N546RV
Well Known Member
OK, so I've done a ton of searching and read a bunch of posts here on this topic, and I'm 95% sure I have the right idea, but the other 5% of my brain simply won't shut up. The question regards how to wire the PTT switch; in this specific case, it'll be for a Dynon intercom.
From what I've read in many, many other threads, the PTT switch works by simply pulling an input on the intercom (and, by extension, the radio) to ground. Which of course means that the wiring need only consist of a single conductor starting at the PTT input, going to the PTT switch (in the stick grip in my case), and then to ground.
This setup would greatly simplify my wiring, as opposed to the schematic provided by Dynon, in which the PTT switch closes a circuit between the tip and sleeve on the pertinent mic jack (see attached photo). This diagram passes the sniff test, since closing the switch is connecting the PTT input to the mic ground.
I suppose my question is this: if the PTT input need only be grounded, why depict this comparatively complex setup in the manual? In particular, why use the tip on the mic jack for the PTT input? I presume the tip contact serves no other function in that jack?
Thank you all in advance for hopefully assuaging tonight's electrical anxiety.
From what I've read in many, many other threads, the PTT switch works by simply pulling an input on the intercom (and, by extension, the radio) to ground. Which of course means that the wiring need only consist of a single conductor starting at the PTT input, going to the PTT switch (in the stick grip in my case), and then to ground.
This setup would greatly simplify my wiring, as opposed to the schematic provided by Dynon, in which the PTT switch closes a circuit between the tip and sleeve on the pertinent mic jack (see attached photo). This diagram passes the sniff test, since closing the switch is connecting the PTT input to the mic ground.
I suppose my question is this: if the PTT input need only be grounded, why depict this comparatively complex setup in the manual? In particular, why use the tip on the mic jack for the PTT input? I presume the tip contact serves no other function in that jack?
Thank you all in advance for hopefully assuaging tonight's electrical anxiety.