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Re: LF: Lines in the DK7FC opds window

To: [email protected]
Subject: Re: LF: Lines in the DK7FC opds window
From: DK7FC <[email protected]>
Date: Thu, 08 Jan 2015 22:53:42 +0100
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Hi Markus,

Hmm, a mystery :-)
Actually the band pass filters should not pass a signicicant strength of DCF77. And the 10 kHz Ref signal is at -36 dB f.s., i.e. not overloading anything. Maybe it is a rest of the LO signal (125 kHz) reaching the ADC input? There is a LPF after the mixer though...
I don't know. I could switch OFF the LO and see if the lines disapper, HI.

73, Stefan

Am 08.01.2015 22:31, schrieb Markus Vester:
Hi Stefan,
just took a close look and noticed the 1 Hz spaced lines around 137.5 kHz. They appear to be a replica of the DCF77 timecode, including the minima at +-10 Hz corresponding to the 100 ms carrier gaps. Have you tried listening on this frequency? There must be some combination producing either the RF frequency (eg. 60 + 77.5 = 137.5 kHz) or your IF (12.5 kHz), perhaps including multiples of the 10 kHz GPS reference. I just cant point my finger exactly on how it happens.
Best 73,

From: DK7FC
Sent: Thursday, January 08, 2015 9:51 PM
Subject: LF: Old version OPERA >> ''Opera Fixed'' <<

Hi Jay,

You have been on air last night in OP32? Unfortunately i got no decode.
I guess it could be due to the local QRM which is still high in this
location. My LF DX grabber shown the RX window looking dramatic in
424uHz and with AGC.
If you continue to TX this night maybe, would you like to try a
frequency which is clean on my side?
Would like to get a decode from you, to reduce the ratio (FC received by
XNS) / (XNS received by FC)

73, Stefan

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