RE: [Elecraft] CW Secrets of the Masters
There's also the simple fact that a given frequency separation at a lower side tone frequency represents a greater percent difference. That is, the difference between a desired 200cps tone and an interfering 250cps tone is 25%. The difference between a desired 450cps tone and a 500cps tone is 11%. That's over a 50% difference in what the operator is asking the brain to discriminate, and that's a significant difference. ...robert At 03/13/2008 14:27, John King wrote: 400 Hz is my upper limit as well. Lower than 300 Hz is certainly desirable to me. I have forty plus years on CW, and no significant hearing loss. I do the between-the-headphones DSP far more effectively at 400 Hz and below. 73, john WA1ABI -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of David Cutter Sent: Thursday, March 13, 2008 2:17 PM To: Bill W4ZV; elecraft@mailman.qth.net Subject: Re: [Elecraft] CW Secrets of the Masters This makes perfect sense. The ears have a logarithmic response to sound pressure and to frequency. David G3UNA Another one that Fred K3ZO (many time winner of Dayton CW pileup contests) recently mentioned is using extremely low pitch for weak signals. Fred said many commercial ops he knew used somewhere in the 2-300 Hz range so he thought his favored 400 Hz was rather high! 73, Bill W4ZV ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: Elecraft@mailman.qth.net 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 Robert G. Strickland PhD ABPH - KE2WY [EMAIL PROTECTED] Syracuse, New York USA ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] CW Secrets of the Masters
Bill W4ZV wrote: Another one that Fred K3ZO (many time winner of Dayton CW pileup contests) recently mentioned is using extremely low pitch for weak signals. Fred said many commercial ops he knew used somewhere in the 2-300 Hz range so he thought his favored 400 Hz was rather high! I found the exact quote from Fred which was on the PVRC reflector: With a rig like the Orion the tone you set your sidetone monitor to is also very important. I like to copy CW at 400 Hz, and I have been surprised when people have commented that 400 Hz is a much lower tone than they like to use. I believe it is established science that the lower the tone you use to copy, the better your ear is at separating out tones which differ in frequency very little from each other. I actually thought I was using a rather high choice of tone, as I recall some articles I read years ago, perhaps by professional ship-to-shore ops, advocating 200 or 300 Hz as their tones of choice. 73, Bill W4ZV -- View this message in context: http://www.nabble.com/VP6DXthe-true-story---tp15957849p16034290.html Sent from the Elecraft mailing list archive at Nabble.com. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] CW Secrets of the Masters
This makes perfect sense. The ears have a logarithmic response to sound pressure and to frequency. David G3UNA Another one that Fred K3ZO (many time winner of Dayton CW pileup contests) recently mentioned is using extremely low pitch for weak signals. Fred said many commercial ops he knew used somewhere in the 2-300 Hz range so he thought his favored 400 Hz was rather high! 73, Bill W4ZV ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] CW Secrets of the Masters
400 Hz is my upper limit as well. Lower than 300 Hz is certainly desirable to me. I have forty plus years on CW, and no significant hearing loss. I do the between-the-headphones DSP far more effectively at 400 Hz and below. 73, john WA1ABI -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of David Cutter Sent: Thursday, March 13, 2008 2:17 PM To: Bill W4ZV; elecraft@mailman.qth.net Subject: Re: [Elecraft] CW Secrets of the Masters This makes perfect sense. The ears have a logarithmic response to sound pressure and to frequency. David G3UNA Another one that Fred K3ZO (many time winner of Dayton CW pileup contests) recently mentioned is using extremely low pitch for weak signals. Fred said many commercial ops he knew used somewhere in the 2-300 Hz range so he thought his favored 400 Hz was rather high! 73, Bill W4ZV ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: Elecraft@mailman.qth.net 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: [Elecraft] CW Secrets of the Masters
Disclamer: I am a very bad CW operator :-( But I discovered that my K2, had a rather limited low freq audio response. So I took a look at the schematic for the audio circuit in the K2... The original low freq. cutoff (-3db) freq. is approx. 640Hz (with KAF or DSP moduls installed) or 400Hz (with no audio moduls) determined by C25, C26 and the 5kOhm volume control (and NE612 mixer impedance), to extend the audio frequency response for the low freq. I put 0.1uF SMD across C25 and C26, extending the low frequency response to approx. 320Hz. This improves the SSB sound of the receiver, and improves SNR when copying low pitch CW signals. This simple mod increases the rx audio signal at 300 Hz by about 3dB. This could help those copying low pitch CW signals. just my $ .02... 73, Matti, TF3MA -- Marteinn SverrissonTF3MA Langitangi 2Internet: tf3ma [at] raunvis [dot] hi [dot] is 270 Mosfellsbær http://www.raunvis.hi.is/~tf3ma Iceland ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
