Saturday, July 23, 2016

7dB Pad

This "pi" attenuator is for my Yaesu FT-450D transceiver. I wanted to be able to output at QRP levels but the Yaesu only goes down to 5W. This pad will handle up to 10W input and give me an attenuation factor of 5.


To test for proper operation, I attached a 50 Ω dummy load to the output connector and then applied 11.95VDC to the input connector.  The output side measured 5.36VDC which corresponds to 6.97dB of attenuation.  Pretty darn close!   Now I'll be able to operate in the 1-2W range.

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