Return to KLUBNL.PL main page

rsgb_lf_group
[Top] [All Lists]

LF: Re: [rsgb_lf_group] VLF grabber settings

To: [email protected], RSGB LF Group at blacksheep <[email protected]>
Subject: LF: Re: [rsgb_lf_group] VLF grabber settings
From: wolf_dl4yhf <[email protected]>
Date: Wed, 02 Jul 2014 10:24:47 +0200
Authentication-results: mx.google.com; spf=neutral (google.com: [email protected] does not designate permitted sender hosts) smtp.mail=[email protected]
Delivered-to: [email protected]
In-reply-to: <[email protected]>
References: <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
User-agent: Mozilla/5.0 (Windows NT 5.1; rv:17.0) Gecko/20130620 Thunderbird/17.0.7
Hello Alex,

For the purpose of the grabber, you don't need to activate the 'Resample' option. So you can save some CPU power. The option 'synchronized resample' is used (for example) when the audio output is sent through a network to a remote server, which processes processes various streams from different receivers. When all streams arriving at the server use exactly the same sampling rate, signal processing is easier.
For the ultra narrow band spectrum display it is not necessary, because
the drifting soundcard sampling rate is compensated by adjusting the
software-based local oscillator.
All the best,
  Wolf DL4YHF .

Am 02.07.2014 07:44, schrieb Alex K [email protected] [rsgb_lf_group]:
  Hello LF\VLF!
I prepare now summer VLF-grabber for 8270 Hz band (in KO85HA): SingleLoop-ant 
abt 3.5 meters diameter + LNA (modified OK2BVG design) + bandpass filter 4-15 
kHz + EeePC with SpectrumLab (dfcw-6000?)
I have some questions about Sample Rate Calibration. On the picture there are my 
settings. Sample Rate changes slowly during the day within +-1 Hz. Whether "Sync'd 
Resample - all input channels" need to be enabled?
Any recommendations are welcomed.

Some TX activity for Dreamers band at summer time?

(full band view screenshot:  pretest Loop diameter=1.8 meter)


<Prev in Thread] Current Thread [Next in Thread>