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For a permanent solution to the keyer EMC problem, install a short ground wire inside the radio. Here is how I did it:
Remove the top cover (9 screws; be careful not to lose them, as they are small).
Slowly lift up the cover (not too far) and unplug the "keyed" speaker-wire connector from the circuit board.
Facing the front of the radio look at the rear panel, at the left side of the radio. You will see the 1/4 inch black plastic key jack soldered to the circuit board.
On the key jack there is the numeral 2 stamped sideways into the plastic. Opposite the base of the 2 (left side of the jack) you will see a metal tag in the plastic; this is the "ground" of the key jack. The tag just slightly protrudes above the plastic.
Carefully solder (not too much heat) a short wire (insulated to prevent shorting to other components) to the metal tap and wrap the other end of the wire under the "chrome screw" which holds down the circuit board. The chrome screw is easily seen; it is about 1 inch away from the 1/4" key jack and to the left of the jack. (Refer to Figure 1 above.)
Reconnect the keyed speaker-wire connector to the circuit board and fasten down the top cover with the 9 screws. Done!
Note the RF choke (1000µh) soldered to the centre pin of the key jack.
This is my method of interfacing a CW generator (the excellent K-20 CW Keyer) through the ACC jack. The other end is soldered to
pin 7, which is the only available NC pin on the ACC jack.
Dietmar VE3CG
Contents copyright © 2004 Dietmar Fichter VE3CG. All rights reserved.
Page created by A. Farson VA7OJ/AB4OJ.
Last updated: 06/09/2006.
