TX antenna challenge
I did some interesting antenna test during the evening sun. The test does not meet scientific requirements, but still shows interesting results.
As a comparison in the uplink, I have had the following antennas competed
- 3 Turn Helix in front of 1m prime focus dish
- 36 turn Helix (rhcp)
- 5 ½ turn Helix in front of 90cm Offset, but overhead the LNB ( o bit of center)
The 3 turn with prime focus was definitely the winner. Around 7 dB less (not calibrated) I received the signal from the 90cm Offset with 5 ½ turn helix. Far away (only a bit over the noise) I could read the signal from the helix. The TX Power was 2 watt.
I´ll practice some more tests the next days, with yagis and “beer can antenna” in front of the dish.
Please note, during the transmission with the prime focus the Helix was not in front of the antenna anymore.