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The published facts: Isolation value between polarization is 20 dB. What's that mean? If one station is vertical and the other is horizontal the received signals with be down 20 dB from each other. Thus, if a signal would be 20 dB over S9 if both stations were vertical, the cross polarization will be received at S9. Or if the stations were both S9 using the same polarization, the cross-polarized station will now be received at around S6. (Note each S-unit = 6 dB, thus 3 s-units are 3 x 6 dB = 18 dB).

Hard to see that will the light bulb, but easy to measure with a signal strength meter. (Note valid condition for direct ground wave only.)

[QUOTE="KC9Q, post: 367379, member: 23691"] The published facts: Isolation value between polarization is 20 dB. What's that mean? If one station is vertical and the other is horizontal the received signals with be down 20 dB from each other. Thus, if a signal would be 20 dB over S9 if both stations were vertical, the cross polarization will be received at S9. Or if the stations were both S9 using the same polarization, the cross-polarized station will now be received at around S6. (Note each S-unit = 6 dB, thus 3 s-units are 3 x 6 dB = 18 dB). Hard to see that will the light bulb, but easy to measure with a signal strength meter. (Note valid condition for direct ground wave only.) [/QUOTE]

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