Here again is the layout around my hourse, showing:
- The old antenna (ANT 2) down the hill, its feedpoint about as high as the roof of the house.
- The new antenna (ANT 1) up the hill, it's feedpoint about 14m above the roof of the house.
View from above:
Besides being located farther away from the house and in the clear, this new antenna also enjoys a lower take-off angle for clearing the
top of the mountain (i.e., New Ant.: 30 deg.; Old Ant.: 40 deg.)
IN THE A/B TESTS BELOW:
- All tests were conducted during the 2020 CQWW DX CW contest.
- The RF Gain was often turned down, and/or attenuation applied to reduce the signal levels to mid range on the S-Meter.
- The Receiver (an ICOM IC-7300) has 3 dB per S-Unit (not 6).
- "Nix" is German slang for "nothing at all".
- "New Ant" = "ANT-1" ¦ "Old ANT" = "ANT-2"
Although in theory a major CW DX contest is a great opportunity to test antennas, it turned out to be a very difficult task, for several
- Contest Exchanges are very short, which doesn't allow much time for switching back and forth.
- On the low bands, the local (European) stations were usually stronger than the DX station that I was trying to copy.
- The poor dicipline of th European stations who continued to call the DX even while he was transmitting made it difficult to copy the DX station.
- S-Meter response to the local stations made it difficult to read the signal strength of the DX station.
On several occasions, I simply gave up and did not record the station because it was impossible to be sure of the results.
Noise really was not an issue in the contest. The only thing I distinctly observed was that the noise level on 15m was S1 on the
old antenna and S0 on the new antenna.
SUMMARY OF RESULTS:
- Most of the time I could copy all the stations well enough on both antennas, but quite often, the new antenna was 1 to 2 S-Units
- The signal strength was often the same on both antennas.
- On rare occasions, the signal strength was stronger on the old antenna than on the new antenna.
- The biggest difference was seen when a band began to close.
- This was observed most often on 15m.
- On several occasions, a station was perfectably readable on the new antenna but barely heard (if at all)
on the old antenna. This was recorded as "Nix".