A second video showing SDRuno diversity s/w for noise cancelling

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jon
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Joined: Tue Jan 06, 2015 10:48 am

A second video showing SDRuno diversity s/w for noise cancelling

Post by jon » Thu Jul 18, 2019 11:18 am

ICAS Enterprises have just released a follow-up video which further explains what’s going on in their RSPduo noise cancelling demo using SDRuno diversity software - as described in a previous news update. ( details of the previous article are here: https://www.sdrplay.com/community/viewt ... f=6&t=4768 )

Click here to see this new video: https://youtu.be/ge7qcZgPvr8

This is the text which accompanies the second video:

How RSPduo/SDRuno V1.32 cancels out noise under a quasi environment-

When it comes to noise canceling, the same theory applies to both software and hardware noise canceling equipment. This time we have carried out an noise canceling experiment under a quasi environment for your easier understanding purposes.

Equipment used: RSPduo + SDRuno V1.32 NG (wide band noise generator) SG (signal generator – 14MHz)

Settings: NG’s output was equally distributed to Tuners 1 and 2. SG’s out put was loosely coupled to both Tuners 1 and 2, but Tuner 2 being less strongly coupled.

Explanations per time lapse:
0″-15″: Showing how each equipment is set out.
15″-22″: Showing SDRuno spectrum (Tuner 1) with both NG and SG tuned OFF.
22″-26″: Tuned NG ON, showing Tuner 1 spectrum.
26″-30″: NG being ON, switched to Tuner 2 spectrum.
30″-33″: Turned NG OFF. .
33″-37″: Turned SG ON, showing Tuner 1 spectrum.
37″-43″: SG being ON, switched to Tuner 2 spectrum.
44″-50″: SG being ON, switched back to Tuner 1 spectrum.
49″-55″: SG being ON, turned NG ON. The target 14MHz signal is barely readable.
55″-1’01”: Both SG/NG being ON, switched to Tuner 2 spectrum. The target 14MHz sig is NOT readable at all.
1’01”-1’15”: Switched to DIVERSITY mode. Tuner on APPLY AUTO, maximizing the noise.
1’15”-1’31”: Turned APPLY AUTO OFF, manually maximize S/N for the target sig. The burried sig can be now readable!
1’31”-1’39”: Again, Tuner APPLY AUTO ON to maximize the noise.
1’39”-1’47”: Turned APPLY AUTO OFF, and manually maximize for the best S/N.
1’47”-1’49”: Turned SG OFF, the target sig gone, but the noise floor level kept unchanged.
1’49”-2’12”: Cycling NG ON/FF. Both ends of the spectrum slightly went up and down.
2’12”-end: Repeated tuning APPLY AUTO ON and OFF.

Key to successful noise cancelation: Usually, the main antenna is connected to Tuner 1. It is advisable to connect to Tuner 2, such an antenna that can receive the noise at the same or slightly higher level as the antenna of Tuner 1, while the target signal should be weaker with Tuner 2 ant than with Tuner 1 ant. We have reproduced such an environment by making the SG output coupling to Tuner 2 weaker. We hear a lot of times “I cannot cancel noises using a hardware noise canceler (of a well-known make).”Most of the cases, the noise level introduced into the canceler is too weak, so it will not effectively cancel out the noise in question received on the main antenna. Should the noise strength received on your noise pickup antenna be a little too strong, you can reduice the level with the RF GAIN of T2 on the MAIN window of the SDRuno.
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