[Elecraft] ICE 419 interface

[Dave Hachadorian]

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