteriorate,
especially in the low frequency band, and there is a high possibility that adjustment will not be
possible.
On the structure shortened by the loading coil, the tuning band is narrow. If you want to check
◆
where the tuning frequency is, we recommend using an antenna analyzer such as CAA-500Mark II.
Make sure that the connector of the connection cable and the antenna connector are of the
◆
same type. If it is a different type, it can not be connected or it may be damaged.
This product is not suitable for mobile use. Please do not set it on the vehicle and drive.
◆
If there are other antennas or obstacles such as buildings near this antenna, this will cause
◆
SWR degradation and resonance frequency shift. In that case, please change the mounting
position of the antenna.

Handling and operation precautions

!
● When installing or removing the antenna or adjusting the element, be careful not to open your
eyes at the end of the rod.
● Do not touch the antenna during and immediately after transmission. The fever can cause burns.
● Tighten the fixing screws firmly so that there are no accidents.
● When extending the rod, always keep in mind that there are no obstacles in the height direction.
● Do not use it outdoors when it is wet, as it is not waterproof.
● Do not use when the surface is wet, and use completely dry.
Telescopic
3.5MHz
Element
Expansion coil
9-Bands
accessories
Short plug
Instruction Manual
M-P (PL-259)
Connector
Product image
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3.5 MHz expansion coil
connection & Telescopic
element shortest
】