Jim, Thanks. I've seen and read your document previously. Is there something specific you are referring me to in your document that I already haven't covered? Let me recap and add a couple points of clarification:
* It's not an RF problem, as it still exists in TX TEST mode. * I do not have a hum/buzz problem. * I've used this setup on microphone inputs of other radios, no problem. (FT-920,990,1000) * I am using audio transformers. "Expensive" solution, but it's worked in the past. * I am using a ~20dB pad between the soundcard output and iso transformer. (5600/560ohm) * Duplicate 20dB pad/iso xfmr are on both channels, other channel driving FT-1000 no problems. Swapping L/R channels has problem follow K3, not cable. * I have 1.25" braid bonding K3>computer>FT-1000. * I can turn the soundcard output down very low (<20%), but I have to turn up the K3 MIC to get any power output. * Using my Heil headset directly into the K3, I use a MIC setting of 15 on SSB to get 5-6 bars ALC with 0 CMP. Using this same MIC=15 setting, I adjust my soundcard output so that both the Volume Control and Wave control are both 50%. At this setting, I have no ALC and <50W output power (with PWR set to 100). I can increase MIC to about 21, where I'll have nearly 100W output, but only 2 bars ALC. If I back of MIC only one step, to 20, I'll be one bar less than 100W, and only one bar ALC. If I increase MIC to 23, I get 3-4 bars ALC and the ticking noise. This seems very sensitive, and a difficult tradeoff between getting 100W output and having the ticking sound (which I'm guessing is some sort of clipping/distortion). Others have mentioned being able to use 5 bars ALC with AFSK RTTY. I can't get anything close to that. I'd like to reduce the MIC/ALC/output power tradeoff sensitivity. I've typically left the MIC gain alone on my rigs, and when running AFSK RTTY, I would adjust the soundcard output to get full ALC reading with no compression. It seems that I can't do that with my K3, only getting 2 bars ALC, and there's a fine line (about 2-3 'clicks" on the MIC gain) between full output power and ticking/distortion. So I ask again, is there some specific idea you'd like me to try that I haven't covered? Chad WE9V On Sun, Nov 23, 2008 at 3:19 PM, Jim Brown <[EMAIL PROTECTED]>wrote: > On Sun, 23 Nov 2008 11:37:17 -0600, Chad WE9V wrote: > > >Any ideas out there? > > Lots. > > http://audiosystemsgroup.com/HamInterfacing.pdf > > 73, > > Jim K9YC > > > > _______________________________________________ > Elecraft mailing list > Post to: Elecraft@mailman.qth.net > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com >
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