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1. Topband: Polarity and Phase (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 14 Apr 2004 09:13:32 -0500; You are absolutely incorrect! First, you don't understand (or are unwilling to admit) that phase and polarity are different. When you reverse the wires that connect elements of a system (e.g., a rec; /archives//html/Topband/2004-04/msg00083.html (12,352 bytes)
2. Re: Topband: Polarity and Phase (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Wed, 14 Apr 2004 14:55:30 -0400; Hi Jim, I have two antennas brought into phase feeding my receivers. I can combine the receivers in mono. 1.) If I flip the speaker lead on one, I get a nearly-perfect audio null (when volume levels; /archives//html/Topband/2004-04/msg00086.html (8,848 bytes)
3. Re: Topband: Polarity and Phase (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 14 Apr 2004 16:42:50 -0500; If the receivers are tuned to different frequencies, the resulting audio signals are of different frequencies, and phase has no meaning! Phase is only defined for sine waves of the same frequency! Yo; /archives//html/Topband/2004-04/msg00087.html (9,322 bytes)
4. Re: Topband: Polarity and Phase (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Wed, 14 Apr 2004 18:45:11 -0400; I'm going to make one last comment on this because although I'm pretty busy this is really a fascinating thing for me also, and very difficult to understand! the Well, I don't mean they are THAT far; /archives//html/Topband/2004-04/msg00089.html (10,001 bytes)
5. Re: Topband: Polarity and Phase (score: 1): Author: W0UN -- John Brosnahan <shr@swtexas.net>; Date: Wed, 14 Apr 2004 19:06:41 -0500; If the receivers are tuned to different frequencies, the resulting audio signals are of different frequencies, and phase has no meaning! Phase is only defined for sine waves of the same frequency! Ac; /archives//html/Topband/2004-04/msg00090.html (12,831 bytes)
6. Re: Topband: Polarity and Phase (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 14 Apr 2004 20:52:26 -0500; No problem. When you have time to think about it, I'll try to help you get your head around it. This is stuff that we in the pro audio world have had to spend a lot of effort understanding thoroughly; /archives//html/Topband/2004-04/msg00091.html (11,718 bytes)
7. Re: Topband: Polarity and Phase (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 14 Apr 2004 21:27:58 -0500; I understand your examples and it is, indeed, excellent work. Thanks for sharing it. 73, Jim _______________________________________________ Topband mailing list Topband@contesting.com http://lists.c; /archives//html/Topband/2004-04/msg00093.html (7,702 bytes)
8. Re: Topband: Polarity and Phase (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Wed, 14 Apr 2004 23:00:42 -0700; an I think this last statement is a red herring, Jim. While it is true that a feedline will have a different phase shift at every frequency, that doesn't mean that this phase vs. frequency behavior i; /archives//html/Topband/2004-04/msg00094.html (16,392 bytes)
9. Topband: Polarity and Phase (score: 1): Author: "john battin" <jbattin@msn.com>; Date: Thu, 15 Apr 2004 06:09:26 -0500; It requires a time delay of about 1ms to take two 500hz. tones from being in phase to being out of phase. I can see no way that adding 180 degrees of feedline to one of the recievers input (added del; /archives//html/Topband/2004-04/msg00097.html (6,855 bytes)
10. Re: Topband: Polarity and Phase (score: 1): Author: W0UN -- John Brosnahan <shr@swtexas.net>; Date: Thu, 15 Apr 2004 08:00:01 -0500; At 06:09 AM 4/15/2004, john battin wrote: It requires a time delay of about 1ms to take two 500hz. tones from being in phase to being out of phase. I can see no way that adding 180 degrees of feedlin; /archives//html/Topband/2004-04/msg00099.html (9,055 bytes)
11. Re: Topband: Polarity and Phase (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 15 Apr 2004 08:26:07 -0500; No, it does not. But it IS one way that it is done. And my point is that the phase shift achieved in that line is DIFFERENT from changing the polarity. I could also have used the example of a passive; /archives//html/Topband/2004-04/msg00100.html (16,964 bytes)
12. Re: Topband: Polarity and Phase (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Thu, 15 Apr 2004 09:48:08 -0400; I was going to use that as an example also John, but the post was so long I deleted it! I only want to add a couple observations. I notice if the phase relationship between incoming channels is not; /archives//html/Topband/2004-04/msg00101.html (9,159 bytes)
13. Re: Topband: Polarity and Phase (score: 1): Author: "Brian Mattson" <k8bhz@myvine.com>; Date: Thu, 15 Apr 2004 11:43:52 -0400; It requires a time delay of about 1ms to take two 500hz. tones from being in phase to being out of phase. I can see no way that adding 180 degrees of feedline to one of the recievers input (added del; /archives//html/Topband/2004-04/msg00102.html (8,171 bytes)
14. Re: Topband: Polarity and Phase (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 15 Apr 2004 10:51:03 -0500; No, I'm not. We're trying to separate a signal from noise. Our signal may be narrowband (CW), but the noise is not. We can, of course, help ourselves by reducing the bandwidth with narrow filters, bu; /archives//html/Topband/2004-04/msg00103.html (9,018 bytes)
15. Re: Topband: Polarity and Phase (score: 1): Author: "john battin" <jbattin@msn.com>; Date: Thu, 15 Apr 2004 21:28:24 -0500; John: I just got back in town and took a quick look at this phase controversy. Would you please answer two questions for me. First, what is the controversy really about. It is really about how close; /archives//html/Topband/2004-04/msg00110.html (9,028 bytes)
16. Re: Topband: Polarity and Phase (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Thu, 15 Apr 2004 21:13:09 -0700; I think I see where you are going with this. Your video cable example (in your other email) illustrates your point very well. For narrowband systems, a 180 degree phase shift, Tau/2 time delay, or a; /archives//html/Topband/2004-04/msg00111.html (12,913 bytes)
17. Re: Topband: Polarity and Phase (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Fri, 16 Apr 2004 07:19:19 -0500; Yes. I think your example (an excellent one) helps illustrate how time, frequency, and phase are so tightly related that it is hard for us to get our brains around the relationships between them. W0; /archives//html/Topband/2004-04/msg00113.html (12,001 bytes)

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