Yamaha CM500
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Ok,then because you don't like and I love it,do you want to sell it to me ?
AD4C "If freedom means something,it is the right to tell others what they don't want to hear" –George Orwell --- On Mon, 1/10/11, ab2tc <[hidden email]> wrote: From: ab2tc <[hidden email]> Subject: Re: [Elecraft] RES: Yamaha CM500 To: [hidden email] Date: Monday, January 10, 2011, 8:38 PM Hello again, I am not talking about anything above 2700Hz at all. With my receive bandpass set to 300-2700Hz the CM-500 sound definitely muffled compared to any other headphones I have. Yes, I could compensate with the EQ, but then it would be unuseable with any other headphones I have since there is no macro support to quickly change the RX EQ settings quickly. Until that happens the CM-500 stays shelved in my shack. AB2TC - Knut AD4C2009 wrote: > > Lack of highs? Not mine,besides,does any ham transmit today with more than > 4000Hz at the high end? answer is NO,most of them are below 3000Hz,at that > freq ANY headset will response well.Also I injected an audio generator to > my CM-500 from 20 to 5000Hz and I heard the tone from 60(my ears) all the > way up to 5000Hz with same level,I don't see why they has "lack of > highs".Besides the K3 has an excellent RX EQ and you can tailor the > received audio to your personal taste so If you think it has too much > lows,then cut them up with it. > I have been using those Yamaha for more than a year and for me they sound > as well as ANY other headset. Maybe some users feel bad because they are > "cheap" compared with Heil, Senhisser,and others. > > AD4C > <snip> > -- View this message in context: http://elecraft.365791.n2.nabble.com/Yamaha-CM500-tp5750572p5908494.html Sent from the [HAM] 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] 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Kok Chen
On Jan 10, 2011, at 3:35 PM, Wayne Burdick wrote: > The effect on transmission bandwidth is negligible, and it's also extremely unlikely to affect copy. Hank W6SX had written to ask me for a rough guess of transmission bandwidth when there is a 1 dB difference in level between mark and space carriers. A rough guess turned out to be relatively easy and the bottom line is that the far off QRM is only about 10 dB down from a phase NON-continuous case of FSK generation, if the mark and space signals are different by 1 dB. Basically, about 10 dB down from the first plot in this web page: http://homepage.mac.com/chen/Technical/FSK/Sidebands/sidebands.html The ideal FSK phase continuous signal should look like the second plot on that page. So, forget about phase noise! Your FSK keying sidebands are going to be a much bigger problem for your nearby neighbors :-). I think that a judicious choice of tone pairs could help, but it is a band-aid, not a technical solution. 73 Chen, W7AY ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by AD4C2009
Hector,
I too love my CM-500 but then I set the RX EQ to suit and I don't have a 'collection' of headsets...certainly would not waste money on Heil gear...too rich for my blood and they are not real robust. Also found with the Heil stuff you have to do some serious adjustment on the TX EQ which would make microphone changes cumbersome. I have settings now that enable me to use an old Turner +3 on the front panel and CM-500 on the rear. I am told there is little to no difference in audio from those who know my rather terrible voice. I was not blessed with broadcast quality vocal chords...:-) Now my XYL (this is strange) has a great voice for HF and everyone who chats with her comments on the audio and tell her she sounds better than the OM...:-(...now that does suck!!! The settings you sent me way back when Hector work great for me, well done with your testing back in the early days..My CM-500 is a definite keeper. Thanks again Hector for your posts on the reflector, always fun to read and I often learn just a little bit more. 73's Gary & Jennie (VK4JLG) On Tue, Jan 11, 2011 at 1:26 PM, Hector Padron <[hidden email]> wrote: > Ok,then because you don't like and I love it,do you want to sell it to me ? > > AD4C > > > > "If freedom means something,it is the right to tell others what they don't want to hear" –George Orwell > > --- On Mon, 1/10/11, ab2tc <[hidden email]> wrote: > > > From: ab2tc <[hidden email]> > Subject: Re: [Elecraft] RES: Yamaha CM500 > To: [hidden email] > Date: Monday, January 10, 2011, 8:38 PM > > > > Hello again, > > I am not talking about anything above 2700Hz at all. With my receive > bandpass set to 300-2700Hz the CM-500 sound definitely muffled compared to > any other headphones I have. Yes, I could compensate with the EQ, but then > it would be unuseable with any other headphones I have since there is no > macro support to quickly change the RX EQ settings quickly. Until that > happens the CM-500 stays shelved in my shack. > > AB2TC - Knut > > > AD4C2009 wrote: >> >> Lack of highs? Not mine,besides,does any ham transmit today with more than >> 4000Hz at the high end? answer is NO,most of them are below 3000Hz,at that >> freq ANY headset will response well.Also I injected an audio generator to >> my CM-500 from 20 to 5000Hz and I heard the tone from 60(my ears) all the >> way up to 5000Hz with same level,I don't see why they has "lack of >> highs".Besides the K3 has an excellent RX EQ and you can tailor the >> received audio to your personal taste so If you think it has too much >> lows,then cut them up with it. >> I have been using those Yamaha for more than a year and for me they sound >> as well as ANY other headset. Maybe some users feel bad because they are >> "cheap" compared with Heil, Senhisser,and others. >> >> AD4C >> <snip> >> > > -- > View this message in context: http://elecraft.365791.n2.nabble.com/Yamaha-CM500-tp5750572p5908494.html > Sent from the [HAM] 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] > > 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:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html -- Gary VK4FD - Motorhome Mobile http://www.qsl.net/vk4fd/ K3 #679, P3 #546 For everything else there's Mastercard!!! ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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O.K. you guys, now you've done it. I have to try the C-500 phones too. :)
Bob K6UJ On Jan 10, 2011, at 11:18 PM, Gary Gregory wrote: > Hector, > > I too love my CM-500 but then I set the RX EQ to suit and I don't have > a 'collection' of headsets...certainly would not waste money on Heil > gear...too rich for my blood and they are not real robust. > > Also found with the Heil stuff you have to do some serious adjustment > on the TX EQ which would make microphone changes cumbersome. > > I have settings now that enable me to use an old Turner +3 on the > front panel and CM-500 on the rear. I am told there is little to no > difference in audio from those who know my rather terrible voice. I > was not blessed with broadcast quality vocal chords...:-) > > Now my XYL (this is strange) has a great voice for HF and everyone who > chats with her comments on the audio and tell her she sounds better > than the OM...:-(...now that does suck!!! > > The settings you sent me way back when Hector work great for me, well > done with your testing back in the early days..My CM-500 is a definite > keeper. > > Thanks again Hector for your posts on the reflector, always fun to > read and I often learn just a little bit more. > > 73's > > Gary & Jennie (VK4JLG) > > On Tue, Jan 11, 2011 at 1:26 PM, Hector Padron <[hidden email]> wrote: >> Ok,then because you don't like and I love it,do you want to sell it to me ? >> >> AD4C >> >> >> >> "If freedom means something,it is the right to tell others what they don't want to hear" –George Orwell >> >> --- On Mon, 1/10/11, ab2tc <[hidden email]> wrote: >> >> >> From: ab2tc <[hidden email]> >> Subject: Re: [Elecraft] RES: Yamaha CM500 >> To: [hidden email] >> Date: Monday, January 10, 2011, 8:38 PM >> >> >> >> Hello again, >> >> I am not talking about anything above 2700Hz at all. With my receive >> bandpass set to 300-2700Hz the CM-500 sound definitely muffled compared to >> any other headphones I have. Yes, I could compensate with the EQ, but then >> it would be unuseable with any other headphones I have since there is no >> macro support to quickly change the RX EQ settings quickly. Until that >> happens the CM-500 stays shelved in my shack. >> >> AB2TC - Knut >> >> >> AD4C2009 wrote: >>> >>> Lack of highs? Not mine,besides,does any ham transmit today with more than >>> 4000Hz at the high end? answer is NO,most of them are below 3000Hz,at that >>> freq ANY headset will response well.Also I injected an audio generator to >>> my CM-500 from 20 to 5000Hz and I heard the tone from 60(my ears) all the >>> way up to 5000Hz with same level,I don't see why they has "lack of >>> highs".Besides the K3 has an excellent RX EQ and you can tailor the >>> received audio to your personal taste so If you think it has too much >>> lows,then cut them up with it. >>> I have been using those Yamaha for more than a year and for me they sound >>> as well as ANY other headset. Maybe some users feel bad because they are >>> "cheap" compared with Heil, Senhisser,and others. >>> >>> AD4C >>> <snip> >>> >> >> -- >> View this message in context: http://elecraft.365791.n2.nabble.com/Yamaha-CM500-tp5750572p5908494.html >> Sent from the [HAM] 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] >> >> 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:[hidden email] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html > > > > -- > Gary > VK4FD - Motorhome Mobile > http://www.qsl.net/vk4fd/ > K3 #679, P3 #546 > For everything else there's Mastercard!!! > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by py5eg
I use CM500 for few months now. I don't hear difference between Heil proset and CM500. Microphone is a bit different and TX EQ needed to be adjusted and mic gain reduced significantly. But the main CM500 advantage, aside from being 3 times cheaper than the Heil, they are much more comfortable, I can wear them for more than 10 hours straight during contest, while Heil would kill my ears after 3-4 hours. 73, Igor, N1YX ----- Original Message ----- From: "Robert Harmon" <[hidden email]> To: "Gary Gregory" <[hidden email]> Cc: [hidden email] Sent: Tuesday, January 11, 2011 2:28:55 AM Subject: Re: [Elecraft] RES: Yamaha CM500 O.K. you guys, now you've done it. I have to try the C-500 phones too. :) Bob K6UJ ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
Re: unequal power output per tone in FSK
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In reply to this post by Kok Chen
The effect of the skew (difference in amplitude of the mark and space
tones) is to cause an undesired amplitude modulation in addition to the desired frequency modulation of the FSK. If the skew is due to a constant slope in the frequency response, then the shape of the modulation is the same for the AM and the FM. 1 dB of skew is equivalent to about 10% AM modulation. I haven't calculated the Bessel functions, but it seems clear that the sidebands from 10% AM modulation are much weaker than the sidebands of the 170-Hz deviation FSK (which is a modulation index much greater than 1 for 45-baud RTTY). > A rough guess turned out to be relatively easy and the bottom line is > that the far off QRM is only about 10 dB down from a phase > NON-continuous case of FSK generation, if the mark and space signals > are different by 1 dB. That sounds about right. If the FSK signal is unfiltered (instantaneous transitions between mark and space) then so will be the AM modulation. If you slow down the FSK transitions, then the AM transitions will slow down by the same amount. For any wave shape the AM sidebands are always much less than the FM sidebands. I don't believe 1 dB of skew would cause any significant additional QRM to nearby channels. As for affecting the received bit error rate, 1 dB of skew should be no worse than reducing power by 1 dB. Less than that if the transmitter is tuned for constant average power rather than constant peak power. Still, it would be worthwhile to eliminate the skew. I understand Wayne has that on his list. Alan N1AL On Mon, 2011-01-10 at 21:44 -0800, Kok Chen wrote: > On Jan 10, 2011, at 3:35 PM, Wayne Burdick wrote: > > > The effect on transmission bandwidth is negligible, and it's also > extremely unlikely to affect copy. > > > Hank W6SX had written to ask me for a rough guess of transmission > bandwidth when there is a 1 dB difference in level between mark and > space carriers. > > A rough guess turned out to be relatively easy and the bottom line is > that the far off QRM is only about 10 dB down from a phase > NON-continuous case of FSK generation, if the mark and space signals > are different by 1 dB. Basically, about 10 dB down from the first > plot in this web page: > > http://homepage.mac.com/chen/Technical/FSK/Sidebands/sidebands.html > > The ideal FSK phase continuous signal should look like the second plot > on that page. > > So, forget about phase noise! Your FSK keying sidebands are going to > be a much bigger problem for your nearby neighbors :-). > > I think that a judicious choice of tone pairs could help, but it is a > band-aid, not a technical solution. > > 73 > Chen, W7AY > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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after the 62nd recommendation for this headset I have finally ordered one.
http://www.samash.com/p/Yamaha_CM500-Headphones-with-Microphone_-49969751 Mark n2qt ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Thanks for the info Mark, good price and no shipping cost!
I also have succumbed to the many recommendations and realized that I was hopelessly induced to buy the headphones. :) Bob K6UJ On Jan 11, 2011, at 2:44 PM, Mark n2qt wrote: > after the 62nd recommendation for this headset I have finally ordered one. > > http://www.samash.com/p/Yamaha_CM500-Headphones-with-Microphone_-49969751 > > Mark n2qt > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by py5eg
On 1/10/2011 5:42 AM, py5eg wrote:
> Has someone tested for yaesu rigs? What are the results? Yes. A few months ago, I made a simple adapter to connect a CM500 to an FT1000MP for use at PJ4A. I checked it out with the MP that's still on my shelf (and for sale), and got critical on the air reports from a nearby super contester. The CM500 works just fine with the Yaesu, and sounds great. No adjustments needed for headphones. For the mic, you will need to set the mic gain VERY LOW to avoid overdriving the Yaesu's mic input. This does NOT imply anything bad about either the mic or the rig -- it's just that the mic is "hot" and the MP has plenty of available gain to accommodate mics that have very low output. And, as with any mic and the MP (or it's descendents), you need to carefully select the TX DSP that does the least damage to the audio. But if you DON'T turn the mic gain way down, or if you don't select the right DSP, the audio will sound just awful (like far too many SSB contesters). :) 73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Mark n2qt
Coincidently I ordered my second pair this morning at that same site,they charged me $47 shiped to Florida.They said also they have a strore in Tampa here so I should have them in two days.
AD4C "If freedom means something,it is the right to tell others what they don't want to hear" –George Orwell --- On Tue, 1/11/11, Mark n2qt <[hidden email]> wrote: From: Mark n2qt <[hidden email]> Subject: [Elecraft] Yamaha CM500 in stock at Sam Ash for $45 inc shipping To: "[hidden email]" <[hidden email]> Date: Tuesday, January 11, 2011, 10:44 PM after the 62nd recommendation for this headset I have finally ordered one. http://www.samash.com/p/Yamaha_CM500-Headphones-with-Microphone_-49969751 Mark n2qt ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Bob K6UJ
"no shipping cost"
Not exactly truth,they told me there is no free shiping for the state of FL although it was just few bucks. AD4C "If freedom means something,it is the right to tell others what they don't want to hear" –George Orwell --- On Tue, 1/11/11, Robert Harmon <[hidden email]> wrote: From: Robert Harmon <[hidden email]> Subject: Re: [Elecraft] Yamaha CM500 in stock at Sam Ash for $45 inc shipping To: "Mark n2qt" <[hidden email]> Cc: "[hidden email]" <[hidden email]> Date: Tuesday, January 11, 2011, 11:10 PM Thanks for the info Mark, good price and no shipping cost! I also have succumbed to the many recommendations and realized that I was hopelessly induced to buy the headphones. :) Bob K6UJ On Jan 11, 2011, at 2:44 PM, Mark n2qt wrote: > after the 62nd recommendation for this headset I have finally ordered one. > > http://www.samash.com/p/Yamaha_CM500-Headphones-with-Microphone_-49969751 > > Mark n2qt > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > 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:[hidden email] 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
Re: unequal power output per tone in FSK
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In reply to this post by Alan Bloom
I decided that rather than depend on a hand-waving argument I would go
ahead and do a Mathcad simulation to calculate the effect of 1 dB of tone skew (unequal mark and space tone amplitudes) on the transmitted FSK spectrum. Basically, I found that it made no significant difference. A PDF of the Mathcad file is at: ftp://ftp.elecraft.com/tmp/FSK_tone_skew.pdf The equations are on the first page and the spectrum graphs are on the second. (On my browser I have to copy the part of the above URL after the "ftp://" part and paste it into the browser window to get FTP to work.) Alan N1AL On Tue, 2011-01-11 at 13:10 -0800, Alan Bloom wrote: > The effect of the skew (difference in amplitude of the mark and space > tones) is to cause an undesired amplitude modulation in addition to the > desired frequency modulation of the FSK. If the skew is due to a > constant slope in the frequency response, then the shape of the > modulation is the same for the AM and the FM. > > 1 dB of skew is equivalent to about 10% AM modulation. I haven't > calculated the Bessel functions, but it seems clear that the sidebands > from 10% AM modulation are much weaker than the sidebands of the 170-Hz > deviation FSK (which is a modulation index much greater than 1 for > 45-baud RTTY). > > > A rough guess turned out to be relatively easy and the bottom line is > > that the far off QRM is only about 10 dB down from a phase > > NON-continuous case of FSK generation, if the mark and space signals > > are different by 1 dB. > > That sounds about right. If the FSK signal is unfiltered (instantaneous > transitions between mark and space) then so will be the AM modulation. > If you slow down the FSK transitions, then the AM transitions will slow > down by the same amount. For any wave shape the AM sidebands are always > much less than the FM sidebands. > > I don't believe 1 dB of skew would cause any significant additional QRM > to nearby channels. > > As for affecting the received bit error rate, 1 dB of skew should be no > worse than reducing power by 1 dB. Less than that if the transmitter is > tuned for constant average power rather than constant peak power. > > Still, it would be worthwhile to eliminate the skew. I understand Wayne > has that on his list. > > Alan N1AL > > > On Mon, 2011-01-10 at 21:44 -0800, Kok Chen wrote: > > On Jan 10, 2011, at 3:35 PM, Wayne Burdick wrote: > > > > > The effect on transmission bandwidth is negligible, and it's also > > extremely unlikely to affect copy. > > > > > > Hank W6SX had written to ask me for a rough guess of transmission > > bandwidth when there is a 1 dB difference in level between mark and > > space carriers. > > > > A rough guess turned out to be relatively easy and the bottom line is > > that the far off QRM is only about 10 dB down from a phase > > NON-continuous case of FSK generation, if the mark and space signals > > are different by 1 dB. Basically, about 10 dB down from the first > > plot in this web page: > > > > http://homepage.mac.com/chen/Technical/FSK/Sidebands/sidebands.html > > > > The ideal FSK phase continuous signal should look like the second plot > > on that page. > > > > So, forget about phase noise! Your FSK keying sidebands are going to > > be a much bigger problem for your nearby neighbors :-). > > > > I think that a judicious choice of tone pairs could help, but it is a > > band-aid, not a technical solution. > > > > 73 > > Chen, W7AY > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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I did a simulation also this evening (after off line discussion with N1AL) and can confirm what Alan has said.
A 1 dB amplitude modulation only increases the keyclick noise floor by 0.5 dB 2 kHz away from the signal. It took a 6 dB difference in amplitude to raise the keyclicks 2 kHz away by 5 dB. 73 Chen, W7AY ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Mark n2qt
Ran across this link from last year but it still works. Just ordered mine. $45, free shipping Bill KD8JxJ ----- Forwarded Message ----- From: Mark n2qt <[hidden email]> To: "[hidden email]" <[hidden email]> Sent: Tuesday, January 11, 2011 5:44 PM Subject: [Elecraft] Yamaha CM500 in stock at Sam Ash for $45 inc shipping after the 62nd recommendation for this headset I have finally ordered one. http://www.samash.com/p/Yamaha_CM500-Headphones-with-Microphone_-49969751 Mark n2qt ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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