Message-ID: <BLU146-W100210EF7141D666F59B5CF400@phx.gbl>
From: Laurence KL1X <hellozerohellozero@hotmail.com>
To: <rsgb_lf_group@blacksheep.org>, <lowfer@mailman.qth.net>
Date: Thu, 25 Feb 2010 11:06:38 -0900
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Subject: LF: Reverse PLT QRM - From  Electrical supply power meter
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=20

Ive been talking about  my qrm on 137 khz for some time and have long susp=
ected the ABB/Landis/Gyr/Hunt mechanical electrical meter as installed by=
 the electrical power company on their side on the incoming 2 phase supply=
 -

=20

=20

They use remote data collection using the power lines at a very low data=
 rate- with a "Turtle" module installed inside the meter  - aka

http://www.barronelectric.com/energy/turtletech.html and "The Turtle modul=
e is installed in the meter at your house and the consumption information=
 is sent to a Turtle receiver at the nearest electrical substation, using=
 the power lines. From there, the information is delivered by phone to the=
 Turtle software in the Electric Meter Shop, where the information is proc=
essed for the billing department. The entire process takes about 27 hours=
 to complete, thus, the name =93Turtle=94. =20

=20

Its a low bit rate device - trouble is it was injecting wide band old styl=
e car ignition noise at some S7 and radiating using the house wiring - Noi=
se was audible at some strength from 70-500Khz. The electrical company muc=
h to their credit didnt blow me off - especially when I held a Eton style=
 SSB rx near the meter and when the guy unplugged the "EVM" turtle device=
 and the noise dissapeared - he tried different models, capacitors etc but=
 unable to clear.

=20

The final resolution was the electrical supply company to completely remov=
e this device from inside the meter and will now come round and "read' the=
 mechanical meter once a month - a backwards step in their view money/time=
 savings but they agreed that this PLT system in incompatiable with my noi=
se level needs.

=20

just a heads up if your encountering a similar noise....

=20

I now have a much better s/n down on 137

=20

Laurence KL 1X Wasilla Alaska

WE2XPQ

                     =20
_________________________________________________________________
Hotmail: Powerful Free email with security by Microsoft.
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&nbsp;<BR>
Ive been talking about &nbsp;my qrm on 137 khz for some time and have long=
 suspected the ABB/Landis/Gyr/Hunt mechanical electrical meter as installe=
d by the electrical power company on their side on the incoming 2 phase su=
pply -<BR>
&nbsp;<BR>
&nbsp;<BR>
They use remote data collection using the power lines at a very low data=
 rate-&nbsp;with a "Turtle" module installed inside the meter&nbsp; - aka<=
BR>
<A href=3D"http://www.barronelectric.com/energy/turtletech.html">http://ww=
w.barronelectric.com/energy/turtletech.html</A>&nbsp;and "The&nbsp;Turtle=
 module is installed in the meter at your house and the consumption inform=
ation is sent to a Turtle receiver at the nearest electrical substation,=
 using the power lines. From there, the information is delivered by phone=
 to the Turtle software in the Electric Meter Shop, where the information=
 is processed for the billing department. The entire process takes about=
 27 hours to complete, thus, the name =93Turtle=94.&nbsp; <BR>
&nbsp;<BR>
Its a low bit rate device - trouble is it was injecting wide band old styl=
e car ignition noise at some S7 and radiating using the house wiring - Noi=
se was audible at some strength from 70-500Khz. The electrical company muc=
h to their credit didnt blow me off - especially when I held a Eton style=
 SSB rx near the meter and when the guy unplugged the "EVM" turtle device=
 and the noise dissapeared - he tried different models, capacitors etc but=
 unable to clear.<BR>
&nbsp;<BR>
The final resolution was the electrical supply company to completely remov=
e this device from inside the meter and will now come round and "read' the=
 mechanical meter once a month - a backwards step in their view money/time=
 savings but they agreed that this PLT system in incompatiable with my noi=
se level needs.<BR>
&nbsp;<BR>
just a heads up if your encountering a similar noise....<BR>
&nbsp;<BR>
I now have a much better s/n down on 137<BR>
&nbsp;<BR>
Laurence KL 1X Wasilla Alaska<BR>
WE2XPQ<BR><BR>                    <br /><hr />Hotmail: Powerful Free email=
 with security by Microsoft. <a href=3D'http://clk.atdmt.com/GBL/go/201469=
230/direct/01/' target=3D'_new'>Get it now.</a></body>
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