Re: LF: WSPR-15 this weekend

[Markus Vester <markusvester@aol.com>]

Hi Stefan, Paul,

should I also move down?

Yes the emitted FSK sidebands from DCF39 during telegrams indeed have narrow nulls around 137430, 570, 630, 770 Hz, with a periodic pattern repeating with the 200 Hz baudrate. However the picture changes a lot when noise blanking is enabled: As the NB triggers on the keyclicks, the interference can generally be reduced by around 20 dB, but the in this process the minima are also being filled up a bit. In the end, the remaining interference comes out pretty flat, so I've sort of given up trying to stick close to the spectral nulls.

Best 73,
Markus   

---Ursprüngliche Mitteilung-----
Von: DK7FC <selberdenken@posteo.de>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Fr, 23. Nov. 2018 20:25
Betreff: Re: LF: WSPR-15 this weekend

Hi Paul,

Yes, in principal 137.607 is OK but there are sidebands by DCF-39 having
a minimum close to the upper end of the spectrum. So, i remember Markus
has been on .622 and i am on .620. Using .624 would work but maybe
someone has a frequency offset of 1 Hz or so, then you are to close to
the end of the range. I offer you my frequency. Go to .620 and i will
QSY to .612. The DCF sidebands are an issue here in DL, maybe not for
2E0ILY who is closest to you, at least from this side of the pond.

73, Stefan

Am 23.11.2018 19:22, schrieb N1BUG:
> On 11/23/18 10:07 AM, DK7FC wrote:
>   
>> PS: Paul, will you transmit tonite
>>     
> Yes I will. Not sure yet exactly how much power, probably 4 dB down
> from my usual. I am setting up a combination of WSPR-15 and WSPR-2.
> Is 137.607 OK? With so poorly calibrated receivers around, it's hard
> to know who is on what frequency by looking at WSPRnet...
>
> 73,
> Paul
>
>
>