[Elecraft] Power Measurement Instrument

[Larry Weaver]

I built one of these from the Kanga parts. It was useful in building the 
K2. With the pad, It can handle 100 watts. Accurate readings can be 
obtained by connecting a DMM for readout rather than the meter.

It's sensitivity also makes it an excellent field strength meter with 
highly linear readout jn dB--plus it works up to 500 MHZ. I've used  it to 
compare HT antennas for 70 cm. Also makes a good "rf sniffer."

I built mine "dead bug" style.

73...Larry N6TW




At 20:11 11/8/02, Ron D'Eau Claire wrote:
>Yes, there are a lot of good power meters out there. My reason for
>bringing up the Hayward/Larkin design that was published in the June
>2001 QST what that it has a range none of the others can touch. It reads
>accurately all the way down to - 70 dBm (< 0.1 Nanowatt). I've built
>receivers that aren't that sensitive <G>.
>
>That makes it useful for troubleshooting low level stages in rigs, doing
>filter characterization with a simple signal generator, doing gain
>measurements in low-level amplifiers, making return-loss measurements in
>transmission lines as well as acting as a very sensitive bridge meter
>for SWR measurements.
>
>With its ability to measure power all the way up to +50 dBM (100 watts)
>it's perfect for measuring the output of most transmitters, including
>the K2/100.
>
>There is one company
>(http://www.bright.net/~kanga/kanga/power_meter.htm) who kits the parts
>for the meter and sells them for $40. It includes everything except a
>0-1 ma meter movement (Hayward used a Radio Shack meter) and an
>enclosure.
>
>This is no Elecraft kit. It's simply the parts needed to build the unit
>following the article in QST. But it's really quite straightforward and
>the price is very hard to beat!
>
>Same disclaimer as my first post: I have not built mine yet, but I've
>built most of the homebrew test equipment that Hayward had designed over
>the past three decades and I've never been disappointed in the results.
>Also, I've never failed to learn something in the process.
>
>Ron AC7AC
>K2 # 1289
>
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