K2 CW sidetone
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First, thank you for various responses (I get the digest so I don't see
responses until next day). Yes, my K2 is older, serial # 700. Yes, it began life as an awful tone. I did Randy's mods, but early ones. * It turns out that I have a 47 mh inductor, and I have ordered the now preferred 87 mh inductor, hopefully that will help. * I found Randy's original instructions from which I worked, and note that it is said to distort at sidetone frequncies below 530 cycles, and indeed, I had changed to 500 cycles, so that is part of it. It is recommended that I change C33 to 4.7 uf to reduce or eliminate low frequency distortion. * I also find the headfone in use has a LOT to do with how it sounds. Wide response headofnes sound terrible. Has anyone found sensitive headfones with more limited (not hi-fidelity) low impedance phones that do especially well with the K2??? 72, Fred kt5x / w5ya _______________________________________________ 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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Regarding headphones,
I can't report that I know of low fi headphones (since I already have lo fi ears) but I can report about a headphone set that truly "feels good" after **hours** of use and they are available just about everywhere. JVC Noise Canceling Stereo Headphones HA-NC100. http://img502.imageshack.us/img502/8522/dsc000101ko.jpg Comfort after hours of use is what amazes me but the bonus is: - they are reasonably inexpensive. - they are noise canceling (uses a single AAA) - the cord retracts! (wow) - they are light weight and fold up for travel Mine are a few years old now and they have not self destructed in the slightest so they appear to be reasonably durable even though they are just plastic and the cord is thin. Ken Lotts aa7jc -----Original Message----- From: [hidden email] [mailto:[hidden email]]On Behalf Of [hidden email] Sent: Friday, November 10, 2006 7:18 AM To: [hidden email] Subject: [Elecraft] K2 CW sidetone First, thank you for various responses (I get the digest so I don't see responses until next day). Yes, my K2 is older, serial # 700. Yes, it began life as an awful tone. I did Randy's mods, but early ones. * It turns out that I have a 47 mh inductor, and I have ordered the now preferred 87 mh inductor, hopefully that will help. * I found Randy's original instructions from which I worked, and note that it is said to distort at sidetone frequncies below 530 cycles, and indeed, I had changed to 500 cycles, so that is part of it. It is recommended that I change C33 to 4.7 uf to reduce or eliminate low frequency distortion. * I also find the headfone in use has a LOT to do with how it sounds. Wide response headofnes sound terrible. Has anyone found sensitive headfones with more limited (not hi-fidelity) low impedance phones that do especially well with the K2??? 72, Fred kt5x / w5ya _______________________________________________ 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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On Fri, 10 Nov 2006 09:08:09 -0700, Ken Lotts wrote:
>I can't report that I know of low fi headphones (since I already have lo fi >ears) but I can report about a headphone set that truly "feels good" after >**hours** of use and they are available just about everywhere. >JVC Noise Canceling Stereo Headphones HA-NC100. Quick question -- do they pass tones in the 100-200 Hz region (repeater "PL" tones which come through "hi-fi" phones)? -- 73 de K2ASP - Phil Kane Elecraft K2/100 s/n 5402 _______________________________________________ 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 Cloud Runner-3
Phil,
They are stereo phones meant for multimedia entertainment so yes they do pass tones in the 100-200 Hz region. Worth mentioning is that a simple homebrewed inline filter should easily cure that (for any headphone set). Ken Lotts aa7jc -----Original Message----- From: Phil Kane [mailto:[hidden email]] Sent: Friday, November 10, 2006 12:10 PM To: [hidden email]; Ken Lotts Subject: RE: [Elecraft] K2 CW sidetone On Fri, 10 Nov 2006 09:08:09 -0700, Ken Lotts wrote: >I can't report that I know of low fi headphones (since I already have lo fi >ears) but I can report about a headphone set that truly "feels good" after >**hours** of use and they are available just about everywhere. >JVC Noise Canceling Stereo Headphones HA-NC100. Quick question -- do they pass tones in the 100-200 Hz region (repeater "PL" tones which come through "hi-fi" phones)? -- 73 de K2ASP - Phil Kane Elecraft K2/100 s/n 5402 _______________________________________________ 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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