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Subject: Re: [LML] Fuel probe calibration
From: Robert Froelich <qth2369@gmail.com>
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I had a bad probe in my IV right wing.  With the tank empty the probe
should put out about a 2000 hz signal.  As the tank fills, the frequency
drops to about 1000 hz at full.  The bad probe would only work
intermittently when full voltage was applied instantly.  If the voltage
built up slowly, the probe would not work.  An L3 design expect diagnosed
my problem with the probe.  A new probe was shipped to me, free of charge.
Checking with a Motorola next door tech, he has seen a similar problem with
some computer chips.

Robert Froelich, N4YX

On Wed, Apr 18, 2012 at 8:00 AM, Dennis Ramsey <doramsey@gmail.com> wrote:

> I am trying to calibrate the fuel probes on my IV and trying to determine
> when I should see an indication on the fuel probes.   Can other IV builders
> tell me how many gallons they had in the tank before they saw a increase in
> output from the fuel probe.   I have the EI P300C probes.

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I had a bad probe in my IV right wing.=A0 With the tank empty the probe sho=
uld put out about a 2000 hz signal.=A0 As the tank fills, the frequency dro=
ps to about 1000 hz at full.=A0 The bad probe would only work intermittentl=
y when full voltage was applied instantly.=A0 If the voltage built up slowl=
y, the probe would not work.=A0 An L3 design expect diagnosed my problem wi=
th the probe.=A0 A new probe was shipped to me, free of charge.=A0 Checking=
 with a Motorola next door tech, he has seen a similar problem with some co=
mputer chips. <br>
<br>Robert Froelich, N4YX<br><br><div class=3D"gmail_quote">On Wed, Apr 18,=
 2012 at 8:00 AM, Dennis Ramsey <span dir=3D"ltr">&lt;<a href=3D"mailto:dor=
amsey@gmail.com">doramsey@gmail.com</a>&gt;</span> wrote:<br><blockquote cl=
ass=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;p=
adding-left:1ex">
I am trying to calibrate the fuel probes on my IV and trying to determine w=
hen I should see an indication on the fuel probes.=A0=A0 Can other IV build=
ers tell me how many gallons they had in the tank before they saw a increas=
e in output from the fuel probe.=A0=A0 I have the EI P300C probes.=A0=A0=20
</blockquote></div><br>

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