After solving an Auxbus issue with the KPA100, I noticed the following. With no antenna, or a good dummy load, if the RF level is full counter clockwise and the AF full clockwise you get a perfectly acceptable level of audio hiss. However, as you advance the RF level to 12 O'clock a "bacon frying" noise starts to be perceptible. At full RF, full AF, it is quite distinct. I don't seem to recall the "bacon frying" noise before and it is low enough that band noise will blank it. Also, I rarely have the AF past 12 O'clock in operation, so it isn't apparent, but I also think that it shouldn't be there. Years ago I used to work on audio equipment and this sounds like a noisy resistor, but because it is coming out of the RF circuitry, it could be a few other things, too. First question. Would someone do a similar check on their K2 to see if this is inherent (i.e., am I chasing rainbows). Thanks in advance. Second, I'm starting to go through the schematics looking for suspects and will do a little testing when I get back home (on a business trip right now). If anyone has already experienced and addressed this, I would appreciate your information to jump start my tracing.
Thanks, Howard W1WF ***************************** This communication, including any attachments, is confidential and may be protected by privilege. If you are not the intended recipient, any use, dissemination, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please immediately notify the sender by telephone or email, and permanently delete all copies, electronic or other, you may have. To ensure compliance with requirements imposed by the IRS, we inform you that any tax advice contained in this communication (including any attachments) was not intended or written to be used, and cannot be used, for the purpose of (i) avoiding penalties under the Internal Revenue Code or (ii) promoting, marketing or recommending to another party any transaction or matter addressed herein. The foregoing applies even if this notice is embedded in a message that is forwarded or attached. ***************************** _______________________________________________ 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
