Bushcomm Horizon End Fed 3 BAND - 10M 20M 40M
SKU Part Number: BUSH-3-BAND
This antenna is designed and manufactured in Australia and is intended to offer simple and very efficient operation on the 10, 20 and 40m metre...
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£130.00 £108.33
Availability: In stock
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This antenna is designed and manufactured in Australia and is intended to offer simple and very efficient operation on the 10, 20 and 40m metre bands. At only 12 metres in length it will easily fit into most installation scenarios. Commercial antennas are rated with a usable VSWR of 2:1 or under. Rating the Horizon End Fed using this method the band width is appropriately 100 kHz at 40m, 300 kHz at 20m and 400 kHz on the 10m band. In most cases this will be fine but if you prefer wider band width or tighter VSWR the addition of a good quality tuner will help.
 
SPECIFICATION:
10, 20 and 40m bands
200w SSB

12 metres physical length

Wire used: 1.6mm G304 grade stainless steel

Trap and balun winding: All copper

SET UP:

The antenna uses the grey balun box as it main fixing point. This can be a tower, pole, side of the house, tree etc. Stretch the main radiating element outwards and fix tight. As the wire is G304 stainless steel it can be pulled quite tight and will not stretch. This antenna is ground independent so earthing is not required.

When manufactured the antennas are hand tuned at approximately 3m (10 feet) above ground. For this reason when you install the antenna the height above ground or proximity of trees buildings sheds and so on will affect VSWR. You may have to retune for your requirements.

 
TUNING Introduction

As stated in the product introduction, band width narrows with tighter VSWR requirements. As a commercial manufacturer we rated usable VSWR figures of under 2:1. The lower the desired VSWR the narrower the perceived band width will be. For example if 2:1 is acceptable you will have a usable band width of approximately 300 kHz. If nothing over 1.2:1 is acceptable then band width will be very narrow. In this case the addition of a tuner may be desirable to avoid constant retuning.

If you approach tuning with a practical understanding of the antenna and take your time you will find it quite easy.

TUNING:

It is vital that the longer wire between the

balun and the trap (10 / 20m) bands is adjusted first as this effects the 40m band adjustment.

To re tune the first section of wire from the balun use the clamp located before the trap.

Make the wire shorter to increase

frequency and longer to lower frequency.

If there is a variance between the 10 and 20m bands try changing the angle and

height of the antenna. Also be aware any metal, buildings or trees and so forth, near the antenna, will affect tuning. Clamp off the wire and make sure any loose wire is cable tided, taped or otherwise attached to the main radiating element.

To tune the 40m band you have to alter the length of the wire after the trap. If you want to go higher in frequency the wire needs to be shorter if you need to go lower in frequency then the wire needs to be longer. When desired centre point is reached once again clamp and tie off any loose wire. 

Some general considerations.

* Use good quality UV stabilised rope or cord to secure the antenna. It will last longer and therefore is cheaper in the long term

* Generally speaking the best VSWR is easier to achieve when the antenna is installed at a ¼ wave in metres above the ground in reference to the target frequency. For example the 40m band antenna should be 10 metres above the ground, a 20m band antenna 5 metres above the ground. For this reason a multi or broadband antenna will always be a compromise. With this rule in mind, if your favourite band is 40m then try to install the antenna to favour this band.

 

* Why do we use stainless steel? We get asked this question a lot.  In truth, copper is very slightly more efficient but the trade-off is a shorter life span. Copper corrodes and stretches. Stainless does not. So while this antenna is a moderate investment in price the materials used mean it will serve you well into the future.

Shipping:

We have several shipping options for our products, including next-day and Saturday/Sunday delivery for certain items. Please see these options at checkout.

Returns:

If you have any equipment that needs to be returned to Martin Lynch & Sons, please fill out the form below:

Click here for returns form

Upon receipt of goods you have 14 days to return goods however the goods must be returned in original packaging and care must have been taken with the goods you wish to return. Under distance selling regulations you are not entitled to any refund on carriage charges or modification charges made at your request.

Warranty Terms and Conditions

Outside of the 14 faulty return period, returned items cannot be accepted, unless covered by manufacturer's warranty. We will repair as much as possible on site however in exceptional circumstances products may have to be returned to the manufacturer of distributor.

For repairs/replacements under manufacturer’s warranty for any item please download a ML&S return form from the link above and return to ML&S with the faulty product.

International Warranty information

Warranty service for items we sell is available in the U.K. only, unless otherwise noted. It is your responsibility to pay freight for returned items to the U.K. and back to you for desired warranty coverage. All of our NEW products come with a minimum 12 month warranty, (Yaesu & Icom 24 months), with up to 90 days on second-hand equipment. Items returned for service must state "returned goods for repair" on the return air waybill or U.K. import customs duties apply and will be added to your invoice. For more info about returning items please contact our customer help desk, [email protected]