[TowerTalk] Coax loss. Has anybody measured it ?

[Yan (XV4Y)]

Go for a "tower-mounted shack" and you will even solve the feed lines losses we're talking about in another thread.

By the way. That's what we do for medium-power microwave telecommunication equipments. The "feeders" only see a small signal IF, and all the "power stuff" is up-there close to the antenna system.
For high power you still prefer to have in a safe place and run hard lines or better waveguides.
Perhaps it's easier to do maintenance on heavy tubes amplifiers on the ground rather than up on the top of the tower...

73,
Yan.
---
Yannick DEVOS - XV4Y
http://www.qscope.org/
http://xv4y.radioclub.asia/

Le 25 nov. 2014 à 01:50, towertalk-request at contesting.com a écrit :

> Message: 3
> Date: Mon, 24 Nov 2014 10:34:37 -0800
> From: Bill Turner <dezrat at outlook.com>
> To: Towertalk <towertalk at contesting.com>
> Subject: Re: [TowerTalk] Coax loss. Has anybody measured it ?
> Message-ID: <BLU436-SMTP238F6947E16393D2846EE3BC0720 at phx.gbl>
> Content-Type: text/plain; charset="us-ascii"
> 
> ------------ ORIGINAL MESSAGE ------------(may be snipped)
> 
> On Mon, 24 Nov 2014 07:56:53 -0800, Jim T. wrote:
> 
>> 
>> I highly suspect if folks actually measured the power at the top of the tower, vs the back of amp..... they would be in for a rude awakening......esp on long runs...and on upper bands like 20-10m. 
> 
> REPLY:
> 
> "Top of the tower" got me to thinking.  One way to solve this problem
> would be a tower-mounted amplifier. 
> 
> It should be broadband, i.e. no tune except for SWR matching, power
> supply on the ground and with remote monitoring.  It almost certainly
> would be solid state.  You would still have to run coax for the drive,
> but it could be smaller, such as RG-58, and losses would not be so
> much an issue. Just crank up your transceiver to get the required
> output. 
> 
> One major problem would be protecting it from lightning strikes. 
> 
> Manufacturers, are you interested?
> 
> 73, Bill W6WRT