bg2kud 家在6楼，开始用4波段天线（振子长20斜拉下去），但只有7 14 21 28四个波段，其他波段无法愉快的玩耍。 看到有文章介绍1：9巴伦加16米振子加地线可以在大部分业余波段愉快的玩耍。 请教大家一下这两个天线那个更好。 使用1：9巴伦地线需要多长最佳？ 在一个在16米和21.9米之间选择那个更好
BD3PZF As the oscillator increases, so too will the underlying noise. Using four bands is quite effective. I also want to try all the bands with FT8.
bg2kud This afternoon, I switched the end-fed Balun to a 1:9 Balun. I'm using an 18-meter antenna and approximately 12 meters of ground wire. The SWR is mostly around 1.8:1. Now I have more bandwidth available for FT8.
Lynx The difference is that a 1:9 long-range antenna requires a ground plane/balancing line, while a half-wave feed does not. 4-band half-wave antenna can be used with a full-band transceiver.
bg2kud Lynx I am a G90S with a 125B amplifier. It is not necessary to use an amplifier. However, the amplifier can only operate in 4 frequency bands. Using an amplifier on other frequency bands will also result in poor performance. I don't know what the reason is.
BG5ELQ BH2XYE He mentioned a ratio of 1:9, where the length of the antenna should avoid certain specific points. You said that half of the end-fed antenna is 1:49, and the half wavelength of the antenna.
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