説明:

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再生まで時間がかかります、そのまま5分程ほっぽって置くと暫くして再生がはじまります。 約18分間のビデオです、3/30日の夕方、７MHｚバンドの様子をビデオに撮りました。

Please wait for a few minutes, It takes considerably long time until start playing video.

[WPX contest 7MHz band just before sunset in tokyo. 18 min snap video]

Date: Mar 30, 2008
Time: 08:38 - 08:56utc (17:38 - 17:56jst)
Tokyo Suset time = 09:01utc (18:01jst)
Recorded by JA1DOT 4ele yagi 26mH

The band condition to the east coast & calibbean area did not seem to be good, or activity was low.


by JA1DOT

説明:

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Unidentified Radar Jamming on 7MHz

We have suffered the damage of this unidentified noise and we are in trouble very much. This noise comes here about four or five days per week. We can hear it from 4PM to next day 8AM. It is impossible for us to receive weak DX signal on 40m band. This is a severe trouble for us. This noise has been coming since Spring of 2005. You can see the noise situation by this video http://jp.youtube.com/watch?v=AthoPqyWy_M
In this Video, You can see the S meter changes while I turn my 40m 4element yagi. I also recorded the noise by changing RX frequency.

The noise masked for 6970KHz to 7035KHz at 19:46jst(10:46utc) on April 24, 2008. We have to give up QSO for Caribbean Sea and East coast station on CW. The width of this noise is about 65 to 70 KHz. Depending on the day or time, the center frequency of this noise shifted up and down. We often have the other pattern which masked for 7025 to 7090 KHz.

I looked for the source direction by 4element yagi. It seems to be the direction from Tokyo to 230-250deg.

I would like to have your information about this noise.

Best regards
Hisato JA1DOT

説明:

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NDXA flag slide

説明:

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JA6WFM Nakamura-san had operated from Ecuador as JA6WFM/HC5, Recently, He obtained HC5WW callsign and He had full size Inv-V ant for 40m band. The video was recorded at 1133z on 7/16. His voice was comming very clear and strong on 7088MHz.

説明:

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3X5A