Interestingly you can hear the tick even when in TEST mode. Fortunately it's hard to hear above the sidetone. I ordered the new DSP board so while I've got the covers off I'll dig around for the noise again. I need something better than tubing in the ear. Steve N4LQ [email protected] ----- Original Message ----- From: "Paul Christensen" <[email protected]> To: <[email protected]> Sent: Thursday, December 10, 2009 5:53 AM Subject: Re: [Elecraft] [K3] RE: K3: Relay noise?
>I recently ran into a similar issue when interfacing an Ameitron QSK-5, K3, > and SPE 1K amplifier. Regardless of power through the QSK-5, it produces > an > audible "tick" when keying. Yes, there are two relays inside the QSK-5 > unit, but neither is the cause. > > It turns out that the QSK-5's PIN diodes are being biased with moderately > high voltage. The ticking sound follows the application of diode bias. I > could swear it was the input signaling relay when I tried to localize the > sound. Only, the PCB is functioning as an acoustical sound board (akin to > a > piano or violin), amplifying the "tick" produced by the biasing of the PIN > diodes. I still don't know the exact ticking mechanism. > > I've heard similar effects when using high-voltage transistors. Anyone > who > has worked extensively with these transistors or high-power PIN diodes > care > to add an explanation? > > Paul, W9AC > > > ----- Original Message ----- > From: "AC7JW" <[email protected]> > To: <[email protected]> > Sent: Thursday, December 10, 2009 12:40 AM > Subject: [Elecraft] [K3] RE: K3: Relay noise? > > >> >> Thanks Steve. >> >> It's sure strange that I get the same click whether I run 1 W, or 100 W. >> I >> could understand some sort of residual magnetic effect (for lack of a >> better >> term) causing some mechanical movement to create the noise if it was only >> present while running high power, in which case high currents are >> present, >> and thus the potential for a powerful magnetic field. But at 1 watt- >> there >> is something else going on. In any case, I don't think it's a problem- >> just >> an annoyance. >> >> Jason >> >> >> >> From: Steve Ellington [via Elecraft] >> [mailto:[email protected]] >> Sent: Wednesday, December 09, 2009 8:57 PM >> To: AC7JW >> Subject: Re: K3: Relay noise? >> >> >> >> I used some plastic tubing stuck in one ear trying to track it down. I >> narrowed it down to one relay but it's been at least 6 months ago and I >> can't recall which one made the noise. I had suggestions to check for >> loose >> ferrite chokes along the high current DC line but that wasn't the source. >> If >> >> I happen to remember which relay it was, I'll post it here. 73 >> Steve >> N4LQ >> [hidden email] >> <http://n2.nabble.com/user/SendEmail.jtp?type=node&node=4143590&i=0> >> ----- Original Message ----- >> From: "AC7JW" <[hidden email] >> <http://n2.nabble.com/user/SendEmail.jtp?type=node&node=4143590&i=1> > >> To: <[hidden email] >> <http://n2.nabble.com/user/SendEmail.jtp?type=node&node=4143590&i=2> > >> Sent: Wednesday, December 09, 2009 9:40 PM >> Subject: Re: [Elecraft] K3: Relay noise? >> >> >>> >>> I've followed this thread concerning a QSK clicking noise through all >>> comments, as well as other similar threads on the list, but it doesn't >>> appear as if anyone ever came to a firm conclusion as to origin of this >>> clicking noise. As others have stated, I can hear a very faint >>> mechanical >>> clicking that follows my code when using QSK. It sounds like it's coming >>> from the KPA100 region, but I can't tell for sure. >>> Did anyone ever come to a conclusion, or receive any information from >>> Elecraft? >>> >>> Thanks- >>> Jason AC7JW >>> >>> >>> Steve Ellington wrote: >>>> >>>> Is there a mechanical relay that follows keying? I've had my K3 for >>>> nearly >>>> a >>>> year and didn't notice any relay noise until lately. I know the antenna >>>> TR >>>> is done by pin diodes but I can now hear the faint click of a small >>>> relay >> >>>> that wasn't there before. I'm using ver. 2.8 >>>> Steve Ellington >>>> [hidden email] >> <http://n2.nabble.com/user/SendEmail.jtp?type=node&node=4143590&i=3> >>>> >>>> ______________________________________________________________ >>>> Elecraft mailing list >>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>>> Help: http://mailman.qth.net/mmfaq.htm >>>> Post: mailto:[hidden email] >> <http://n2.nabble.com/user/SendEmail.jtp?type=node&node=4143590&i=4> >>>> >>>> This list hosted by: http://www.qsl.net >>>> Please help support this email list: http://www.qsl.net/donate.html >>>> >>>> >>> >>> -- >>> View this message in context: >>> http://n2.nabble.com/K3-Relay-noise-tp2269079p4143403.html >>> Sent from the Elecraft mailing list archive at Nabble.com. >>> ______________________________________________________________ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:[hidden email] >> <http://n2.nabble.com/user/SendEmail.jtp?type=node&node=4143590&i=5> >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >> >> >> >> ---------------------------------------------------------------------------- >> ---- >> >> >> >> No virus found in this incoming message. >> Checked by AVG - www.avg.com >> Version: 9.0.709 / Virus Database: 270.14.101/2555 - Release Date: >> 12/09/09 >> 14:41:00 >> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[hidden email] >> <http://n2.nabble.com/user/SendEmail.jtp?type=node&node=4143590&i=6> >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> >> >> >> _____ >> >> View message @ http://n2.nabble.com/K3-Relay-noise-tp2269079p4143590.html >> To unsubscribe from Re: K3: Relay noise?, click >> < (link removed) >> 6b25lLm5ldHw0MTQzNDAzfDM0MTY1ODI0MA==> here. >> >> >> >> >> -- >> View this message in context: >> http://n2.nabble.com/K3-Relay-noise-tp2269079p4143797.html >> Sent from the [K3] mailing list archive at Nabble.com. >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[email protected] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html -------------------------------------------------------------------------------- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.709 / Virus Database: 270.14.102/2556 - Release Date: 12/10/09 02:36:00 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
