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VK4DW Australia flag Australia

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G'day from VK4DW in the "Land Dowunder"

Above is a photo of my wife Sue and myself in Seattle Washington USA. 

I live in Mackay. North Queensland, Australia, which is a small city of around 110,000 population http://www.mackayregion.com/ Mackay is 970 kilometres north of Brisbane, which is the state capital, so we are part of North Queensland.

The photo below shows one of my Amateur Repeaters.

The Black Mountain Repeater Facility, that houses my 70cm UHF Repeater (VK4RBY)

* (note: In Australia, Ham Repeaters are licenced under their own callsign [which always prefix with"R"] 



Licence details with the ACMA. (Australian Communications and Media Authority)http://web.acma.gov.au/pls/radcom/licence_search.licence_lookup?pSOURCE=HELM&pLICENCE_NO=1184509/1

This site is about 1000 ft elevation and gives good local and hinterland radio coverage, of the Mackay area

The 25 watt Repeater is a "True Ham Creation". It is made from 70's vintage Philips Model FM828 mobile two way radio bits and pieces. The 828 is a very robust radio and has some very good base station features. The receiver uses a very selective helical filter front end, making it very good in the repeater environment. Sensitivity has been improved with the addition of a "Advandced Receiver Research" low noise pre amp.�http://www.advancedreceiver.com/page5.html

The transmitter uses a 50 watt MRF646 final transistor running at 25 watts, which makes it very reliable. (Still putting out 25 watts after many years of service)

All mounted in a 1RU rackmount box. Home made brass boxes to house both TX and RX. (Metalwork skills not the best) However, it works!

The repeater controller is a VK5DJ pic based device that is simple and very easy to build and make work. �http://www.vk5dj.com/repeater.html

At the Black Mountain Site, we have grid power (240vac) and I have a battery back up system installed that has never let me down in over 7 years. The rack that the repeater is installed in has 13.8vdc wiring via a Circuit Breaker Panel, mounted at the top of the rack.

At the home QTH.

A "Raspberry PI" Linux board is used to connect to the internet, and the standard IRLP radio interface board.�

This is mounted on the wall of my shack. I call it "Wall Art"!  

It is all powered by Solar Powered DC. The internet is connected to the shack via a Samsung 2.4GHz link that is mounted on the wall of the shack. The Samsung Link runs from 5vdc of a little DC/DC converter board, connected to the 13.8vdc solar power. The Rasperry Pi computer runs from this as well.

The IRLP Interface Board connected to the Rpi Computer is connected to a Motorola GM950 UHF Transciever running 1 watt into an 8 element yagi, pointing to the Black Mountain Site.

The other end of the 2.4GHz link is also a Samsung unit that is connected to the ADSL internet connection in my home.

I am also active on Dstar through a number of repeaters in the Mackay area, and also my DV Mega, which I use when mobile. I use an ID-51A handheld, and ID-5100, ID-4100, and an IC7100. I monitor the Queensland DCS028Q reflector most times.

I also monitor DMR Queensland and Australian Groups on my Mortorola DM3401 in the shack. P25 as well 

73 de VK4DW

8140701 Last modified: 2017-06-06 01:41:11, 4133 bytes

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