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Initial test
To verify proper soldering, it is recommended to use a multimeter and measure the resistance across the
input BNC connector or between the header pin 1 and 4. The value should be close to 50 Ohms.
If not, there may be one or more bad solder joints in the resistor array.
Operation
The dummy load is easy to use. Simply connect your transmitter input to the BNC
To measure RF Power, connect your multimeter to pin 1 and Pin 2 or 3.
Pin 1 is ground and the DC output voltages appear on pins 2 and 3 of SV1.
Pin 2 provides the RMS value of the RF voltage.
Pin 3 gives the Peak value of the RF voltage.
Pin 4 is direct RF voltage across the resistors.
RF power is calculated from this relationship: Power = (Vrms^2)/50
Note: The power input should be limited to 15W to avoid damaging resistors and circuit components.
Specifications
Recommended Power Limits:
Input Impedance:
Usable Frequency Range:
Outputs on pin header SV1:
DummyLoad20190402
15 watts: 5 minutes
10 watts: 10 minutes
5 watts or less: continuous
50 Ohms +/- 5%
DC to 60MHz
1. Ground
2. Vrms: DC voltage representing the RMS value of the RF voltage
3. Vpeak: DC voltage representing the peak RF voltage
4. Direct RF voltage
Support Email:
qrpkits.com@gmail.com
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