VK2KFJ's Weak Signal DXing Information.

Created on 14th April, 2005.

last updated 7th July, 2006.

This is information and links to other sites, useful to weak signal DXers, ie. usually 6 metre and upwards, using modes
like SSB, CW, and narrow digital modes such as WSJT, PSK31, JT44, etc. using equipment that is generally high powered, with large
antenna arrays, to work distant stations, under various modes of propagation, eg. tropo, E's, TEP and ducting

The majority of my weak-signal DXing was done on 2 metre SSB from my home previously at Beacon Hill, on the northern
beaches area of Sydney, where I lived in a 2 storey house, on a hill, with clear view to the north coast of NSW,
but shielded to the south, which in itself had its pros & cons, the pros were it provided shielding of RF noise
to the city, but the cons were it was very difficult to work DX to the south, ie. southern NSW and Victoria (VK3)
I also did a bit of 6metre and 70cm SSB DXing, but this was only during field day trips to mountain tops, inconjunction
with VHF/UHF contests, such as John Moyle Field Day and Ross Hull VHF/UHF contests

After moving house in 1987, I had the 2m yagi antenna, setup for about a year or two before removing it, to do house
extensions, then I was unfortunately forced to sell my 2metre and 6metre all mode transceivers, so that put the DXing
on hold since then.
May, 2006 now have a FT-221, have fixed it up, interfaced it with a Tono 130w amp, bought a roll of new LMR-400 coax, slowly getting
my station running again, working on it over winter, hopefully fully operational by October ready for spring and summer activity.

Some useful links, that may aid you in working weak signal DX:

DX Clusters, Propagation Loggers, etc:

  • VK4CP's VK/ZL VHF-UHF & HF Propagation Logger & DX reporting - the local VK & ZL DX logger & discussion forum.
  • OH2AQ's DX-Summit DX cluster.HF, VHF, UHF everything, including specific modes.
  • DXworld 50 Mhz Propagation Logger. (includes access to UHF, digital, packet, TV/FM loggers)
  • DXworld 144 Mhz Propagation Logger. (predominantly USA activity)
  • DXworld UHF Activity Logger - 70cm and upwards. (predominantly USA activity)
  • 50 MHz DX Web Cluster from JAPAN. (includes access to HF, EME, satellite clusters)
  • VHF/UHF DX Web Cluster from JAPAN. (includes access to HF, EME, satellite clusters)

    Other utilities and information sources:

  • VK2KFJ's TEP - Transequatorial Propagation page.
  • Leigh VK2KRR's VHF/UHF DXing, including FM & repeater DXing.
  • NSW VHF DX Group. ( start here if you wish to get into some serious VHF/UHF weak signal DXing. )
  • NSW VHF DX Group. vk-vhf mailing list details. This is the new address for 2006
  • VK VHF FM DX Group. ( if you wish to start of with some FM DXing )
  • William Hepburn's VHF-UHF Tropospheric Prediction Service for VK & ZL region
  • SWARM - Solar Warming And Realtime Warning - Near-Real-Time Map of the F2-Layer Height Maximum
  • Near-Real-Time MUF (Maximum-Usable-Frequency ) Map
  • charts which show temperature inversions at altitudes below about 1500 metres, for long distance VHF/UHF propagation
  • Comparison of Solar Cycles 21, 22 & 23 from DX Listeners Club
  • NASA's site for Sunspot activity
  • DL6WU yagi design
  • Gridsquare Conversion Utility.
  • Distance Calculator Utility.
  • Weatherzone, includes satellite, radar and lightning tracking for Australia.
  • Australian Bureau of Meteorology, weather radar tracking.
  • Tony Mann and Todd Emslie's trip to Darwin to collect data regarding class2 TEP VHF DX, to Asia, Middle East, and the Pacific Islands
  • EsoftAnywhere DSP (digital signal processing) software from VE1EXE
  • Joe Taylor K1JT 's WSJT site
  • The WSJT information and download site
  • DK5YA 's WSJT page
  • DL4YHF's Audio Spectrum Analyzer ("Spectrum Lab")
  • Alberto, I2PHD and Vittorio, IK2CZL site for SPECTRAN, ARGO & HAMVIEW software
  • SM5BSZ's site for LINRAD Linux based PC software
  • G4KLX's site for LinWSJT Linux based PC softwarefor WSJT mode
  • a dissertation by Rex VK7MO on using digital modes on vhf & uhf for weak signal DXing.
  • 50 Mhz operatoring ethics, Voluntary code of Practice for 6m operators - UKSMG
  • VHF & UHF Contests schedules.
  • Australian (VK) Bandplan
  • Building a RF power meter, from DC to nearly 3 GHz, with -40 dBm to +20 dBm (at 50 ohms) dynamic range,
    true average power response (i.e. modulation independent), +/- 0.5 dB accuracy, and linear dB scaled output?
    You can now do it with a single 16-pin TSSOP chip


    Overseas Weak-Signal VHF & above groups/people

  • G7RAU's VHF pages
  • N5XU's (Uni of Texax) VHF pages, Texas, USA.
  • Mt Airy VHF group, (Pack Rats) Southampton, Pennsylvania, USA (east)
  • Pack Rats VHF links
  • North East Weak Signal VHF group, USA (north east)
  • Central States VHF group, USA
  • Rochester VHF group, USA (north east)


    Tech-Bits: Receiver Sensitivity. With a good preamp and a quiet location, you should be able to copy virtually down to the noise floor. In a 2khz bandwidth for SSB this is -141dBm, which corresponds to 0.02uV in 50 ohms. This is S1 on a scale of 6dB per S-point with S9 at 5uV. S2 at 0.04uV (-135dBm) is comfortable copy. Guy VK2KU



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