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Date: Sat, 2 Mar 2013 13:18:42 -0500
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From: Warren Ziegler <wd2xgj@gmail.com>
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: Decca 5501 mod, conditions, noise mitigation, 8970 et al;
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Hi Laurence,
Very interesting on all points!
Mal G3KEV took a Decca PA module out and used it with external tank
circuits - no mods to the Decca. Plug the amp module back into the Decca
chassis and Bob's your uncle your back on 137.
I will send you the info if Mal doesn't beat me to it!
73 K2ORS

73 K2ORS
On Mar 2, 2013 1:03 PM, "Laurence KL1 X" <hellozerohellozero@hotmail.com>
wrote:

>  *Decca 5501 mod -*
>
> I think I recall that the late G3AQC, maybe others  had a clever way of
> installing mods allowing it to be "switched"  between 137 and 500 - if
> anyone has any details Id like to hear or see them - with thanks.
> *
> Conditions *-
>
> Well - its been a very poor LF season up here to date - with only a couple
> of Eu openings, obviously my stars havent been aligned, or moreover the
> Coronal holes have been.  At least the nights are getting shorter
>
>  - HF conditions are very poor too at this time. Still its good X country
> skiing weather and the Aurora are pretty.
> *
> VLF*
>
> If anyone wants to spark up on 8970Hz again from Eu Im looking at slow
> QRSS's and shoving the results out on the web site.
>
>  The s/n noise is now vastly improved down there too using the E field
> L400B.
> *
> QRM*
>
> I spent yesterday after noon with our local power utility linesman
> tracking down a noise source(s) pulsing away at 9Khz prf from 50kHz to 5MHz
> - traced one to a house about 0.4 miles from here, and I have a second one
> with the same sort of signature which is proving more difficult to DF.  I
> havent approached the owners yet, but heck sitting outside the offenders
> house on the road in the car with the SDRIQ and another L400B magmount the
> pulses were stronger than local NDB and some MW broadcast signals and a
> huge amount being re radiated from the underground power lines - so you can
> imagine something fairly meaty shoving out this do doo, especially as I can
> hear the same signatures (but maybe not the same source) on overhead HT
> power lines some 5 miles away - Im guessing home automation, but it might
> be a wayward lighting switch or blender :-) . If your interested theres a
> visual capture of the interference source covering the MF band at
>
> http://kl7uk.com/Screen7.png
>
> or on WSPR water fall   http://kl7uk.com/MEA1.png
>
>
> Cheers
>
>
>
>
>
> Laurence KL 1 X  WE2 XPQ
>

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<p>Hi Laurence,<br>
Very interesting on all points!<br>
Mal G3KEV took a Decca PA module out and used it with external tank circuit=
s - no mods to the Decca. Plug the amp module back into the Decca chassis a=
nd Bob&#39;s your uncle your back on 137.<br>
I will send you the info if Mal doesn&#39;t beat me to it!<br>
73 K2ORS<br></p>
<p>73 K2ORS</p>
<div class=3D"gmail_quote">On Mar 2, 2013 1:03 PM, &quot;Laurence KL1 X&quo=
t; &lt;<a href=3D"mailto:hellozerohellozero@hotmail.com">hellozerohellozero=
@hotmail.com</a>&gt; wrote:<br type=3D"attribution"><blockquote class=3D"gm=
ail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-le=
ft:1ex">



<div><div dir=3D"ltr">


<div dir=3D"ltr"><b>Decca 5501 mod -</b><br><br>I think I recall that the l=
ate G3AQC, maybe others=A0 had a clever way of installing mods allowing it =
to be &quot;switched&quot;=A0 between 137 and 500 - if anyone has any detai=
ls Id like to hear or see them - with thanks.<br>
<b><br>Conditions </b>-<br><br>Well - its been a very poor LF season up her=
e to date - with only a couple of Eu openings, obviously my stars havent be=
en aligned, or moreover the Coronal holes have been.=A0 At least the nights=
 are getting shorter<br>
<br>=A0- HF conditions are very poor too at this time. Still its good X cou=
ntry skiing weather and the Aurora are pretty.<br><b><br>VLF</b><br><br>If =
anyone wants to spark up on 8970Hz again from Eu Im looking at slow QRSS=
9;s and shoving the results out on the web site.<br>
<br>=A0The s/n noise is now vastly improved down there too using the E fiel=
d L400B.<br><b><br>QRM</b><br><br>I spent yesterday after noon with our loc=
al power utility linesman tracking down a noise source(s) pulsing away at 9=
Khz prf from 50kHz to 5MHz - traced one to a house about 0.4 miles from her=
e, and I have a second one with the same sort of signature which is proving=
 more difficult to DF.=A0 I havent approached the owners yet, but heck sitt=
ing outside the offenders house on the road in the car with the SDRIQ and a=
nother L400B magmount the pulses were stronger than local NDB and some MW b=
roadcast signals and a huge amount being re radiated from the underground p=
ower lines - so you can imagine something fairly meaty shoving out this do =
doo, especially as I can hear the same signatures (but maybe not the same s=
ource) on overhead HT power lines some 5 miles away - Im guessing home auto=
mation, but it might be a wayward lighting switch or blender :-) . If your =
interested theres a visual capture of the interference source covering the =
MF band at <br>
<br><a href=3D"http://kl7uk.com/Screen7.png" target=3D"_blank">http://kl7uk=
.com/Screen7.png</a> <br><br>or on WSPR water fall =A0 <a href=3D"http://kl=
7uk.com/MEA1.png" target=3D"_blank">http://kl7uk.com/MEA1.png</a><br><br><b=
r>Cheers<br>
<br><br><br><br><br>Laurence KL 1 X=A0 WE2 XPQ<br></div>
 		 	   		  </div></div>
</blockquote></div>

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