Low Power/QRP Dummy Load - 12 Watt portable operator load

Description

QRP 50 Ω Dummy Load for Amateur/Ham radio use and experiments.
Fully Built - Not a Kit
This dummy load has been designed to provide constant 50 Ω impedance to a radio transmitter to allow off air tests and experiments.
Constructed of high quality PCB material and using 4 x 200 Ω 3 Watt Metal Film resistors a SWR of 1.0:1 is possible from 1MHz – 100 MHz, the SWR increases to 1.1:1 above 110 MHz, Upper limit before SWR rises to 2.5:1 is 200Mhz
The dummy load is air cooled and capable of absorbing RF energy of 10 - 12 Watts continuously for 1 minute, and up to 25 Watts for several seconds.
The dummy load incorporates a measuring port consisting of a capacitor (630 V DC rating) and diode (BAV21) with output terminals allowing the dummy load to be connected to a voltmeter, and with a simple calculation the output voltage is converted to output power;
Calculation = Voltage Squared / 100 = Watts Out.   For example measured voltage = 25
VDC
, which is 625 squared, divide 625 by 100 = 6.25 Watts
Connection to the dummy load is via a high quality Male BNC jack mounted on the PCB, by request this can be changed to a female jack of the same (chassis) style if needed.
The PCB measures (approx.) 1.25” x 2.25” – it takes up no room in your 'go-bag' and allows a portable QRP radio to be tested without transmitting on air.
The load can  also be used as a 50
Ω test load, for checking antenna analyzer accuracy or other tests where a discrete 50
Ω reference is needed.
Please note: Sale is for dummy load only
Supplied as a finished PCB with all components mounted on the board this compact radio accessory is ready to go out of the box.
Questions – Please ask, if you don’t see the answer in my description
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