End of an Era CH5A Aerials Bite the dust

VK3ZAZ · Post by **VK3ZAZ** » Wed Mar 26, 2014 11:01 am

First panel ex HILLS TV

SBA8 H TXP 5A

x 12 on three tower faces

11.5dbd

VK3ZAZ · Post by **VK3ZAZ** » Wed Mar 26, 2014 1:20 pm

150 metres plus

Free to a good home

VK3ZAZ · Post by **VK3ZAZ** » Thu Mar 27, 2014 9:23 am

Another day another Bay

Looming out of the mist on the 500 foot winch cable.

Antenna bay number 5

4 riggers up in that pea souper

They earn $600 per day

VK3ALB · Post by **VK3ALB** » Thu Mar 27, 2014 9:34 am

I'm surprised they are bothering to reclaim the aerials. Are they making room on the tower or taking them for scrap?

VK4TIM · Post by **VK4TIM** » Thu Mar 27, 2014 11:04 am

They would likely make VERY good 2m antennas, and positioned vertically, they would work very well for 2m repeaters.
There's two sites in ZL that use large arrays based on this design for 2m repeaters. Drive it with 100W and it works very well.

What is the outlook for these antennas? Scrap yard or available for Amateurs?

VK3ZAZ · Post by **VK3ZAZ** » Thu Mar 27, 2014 12:24 pm

VK4TIM wrote:They would likely make VERY good 2m antennas, and positioned vertically, they would work very well for 2m repeaters.
There's two sites in ZL that use large arrays based on this design for 2m repeaters. Drive it with 100W and it works very well.

What is the outlook for these antennas? Scrap yard or available for Amateurs?

Already at Boundary Metals Hamilton

scrapped

VK3ZAZ · Post by **VK3ZAZ** » Thu Mar 27, 2014 12:27 pm

Going

I doubt if they would work at 146 MHZ

137-144 with cut off

VK3ZAZ · Post by **VK3ZAZ** » Thu Mar 27, 2014 12:29 pm

VK3ALB wrote:I'm surprised they are bothering to reclaim the aerials. Are they making room on the tower or taking them for scrap?

NBN Rollout want the tower space and need to de-stress the tower of some 500KG in weight.

Feel free to call Boundary metals Hamilton, each antenna on its frame weighs in at 60KG and is 2Mx4M frame

VK3ZAZ · Post by **VK3ZAZ** » Thu Mar 27, 2014 12:37 pm

I am just looking at the antenna plot
return loss was -40db
137.250 to 143.00 MHZ
1983 design
1.05:1 at 143.750
1.1 at 144.00 and escalating
h plane 20 degrees
e plane 40 degrees

They tuned them by spacing between parallel s/s bars
and a tune stub inside the baluns

They are on a BACK PANE reflector so are directional cardiod pattern prob would not work without the back pane

DIAMETER 10CM
Overall 1.4M
Each dipole 0.64M
phasing is 1/2 s/s rod
stainless steel

backpane is 4.14M x 1.81m
dual balun stacked dipoles
2.2m stacking c/c
0 degrees
-60
to
-147
over 4 levels
7.2kw input radiated 100kw
I bay had 90 degree stub in it

each panel of 4 11.5dbd
147m agl

VK3ZAZ · Post by **VK3ZAZ** » Wed Apr 02, 2014 10:22 am

Simms metal happy
we delivered over 500KG of brass and copper and 500KG of stainless steel and 500kg of 3.5 inch feeders (250metres)
No antenna no feeders nil nothing.

When we cut the feeders 10 litres of water ran out.

5A is just a shell of a transmitter all PAs donated to hams NOT SOLD
12 500w s/s pas out there in ham land somewhere'.

SO amongst my midemeanors

OT has scrapped CHANNEL 5A

Enjoy 2M QRM free

VK5BJE · Post by **VK5BJE** » Wed Apr 02, 2014 2:05 pm

Hi Steve
While the dismantling was occurring what happened to the other signals from the tower? Were services shut down, reduced in power or what? Thanks for the post: a great story about the end of an era.
Thanks

John
VK5BJE

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End of an Era CH5A Aerials Bite the dust

End of an Era CH5A Aerials Bite the dust

Going Going

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Re: End of an Era CH5A Aerials Bite the dust

1 panel to go

Re: End of an Era CH5A Aerials Bite the dust

Re: End of an Era CH5A Aerials Bite the dust

GONE

Re: End of an Era CH5A Aerials Bite the dust