Increasing USB bandwidth

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KC2Land
Posts: 4
Joined: Sun Jan 10, 2016 7:06 pm
Location: Long Island NY

Increasing USB bandwidth

Postby KC2Land » Mon Jul 04, 2016 12:26 am

Hi,

Is there a way to increase the USB bandwidth? I'm looking to decode VDL2 an I'm unable to get the bandwidth beyond about 10k.

Thanks!
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Hombre
Posts: 19
Joined: Sat Oct 10, 2015 9:20 am

Re: Increasing USB bandwidth

Postby Hombre » Mon Jul 04, 2016 4:25 pm

KC2Land wrote:Hi,

Is there a way to increase the USB bandwidth? I'm looking to decode VDL2 an I'm unable to get the bandwidth beyond about 10k.

Thanks!


Are you try to set DSB or USER. Bandwith is small over 11kHz.
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KC2Land
Posts: 4
Joined: Sun Jan 10, 2016 7:06 pm
Location: Long Island NY

Re: Increasing USB bandwidth

Postby KC2Land » Sat Aug 06, 2016 3:43 am

I'm trying to increase the bandwidth to 25khz in USB mode. The maximum I can expand it to is around 12k. Is there something I'm missing or is this a current limitation of SDRUNO?
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Hombre
Posts: 19
Joined: Sat Oct 10, 2015 9:20 am

Re: Increasing USB bandwidth

Postby Hombre » Sun Aug 07, 2016 8:39 am

There is limitation because for SSB 12kHz is over enough.
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DanubeBCL
Posts: 179
Joined: Sat Jul 02, 2016 12:39 pm

Re: Increasing USB bandwidth

Postby DanubeBCL » Sun Aug 07, 2016 1:04 pm

Hombre wrote:There is limitation because for SSB 12kHz is over enough.
Well, one can see things different.
WiNRADiO allows 64 kHz (!) USB bandwidth in the G3xDDC models.
ELAD allows 24 kHz, same as SDRConsole.
Sometimes this can be useful decoding certain digital modes.
Other SDRs alas only allow 3.6 or maybe 7 kHz. You can't even decode digital DRM radio (10 kHz needed) with these.
73, Heinrich
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dsalomon
Posts: 51
Joined: Sat Oct 10, 2015 1:50 pm

Re: Increasing USB bandwidth

Postby dsalomon » Mon Aug 08, 2016 12:59 pm

Examples of wideband digital signals:

OTH Radar: 28KHz
CODAR: up to 30MHz (that's NOT a typo...it is up to 30 MHz), but typically 50KHz
Multitone paging: 12.5KHz - 25KHz
PLUTO OTH Radar: 20KHz
Sepehr OTH Radar: 60KHz - 1MHz
CTCSS: 5KHZ - 30KHz
DAB (Digital Audio Broadcasting): 1.5MHz
The Emergency Alert System: 5KHz - 30KHz
EDACS (Trunked Radio): 12.5KHz - 25KHz
ERMES: 25KHz

So, there are a few examples of why >10KHz bandwidth could be used. Most of the examples I listed are radars that cannot be decoded. However, there are a few digital signals that can be decoded, if the bandwidth is appropriate. I play with digital signals a lot, and would love to see at least 25KHz bandwidth, either on USB/LSB or a DATA mode (e.g. Simon's SDR Console v2).

Best regards - David, AG4F
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