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	<830F0804F1574EA8B4F36C4F30A5B0D4@JimPC>
Date: Tue, 25 Jan 2011 21:28:25 +0000
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From: Andy Talbot <andy.g4jnt@gmail.com>
To: rsgb_lf_group@blacksheep.org
DomainKey-Status: good (testing) 
Subject: Re: LF: Re: WSPR Beacon
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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
www.g4jnt.com




On 25 January 2011 21:14, James Moritz <james.moritz@btopenworld.com> 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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<div>Mine is a model 1000-WA-MFN-30.=A0 A big black heavy thing aruond 250=
=A0x 300 long=A0x 150mm high, =A0but suspect its innards are much the same=
.</div>
<div>=A0</div>
<div>Ironic really, I used to have an old Naval HF-only load made from 6=
 big carbon resistors that glowed=A0dull red with 700W of 137kHz=A0=A0A cu=
rrent transformer added on the input going off to=A0a test port turned it=
 into=A0a better power measurement tool than this Bird can manage.=A0=A0=
 Sold it when the Bird became available.=A0=A0 Wish I hadn&#39;t now.=A0=
=A0=A0</div>

<div>=A0</div>
<div>But at least the coupler is calibrateable (does that word need the &#=
39;e&#39; ?)</div>
<div>=A0</div>
<div>Andy</div>
<div><a href=3D"http://www.g4jnt.com/">www.g4jnt.com</a></div>
<div>=A0</div>
<div><br><br>=A0</div>
<div class=3D"gmail_quote">On 25 January 2011 21:14, James Moritz <span di=
r=3D"ltr">&lt;<a href=3D"mailto:james.moritz@btopenworld.com">james.moritz=
@btopenworld.com</a>&gt;</span> wrote:<br>
<blockquote style=3D"BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8e=
x; PADDING-LEFT: 1ex" class=3D"gmail_quote">Dear Andy, LF Group,<br><br>Th=
e SNR for your beacon received here is up by 3-4dB, so in line with expect=
ations.<br>
<br><br>
<blockquote style=3D"BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8e=
x; PADDING-LEFT: 1ex" class=3D"gmail_quote">And talking of test loads. =A0=
 =A0The 1kW 1GHz Bird attenuator increases its<br>attenuation value as it=
 gets warm.<br>
</blockquote><br>My dummy load behaves in the same way - it may be the sam=
e as you have, it is a Bird Tenuline model 8327. So whatever its virtues,=
 temperature stability does not seem to be one of them!<br><br>Cheers, Jim=
 Moritz<br>
73 de M0BMU <br><br></blockquote></div><br>

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