K2: KSB2 Questions
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I am almost exclusively a CW guy but I did purchase the KSB2 option with my K2
for some soundcard digital modes. I finished the board almost a year ago but have never gotten around to installing it yet. (It's very hard to pull me away from CW!) Well I'm now thinking about installing it and I have a few questions... 1. I know that there is a rework eliminator that lets you easily change microphone configurations but that seems like overkill to me since I will probably never actually operate SSB after the initial testing. So a simple connector for the 16-pins of P1, wired up with the appropriate jumper connections, makes sense. But I don't know what kind of connector I need for this. A look at the Mouser catalog was overwhelming with the huge number of different connectors available! What kind of connector do I need to get? Is there any chance that I can find it locally at a Radio Shack or computer store instead of ordering it? BTW, an editorial comment - I'm surprised that Elecraft doesn't provide this connector with the KSB2! 2. This may be a silly question, but I would rather ask a silly question than make a silly mistake! Do the filter adjustments that I need to make for the KSB2 have any impact on the ones that I have already made for my CW work? I worked very hard to optimize those settings and I would really hate to mess them up! 3. Another possibly silly question. The ICOM microphone that I will be using requires a 10K bias resistor between the 5 volt and AF pins. Will this bias resistor have any impact on the connections that I will eventually need to make between my computer and the microphone jack for digital mode work? Thanks in advance for any information that you can share! 73, Paul - N8XMS ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Paul,
I just got back from three days vacation, and found 226 emails on the reflector! I finally waded through them and will attempt to answer a few, including yours. First, how to connect to the microphone configuration header - if you are wiring it for the Elecraft configuration, just use computer jumpers, all pins are connected "straight across" But, you said you were using an ICOM mic which is wired differently, so you have two choices, (1) rewire the microphone plug to match the Elecraft configuration, and tape over the Icom label so you remember it was changed (I recommend that because the microphone can then be used on the K3, and any Elecraft microphone can be used with the K2). (2) Leave the microphone plug as it is and wire the K2 mic configuration header for the Icom pinout. The best way to do that is using wire-wrap (if you have the tool and wire), and the second best is soldering wires between the correct pins. There is no plug for this connector, the header is designed to be wired directly. The only downside of soldering is that one cannot remove the soldered wires and go back to using the computer-type jumpers. Solder the bias resistor on the back of the microphone jack rather than trying to connect it at the configuration header. A value from 5.6k to 10k will work fine for most electret mics like the Icom and the Elecraft mics. one end of the resistor connects to the 5 volt mic jack pin and the other end connects to the AF pin. Yes, that bias resistor MAY cause some problems with the soundcard line-out for SOME soundcards. It would be wise to put a DC Blocking capacitor in the AF line of whatever soundcard interface you may use if there is not one there already. 73, Don W3FPR On 4/6/2011 10:14 AM, Paul Huff wrote: > I am almost exclusively a CW guy but I did purchase the KSB2 option with my K2 > for some soundcard digital modes. I finished the board almost a year ago but > have never gotten around to installing it yet. (It's very hard to pull me away > from CW!) Well I'm now thinking about installing it and I have a few > questions... > > 1. I know that there is a rework eliminator that lets you easily change > microphone configurations but that seems like overkill to me since I will > probably never actually operate SSB after the initial testing. So a simple > connector for the 16-pins of P1, wired up with the appropriate jumper > connections, makes sense. But I don't know what kind of connector I need for > this. A look at the Mouser catalog was overwhelming with the huge number of > different connectors available! What kind of connector do I need to get? Is > there any chance that I can find it locally at a Radio Shack or computer store > instead of ordering it? BTW, an editorial comment - I'm surprised that Elecraft > doesn't provide this connector with the KSB2! > > 2. This may be a silly question, but I would rather ask a silly question than > make a silly mistake! Do the filter adjustments that I need to make for the > KSB2 have any impact on the ones that I have already made for my CW work? I > worked very hard to optimize those settings and I would really hate to mess them > up! > > 3. Another possibly silly question. The ICOM microphone that I will be using > requires a 10K bias resistor between the 5 volt and AF pins. Will this bias > resistor have any impact on the connections that I will eventually need to make > between my computer and the microphone jack for digital mode work? > > Thanks in advance for any information that you can share! > > 73, > Paul - N8XMS > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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