Hohloh – DM/BW-054 – 984m

Abstract

December 18, 2020  11:40 – 13:50 UTC
My first activation of Hohloh (after I had to cancel it in September due to a blocked road).

Wx: Sunny, approx. 6°C, no clouds
Walking time: 20 min. up, 20 min. down
Ascent/ descent: approx. 100 vertical metres

Rig: KX3 / 10W,  2.5 Ah Li-Ion battery (4S), Palm Mini Paddle
Ant: Trapped EFHW-dipole as inverted L on a 6m squid pole.

Excellent condx on all bands. SFI = 82, k = 1.

14 CW QSOs on 60m, 1 x S2S
50 CW QSOs on 40m, 1 x S2S
16 CW QSOs on 30m, 1 x NA
24 CW QSOs on 20m, 1 x S2S, 3 x NA, 1 x OC

Highlights:
– 104 QSOs in 130 minutes – an all time record!
– First SOTA-QSO with ZL
– Re-deisgned EFHW-transformer with the smaller T82-43 toroid works excellent.

Lowlights:
– An IK2-chaser calling non-stop without ever being able to copy my signal

Weiterlesen

5 to 28 MHz Random wire antenna – 12.8m (42 ft)

Some time ago I had a S2S-QSO with N1ZF. In the following e-mail contact we exchanged information and photos about the antennas used for this QSO.
This is when I became aware of the „Random Wire Antenna“ that Paul had successfully used. It consists of a 12.8 metre long wire as radiating element and an equally long ground radial. Matching is done with the KX3’s internal ATU. Since the ATU cannot match any impedance, it is important to choose a wire length that is not a multiple of half a wavelength. This way the „odd“ length of 12.8 meters emerges.

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Delta Loop for the 40 metre band

A delta loop antenna – especially for the 40 metre band – is not exactly suitable for SOTA. It is huge and requires a lot of space. Furthermore the set up is time-consuming.
Nevertheless I’d like to show this design here because:

  • During sunspot minimum 40 m still offers the opportunity to work a lot of DX.
  • The delta loop provides the required take off angle to work the DX.
  • Sometimes space (and time) don’t matter.
  • It’s fun building it 😉

A possible application could be intercontinental S2S events.

loop1
Delta loop on HB0/Li-004, Augstenberg, 2359m a.s.l.

Here is the Link to the 20 metre version of the delta loop.
During our DX-pedition (Link) to the Principality of Liechtenstein in Sept. 2013. DL4AAE worked hundreds of JA’s on 20 metres with this antenna and 100 W output power.

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QRP L- tuner for 5 MHz … 28 MHz

Recently I came across an article from Andrew, VK1AD, in which he describes a QRP L- tuner for 3.5 MHz to 52 MHz. It can be found here.
Andrew’s article is based on an essay by Peter, VK3YE, published in VK’s Amateur Radio magazine, Edition 5, May 2017.
I really wanted to try this easy to build L- tuner, because I thought it might perform even better than my EFHW- transformers (UnUns) and the EFHW- dipole I’m currently using for my SOTA activations.

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