Hi Chris, LF,

 

this is probably TBA, a Turkish RTTY station, which is occasionally operating on 139.0 kHz (right between DCF's mark and space). It has been visible here several times in the past.

Best 73,

Markus

-----Ursprüngliche Mitteilung-----
Von: Stefan Schäfer <[email protected]>
An: Chris 4X1RF <[email protected]>
Cc: Markus Vester <[email protected]>; [email protected]
Verschickt: Do., 19. Mai. 2011, 0:04
Thema: Re: DCF39 signal

Hello Chris, all, 
 
This looks like a MSK signal to me, like i had at 136.6 kHz (153 kHz - 16.4 kHz). Your IF is 128 kHz if i remember correctly so the signal appears at 11 kHz. Hm, others may find the dependency... 
This kind of signal was not visible before some weeks so maybe the input stage (1st FET) was a bit damaged by a strong local thunderstorm (charged raindrops)? I had the same problem on LF before some time :-( Now i am using a band filter stage in front the first FET so the gate is grounded, DC wise. 
 
73, Stefan/DK7FC 
 
Am 18.05.2011 23:24, schrieb Chris 4X1RF: 
> Hello Stefan, Markus, Scott, 
> 
> Looks like all my posts to the reflector never make it to the list so > this e-mail is addressed directly to you. If you think it may be worth > something then please CC to LF also, thanks! 
> 
> 
> I was surprised by the unusually strong DCF39 signal in 4X between > 12-15UTC when usually there's just a faint trace of the carrier. I > don't recall seeing this in the past but maybe you did or have a > better explanation? Signal looks like probably using a different kind > of modulation, pattern which continues at this late evening hour also. 
> 
> http://dl.dropbox.com/u/10280270/yo4x1rf_DCF39_18may2011.jpg 
> http://dl.dropbox.com/u/10280270/4x1rf_DCF39_18may2011.jpg 
> 
> Scott, there's also a strong VOR peak around 11:30 on your Daily > 153kHz page. Probably related to what I'm seeing here?!? 
> 
> 73s 
> Chris 4X1RF