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Re: LF: Unusual radio mast video Ukraine ??

To: [email protected]
Subject: Re: LF: Unusual radio mast video Ukraine ??
From: DAVE PICK <[email protected]>
Date: Wed, 26 Dec 2012 23:34:57 +0000
In-reply-to: <[email protected]>
References: <[email protected]> <[email protected]> <[email protected]om> <[email protected]> <[email protected]om> <[email protected]> <[email protected]>
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Sender: [email protected]
Standing waves? On a matched feeder?
This was mainly at Wooferton in the early seventies.

Dave.

On 24 December 2012 14:35, Mark <[email protected]> wrote:
The open wire feeders are balanced feeders , the bird acts as a capacitance on one side and the result is that a small amount of the incident power is diverted.  The worst part is that sometimes the birds survived, but left their feet on the feeder.
 Bear in mind that these shortwave feeders are connected to senders running from 100kW to 300kW depending on era. 
Arcs in the antenna field were not uncommon during my days on shortwave.  We dreaded stubble burning season  large lumps of ash played havoc with open wire systems
 
Dave, I wonder where you worked? I had spells at Daventry and Wooferton and some project work at Rampisham and Skelton
 
 

From: M0FMT
Sent: Monday, December 24, 2012 11:51 AM
Subject: Re: LF: Unusual radio mast video Ukraine ??

Hi Dave
 
Must have had the bad luck to step on a voltage peak of the standing wave? 
73 es GL, HNY es MX Pete M0FMT IO91UX
From: DAVE PICK <[email protected]>
To: [email protected]
Sent: Monday, 24 December 2012, 10:32
Subject: Re: LF: Unusual radio mast video Ukraine ??

I used to work on short-wave broadcast stations using open wire feeders. When a bird alighted on one feeder a huge arc would be struck and I could plainly hear the audio from the service. Once the transmitter had tripped and the smoke cleared, all that remained of the bird was its feet stuck to the wire...

Merry Christmas!

Dave G3YXM


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