1940Re: [SpectrumLabUsers] FUNcube Dongle and WFM
- Apr 11, 2014
> If I have two channels, Left and Right, one carrying centre to +96 kHz and onePaul,
> carrying centre to -96 kHz, but the demodulator only works with 0 to 192 kHz,
> then if I frequency shift both by +96 kHz. I get them both positive, but I
> also have to invert the negative frequencies. I then have to combine the two
> channels before the demodulator function, which I understand is in the Black
> Box modules, and I don's see a way of doing that after the filter boxes.
It is simpler than you may think.
You have a -96 to +96kHz spectrum.
In the Filter you shift *that* entire spectrum 96kHz higher.
(You don't treat the halfs separately.)
In "filter option"
enable "reject negative frequencies"
enable I/Q input
The filter output will then deliver 0..196kHz with no more negative frequencies
> Which is why I think that the WFM function is an integral part of the PerseusNo there's no Perseus specfic funtion that late in the chain anymore.
> config and not available to something imitating a sound card. I guess only
Jurgen Bartels Suellwarden, N. Germany
Ant. hor: 29-45MHz 7-el, 45-87MHz 11-el, FM 15.11, Band-3:13-el, UHF:48-el
TV: Winradio G305 / Fly2000 + video noise filter & variable IF BW
FM: Downconverter + Perseus + Speclab as WFM demod.
MW: 30 x 4m EWE 320° with JB-terminator, Winradio & Perseus
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