Hi Dave, Rather than switching all eight lines (so you might be able to use a cheaper and easier to wire switch) I'd look at which lines are used for what purpose, and make some intellegent decisions about what you're using, and what needs to be switched. For example, you shouldn't need to switch any ground connections. You probably don't need to switch the PTT connection, though if you key the wrong mike, (except on AM/FM) you won't get any power output. If you don't use the up/down functions then they don't need to be connected. If you can get your list of required connections down to 3 or 4, depending on the switch, it could be a single-deck switch. Or you may only find a switch with 12 (or 6) positions, but the ability to put a "stop" in the switch, to limit rotation. That switch will have more decks, with some (to many) terminals unused. You'll also want to consider whether RF suppression will be needed - such as if you use a plastic enclosure, which (unless it's sprayed with shielding paint) will lack shielding, and could create an RF feedback problem for you. Just things to consider. Unless you like learning the hard way! <grin>
73, Bob, KD7NM -----Original Message----- From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Dave 'Doc' Corio Sent: Monday, June 16, 2008 2:20 PM To: digitalradio@yahoogroups.com Subject: Re: [digitalradio] Re: Microphone putting audio into PSK transmissions Well, my plan is to use two 8-pin mic jacks on a small enclosure, with an 8-wire line out to the mic input of the 746. A rotary wafer switch with 8 poles and three positions should allow me to switch between the hand-held mic, the headset mic, or a blank position coresponding to "no mic". When I'm going to run digital modes, I'd simply select the "no mic" position so that room audio doesn't get transmitted. In either of the other two positions, for SSB operation, all pins would be active on the selected mic, and PTT, audio, and controls should be functional. I don't see that as being sloppy at all. Tnx es 73 Dave KB3MOW expeditionradio wrote: > > To mute the mic audio, you only need to short the microphone hot pin > to ground. A simple single pole single throw switch (normally open) > will work. However, you will need to manually switch it each time you > transmit... and perhaps that is rather sloppy station control. > > Bonnie > > --- In digitalradio@yahoogroups.com > <mailto:digitalradio%40yahoogroups.com>, Dave 'Doc' Corio <[EMAIL PROTECTED]> > wrote: > > I guess unless someone tells me that a rotary wafer switch won't do > > the trick for me, I'm going to try to build one. > > > > Tnx es 73 > > Dave KB3MOW > > > > > CLICK HERE TO VIEW THE MOD: > > > http://hflink.com/icom/microphone/hm36/ > <http://hflink.com/icom/microphone/hm36/> > > ------------------------------------ Announce your digital presence via our Interactive Sked Page at http://www.obriensweb.com/sked Check our other Yahoo Groups.... http://groups.yahoo.com/group/dxlist/ http://groups.yahoo.com/group/contesting http://groups.yahoo.com/group/themixwgroup Yahoo! Groups Links
