Bandspringer Midi HF Longwire Antenna System , 10m-60m

Video: Bandspringer Midi

At a glance

• Bands 10, 12, 15, 17, 20, 30, 40, 60m   with most tuners that are capable of tuning a random wire / long wire antenna (see details below)
  

• Power rating 125 Watts

• ATU needed? Yes

• SSB, CW, data? Yes. Fine for all modes

Details:

A great antenna for operators who like to travel fast and light; the new Bandspringer weighs in at just 190g (6 1/2 Oz). It's the ideal antenna to use with a KX3 or KX2 which have an internal antenna tuner.

The current generation of HF portable radios offer great performance on the HF bands—but to get the best out of them, an efficient antenna is required. The Bandspringer is a multi-band long-wire antenna. The length has been carefully chosen to ensure that it will work with the internal antenna tuners in portable radios such as the K1*, KX1, KX2, KX3 and K2. It will also work well with LDG tuners and the Elecraft T1. Note that the Bandspringer must be used with an antenna tuner - it is fine for use with an FT817 or similar radio, as long as you have a suitable antenna tuner connected between the Bandspringer and radio.

Note that for some radios with an internal antenna tuner, the internal tuner might not have a large enough matching range to match the Bandspringer, so you would need to add a suitable external tuner.

Suitable tuners will usually be advertised as being able to tune a random wire / long wire antenna. Some tuners state in the small print that additional equipment is required for this, please check your tuner manual for details. For example, it might say "Optional external Balun allows tuning of random length, long wire or ladder line fed antennas", indicating that the tuner is likely to need a 4:1 balun connected between it and the Bandspringer.

The exact range of bands may vary depending on your tuner. The Bandspringer Midi should work on 40m, 30m and 20m with any tuner capable of tuning a random wire / long wire antenna. It will work effectively on all bands from 60-10m with most such tuners, but not necessarily all.

If you want to support your Bandspringer on a pole, then any pole between 5m and 7m should be fine. Longer poles can be used by extending the nylon cord at the far end of the antenna.

How does it work?

The length is selected to give a moderate impedance at the end for easy matching. It is also designed to ensure that the current section (where much of the useful radiation comes from) is sufficiently elevated. This is the antenna that Richard (G3CWI) used on most of his SOTA activations to become the first activator to complete England, Wales and The Isle of Man.

You can read about the background to this type of antenna here:
https://www.hamuniverse.com/randomwireantennalengths.html
https://udel.edu/~mm/ham/randomWire/

NOTE: the antenna must always be connected directly to your tuner - not via a co-axial cable.

What do you get?

The Bandspringer Midi consists of two wire elements, both are made of high quality stranded wire, insulated with a yellow pvc. This wire type has proved a good compromise between flexibility and performance. The yellow insulating jacket makes it easy to spot on most surfaces which makes handling much easier. The elements for the Bandspringer Midi II version are approximately 42 ft (12.8 m). One element is the radiator the other acts as a counterpoise.

The wire elements are supplied wound on a Wirewinder to make deployment and recovery in the field as easy as possible. The radiating element has a braided nylon cord extension to make it easy to use. The extension is firmly attached to the wire at one end and has a pegging loop at the other end.

Each element is terminated in a good quality 4mm “banana plug".

The Bandspringer is also supplied with:

• nylon carry bag

• three insulators that can be used to attach the antenna to a pole and to our own pegs (supplied attached)

• three cable ties - to give more attachment options

• two aluminium pegs

• one 4mm to BNC Adapter

Note that the colour of the Wire Winders and bag may vary from the picture.

Instructions are available HERE!

Also available from our international agent(s):