Delta Loop for the 20m band

A delta loop antenna is not particularly suitable for SOTA. It requires much more space than a vertical and the set-up is more complicated.
Nevertheless I’d like to show this design here because sometimes space (and weight) don’t matter and a low take off angle is welcome. One possible scenario could be the VK/ZL/JA <> EU S2S event.

loop1
Delta Loop on HB0/Li-004, Augstenberg, 2359m a.s.l. during our DX-pedition to the Principality of Liechtenstein in September 2013. DL4AAE worked many JA’s on 20m with 100 Watts output power.  Note: the horizontal wire has been attached to the pole in order to avoid sagging.

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EFHW- Dipole with Traps

While searching for an alternative to my Linked- Dipole I tripped over the posting of Pedro, CT1DBS, illustrating an end-fed half-wave (EFHW)- Dipole with Traps. Here is the Link to his article. With this design changing bands can be done in no time thaks to the traps. Lowering or modifying the antenna is no longer necessary.

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SOTA Equipment – updated

This is what my equipment looks like after I started a programme to reduce the weight (s. the 2 kg Challenge). I’m going to use it on long hikes and trips to high summits where weight comes into play.

sota-light

From left to right: EFHW- Dipole with traps (40m, 30m, 20 m), 10m Nylon rope (red), tent peg, antenna bag, Unun 1:64, 1m RG58, bag for MTR 3B and Palm Pico Paddle, earplugs,  1250mAh LiPo battery 2S, power cable with fuse, 3 velcro straps, lashing belt, tape, writing board with log sheets, pencil, spare fuse, headlight, 3 x 10m guy rope with tent pegs, support plate 8mm (for guy wires), army knife,  6m fiberglass telescopic pole (57cm long).

The equipment as shown in the picture weighs 2067 grams. However, it is possible to leave the guy ropes out and attach the GRF pole to the summit cross using the lashing belt. Additionally, if a 1000mAh LiPo will be used instead of the 1250mAh LiPo, the total weight of my equipment is slightly above 1700 grams. This is 3 kg less than what I’m usually carrying around and definitely a big improvement.

SOTA Equipment

Used for trips to the local summits.

From left to right: Folding stool, 2200mAh LiPo battery in a ’safe bag‘, throw bag (250g), 30m Nylon rope (3mm) , 2 x 10m Nylon rope (3mm) with tent pegs, KX3 with Palm Pico Paddle (on the KX3-Go-Box), 40m- and 30m- wire-dipole (w/o BALUN), 20m end-fed dipole, plywood board (serves as table), headlight, tape, writing board with log sheet, pencil, KX3 power cable with Power Pole plug, headphones, angle adapter BNC – UHF, Army knife, RG223 (20m), velcro straps, 3 x 10m guy rope with tent pegs, 10m fiberglass telescopic pole (67cm long), support plate 22mm (black, for guy wires), support plate 8mm with pulley block (blue, for antenna), 2 lashing belts.

SOTA_equipment

As the trips are usually not tiring I don’t optimize the weight of the equipment more than necessary. I prefer a minimum of comfort (folding stool and plywood board) and the choice between several antennas and options to set them up: In a tree with throw bag and rope or on the fiberglass pole which can either be attached to a fence post or secured with guy- ropes.
The monoband antennas have been replaced with a linked dipole in the meantime. However, a further optimized antenna (End Fed Half Wave Dipole with Traps) is already under construction.