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Re: LF: ZEVS RX ant question, now success - 60 Hz in Europe

To: <[email protected]>
Subject: Re: LF: ZEVS RX ant question, now success - 60 Hz in Europe
From: "Markus Vester" <[email protected]>
Date: Sat, 4 Oct 2014 22:54:59 +0200
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Oh we can do that ourselves... remember the European 50 Hz grid went down to 49.99 every time you keyed up your PA ;-)
 
73, Markus 

From: DK7FC
Sent: Saturday, October 04, 2014 10:49 PM
Subject: Re: LF: ZEVS RX ant question, now success - 60 Hz in Europe

Hi Markus,

Maybe we can ask them to key the signal in QRSS-180? Should be no problem :-)

73, Stefan

Am 04.10.2014 21:58, schrieb Markus Vester:
Attempting to resend...
 
Sent: Saturday, October 04, 2014 1:18 AM
Subject: Re: LF: ZEVS RX ant question, now success - 60 Hz in Europe

Hi Wolf, Stefan,
 
yes I also noticed a weak 60 Hz line during my ELF experiment, and it is there in the accelerated wav files. Here are two spectrograms with 15.3 mHz bin width:
 
Unlike Zevs, 60 Hz seems to be more pronounced during 1855-2055 UT recording, ie our evening when the Atlantic was still in daylight. It was hardly visible in the morning, 0541-0741 UT.
 
During the two evening hours, the 60 hz line drifted up and down by about two pixels, 30 mHz. That frequency instability may actually be a unique signature which can be used to exclude local origin, simply by comparing simultaneous traces from two different receive sites. I think there may even be an online log of American line frequency history, but couldn't find it on the web - any hints from the group?
 
Best 73,
Markus (DF6NM)
 

Sent: Saturday, October 04, 2014 12:41 AM
Subject: Re: LF: ZEVS RX ant question, now success

Hi Stefan and all,

you wrote:
  Yes, a good idea. I will try to catch it :-) But how do i know that it is the US mains instead of a 60 Hz monitor? Is the 60 Hz from the mains more stable?
I guess the opposite: Similar to our Eu mains frequency, the US 60 Hz signal "wanders around" very slowly, as the load changes, but in the long run they also keep the frequency stable, nation-wide. Not sure about the maximum excursion from the nominal frequency (I lost the notes and screenshots years ago when a harddisk died) and how many mHz per minute the frequency may drift. But you can see the weak 60 Hz trace in Renato Romero's ZEVS spectrogram at

http://www.vlf.it/zevs/zevs.htm

73,
  Wolf .

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