Projects of the Wellington VHF Group

Digital Television Tests – Bulletin No 3

Since update number 2, the quality of the prototype exciter and power amplifier, has been tested using professional test equipment.
These tests used both an unmodulated CW carrier, and a 7.6 MHz wide modulated spectrum, both centred on 506 MHz.
Both items performed better than expected and did not require any adjustment.

We are now working on getting the antenna system ready for the CW test transmissions.

Digital Television Tests – Bulletin No 2

Update number 1, as at 21st January, was published in January Q-Bit magazine, recently posted to members.

In summary, the update included a block diagram of the digital test system and discussed the various factors influencing the quality of the radiated transmission, such as the exciter quality, adjustment of the power amplifier, and the impedance matching of the output filter and antenna.

DIGITAL TELEVISION BULLETIN No 1 - RSM grants the first Digital Amateur TV (DATV) Licence.

New Zealand Radio Spectrum Management (RSM) has granted the first Digital Amateur TV Licence to NZART Branch 74, The Wellington VHF Group, for use at its main station located on Mount Belmont, in Wellington.

The main features of Licence 236831 are:

  • Digital TV Channel 25 (DTV25)
  • 502 MHz to 510 MHz
  • DVB-T format
  • 7.7 MHz emission bandwidth
  • 100 W mean effective isotropic radiated power (eirp)
  • Horizontal polarisation
  • The licence is valid for an initial period of 6 months, from 1st January 2013 to 30th June 2013.

    New APRS Digi Installed at Kaiwhara High, Ngaio

    The ZL2WA-3 digi was installed today and is running well. Coverage is designed for the central and inner suburbs, as well as the harbour area.

    The digi is being i-Gated via ZL2BEZ and traffic can be seen on APRS.FI, look for ZL2WA-3.

    A drive north showed it does not cover much north of Johnsonville on SH1 so the gap till ZL2KG takes over is still there.

    The antenna is mounted low on the shed roof, leaving the options of raising it, added directional gain or adding another digi in Tawa or maybe at Colonial Knob. Plenty of projects left to do!!

    Beacon, Digi & Repeater maps published

    Maps of the New Zealand Amateur Radio beacons, digipeaters and repeaters using Google Maps are now avaliable on the VHF Group Website at .

    The maps are available as maps embedded into this website, displayed in Googler Maps and as KMZ files that can be displayed using Google Earth or any other software that reads KMZ files. These maps contain information from the following sources: