M2 6M-1K2 Operating Instructions Manual - Overview
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small 50 Ohm coax to a medium power relay followed by the 100W power attenuator. Then the RF passes through an
impedance matching network and coaxial transformer and on to the gates of the device. Bias voltage also passes through
the transformer. The emitter of the device is grounded to its flange base (header) which in turn is attached to the copper
heat spreader. There is a common ground then in the system between the chassis, the PC board and the heat sink system.
This ground connection is very important for heat transfer and also for total device stability and current flow.
On the output side of the device, large PC board traces provide high power, high current connections to two
cross-connected 10 ohm coax line sections. These line sections form a 9:1 Impedance step and transform the very low
drain impedance up to about 25 ohms, balanced. A high current dc ferrite choke brings the 50 VDC to the drain sides of the
device. Various tuning, blocking and bypassing capacitors aid in the balanced tank circuits transition through a coax line to
a 50 ohms, unbalanced point. Following the tank circuit is a seven section low pass filter. The filter is followed by a high
power vacuum relay, the VSWR bridge and finally the output ‘N’ female connector.
6M-1K2 BLOCK DIAGRAM
OVERVIEW
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