Windom 3,5-7-14-28 mk2

Product detailed description

Windom antenna (FD-4) for bands 3,5-7-14-28 MHz.

New unun design 2025

- more massive boxes, thicker walls
- brass bushings for lid screws
- Uniform box design for all models
- new power limits
- wider choice of mechanical designs
- choice of pressure valve design
- choice of Amphenol N connector
- MINI version also available in clamp mount version
- overall precision design

Suitable for use with 100 W transceiver.
Clamp mounting.

Specifications:
- Bands 3.5-7-14-28 MHz.
- arm length approx. 14+28 m, tuning by length at the mounting point
- antenna cable according to the selected variant
- unun 1:6
- power load 300 W max (SSB 300 W / CW 150 W / digi 70 W)
- weight according to selected antenna cable
- attachment for hanging
- the box has IP-65 protection
- box size 75x75x45 mm
- PL connector (UHF), on request it can be fitted with Amphenol N connector

The antenna should be supplemented with a Link Insulator, connected as close as possible to the antenna.
This avoids sheath currents and interference (RFI).

Depending on the specific mounting design, the use of an antenna tuner on some bands should be considered. The quality of the ground, surrounding objects and environment, the height of the ends of the radiator, the shape of the radiator extension (horizontal, angled, cranked, etc.) have an influence.
Optimal mounting conditions are: horizontal at least 10m high, powered by a coaxial cable of the length of the impedance repeater to the lowest band used. Impedance repeater = ½ lambda x truncation factor (for the specific cable used)

The unun box can be fitted with a pressure valve at extra cost.
Function of the pressure valve - if the instrument box is subjected to temperature changes - e.g. difference in day and night temperatures or if heat is generated in the box during operation and the box cools down after operation - pressure changes and condensation of water vapour occur in the sealed box.
In some cases, a vacuum may even be created, which can cause dust and moisture to enter.
Installing a valve with a pressure balancing function is a very simple way to provide ventilation and at the same time prevent vapour condensation and dust from entering the enclosure.
If you are interested in installing a pressure equalizing valve, add the valve offered above in the related products to your cart. The extra charge is the price of the valve.

Example of attaching the aerial cable to the mk2 balun