KX1 Power Output

[TAC]

I hope you can read this, but do the values look reasonable, for a KX1
with the output power mod.  Peak to peak (Vpp) voltages and RMS (Vrms)
were taken with a high end O'scope and used to compute the Power
values (Ppp and Prms).

Seems the KX1 read the supply voltage about 0.4 volts low.

Thanks,
Tom Crites, KC8SES



KX1 Power Output
                               
Supply Voltage 14.0
KX1 Dispaly Voltage 13.6
Freq (MHz)                 3.675 7.100 10.100 14.025
Output Vpp                43.10 35.00 34.70 35.30
Output Vrms                15.08 12.28 12.13 12.38
ATU Displayed power        4.5 to 5.0 3.00         3.00        3.50
Ppp (watts)                 4.53        2.99          2.93 3.04
Prms (watts)                4.43        2.94          2.87 2.99
                               
Supply Voltage 9.5
KX1 Dispaly Voltage 9.1
Freq (MHz)              3.675 7.100 10.100 14.025
Output Vpp              29.40 24.40 24.70 25.60
Output Vrms              10.14 8.43        8.52        8.94
ATU Displayed power        2.10 1.50        1.70        1.80
Ppp (watts)                2.11 1.45        1.49        1.60
Prms (watts)                2.00 1.39        1.42        1.56
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[Don Wilhelm-4]

Tom,

Yes, your values look reasonable.  The KX1 will always indicate that the
voltage is about 0.4 volts lower than read at your supply.  There is a
series diode to prevent damage from reverse polarity, so the inside of
the KX1 sees a voltage that is one diode drop less than your supply.

73,
Don W3FPR

On 1/30/2012 9:44 PM, Tom Crites wrote:

> I hope you can read this, but do the values look reasonable, for a KX1
> with the output power mod.  Peak to peak (Vpp) voltages and RMS (Vrms)
> were taken with a high end O'scope and used to compute the Power
> values (Ppp and Prms).
>
> Seems the KX1 read the supply voltage about 0.4 volts low.
>
> Thanks,
> Tom Crites, KC8SES
>
>

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