[Amps] Drake W4 Wattmeter Question
Lloyd Korb
k8dio at windstream.net
Sat Dec 20 13:19:46 EST 2008
I have a question on my Drake W4 wattmeter. Since I don't have a high power
wattmeter I picked up the W4 on eBay to use on my AL-1200. I have found
that the calibration is off starting on 15 meters. I did some comparisons,
at the 100 watt level on my TS-2000, with my Bird with a 100A element and my
Drake WV4 VHF wattmeter. I didn't go below 15 meters as the WV4 is only good
down to 20 MHz. The Bird 100A is good from 25 - 60 MHz. This is what I
found:
Freq Drake W4 Bird 43 Drake WV4
50 MHz 70W 100W 95W
28 MHz 75W 95W 90W
21 MHz 80W 91W 90W
14 MHz 85W
7 MHz 90W
I took a look at the W4 schematic and couldn't find anything, obvious, that
would make the meter so frequency sensitive. Any ideas would be
appreciated.
73, Lloyd K8DIO
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