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Re: LF: RE: DCF-77

To: [email protected]
Subject: Re: LF: RE: DCF-77
From: DK1IS <[email protected]>
Date: Tue, 06 Aug 2013 18:45:48 +0200
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Hi Roelof and Clemens,

besides the AM time signal DCF 77 has an additional phase modulation to better define the start of the seconds which can be heard as a hissing noise; see e.g. Wikipedia.

73,
Tom, DK1IS

Am 06.08.2013 18:32, schrieb Clemens Paul:
Hi Roelof,

I just did a quick check on the remote Perseus at DL0AO
while resting on a couch in my shack.
This saved myself from having to get up from the couch at 36°C
for switching on my own Perseus. :-)
I see two 50Hz (+/-) spurs about 23dB down.
Noise sidebands are asymmetric "here".
On the lower side ca. 290Hz,on the upper side ca. 160Hz wide judging from
waterfall.

HTH
73
Clemens
DL4RAJ


-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Roelof Bakker
Sent: Tuesday, August 06, 2013 5:43 PM
To: [email protected]
Subject: LF: DCF-77

Hello all,

I just noticed that DCF-77 on 77.5 kHz has what looks like 500 Hz wide
noise sidebands.
Am I the only one who sees this, or is this done on purpose e.g. some
datamode transmission.

73,
Roelof, pa0rdt



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