Accuracy of W1 wattmeter

[Vic K2VCO]

The new W1 wattmeter is spec'd to provide 0.5 db accuracy.  Is this 0.5
db of full scale or of the actual reading?

If the former, then I figure that the reading at 5 watts would be plus
or minus about 1.8 watts.  If the latter, about 0.6 watts (I am not good
at doing this stuff in my head -- is this right)?
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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[Earl W Cunningham]

Vic, K2VCO wrote:

"The new W1 wattmeter is spec'd to provide 0.5 db accuracy.  Is this 0.5
db of full scale or of the actual reading?

If the former, then I figure that the reading at 5 watts would be plus or
minus about 1.8 watts.  If the latter, about 0.6 watts (I am not good at
doing this stuff in my head -- is this right)?"
==========
I don't know what the FS reading of the W1 wattmeter is, but 5 watts +/-
0.5 db  would be 4.456 to 5.61 watts, or -0.544 and +0.61 watts.

73, de Earl
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[Steven Pituch]

Hi all,
I need to make or purchase an alternator line filter for my Ford F-150
pickup truck.  I have searched on the net for a design that would specify
the toroid mix and other details but have not found anything very good so
far.  What mix and size toroid would you use in the DC line to filter out
the alternator whine?

Regards,
Steve Pituch, W2MY


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[Ken Kopp-2]

Caution ... are you SURE you're hearing alternator noise
and NOT the fule pump noise that Ford PU's are infamous
for?  I have one, BTW.

If it's indeed alternator noise, take a look (Google) 'NEWMAR'.
They have an extensive line of quality products.

73! Ken Kopp - K0PP
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[Steven Pituch]

-----Original Message-----
From: Ken Kopp [mailto:[hidden email]]

Caution ... are you SURE you're hearing alternator noise and NOT the fule
pump noise that Ford PU's are infamous for?  I have one, BTW.

If it's indeed alternator noise, take a look (Google) 'NEWMAR'.
They have an extensive line of quality products.

73! Ken Kopp - K0PP
[hidden email]
or
[hidden email]

Hi Ken,
Noise rises in frequency as I press on the gas pedal.  I have also have read
about the electric fuel pump noise but haven't detected it yet.

Yes, I have seen the Newmar filters.  They are very nice.  I have seen one
for at little as $125.  
http://www.tessco.com/products/displayProductInfo.do?sku=99967&eventPage=1
That's why I want to built one myself.  If I can figure out what would be a
good toroid core say in the T240 size, I think I can build one as nice for
about $30.  I might need to stack three, or put several wound toroids in
series.  That’s why I was looking for some advice since I am not good at
picking out the correct toroid mix from the spec sheets.
There are some toroids recommended by WA1MVX at
http://www.sanantoniohams.org/Tips/whine.htm
They are made by SIFERRIT and are ferrite, 64mm O.D., and type 87 material.
http://www.surplusmaster.com/prods/comp/misc1.htm
However, I don't know if a better material is available and I don’t know if
I want to buy 20 of them.

Regards,
Steve, W2MY

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