Hi Don, That info was in the email chain until your response trimmed down the message. :-)
I am using an (older) Icom HM-36 mic (and have tested with two Heil headsets with similar results). The menu is set to: SSBA=3 and SSBC=4-1 I also indicated that I had tested (during my original testing) with a modulated CW signal from the computer as well with similar results... the SSB audio is very low. You had asked two other questions in the original email chain: The K2 S/N is 6119 and the SSB board was bought and assembled a couple of years ago. Looking at the schematic I am not seeing much in the way of adjustments on the SSB circuit beyond the the compression at the SSM2165 which controlled by the MCU. A pre-amp is a kludgy solution IMO. (It might be ok to use it for a quick test to see if that is the problem.) Thoughts? Guidance from anyone else with a K2+HM-36 ? Thanks, JH -- John Hoaglun NG0R - EN25 http://www.hoaglun.com On Sat, 2011-01-22 at 23:03 -0500, Don Wilhelm wrote: > John, > > Welcome back. > > What microphone are you using? And what is the compression set at? > > In my experience, the K2 SSBC parameter should be set at 2:1 or higher > (I actually prefer 3:1) no matter what the microphone. The SSBA menu > parameter will (of course) depend on the microphone being used - SSBA = > 1 for high output microphones and either SSBA = 2 or 3 for low output > microphones). > > Bottom line - I would look at the mic levels first. If the compression > level does not even things out, then perhaps a microphone preamplifier > may be in order. If the mic is one using the Heil HC4 or HC5 element, > those are low output microphones and may need a pre-amp. Those > microphones with an electret element have high level output (like the > Elecraft MH2, MD2 or ProSet-K2) and do not need increased mic gain. > > 73, > Don W3FPR > > On 1/22/2011 10:29 PM, John Hoaglun wrote: > > Hi Don& list > > > > Now that I am back from my business trip I am able to get back to the > > work bench. > > > > I put the K2 on the work bench tonight to run the test: > > K2+20dB directional coupler+20dB pad : running @ 7.04mhz at 2w > > > > CW vs SSB is about a 3dB difference on my Booton microwatt meter. > > > > My oscope was showing a similar result. > > > > The SSB levels appear to be down which is consistent with what I saw > > last weekend when I was looking at this. It does not appear to have > > anything to do with the transverters. > > > > Any suggestions on where to look in the SSB or ALC circuits or someplace > > else? > > > > Thanks, JH > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
