Reducing Bandwidth for better RADE performance

[Alan Beard]

I can change the bandwidth for the SSB decoder in the WebSDR here.

What settings are recommended?

Currently 200 to 2800 Hz, Can I reduce this and improve the small signal

l

performance?

Alan VK2ZIW

[Rick, W4XA]

Hi Alan, 

I use 1.5kHz (BW) for receive and 500-2000 Hz tx with my IC705

73/Rick

[Rick, W4XA]

Correction:  500-2500Hz with SSB-D for the IC705 tx bandwidth (2000Hz) 

[Stefan N.]

750-2250 Hz would give you the intended 1.5KHz of the RX Signal. Often a problem to (easy) setup this on non SDR Radio's, if you use SSB for FreeDV, like i do on the 991a. 

It’s easy to adjust that on WebSDR‘s (and SDR Radios) and helps, if you want to cut of QRM below, or above the 1.5Khz FreeDV „mainstream“.

73, Stefan

[Alan Beard]

I've reduced the bandwidth to 700 to 2300Hz and decode seems as good as before.

Nepean Mens Shed SDR

Alan VK2ZIW 

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[Rick, W4XA]

Yeah.  It would.  500-2500 is the SSB-D selectable limit on the IC705.   Don't know about the IC7300 or other radios.

[Alan Beard]

Stations heard with this new setting, 700 to 2300 Hz, over an hour of QSOs.

VK3FAR VK3AOB VK2VCO VK3AOB VK2VCO VK3AOB VK3AOB VK2VCO VK3FAR
VK3FAR VK3AOB VK3FAR VK3FAR VK3SRC VK3FAR VK3SRC VK3FAR VK3SRC
VK3FAR VK3SRC VK3FAR VK3SRC VK3FAR VK3SRC VK3FAR VK3SRC VK3FAR
VK3SRC VK3AOB VK3AOB VK3AOB VK3AOB VK2VCO VK3AOB VK2VCO VK3AOB
VK2VCO VK3AOB VK3AOB VK3AOB VK2AWJ

This is from the freedv-ka9q log.

Alan VK2ZIW