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Pin Diode Attenuator For The Drake TR-7 Power Amplifier

Written By: Floyd Sense / K8AC


Here is an article written by Floyd Sense, K8AC, using the PA1HFO Pin Diode Attenuator in the Drake TR-7 Transceiver to provide a separate drive level adjustment to the PA Amplifier for each band.     Using this modification the drive level is better controlled providing an increase in power output on 10 meters without over-driving the amplifier on the lower bands.    Automatic band switching is provided from the Digital Control Board.   The article is in the Acrobat .PDF format and can be down loaded by clicking on the link below.

    Link to download Article


Band selectable PA drive level modification mount to the TR7 Mother Board.