[Elecraft] Modifying Wattmeter Slugs for QRP

[Larry Phipps]

Before you open it up, you might want to see if you can find some 
documentation on the Model 4410A multi-range meter. I have one, and it 
has switchable scales from 0-2W to 0-1000W using a single 4410-3 slug. 
It has an amplifier in it with precision dividers I think. Much of the 
Bird stuff is searchable in patent apps if you want to figure out how 
they did things.

You might want to see what's inside this sensitive slug, as that's the 
key to the multiple scales.

Larry N8LP



Arthur Delibert wrote:

>I have a Bird wattmeter that I'd like to use with QRP rigs.  As best I can tell, though, Bird did not make slugs smaller than 50 watts for the 2-30 MHz range.
>
>There is a website that discusses how to open a Bird slug and modify it for a different power level and/or frequency range.  [http://www.hayseed.net/~jpk5lad/BIRD%20Slugs/birdslug1.htm]
>
>I'm wondering if anyone has tried to modify, say, a 2-30MHz/50-watt slug for 10 watts and if so, any experience to share?  What was the right resistor value?  How was the linearity of the meter with the modified slug?
>
>Thanks for any experience or insights.
>
>Art Delibert
>KB3FJO
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