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SDRdou Diversity mode demo
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Paul Cianciolo
Folks,
I made a video using the SDRdou to see how well the diversity mode works when using the phasing to cancel station or an interference. The results are remarkable, if not a little difficult to attain. I used SDR-UNo for this experiment but if you have a SDRdou this might be on interest. Paul C W1VLF https://youtu.be/IMR5TwNQhMs |
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Siegfried Jackstien
That tuning of gain and phase remembers me to the phase and gain tuning of an i/q signal from an sdr. In principle its the same thing. Maybe two sliders would be easier.. Coarse tune with mouse.. Finetune with cursor (arrow) keys in very tiny steps?? Dg9bfc sigi Am 23.02.2023 20:27 schrieb Paul Cianciolo <paulc@...>: Folks, |
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sm6fhz
Thanks for a very interesting demo Paul !
It really shows the potential of this feature. If you have a semi local station on MW (e.g. within Europe from here) and want to listen to a Trans Atlantic (NA or SA) station you probably don't need 40 to 50 dB, just 10 to 15 dB of cancellation would help a lot. If the requirement is 15 dB of cancellation rather than 50 dB, the settings would be much more manageable. 73 / Ingolf, SM6FHZ |
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Paul Cianciolo
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From: main@SDR-Radio.groups.io [mailto:main@SDR-Radio.groups.io] On Behalf Of Siegfried Jackstien
That tuning of gain and phase remembers me to the phase and gain tuning of an i/q signal from an sdr. In principle its the same thing. Maybe two sliders would be easier.. Coarse tune with mouse.. Finetune with cursor (arrow) keys in very tiny steps?? Dg9bfc sigi
Am 23.02.2023 20:27 schrieb Paul Cianciolo <paulc@...>: Folks,
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If Perseus22 even materialises then I would look at this - to do it properly takes quite some time and Perseus22 would be a good SDR to use as it's a direct sampler, not a tuner chip solution. I just don't know how good a dual channel tuner chip is.
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of Siegfried Jackstien via groups.io <siegfried.jackstien@...>
Sent: 23 February 2023 21:51 To: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> Subject: Re: [SDR-Radio] SDRdou Diversity mode demo That tuning of gain and phase remembers me to the phase and gain tuning of an i/q signal from an sdr. In principle its the same thing.
Maybe two sliders would be easier.. Coarse tune with mouse.. Finetune with cursor (arrow) keys in very tiny steps??
Dg9bfc sigi
Am 23.02.2023 20:27 schrieb Paul Cianciolo <paulc@...>:
Folks, -- - + - + -
Please use https://forum.sdr-radio.com:4499/ when posting questions or problems. |
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Mark Cayton
Not meaning to jack this thread, I just want to post another example of Diversity mode in action. Here's a screenshot of my Anan 7000 running Thetis software with Diversity enabled. I was using it in this case to null out a local single-point source of wideband interference that had cropped up during the Texas ice storm a few weeks ago. I believe the noise was possibly caused by a tree branch that had fallen across a power line and strained a connection. Regardless, the noise in this case was wideband and constant, rendering the entire band pretty much useless.
I was able to easily steer a null in the direction of the noise source, no idea where the source actually was but I just played with the diversity phasing and gain until the interference was gone. The entire process took me less than 30 seconds. As you can see in the RX2 panafall, the interference is very strong across the entire band but it's completely eradicated in RX1. For reference, RX1 is connected to a tuned dipole and RX2 is connected to a wideband active mag loop running Everett Sharp's superb LZ1AQ amplifier. Mark |
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jdow
Inside MFC the arrow key steps are modified by control and shift. The tuning adjustments could employ the same sorts of modifications on the step size. {o.o} On 20230223 13:51:32, Siegfried
Jackstien wrote:
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Mark Cayton
Here's an even more extreme example of wideband interference caused by a single point source, and how effective Diversity mode can be in eliminating the interference.
Another storm came through last night and this is the result this morning. The lower receiver shows extremely severe wideband interference effectively rendering the entire band useless for any amateur activity. The upper receiver shows the interference totally eliminated, at least at the frequency of interest (7.235). It is important to note that the reduction is not total when viewed across the entire band (the interference is still visible at both band edges), but is tunable for max effectiveness at any desired frequency. Mark |
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