Tom,
Have you checked that external wattmeter at 5 watts?
Many wattmeters when on the 200 watt range may not show any significant
output until you get to 10 or 20 watts.
Use the 20 watt range on the wattmeter - and do not really trust it at
the 5 watt level. The diodes in many wattmeters are a potential problem
and may not register anything unless the power is 10 watts and above.
The exception is QRP wattmeters with op amps and compensating diodes.
If you have access to a 'scope with a 10X probe, that is more accurate.
Set the scope to read the RF voltage and connect it across the dummy
load. If your dummy load does not allow access to the coax center
conductor, use a Tee adapter to access the center conductor.
The RF peak to peak voltage for 5 watts is 44.7 volts.
Bottom line - do not trust your instruments (wattmeter in this case)
until it is proven trustworthy at the power level involved.
73,
Don W3FPR
On 12/16/2017 6:20 PM, Tom Norris wrote:
Newly assembled working great so far.
At the Owners Manual Calibration Procedures pg 52 (Fred Cady book Elecraft
K3S and P3 referred me to Owners Manual for some Calibrations after going
through Configuring the K3S pg 26...)
Wattmeter:
Both CONFIG:TUN PWR and PWR SET to NOR (KPA3A not installed yet, all covers
on.
Low-Power (5 W) W mtr calibration
On 20 meter band at 14.050
On a 1kw Cantenna 50 ohm dummy load (ch'd w/ Ohm meter)
Set power to 5.0 watts on K3S with Pwr knob
Go to CONFIG WMTR LP showing
Press TUNE (hear signal on Omni D) but does not register on ext W Mtr and
cannot vary output with VFO A knob (which is the instructed 'Parameter'
adjustment knob I assume?)
Ext W Mtr is working ok with Omni D output
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