Thanks Don. I will do that very soon. Bruce - W8FU
-----Original Message----- From: Don Wilhelm [mailto:[EMAIL PROTECTED] Sent: Monday, May 12, 2008 7:19 PM To: Bruce McLaughlin Cc: [email protected] Subject: Re: [Elecraft] Tuning K3 with linear amp Bruce, Yes, do load the latest firmware. It does contain some ALC changes. 73, Don W3FPR Bruce McLaughlin wrote: > I am still exploring my new K3 (it's less than one week old. I discovered > an odd issue while tuning it with my Commander HF 2500 amp. With the ATU > off and the power lowered to about 3 watts I activated the tune function. > While watching the output on my Coaxial Dynamics wattmeter I gradually > raised the K3 output power while tuning the amp. When I got to around 13 > watts drive from the K3, the wattmeter was showing a carrier power of 1 KW > from the amp. The drive power of 13 watts indicated on the K3 was unusually > low for an indicated output of 1 KW carrier. When I then spoke into the > mike and flipped on the peak reading circuit on the watt meter, it showed > only 500 to 600 watts pep which was low in my experience. Usually with an > indicated carrier power of 1 KW I should at least get around 1400 or more > indicated peak power on modulation. I gradually increased the drive from > the K3 until the peaks showed 1 KW or a bit more. When I again checked the > output of the K3 it showed a bit more than 23-25 watts which is what I > usually get with my other radios. > > This behavior is different than my other radios. It appears to require a > low drive level to show 1 KW carrier output from the amp but with a low peak > reading. I suspect something is happening with the ALC but I'm not sure. I > should mention that I have yet to load any firmware updates. It has > whatever version it had when it left Aptos on May 2. Could that be a > factor? > > Bruce - W8FU > > -- No virus found in this incoming message. Checked by AVG. Version: 7.5.524 / Virus Database: 269.23.16/1429 - Release Date: 5/12/2008 6:14 PM _______________________________________________ Elecraft mailing list Post to: [email protected] 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
