[Elecraft] K3 Beta 5r10 and LINK

[Jim Brown]

On Mon,2/16/2015 9:18 AM, wb6rse1 at mac.com wrote:
> The CPU between my ears is what the L vs R phase difference processes in Diversity mode. I can get a somewhat similar affect using AFX (or the equivalent with a Heil headset that has a phase reversal switch) but significantly without the benefit of the phase difference of the received signal from two different antennas in Diversity RX.

You (and Heil) are using the word "phase" incorrectly when you talk 
about "reversing" it. What that switch is doing is reversing the 
POLARITY. Polarity has two values -- normal and inverted. Polarity is 
the same for all frequencies. Bob Heil, who claims to be the audio guru 
should know better -- the word polarity has been used in this manner in 
pro audio for nearly 40 years.

Phase is a continuously variable function measured in degrees (or 
radians), has the range of +/- infinity. Phase has no meaning for 
signals of different frequencies. When phase differences are the result 
of time differences between two signals of the same frequency (for 
example, a direct signal and a reflected one), the phase difference is 
proportional to the time difference. These multiple arrivals cause what 
we hear as "picket fencing" at VHF and UHF, and long slow fades on the 
lower frequency bands (including 160M). The peaks occur when direct and 
reflected are more nearly in phase, the dips occur when direct and 
reflected are nearly equal in amplitude but close to 180 degrees out of 
phase.

Another example -- when we use lengths of feedline to provide phase 
shift for antenna arrays, the amount of phase shift depends on the 
frequency. If we want two antennas to be driven precisely in phase over 
a broad frequency range (for example, wide bands like 160M, 80M, and 
10M), we should use two lines of equal length. A half-wave (or multiple 
of half-waves) will provide the desired phase relationship at a single 
design frequency, but a different value away from that frequency.

73, Jim K9YC