-Tu Markus and Ha-jo

Henny pa3cpm

best 73s

 

 

 

---- Original Message -----

From: [email protected]

To: [email protected]

Sent: Thursday, March 05, 2009 1:11 AM

Subject: Re: LF: Re: capture 67hz.jpg

  "Markus Vester" <[email protected]> schrieb:

Dear Henny,

 

my QTH is about 400 m from a railway line, and I regularly saw their 16.667 Hz power frequency and several ELF harmonics. The E-fields are relatively strong as the lines normally do not carry a grounded top wire for lightning protection. The "modulation" could be caused by some switching activity.

 

Another origin might be a controlled rectifier on the 50 Hz mains, which could be triggered at a subharmonic frequency.

 

Best regards,

Markus, DF6NM

Dear Markus,

I have even thougth that this "67Hz" in reality might have been 66.667 Hz, and this would open other ideas, such as mixer products between 50 Hz and 16,667 Hz etc.

HW?

73 Ha-Jo, DJ1ZB 

----- Original Message -----

From: henny van elst

To: blacksheep

Sent: Wednesday, March 04, 2009 7:43 PM

Subject: LF: capture 67hz.jpg

Hi,Lf

capture unid signal 67hz,but who ?

henny pa3cpm

best 73s

 

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