Hi friends: I faced a similar problem of low out power on ssb. On my specific case the problem was the configuration of the FL1 FRQ configuration. You must check on the filter (2,7Khz) what is the offset On my case is -0,91. If you make a configuration out of the offset freq the output power will be much lower. Best regards Oms PY5EG
-----Mensagem original----- De: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] nome de Stewart Baker Enviada em: terça-feira, 29 de abril de 2008 13:53 Para: David Yarnes; Mike Penkas; elecraft@mailman.qth.net Assunto: Re: [Elecraft] K3 low PEP Power on SSB The real key is using an external audio generator into the mic input and seeing what comes out the other end using an oscilloscope. This removes all the issues with microphones and their setup. I agree that antenna matching can make quite a difference to the results, that is why I took the time to build an accurate dummy load consisting of 30 1.5k 2W 1% tolerance metal film resistors. Measuring the load on a VNA (Vector Network Analyser) shows worst case 1-30 MHz VSWR as 1.05. So that should be good enough. In real terms the variations seen in the Peak SSB TX signal are insignificant at the other end of a QSO, however if my old TS850S can get it right, I expect the same from my new K3. Y.M.M.V 73 Stewart G3RXQ On Tue, 29 Apr 2008 09:37:37 -0700, David Yarnes wrote: > Hi All, > > I've been watching this thread and wondering if there truly is a problem. > It seems to suggest there is, and Elecraft says they are looking into it > with a firmware update pending. But I can't help thinking that there are so > many reasons why the problem could just possibly be in the setup. The > variation in reports seems to suggest this could also be an issue. For one > thing, if the antenna isn't correctly matched, I would think there would be > some foldback. But if you are getting full output on CW, you should get > that on SSB as well. But full output on SSB isn't that easy to observe. > You may well be getting full output on SSB, but your meter won't necessarily > disclose that. This has been pointed out before. I also wonder if the > microphone settings are correct. You may think some microphone gain > setting, 10 for example, is sufficient, but just possibly it needs 12 or 15? > Just a thought. > > Another thing could be the microphone itself. In Mike's situation > (discussed by him below) for example, he indicates that he took a stock > microphone from his Kenwood TS-2000 and hooked it up. I assume he is > assuming that there is total compatibility with Kenwood microphones. I > don't know if that microphone is an electret, but if it is, I'm not sure it > really is totally compatible. The standard Kenwood wiring has the 8 volts > or so on a different pin than the Elecraft uses. I think the Kenwood is pin > 5, and the Elecraft is pin 6--or maybe I have that backwards. But there is > a difference. > > I'm only suggesting these things as a possibility--for all I know everyone > has fully considered all these issues and dealt with them correctly. In my > case, I am using the Elecraft Pro Headset (electret) via the back > connectors. As far as I can tell, I'm getting full output on SSB. The only > exception to that seems to be on the higher portion of 40 meters, where I > don't seem to be able to get quite 1:1 through the tuner. My antenna is set > for the CW portion, and so I get about 1.3 to 1 up near the high end. It > seems my SSB output is down somewhat when I operate there, but only > slightly. This is based on the RF output indication on the K3 itself. I > may be making an erroneous assumption, but I attribute that to not being > exactly matched. My reports, though, are good. > > Dave W7AQK > ----- Original Message ----- > From: "Mike Penkas" <[EMAIL PROTECTED]> > To: <elecraft@mailman.qth.net> > Sent: Tuesday, April 29, 2008 7:58 AM > Subject: [Elecraft] K3 low PEP Power on SSB > > > I disconnected all my outboard audio gear on the K3 and connected > an Array Solutions Powermaster Meter and dummy load directly to > the K3. With the K3 set to 120 watts my keydown RF output on > 20 meters reads 116 watts. > I connected a stock hand mic that came with my Kenwood TS-2000 > to the front mic connector set to High. > With Mic gain set to 15 and comp to 0 and all equalizer settings at 0 > I show a max of 75 watts. > With the compressor turned on to a setting of 18, I show peaks of > 110 watts with alc flickering between 3 and 5 bars. > Monitored audio on a second receiver is very clean. > Mike WA8EBM > _______________________________________________ > 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 > > _______________________________________________ > 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 _______________________________________________ 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 _______________________________________________ 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
