'
160米会受到一千公里内的雷干扰,在城市内还会受到很多电器的干扰,这些都几乎没法可避免的,我现在的情况刚好是这样,我的天线附近有一个冷却水塔,他开动的时候我的160米就是只有干扰,而且它是几乎24小时工作的,我试过垂直、dp、不谐振的地面天线,但还是逃不脱水塔的干扰魔掌。
'
有关噪音..... w0ri的关于1998年他在北京清华大学by1qh和crsa by1pk时
尝试160米时的情形......
-----original message-----
from: harold smith [mailto:w0rihps@sbcglobal.net]
sent: 2005年2月3日 12:44
to: david zhou, ba4dw
cc: merv k9fd schweigert
subject: re: topband: noise on 160m was big today, please be patient.
david:
you might check with by1qh about an amplifier for 160 meters.
when merv, k9fd and i were there in jan 1998, we left an ameritron al-811
amplifier. i am sure that they are not using it now.
i am sure that merv's and my qsl card are still on the wall at the operating
position.
just a thought.
also, when we were on 160 from by1qh the qrn level was s9 to +10db. we tried
all kinds of noise reducers and nothing worked.but we still worked over 500
stations on 160. the noise came from all directions. at by1pk the noise was
even worse.
73 de price w0ri
----- original message -----
from: "david zhou, ba4dw"
to: <topband@contesting.com>
sent: tuesday, february 01, 2005 5:17 pm
subject: topband: noise on 160m was big today, please be patient.
> hello everyone,
>
> i know there are a lot of eu guys calling me this morning. i managed to
> work some oz, pa, i, dl stations, but only a few. seeing the spots on
> cluster, i know i also gave more i know i also gave more stations
> frustrations. please be patient, the noise level was extremely high today,
> even i use aip and att on my ts-50s, the noise level was over 9,
> which means 9 ++++ if i release aip and att. but this is not always the
> case, in the contest, the noise level was pretty low, and i managed
> working more than 40 west coast and middle west us stations in one hour,
> and more eus as well.
>
> now i have a fl-2100z linear amplifier, which runs 400-500 watts output,
> and a dipole antenna for 160m. it's just a start of my 160m dxing. please
> be patient, and i will be there tomorrow morning for eus...
>
> 73,
>
> david zhou, ba4dw
>
> from downtown, shanghai