[SMCARA] Mic switch

[Tom]

Why 8 poles?  Typically all you need is Receive Audio, Transmit Audio, 
PTT, and Ground. You  will notice in the SLUSB there are 8 jumpers, but 
not the lines all are needed.  I built a switch into my console using a 
3PDT toggle and it works fine. The other lines are up/down tuning, 8 
volts (or so), squelch, and perhaps discriminator out (used for 9600 
baud packet-n/a here).  Hard wire those from mic jack to radio plug and 
switch the RXA, TXA, and PTT lines only.

Plan B:  Take an old serial port or printer port switch and use it. Just 
wire up some DB-25/DB-9 plugs for the needed lines.   A few minutes with 
a VOM will identify the pins to use or Google RS-232 pin definitions.

I'm leaving in the morning for a trip, but will look to see if I have a 
toggle switch lurking in the junk box.

73 Tom/W4OKW
Dedicated to making solder smoke!

On 7/5/2015 2:02 PM, Jason Rearick wrote:
> Chris, I did some digging on the net, and found some plans to switch 
> for two mic input to one output.  It would be pretty easy and I could 
> help you make it since I have an iron and wire here.  The only problem 
> is a switch to handle that many positions is about $50-$65.
>
> So that said, does anyone out there have a switch that they wouldn't 
> mind parting with?  Need a two position switch with 8 poles.
>
>
> Lets see if we can part this together?
>
>
>
> N3YUG
> Jason Rearick
>
>
>
>
> -----Original Message----- From: Chris Ordiway
> Sent: Saturday, July 04, 2015 4:10 PM
> To: smcara at mailman.qth.net
> Subject: [SMCARA] Mic switch
>
> Howdy all,
>
> I posted a question on a ham radio Facebook group earlier but hope I
> might get a more productive answer here. Apparently people on Facebook
> don't read...
>
> I'm picking up a SignaLink for my Kenwood TS-430S and don't want to have
> to keep swapping cables to do digital and phone. I'm looking for a
> simple A/B microphone switch for 8 pin round connectors that doesn't
> cost an arm and a leg and have unnecessary extra features. Like an old
> 2-port VGA switch circa 2000. The $100 switches from MFJ are entirely
> more than I need.
>
> And before anyone suggests "just build your own", I thought of that. I
> appreciate the confidence you have in my abilities but... For the cost
> of the soldering iron I don't own yet and the multiple bits and bobs
> that I'll destroy trying to make one I might as well just give my $100
> to DX Engineering. I'll get to the point of building my own but it's not
> today. :)
>
> And maybe a Soldering 101 for Dummies (like me) class would be a good
> club activity some time.
>
> So, any thoughts?
>