I'm getting by without coax, using the wiring harnesses provided, but I did cut them reasonably short. ? On critical signals I twisted the signal wire with the associated ground wire, perhaps 1 or 2 turns per inch. ?Caps (signal to ground) on both ends of the tuning pot cable are a good idea. ?My antenna cable is about 2" long, I wouldn't want to go much longer without using coax. ?If you use coax, I'd ground the braid on both ends in all cases, the center conductor carries the signal. ?Something like RG178 coax is small and flexible enough. ?Should be able to extract pins from the connectors provided by pressing the springy metal tab at the wire end of the the rectangular window while gently tugging at the wire. ?Then you can solder RG178 directly to those connector pins.
I think a conservatively designed commercial rig might use coax for all of the signals below to avoid potential trouble. ?I'm listing them roughly in the order in which I'd consider them critical, opinions will vary. ?
? ? Main board DDS connector to Raduino
? ? Main board to tuning pot middle pin (and 0.1uF caps on both ends)
? ? Main board to antenna connector
? ? Main board to microphone
? ? Main board to volume control center pin
? ? Main board to volume control top pin
? ??
? ??
On Sat, May 13, 2017 at 01:01 pm, Thomas Noel wrote:
Where are the places that most benefit from shielded connectors linking components?
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