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0dB to -130dB RF Attenuator
August 2007

This is as easy as it gets! Making use of the attenuators and BNC connectors out of a scrap HP 8443A Tracking Generator Counter and fitting them into an instrument case. The hardest part was finding a SMB male to male adaptor (thanks Francois) to join 2 coax cables together. One attenuator is marked +10dB to -110db in 10db steps and the other attenuator is marked 0dB to -12dB in 1dB steps. The actual attenuation is 0dB to -130dB of course!

RF Attenuator
The 2 attenuators and 2 BNC connectors just fit into an instrument case which is of similar dimensions to the HP 8447D RF Amplifier and HP 435B Power Meter.

The frequency bandwidth of the 8443A is 100kHz to 110MHz, although these attenuators have a far wider bandwidth and have been used up to 1.3GHz.

I still need to measure the bandwidth / attenuation characteristics accurately when the necessary test equipment is repaired and calibrated. Also one of the BNC connectors includes a dc blocking capacitor, I will remove this when I find a spare BNC to SMB cable.