Hi Glen

Does your modelling take account of the potential absorption of RF due to the increased density of vegitation following the 2003 fires?

At Kangaroo Creek I used a 3el yagi pointing at an exposed rock cluster on the south-east face of Billy Billy range around 1400 metres ASL. At 50 watts output I hit the Isaacs repeater but only in the horizontal plane. I had little to no reception in the vertical plane.

The reflections off the rock face may have caused a polarisation change from vertical to horizontal, assuming the WICEN repeater antenna is vertical.

Regards

Andrew, VK1NAM web: http://vk1nam.wordpress.com sent from phone On 27/10/2014 10:22 AM, "Glen English" glen@pacificmedia.com.au wrote:

Fitz challenge difficult profiles ..... if you were at these, you had your work cut out :-) However- I think that the difficulty scale it was probably one point too high for you guys given the short setup time you all had.

And that is the pursuit of the hobby- to learn, experience, understand...... If we give everyone full scale signals, then nobody learns anything. Nobody learns to copy weak signals, ensure their antennas works, understand propagation variabilities, understands how to pick a signal behaviour based on the terrain around them.. etc.

It's surprising what you can do with 15W (the power at repeater antenna) . Yes, 15W ! 75W next time. Why does it work with 15W? - because the repeater, on the left, has a very good takeoff.

Issacs- Rendezvous Creek (more difficult due to the proximity of the immediate obstruction)

Issacs - Corin Forest

Issacs- Kangaroo Creek (corin dam)

issacs - Honeysuckle tracking stn

issacs - Orroral TS.

This is more difficult :

Mt Tennant to Kangaroo Creek

-- Glen English RF Communications and Electronics Engineer

CORTEX RF & Pacific Media Technologies Pty Ltd

ABN 40 075 532 008

PO Box 5231 Lyneham ACT 2602, Australia. au mobile : +61 (0)418 975077