Drake Modification

A popular way to receive 2.4 GHz signals (as used by AO-40's S2 transmitter) is by use of any one of a number of MMDS downconverters. These units must typically be modified to change their downconverted frequency range to match that of the user's 2 meter receiver.

Here are some pictures from when I modified my Drake downconverter.

Here's the Drake, open
but unmodified

Corrugated section removed

Shield removed

Inside view. Crystal on lower left to be changed.

Need to unsolder connector at upper right

Board removed, underside view

New xtal on left, old xtal on right

New xtal soldered in

Remove couple coils and capacitors

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