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Re: LF: Re: WSPR Beacon

from [Andy Talbot] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: Re: WSPR Beacon
From: Andy Talbot <[email protected]>
Date: Tue, 25 Jan 2011 21:28:25 +0000
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Mine is a model 1000-WA-MFN-30.  A big black heavy thing aruond 250 x 300 long x 150mm high,  but suspect its innards are much the same.
 
Ironic really, I used to have an old Naval HF-only load made from 6 big carbon resistors that glowed dull red with 700W of 137kHz  A current transformer added on the input going off to a test port turned it into a better power measurement tool than this Bird can manage.   Sold it when the Bird became available.   Wish I hadn't now.   
 
But at least the coupler is calibrateable (does that word need the 'e' ?)
 
Andy
 


 
On 25 January 2011 21:14, James Moritz <[email protected]> wrote:
Dear Andy, LF Group,

The SNR for your beacon received here is up by 3-4dB, so in line with expectations.


And talking of test loads.    The 1kW 1GHz Bird attenuator increases its
attenuation value as it gets warm.

My dummy load behaves in the same way - it may be the same as you have, it is a Bird Tenuline model 8327. So whatever its virtues, temperature stability does not seem to be one of them!

Cheers, Jim Moritz
73 de M0BMU


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