Re: LF: TXing on VLF again, my first homemade linear PA! :-)

[Markus Vester <markusvester@aol.com>]

Welcome back, Roland! Your signal is indeed significantly stronger than on March 27/28,  and a nice narrow peak building is up in the 63 uHz window. So both your amplifier and your samplerate tracking seem to be working fine again. 

 

Regarding frequency separation: At some distance, PSK transmissions are almost invisible in a spectrogram, and will hardly have an adverse effect on carrier detections. But this is not true the other way round, as a potential EbNaut decode will indeed be disrupted by an in-band carrier of similar strength. Currently DK7FC and DL3NDR are transmitting almost on the same QRG, and I don't expect to be able to decode the weaker signal from Stefan.

 

As mentioned before, I would recommend to continue using the grabber waterhole near 8270.000 for narrowband or carrier transmissions. To avoid being affected by these, EbNaut operators might then want to move out their transmissions by say +- 0.1 Hz (preferably an integer multiple of the symbolrate). For example, going to 8270.1 or 8269.9 Hz would work optimally for 10, 20, 30... second symbols.

 

Best 73,

Markus (DF6NM)

-----Ursprüngliche Mitteilung-----
Von: Roland Bruestle <r@mbsks.franken.de>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: So, 24 Apr 2016 7:01 pm
Betreff: Re: LF: TXing on VLF again, my first homemade linear PA! :-)

Hello,
I'm on 8270Hz with 0.3A as test transmission.  I hope our signal separation is good enough.
Roland Dl3NDR