13cm 2.4 GHz Antennas

Homebrew 2.4 GHz (2403 MHz) Bi-Quad antenna for SOTA

2.4 GHz Bi-Quad Antenna

2.4 GHz Bi-Quad Antenna final stages of completion

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Mount McDonald

20el 2.4 GHz DL6WU Yagi

Balun impedance transformer – 43 mm length of RG402

20el 13cm DL6WU Yagi

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The Peak VK2/SM-068 near Nimmitabel

WA5VJB 2.4 GHz 5el PCB Yagi

Big Wheel Antenna

SG-Lab supplied 2.3 GHz HB9CV 4el Yagi – note the antenna resonant frequency is 2.3 GHz not 2.4 GHz.  The VK band plan SSB call frequency is 2403.150 MHz.  I adjusted the resonant frequency by trimming the active element track lengths.

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2.3 GHz HB9CV 4el Yagi

Light coat of PCB enamel applied to the board and tracks.  Track lengths trimmed to bring the resonant frequency to 2.4 GHz.

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For resonance at 2.4 GHz, I trimmed 2mm off each side of the active elements.   The parasitic directors are untouched.

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50 mm RG402 extension to prevent capacitive reactance between the PCB antenna and transverter metal case

Published: 18 February 2018
Last Update: 19 February 2019

Recent Posts

SOTA VK1AD – April 2021 2m – 23cm activations

The purpose of this post is to share information with fellow radio amateurs, which demonstrates how you can achieve VHF-UHF Dx contacts with as little as 5 watts output on 144.200 MHz and 2.5 watts to 25 watts output on 1296.150 MHz.

Yes, you can also qualify a SOTA peak with a mono or dual band HT on 2m and 70cm. You can achieve greater distances with the use of an external antenna such as the 2m 4 element Yagi

This month’s activations include:

  • Mount Perisher VK2/SM-007
  • The Peak (Hudsons Peak) VK2/SM-068
  • Mount Taylor VK1/AC-037

1 April 2021 – Mount Perisher VK2/SM-007 QF43EO 2054 m ASL

Longest paths

  • 2m 144.2 MHz SSB VK3BJM 366 km near Kyneton in Victoria (VK3)
  • 23cm 1296 MHz SSB VK2DO 182 km, NSW South Coast

2m 144.2 MHz QSOs

2 April 2021 – VK1AD SOTA activation of Mount Perisher on 2m 144.2 MHz – Image courtesy of SOTA MAPS

23cm 1296.150 MHz QSOs

2 April 2021 – VK1AD SOTA activation of Mount Perisher on 23cm 1296.150 MHz – Image courtesy of SOTA MAPS

Extract – VK1AD SOTA activator log Mt Perisher 2 April 2021

Summit to Summit QSOs 2m and 23cm: VK1RX at Mt Ainslie VK1/AC-040 144 km and VK1FLEX at Mt Kosciuszko VK2/SM-001 12km, Australia’s highest mainland peak

TimeCallsignBandModeNotes
23:33VK2TWR2mSSBQF43PL Rod s59 r59
23:34VK1MA2mSSBQF44MT Matt s58 r55
23:36VK2NSS2mSSBSteve s55 r52
23:37VK1DSH2mSSBQF44MS Dale s52 r52
23:38VK1AT/32mSSBQF32UC Jim s52 r51 175 km
23:41VK1JA2mSSBQF44NO Jason s58 r58
23:42VK2COW2mSSBQF44OX Dimitris s58 r57
23:43VK2DO2mSSBQF54CH Chris s58 r59
23:47VK3BJM2mSSBQF22ES Barry s52 r41 366 km
23:50VK1RX/P2mSSBAl s59 r59 S2S VK1/AC-040
23:57VK1KW2mSSBQF44MT Rob s59 r59
00:00VK2TWR23cmSSBQF43PL Rod s59 r59 82 km
00:02VK2DO23cmSSBQF54CH Chris s57 r57 182 km
00:05VK1DSH23cmSSBQF44MS Dale s51 r51 143 km
00:06VK1KW23cmSSBQF44MT Rob s59 r59 147 km
00:07VK1RX/P23cmSSBQF44NR Al s51 r51 S2S VK1/AC-040 144 km
00:09VK1JA23cmSSBQF44NO Jason s58 r58
00:39VK1MA2mSSBMatt s58 r55
00:40VK1MIC2mSSBWade s51 r51
00:42VK1FLEX/P2mSSBDrew s59 r59 S2S VK2/SM-001 12 km
00:54VK1FLEX/P2mSSBDrew s59 r59 S2S VK1/SM-001 (VK1NAM)

2 April 2021 – Hudsons Peak (The Peak) VK2/SM-068 QF43NN 1230 m ASL

Longest paths

  • 2m 144.2 MHz SSB VK1KW 140 km, Canberra
  • 23cm 1296.150 MHz SSB VK1MA 140 km, Canberra

2m 144.2 MHz and 23cm 1296.150 MHz QSOs

2 April 2021 – VK1AD SOTA activation of The Peak on 2m and 23cm – Image courtesy of SOTA MAPS

Extract – VK1AD SOTA activator log The Peak 2 April 2021

TimeCallsignBandModeNotes
04:45VK1MA2mSSBQF44MT Matt s51 r51
04:45VK2TWR2mSSBQF43PL Rod s59 r59
04:47VK1MIC2mSSBQF44NT Wade s51 r51
04:49VK1KW2mSSBQF44MT Rob s59 r59
04:52VK2TWR23cmSSBQF43PL Rod s59 r59
04:55VK1MA23cmSSBQF44MT Matt s41 r41
05:06VK2UK23cmSSBQF44MT Matt s41 r41
05:07VK8GMT/123cmSSBQF44MT Matt s41 r41
05:09VK1RX23cmSSBQF44NN Al s52 r51
05:20VK2DO23cmSSBQF54CH Chris s57 r57
05:41VK3TST/440mSSBMarcus s54 r54 S2S VK4/SE-117
05:43VK2DO2mSSBQF54CH Chris s59 r59

1 April 2021 – Mount Taylor VK1/AC-037 QF43MP 850 m ASL

Longest paths

  • 2m 144.2 MHz SSB VK2EMA 382 km at Tottenham NSW (VK2)
  • 23cm 1296.150 MHz SSB VK1MA 60 km, near Yass NSW

2m 144.2 and 23cm 1296.150 MHz QSOs

18 April 2021 – VK1AD SOTA activation of Mount Taylor on 2m and 23cm bands to local stations – Image courtesy of SOTA MAPS
18 April 2021 – VK1AD SOTA activation of Mount Taylor to 2m DX stations – Image courtesy of SOTA MAPS

Extract – VK1AD SOTA activator log Mt Taylor 18 April 2021

Summit to Summit QSOs – VK1DA/2 at Mt Canobolas VK2/CT-001 225 km and VK1MA at Mt Mundoonen VK2/ST-053 60 km.

TimeCallsignBandModeNotes
02:54VK1MCW2mSSBQF44NN Bill s59 r59
02:59VK1MIC2mSSBQF44NT Wade s58 r59
03:01VK1DO2mSSBQF44PO Chris s59 r59
03:04VK1DO23cmSSBQF44PO Chris s59 r59
03:06VK1MA/P23cmSSBQF45ME Matt s59 r59 S2S VK2/ST-053
03:14VK1MA/P2mSSBMatt s59 r59 S2S VK2/ST-053
03:19VK2COW2mSSBQF44OX Dimitris s59 r59
03:26VK1DA/P2mSSBAndrew s55 r55 S2S VK2/CT-001
03:52VK1KW23cmSSBQF44MT Rob s59 r59
03:54VK1JA23cmSSBQF44ON Jason s59 r59
04:26VK2EMA2mSSBMark s55 r52
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