Cyclone 40 Design Updates and Kit Changes

MODIFICATION NOTE 2:

Purchasers of the original version PC boards (no revision notice printed on the boards) may find that there is insufficient adjustment range in the OFFSET pot, R16, to line up the transmit and receive frequencies. The following modification may be used to correct this.

Twist two 2" pieces of #26 enameled wire (~ 5-8 tpi) to make a gimmick capacitor and solder it to pins 14 and 15 of U1. It will be trimmed to the proper length so as to facilitate adjusting the receiver offset. Set the offset pot in mid-range BEFORE you prune the gimmick cap. Also, attach the bottom cover BEFORE you trim the gimmick to length.

NOTE: the offset pot changes the RECEIVE frequency NOT THE TRANSMIT (very, very little interaction if any). The pot does not have a stop, so use an ohmmeter to find the center, or count turns.

This mod will bring the PTO transmit/receive offset into a range where the OFFSET pot is useful.


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