On Mon Dec 1 5:08 , John Unger sent:
I am in the process of connecting my K3 to a Model 419 ICE
bandpass filter.
Does anyone have a circuit or schematic of how they
interfaced this filter
with the outputs on the ACC port on the K3, or do I need a
full-blown
solution like the KRC2 band decoder?
I'm pretty sure the ICE 419 requires a ground to pick up
each band relay. A W9XT band decoder, modified with four
2.2k pull-up resistors, one to each bcd input from 12vdc,
should do the job inexpensively. I mounted mine (two of them
actually) in a serial port switch box, which made a nice
cabinet and had DB-9's already mounted. I used serial cables
to hook the BPFs to the box, and the box to the K3s. On the
K3 end of the cable, whack off the DB9 and install a 15-pin
from Radio Shack. While you are fiddling with that 15-pin,
mount a little female connector on a short pigtail for FSK
keying. Serial cables are nice. They have 4 twisted pairs.
Tie one side of each pair to ground and use the other 4
wires in the pairs for signal. You can get cables and
probably the switchbox at www.monoprice.com , which is a
great place to buy cables and connectors.
Dave Hachadorian, K6LL
Yuma, AZ
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