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Re: Topband: Polarity and Phase

To: <K8LV1@aol.com>,"topband_contesting_com" <topband@contesting.com>
Subject: Re: Topband: Polarity and Phase
From: "john battin" <jbattin@msn.com>
Date: Thu, 15 Apr 2004 21:28:24 -0500
List-post: <mailto:topband@contesting.com>



    ----- Original Message ----- 
    From: K8LV1@aol.com<mailto:K8LV1@aol.com> 
    To: jbattin@msn.com<mailto:jbattin@msn.com> 
    Sent: Thursday, April 15, 2004 11:51 AM
    Subject: Re: Topband: Polarity and Phase


    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 in phase two receivers have to be for good 
diversity reception and how that is measured. I challenged one of Tom's (W8JI) 
measurements and I was wrong. 

          Second, and most important, in your experience with diversity 
reception, have you detected any clear patterns of behavior that can be 
summarized? In particular, if enhancements of any type can be obtained, approx. 
what is their magnitude? Are we talking 1 db or 10db? 

    My conclusions:
     The receivers need to be on the same frequency. The receivers need to have 
their selectivity, gain, etc matched as close as possible. Phase is not too 
important if you are listening in stereo and the antennas are wide spaced. In 
my case, I often listen to a vertical array with one ear and beverages in the 
other. Most of the time there is an advantage with this diversity reception 
(almost nothing  "Always Happens" on Top Band).  It is not unusual to have a Q3 
signal become Q4 or Q5. If the signals are not fading together (one peaking 
when the other is down) then it is the most dramatic. 

    73 
    Eric K8LV
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