K2/100 #4001
Locked
 
|
Since building the 100 watt add on, I have been venturing into a bit of SSB.
The mic jack is wired for Kenwood and the mic I'm using is a hand mic that came with the TS 570, a dynamic with 600 ohm impedance. I don't think the ALC (Talc) action is working properly. With the mic gain set at 3 and the compression ratio at 4-1 the ALC lights up 3 bars. These settings are extreme and the on the air audio is "Breathy" with lots of background noise. Not good. But, even at these extreme settings, power-output seems low and restrained. I've tried every possible combination of mic gain/compression. On the low end, mic at 1 and compression off, there is no indication of ALC on the bar and the power indication is very low. Only with the power set to 0.01 does the ALC respond at a sensitivity that seems appropriate with the mic set at 1 and compression off. I'd like to hear from others what their experience is with various mics and mic settings, troubles and remedies, etc. Thanks, Bill - W7WEL _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
|
|
Bill, W7WEL wrote:
Since building the 100 watt add on, I have been venturing into a bit of SSB. The ...mic I'm using is a hand mic that came with the TS 570, a dynamic with 600 ohm impedance. I don't think the ALC (Talc) action is working properly. With the mic gain set at 3 and the compression ratio at 4-1 the ALC lights up 3 bars. These settings are extreme and the on the air audio is "Breathy" with lots of background noise. Not good. But, even at these extreme settings, power-output seems low and restrained. I've tried every possible combination of mic gain/compression. ...I'd like to hear from others what their experience is with various mics and mic settings, troubles and remedies, etc. ---------------------------------- Bill, if your ALC is flickering even one bar, you are hitting the full peak output you have the POWER control set for. MIC 2 and MIC 3 are identical gains. Only MIC 1 is different. It inserts about 10 dB of gain. The number of ALC bars lighting only indicates how much gain reduction the AGC has to use to hold the output power down to your requested level. More or less bars do not mean more or less output as long as at least one bar is flashing. The presence of a lot of background noise suggests that you have plenty of mic gain anyway - assuming that's what others are hearing with nominal signal strengths. Background noise will sound much louder on a nearby monitor receiver because of the huge signal level at such close range. I'm not real sure what you mean by "restrained" but one thing a lot of ops with K2's on SSB miss is that note in the KSB2 manual to adjust the BFO frequencies for best reproduction of your voice. Setting them by Spectrogram gets them close enough for a lot of ops, but there's nothing like actually hearing your own signal. If you can, listen on an auxiliary receiver and record it, then play back the recording. You may find that shifting the BFO frequency a bit one way or the other will do a lot to improve the quality of your audio beyond the basic setting looking at Spectrogram. Ron AC7AC _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
|
|
AARGH!!
Mic 1 inserts about 10 dB of ATTENUATION, not gain. Where's my egg-nog refill??? Happy Holidays to you all! Ron AC7AC -----Original Message----- --------------------------------- Bill, if your ALC is flickering even one bar, you are hitting the full peak output you have the POWER control set for. MIC 2 and MIC 3 are identical gains. Only MIC 1 is different. It inserts about 10 dB of gain.... _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
|
|
In reply to this post by bill linn
On Fri, 2004-12-24 at 11:09 -0800, bill linn wrote:
> Since building the 100 watt add on, I have been venturing into a bit of SSB. > The mic jack is wired for Kenwood and the mic I'm using is a hand mic that > came with the TS 570, a dynamic with 600 ohm impedance. Hi Bill, I did exactly the same thing when I first used the K2 on SSB. I had to play around a bit to get it right. First, I changed R14 on the SSB module from 1K to 5K6. This makes more of a difference than you think, try it. Secondly, grab a Heil insert and fit it into the mic housing instead of the one Kenwood put there. I use the HC5. Then, as has been suggested, run OP1 through spectrogram to centre the filter. I would also do the 2.4kHz bandwidth mod on the SSB board, it is only a few capacitors. I did all of this and my audio gets lots of unsolicited compliments. In fact, someone told me the other day that the quality was as good as my wifes when she was on the 1000MP using a desk mic! I suspect my voice was a little deeper however ;-) The ALC will look exactly the same after all of this but you will see a higher average output without having to be right up to the mic. Happy Christmas and have fun! Ian -- Ian Maude G0VGS Morecambe Lancs UK | [hidden email] Sysop of GB7MBC, the Morecambe Bay Cluster Running Linux and DXSpider | K2 #4044 Find out about Summits on the Air! Visit the SOTA web site at http://www.sota.org.uk _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
«
Return to Elecraft
|
1 view|%1 views
| Free forum by Nabble | Edit this page |