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Re: LF: Rugby LORAN measurement?

from [Alberto di Bene] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: Rugby LORAN measurement?
From: Alberto di Bene <[email protected]>
Date: Tue, 11 Apr 2006 18:22:59 +0200
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References: <[email protected]> <000601c65582$aefd8ec0$cada380a@acer5gi5q0ubzj> <[email protected]> <004501c657e5$b779fbf0$0300a8c0@LAPTOP> <[email protected]> <004b01c65c09$afc51e30$0300a8c0@LAPTOP> <[email protected]> <001801c65c74$4b275b30$0300a8c0@LAPTOP>
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Peter Martinez wrote: 
The design of an MSF receiver, intended to recover the carrier frequency to 
any great accuracy, needs to be able to reject the existing 'unwanted' 
signals either side of the carrier. These are only about 15dB down and at 
+/-1Hz. I am referring to the 1 sec timing pulses (gaps).
[snip
Just for fun I displayed the spectrum of Rugby 60 kHz as received here, shifted to 1000 Hz :



My question is : why is the sideband corresponding to the tenth harmonic of the 1pps pulse almost zero ? Does this depend on the specific duty cycle of the modulating pulses ?
Just curious...

73  Alberto  I2PHD
 
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