Sidetone with harmonics at 400 Hz...
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Sidetone with harmonics at 400 Hz...
 
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I have a K2, serial #2289, that has a second harmonic in the sidetone. The
sidetone is set for 400 Hz because I do much better with lower pitches. The sidetone at 400 Hz has a definite square wave sound to it. The problem certainly is not present at 600 Hz, and I don't even want to try 500 Hz. I'd go lower than 400 Hz if the K2 allowed it. I talked to Don Wilhelm about this and he seemed puzzled. There is a post off of the Elecraft web site about this at http://www.qsl.net/ve3mcf/elecraft_reflect/K2_Sinewave_Sidetone.txt. But that thread is dated Winter 2000. I would think the K2 has gone through enough evolutions to correct this. Perhaps not? Has anyone had this problem and corrected it? The sidetone is useable but annoying. It also makes zero beating a signal a lot harder. 73, Steve N6VL _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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A pure square wave has only the fundamental and odd harmonics.
If the sidetone is produced by passing a squarewave through a multistage low pass filter designed for a higher frequency, a lower sidetone frequency will indeed have a proportionally higher level of odd harmonics present. 73 jim ab3cv _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
Re: Sidetone with harmonics at 400 Hz...
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In reply to this post by Steve Kallal
Hi Steve:
Sometime between s/ns 2888 and 3442 that I built, there was a mod to the sidetone circuit that added on the control board an inductor (now L1 82mH) and a resistor (R11 47K) to "round off" the square wave. I do not know if that was included in the major mod to bring up pre 3000s to the latest mods. I think it is called the K2ATOBKT. I do NOT recall any complaints specifically like the 2nd harmonic problem when set at 400 Hz. 73, Ken Wagner K3IU Steve Kallal wrote: > I have a K2, serial #2289, that has a second harmonic in the sidetone. The > sidetone is set for 400 Hz because I do much better with lower pitches. The > sidetone at 400 Hz has a definite square wave sound to it. The problem > certainly is not present at 600 Hz, and I don't even want to try 500 Hz. I'd > go lower than 400 Hz if the K2 allowed it. > > I talked to Don Wilhelm about this and he seemed puzzled. There is a post > off of the Elecraft web site about this at > http://www.qsl.net/ve3mcf/elecraft_reflect/K2_Sinewave_Sidetone.txt. But > that thread is dated Winter 2000. I would think the K2 has gone through > enough evolutions to correct this. Perhaps not? > > Has anyone had this problem and corrected it? The sidetone is useable but > annoying. It also makes zero beating a signal a lot harder. > > 73, > > Steve N6VL > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > 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: [hidden email] 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 |
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In reply to this post by Steve Kallal
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Re: Sidetone with harmonics at 400 Hz...
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In reply to this post by Steve Kallal
I find the square wave character of the stock sidetone quite annoying on
my K2 #5004, with the sidetone set at 500 Hz. However I run the audio through a SCAF-1 external audio filter, which makes the sidetone much more of a single tone, and far more pleasant to my ear. The SCAF-1 also eliminates the high-frequency hiss in my headphones. The hiss didn't seem like a big deal, until I could make it go away; then I realized how much it had been bugging me. More information on the SCAF-1 is available here: http://www.idiompress.com/scaf-1.html The Standard Disclaimer does not apply... 73, - Rob W7GH On Sat, 04 Aug 2007 10:25:07 -0700, Steve Kallal <[hidden email]> wrote: > I have a K2, serial #2289, that has a second harmonic in the sidetone. > The > sidetone is set for 400 Hz because I do much better with lower pitches. > The > sidetone at 400 Hz has a definite square wave sound to it. The problem > certainly is not present at 600 Hz, and I don't even want to try 500 Hz. > I'd > go lower than 400 Hz if the K2 allowed it. _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
Re: Sidetone with harmonics at 400 Hz...
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Ho Rob:
If you are getting a square wave out of your sidetone, then you probably have a problem someplace. I just put the sidetone from 5413 on the scope and is shows an almost perfect sine wave. 73, Ken Wagner K3IU Rob Locher W7GH wrote: > I find the square wave character of the stock sidetone quite annoying on > my K2 #5004, with the sidetone set at 500 Hz. However I run the audio > through a SCAF-1 external audio filter, which makes the sidetone much > more > of a single tone, and far more pleasant to my ear. The SCAF-1 also > eliminates the high-frequency hiss in my headphones. The hiss didn't > seem > like a big deal, until I could make it go away; then I realized how much > it had been bugging me. > > More information on the SCAF-1 is available here: > http://www.idiompress.com/scaf-1.html > > The Standard Disclaimer does not apply... > > 73, > - Rob W7GH > > > > > On Sat, 04 Aug 2007 10:25:07 -0700, Steve Kallal <[hidden email]> wrote: > >> I have a K2, serial #2289, that has a second harmonic in the >> sidetone. The >> sidetone is set for 400 Hz because I do much better with lower >> pitches. The >> sidetone at 400 Hz has a definite square wave sound to it. The problem >> certainly is not present at 600 Hz, and I don't even want to try 500 >> Hz. I'd >> go lower than 400 Hz if the K2 allowed it. > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > 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: [hidden email] 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 |
Re: Sidetone with harmonics at 400 Hz...
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Hi Ken,
Thanks for the email. I've compared the sidetone from my K2 to the sidetone from several others, and mine is about typical. I don't doubt that my tone would look sinusoidal on a scope, since the harmonics are probably several dB down from the fundamental tone. However, they are there, they can be seen on Spectrogram, and they are annoying (to me at least, but not to Ron AC7AC). I also have a problem zero-beating with the stock tone, like Steve N6VL. The bottom line is that the audio from the SCAF-1 is much nicer, and I think that many other K2 users would think so also. 73! - Rob W7GH On Sat, 04 Aug 2007 11:47:25 -0700, Ken K3IU <[hidden email]> wrote: > Ho Rob: > If you are getting a square wave out of your sidetone, then you probably > have a problem someplace. I just put the sidetone from 5413 on the scope > and is shows an almost perfect sine wave. > 73, > Ken Wagner K3IU > > Rob Locher W7GH wrote: >> I find the square wave character of the stock sidetone quite annoying on >> my K2 #5004, with the sidetone set at 500 Hz. However I run the audio >> through a SCAF-1 external audio filter, which makes the sidetone much >> more >> of a single tone, and far more pleasant to my ear. The SCAF-1 also >> eliminates the high-frequency hiss in my headphones. The hiss didn't >> seem >> like a big deal, until I could make it go away; then I realized how much >> it had been bugging me. >> >> More information on the SCAF-1 is available here: >> http://www.idiompress.com/scaf-1.html >> >> The Standard Disclaimer does not apply... >> >> 73, >> - Rob W7GH >> >> >> >> >> On Sat, 04 Aug 2007 10:25:07 -0700, Steve Kallal <[hidden email]> wrote: >> >>> I have a K2, serial #2289, that has a second harmonic in the sidetone. >>> The >>> sidetone is set for 400 Hz because I do much better with lower >>> pitches. The >>> sidetone at 400 Hz has a definite square wave sound to it. The problem >>> certainly is not present at 600 Hz, and I don't even want to try 500 >>> Hz. I'd >>> go lower than 400 Hz if the K2 allowed it. >> >> _______________________________________________ >> Elecraft mailing list >> Post to: [hidden email] >> 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: [hidden email] 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 |
Re: Sidetone with harmonics at 400 Hz...
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In reply to this post by Ken Wagner K3IU
The sidetone mode to the K2 was an improvement but there appears to be an
artifact(s) on the tone itself.....not quite a thump but something on the sidetone when it is keyed......don't know quite how to describe it but I can hear it....but then I am VERY picky about sidetone purity and thumps and clicks (grin). One of these days when my tech bench clears I'm gonna put the K2 sidetone on my scope and take a look at it when keyed...perhaps I can see what I am talking about on the sidetone. The K2 sidetone is not as pure and "smooth" as the sinewave sidetone in my Argonaut V....there are no artifacts on the Argo V sidetone at all.....very pleasant to listen to. This is really my only nit to pick on the K2...the sidetone generation....the rest of the radio is superb and my favorite portable rig. The K3 I listened to at Dayton, courtesy of Wayne N6KR, generated a pure sinewave....very easy on the ears with no artifacts at all. Did I say that I can't wait to get my K3??? (huge GRIN) 73, Joe W2KJ I QRP, therefore I am _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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In reply to this post by Rob Locher W7GH
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Re: Sidetone with harmonics at 400 Hz...
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In reply to this post by Rob Locher W7GH
How does it compare to the BHI product?
http://www.bhinstrumentation.co.uk/ David G3UNA I have no pecuniary interest in either party ----- Original Message ----- From: "Rob Locher W7GH" <[hidden email]> To: "Elecraft Discussion List" <[hidden email]> Sent: Saturday, August 04, 2007 7:35 PM Subject: Re: [Elecraft] Sidetone with harmonics at 400 Hz... >I find the square wave character of the stock sidetone quite annoying on > my K2 #5004, with the sidetone set at 500 Hz. However I run the audio > through a SCAF-1 external audio filter, which makes the sidetone much more > of a single tone, and far more pleasant to my ear. The SCAF-1 also > eliminates the high-frequency hiss in my headphones. The hiss didn't seem > like a big deal, until I could make it go away; then I realized how much > it had been bugging me. > > More information on the SCAF-1 is available here: > http://www.idiompress.com/scaf-1.html > > The Standard Disclaimer does not apply... > > 73, > - Rob W7GH > > > > > On Sat, 04 Aug 2007 10:25:07 -0700, Steve Kallal <[hidden email]> wrote: > >> I have a K2, serial #2289, that has a second harmonic in the sidetone. >> The >> sidetone is set for 400 Hz because I do much better with lower pitches. >> The >> sidetone at 400 Hz has a definite square wave sound to it. The problem >> certainly is not present at 600 Hz, and I don't even want to try 500 Hz. >> I'd >> go lower than 400 Hz if the K2 allowed it. > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > 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: [hidden email] 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 |
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The SCAF-1 and the filters sold by bhi use different technologies. bhi
make DSP filters; the SCAF-1 is an analog bandpass filter with a variable high frequency cutoff. 73, - Rob W7GH On Sat, 04 Aug 2007 23:53:35 -0700, David Cutter <[hidden email]> wrote: > How does it [meaning the SCAF-1] compare to the BHI product? > http://www.bhinstrumentation.co.uk/ > > David > G3UNA > I have no pecuniary interest in either party _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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