M
Mark Harriss
Guest
I'd have trouble doing this guys job:
http://www.koreus.com/video/reparer-antenne-540m.html#
http://www.koreus.com/video/reparer-antenne-540m.html#
A
atec77
Guest
On 17/09/2010 7:33 PM, Mark Harriss wrote:
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over 40 or 50 metres anything further is academic as to the result
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M
Mark Harriss
Guest
atec77 wrote:
around ten metres at the top in a strong wind, the fact you'd be
more or less rooted after the last 100 feet climb to the top.
hmmm, static induced lightning from airflow, the fact it swings
around ten metres at the top in a strong wind, the fact you'd be
more or less rooted after the last 100 feet climb to the top.
D
dmm
Guest
On 17/09/2010 8:49 PM, Mark Harriss wrote:
the tower they were working on.
I've spoken to a few riggers who admitted that they've been thrown off
the tower they were working on.
D
dmm
Guest
On 17/09/2010 7:58 PM, atec77 wrote:
towers are located on hills and buildings.
It's not academic. There are practical reasons as to why broadcast
towers are located on hills and buildings.
A
atec77
Guest
On 17/09/2010 8:58 PM, dmm wrote:
the odds of survival are very small
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tell me the diff between falling 300 M and 50 M ?
the odds of survival are very small
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A
atec77
Guest
On 17/09/2010 8:49 PM, Mark Harriss wrote:
Last fall did my confidence though and now more than 20 metres I find
it difficult
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Coming down in base jump is pretty awsome though , and the $ is excellent
Last fall did my confidence though and now more than 20 metres I find
it difficult
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X-No-Archive: Yes
D
dmm
Guest
On 17/09/2010 9:52 PM, atec77 wrote:
Not "SH!T.. WHY THE F**K DID I LET GO?!!"
No, I was thinking "requirements".
Not "SH!T.. WHY THE F**K DID I LET GO?!!"
M
Mark Harriss
Guest
atec77 wrote:
a body can cop with. Speaking of base jumping, it would save climbing
back down the antenna again.
I understand a 2 metre fall in a harness is about the physical limit
a body can cop with. Speaking of base jumping, it would save climbing
back down the antenna again.
A
atec77
Guest
On 17/09/2010 10:17 PM, Mark Harriss wrote:
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a coil of cable 2 metres really hurts
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X-No-Archive: Yes
S
Sylvia Else
Guest
On 17/09/2010 7:33 PM, Mark Harriss wrote:
Sylvia.
At that height a parachute would be worthwhile. Shame about the weight.
Sylvia.
K
kreed
Guest
On Sep 17, 8:58 pm, dmm <dmmi...@ozemail.com.au> wrote:
velocity, so anything more is not going to make much difference to the
outcome.
For many people, even a fall from a few metres, depending on how you
land and what you land on could cause permanent injury or death.
One incident I can recall in the 1990's was when a guy (member of the
public) climbed about 1/2 way up an ABC AM radio tower some years back
in some form of protest that made it onto the regional news. Whatever
it was he wanted (wasnt a huge ask, I think it was some legitimate
dispute over a council rates notice or similar that had been ignored)
he did get, and eventually came down without incident after a day or
so up there.
The news reported that he was given aluminium foil by the negotiators
- claiming he would need to wrap it around his balls unless he wanted
to be sterile from the radiation. It was unknown whether or not they
turned the transmitter off while he was up there.
These towers were a triangular truss like structure, and a fall down
the centre of one of these would likely have you being thrown back and
forth many times between the structural members as you hit them, so
you would probably be pretty beat up before the time you reached
bottom.
From memory, anything over about 40-50 M, or so you reach terminal
velocity, so anything more is not going to make much difference to the
outcome.
For many people, even a fall from a few metres, depending on how you
land and what you land on could cause permanent injury or death.
One incident I can recall in the 1990's was when a guy (member of the
public) climbed about 1/2 way up an ABC AM radio tower some years back
in some form of protest that made it onto the regional news. Whatever
it was he wanted (wasnt a huge ask, I think it was some legitimate
dispute over a council rates notice or similar that had been ignored)
he did get, and eventually came down without incident after a day or
so up there.
The news reported that he was given aluminium foil by the negotiators
- claiming he would need to wrap it around his balls unless he wanted
to be sterile from the radiation. It was unknown whether or not they
turned the transmitter off while he was up there.
These towers were a triangular truss like structure, and a fall down
the centre of one of these would likely have you being thrown back and
forth many times between the structural members as you hit them, so
you would probably be pretty beat up before the time you reached
bottom.
M
Mark Harriss
Guest
kreed wrote:
1987 with about a 100 metre tall antenna with the full length driven
by 20KW or so: they said the induced voltage difference between your
hands and feet on the tower would electrocute you.
For a demo the tech shorted out the last egg insulator on one
of the guy wires which had insulators every 10m or so with a length of
wire and struck up an arc like a small welder, the radio program came
through clearly.
I remember a visit to the Bald Hills shortwave transmitter site in
1987 with about a 100 metre tall antenna with the full length driven
by 20KW or so: they said the induced voltage difference between your
hands and feet on the tower would electrocute you.
For a demo the tech shorted out the last egg insulator on one
of the guy wires which had insulators every 10m or so with a length of
wire and struck up an arc like a small welder, the radio program came
through clearly.
S
Sylvia Else
Guest
On 17/09/2010 10:17 PM, Mark Harriss wrote:
parachute would be nice to have as a backup, but from that height, you
depend on nothing going wrong with the opening.
Sylvia.
It would, but I suspect that climbing down is safer than jumping. A
parachute would be nice to have as a backup, but from that height, you
depend on nothing going wrong with the opening.
Sylvia.
N
Noodnik
Guest
"kreed" <kenreed1999@gmail.com> wrote in message
news:90fc37d2-39fa-4322-953d-28da95292c39@s17g2000prh.googlegroups.com...
On Sep 18, 8:46 am, Mark Harriss <bi...@blartco.co.uk> wrote:
I have seen that one (not at bald hills), where they held an earthed
rod close to the guy wire, and you could hear the program in the
"arc". They claimed that after it was first powered up, neighbours
complained of "speaking roofs" which turned out to be arcing between
the corrugated iron sheets, which resulted in announcers voices being
heard through the "arc".
Bonding them all together was done to solve this problem.
Out of interest, there was a similar ABC AM 5KW array at Hervey bay
QLD with 2 towers that was demolished about 3 years back and a new AM
system built a few KM away. I happened to see it on the 7 news at the
time, they just cut the guy wires and just let the tower simply drop,
then the guys moved in for the next couple of weeks, cut the thing to
bits and carted it off for scrap.
They also had a hut at Bald Hills with the old water cooled valves,
including radiators, pumps and water demineralisation system,
no longer used, but apparently not able to be demolished because of
the national trust or similar. You see that antenna coming into
Brisbane from the north, its very impressive.
I remember fondly a visit to the 6WF/WN transmitter at Wanneroo, near Perth.
There was a combiner hut right next to the mast, where the transmission
lines from the two transmitters (50KW and 10KW IIRC) merged into the feed to
the tower. The whole setup crackled with corona, in time with the program
material.
Don't suppose anyone knows where here are some pics of this setup and the
old transmitters themselves, which have long since been replaced with solid
state? Very little on the web that I can find.
news:90fc37d2-39fa-4322-953d-28da95292c39@s17g2000prh.googlegroups.com...
On Sep 18, 8:46 am, Mark Harriss <bi...@blartco.co.uk> wrote:
I have seen that one (not at bald hills), where they held an earthed
rod close to the guy wire, and you could hear the program in the
"arc". They claimed that after it was first powered up, neighbours
complained of "speaking roofs" which turned out to be arcing between
the corrugated iron sheets, which resulted in announcers voices being
heard through the "arc".
Bonding them all together was done to solve this problem.
Out of interest, there was a similar ABC AM 5KW array at Hervey bay
QLD with 2 towers that was demolished about 3 years back and a new AM
system built a few KM away. I happened to see it on the 7 news at the
time, they just cut the guy wires and just let the tower simply drop,
then the guys moved in for the next couple of weeks, cut the thing to
bits and carted it off for scrap.
They also had a hut at Bald Hills with the old water cooled valves,
including radiators, pumps and water demineralisation system,
no longer used, but apparently not able to be demolished because of
the national trust or similar. You see that antenna coming into
Brisbane from the north, its very impressive.
I remember fondly a visit to the 6WF/WN transmitter at Wanneroo, near Perth.
There was a combiner hut right next to the mast, where the transmission
lines from the two transmitters (50KW and 10KW IIRC) merged into the feed to
the tower. The whole setup crackled with corona, in time with the program
material.
Don't suppose anyone knows where here are some pics of this setup and the
old transmitters themselves, which have long since been replaced with solid
state? Very little on the web that I can find.
K
kreed
Guest
On Sep 18, 8:46 am, Mark Harriss <bi...@blartco.co.uk> wrote:
I have seen that one (not at bald hills), where they held an earthed
rod close to the guy wire, and you could hear the program in the
"arc". They claimed that after it was first powered up, neighbours
complained of "speaking roofs" which turned out to be arcing between
the corrugated iron sheets, which resulted in announcers voices being
heard through the "arc".
Bonding them all together was done to solve this problem.
Out of interest, there was a similar ABC AM 5KW array at Hervey bay
QLD with 2 towers that was demolished about 3 years back and a new AM
system built a few KM away. I happened to see it on the 7 news at the
time, they just cut the guy wires and just let the tower simply drop,
then the guys moved in for the next couple of weeks, cut the thing to
bits and carted it off for scrap.
They also had a hut at Bald Hills with the old water cooled valves,
including radiators, pumps and water demineralisation system,
no longer used, but apparently not able to be demolished because of
the national trust or similar. You see that antenna coming into
Brisbane from the north, its very impressive.
I have seen that one (not at bald hills), where they held an earthed
rod close to the guy wire, and you could hear the program in the
"arc". They claimed that after it was first powered up, neighbours
complained of "speaking roofs" which turned out to be arcing between
the corrugated iron sheets, which resulted in announcers voices being
heard through the "arc".
Bonding them all together was done to solve this problem.
Out of interest, there was a similar ABC AM 5KW array at Hervey bay
QLD with 2 towers that was demolished about 3 years back and a new AM
system built a few KM away. I happened to see it on the 7 news at the
time, they just cut the guy wires and just let the tower simply drop,
then the guys moved in for the next couple of weeks, cut the thing to
bits and carted it off for scrap.
They also had a hut at Bald Hills with the old water cooled valves,
including radiators, pumps and water demineralisation system,
no longer used, but apparently not able to be demolished because of
the national trust or similar. You see that antenna coming into
Brisbane from the north, its very impressive.
D
Dennis
Guest
"Sylvia Else" <sylvia@not.here.invalid> wrote in message
news:8fhcfoFhomU1@mid.individual.net...
news:8fhcfoFhomU1@mid.individual.net...
Without a parachute the wait on the way down would be worse!
S
Sylvia Else
Guest
On 18/09/2010 3:29 PM, Dennis wrote:
message to Twitter and update their Facebook page in that time.
Sylvia.
Hmmm. Trip time is around 15 seconds. Some teenagers could send a
message to Twitter and update their Facebook page in that time.
Sylvia.
S
Sylvia Else
Guest
On 18/09/2010 3:30 PM, philx1 wrote:
obviously has its risks, but I doubt any of these guys will die from
lack of exercise.
Sylvia.
Helicopters and towers haven't always been a good mixture. FreeclimbingOn Sep 17, 7:33 pm, Mark Harriss<bi...@blartco.co.uk> wrote:
I'd have trouble doing this guys job:http://www.koreus.com/video/reparer-antenne-540m.html#
Geez Mark, thanks for that (NOT)! My testes are hurting just from
watching this. Dunno why, maybe fear of heights?
I'm also wondering if they've heard of helicopters there.
Maybe it's like this cheaper because they're 'free' climbers
Anyway, keeps 'em off the street I guess...
obviously has its risks, but I doubt any of these guys will die from
lack of exercise.
Sylvia.
M
Mark Harriss
Guest
Noodnik wrote:
It was very old equipment probably 1920-1930's vintage, coils made out
copper waterpipe etc.
that was very comprehensive and a good read for the average tech head.
I picked up some valves from the Darwin shortwave transmitter that the
Gov't sold to private enterprise on Ebay after it closed due to the site
lease expiring. As far as I know, even the scrappies weren't interested,
broadcast gear for the taking!!.
It was very old equipment probably 1920-1930's vintage, coils made out
copper waterpipe etc.
There is a limited edition self published book by some radio engineer
that was very comprehensive and a good read for the average tech head.
I picked up some valves from the Darwin shortwave transmitter that the
Gov't sold to private enterprise on Ebay after it closed due to the site
lease expiring. As far as I know, even the scrappies weren't interested,
broadcast gear for the taking!!.