Hi Greg, It was not a problem with the prior firmware release. The new firmware seems to have some fiddling with the DSP code to make the audio mode "punchy". Makes you think. In my telecom engineering days (including running and maintaining commercial 11 metre dish Intelsat Std. "B" earth station) I always asked myself what was I doing before it went wrong. Something which has stood the test of time.
If I can set the audio levels so that there isn't any ALC indication, the same audio levels I was using successfully before the new firmware release, I rather think I'm not overdriving the TX. I will nevertheless keep an open mind and continue to experiment with levels. I have a JT65A 6M EME sked later today and fortunately the Acom 1000 can soak up the brief overdrive. A solid state amp might just go big time belly up. There are others taking an interest in this thread and I would be interested in anyone else's experiences. I am interested in discovering if Elecraft can replicate (or not) this occurrence. Simple fact is I guess , if it isn't broke, don't fix it. I didn't have any immediate need for the extras in the new firmware release so it was a mistake to upgrade at this stage. I would be interested in the correct way to revert to prior firmware releases and wait for service pack 3. Regards, Mike VP8NO ----- Original Message ----- From: "Greg - AB7R" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]>; "'Mike Harris'" <[EMAIL PROTECTED]> Sent: Monday, March 10, 2008 11:48 AM Subject: Re: K3 Power Overshoot Data A Mike, Please refer to the K3 operating tips page on the elecraft website. There's a section on setting up for PSK and other audio-based data modes. This sounds exactly like you are over driving the audio. Set your soundcard to about 20%. Set the radio PWR to what you want...try 40W. Then starting at zero, increase the MIC control (line-in) till you just get to 40W while sending PSK at idle. If increasing MIC goes over 40W, drop it back down so that it is just below 40W. Do that and you should no longer see any power spikes in DATA-A mode. Please let us know what you find. ------------------------- 73, Greg - AB7R Whidbey Island WA NA-065 K3#0009 and 0319 On Mon Mar 10 4:40 , "Mike Harris" sent: >Good day, > >I have installed the latest firmware and notice the following: > >At present I don't have PTT derived from the RS232 input and use VOX to >trigger the TX for Data-A. I notice that if for example the power is set >to 40W, when the VOX triggers there is a brief pulse of full power shown >on the RF meter there after it falls to the requested power. This is >confirmed by a similar pulse and recovery in the output of the linear. > >This is not 100% of the time, occasionally the power will set correctly >on >TX without overshoot. I tried another test this morning and on the first >TX it was OK, setting to 40W without overshoot, subsequently it briefly >hits 100W+ indicated. > >I have tried placing the K3 into TX mode before applying audio and the >problem still exists. > >I'm using JT65A, the line in level is set to LINE 5, no ALC. The level >from my sound card is at first bar from off on the Windows volume >control. >The same happens even with some ALC bars activated. I have made a number >of HF JT65A QSO's previously without this problem. Barefoot on HF this >wouldn't be an issue, though not good, however, it is a very big issue >when driving my Acom 1000 to full power for 6M EME. > >Can this be replicated? > >This was not apparent until I installed the latest firmware. > >Regards, > >Mike VP8NO > -- Internal Virus Database is out-of-date. Checked by AVG Free Edition. Version: 7.5.516 / Virus Database: 269.21.2/1305 - Release Date: 29/02/2008 18:32 _______________________________________________ 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
