A useful piece of test equipment for any radio amateur is a device that lets you connect a frequency counter or an Oscilloscope to the RF output of your transmitter. This project is for such a device. The original circuit was noted as able to handle up to 200 Watts at a frequency range of 1.8 to 450 MHz.
C1 = 5pf 1kv.
D1, D2 = 1N914.
R1 = 50Ω 5% ¼Watt.
(I've had emails asking where a 50Ω resistor can be obtained. The E12 series has 47Ω as the nearest, this would do the job (if you have several you could test each one and select the closest to 50Ω) or you could parallel 2 100Ω to make 50Ω)
J1, J2 = Your preferred coaxial sockets (BNC is usually a good choice).
B1 = Metal box.
Nuts and bolts to suit.
On the right is the general layout.
Referring to the diagram above, connect it up to a 'T' coaxial adptor to suit your connections, the transceiver under test and a dummy load.
Connect your oscilloscope or frequency counter to the output.