Michael,
In general, digital wattmeters have the same accuracy at any point on
the scale - unlike analog wattmeters for which the accuracy is stated as
a percentage of the full scale reading. On a 20 watt scale, a 25% error
would be up to 4 watts!
You might want to look at the specs for that 440 MHz transmitter as
well. If it 2.6 dB or so, getting 2.8 watts out for a 5 watt setting
may be what you can expect.
73,
Don W3FPR
On 7/30/2017 4:59 PM, Michael via Elecraft wrote:
OK so I am trying to measure around 5 Watts or so on the W2's 20 Watt
scale. The spec's for the W2 directional couplers are listed at 0.5 dB
accuracy. Is this anywhere or just at full scale? How much could it be off at
only 25% of full scale?
Trying to decide if the 2.8 Watts I am reading at 440 MHz on high power is
too low with a spec of 5 Watts output! If it is I can send it back to the
place of purchase to be checked and exchanged if necessary.
There seems to be no problem on the 2 Meter band at only 25 % of scale (5
Watts) reading....just on 440.
Michael
n2zdb
In a message dated 07/30/2017 12:36:49 P.M. Eastern Daylight Time,
[email protected] writes:
The accuracy of a Bird Model 43 is +/- 5% of full scale. The meter scale
is not
linear and produces the best read accuracy in the bottom portion of the
meter's
scale.
There are numerous watt meters on the market today that are more accurate.
FWIW 73!
Ken Kopp - K0PP
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On Sun, Jul 30, 2017 at 9:23 AM, Michael Walker <[email protected]>
wrote:
The only way to get the answer you wish is to compare it to a bench
standard like a bird watt meter.
Beyond that you are just guessing. Sorry
Mike va3mw
On Sun, Jul 30, 2017 at 11:18 AM, Michael via Elecraft <
[email protected]> wrote:
Measurement is in analog mode.....should have made that clear or not even
mentioned a digital radio!
Michael
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