RX-666 Too Much Gain

[BM46]

Simon bonjour
First of all, un little story.
Mon RX-666 Dragon-Fly broke down after 7 days of use.
Can't identify it by SDR Console, more recognized by USB.
Lusya, Aliexpress Company, has me commercially and graciously replaced my SDR (after returning it at my expense to the supplier)
Transportation delays - France China 11 days, China France - 9 days
Now, received, it's a new SDR that I was sent free of charge and without transport charges back.
I started it, it was recognized immediately and works in all modes.
But, still due to my very good antennas, the SDR saturates, even with a setting of the Visual Gain to 20. (Same phenomenon identical and already evoked with my Airspy R One or categorically you refused to evolve the Visual Gain down)

Another point. When I settle through the View, Scale, High tab in Auto mode, there is a phenomenon of regular image hopping, not just with the RX-666, but with all the different SDRs I use. Do you have a way to reduce this phenomenon?

In addition, for information, it is frankly not useful to have a preamp on this type of SDR, yet it was planned and mounted on the model RX888.
On one of the three Screenshots provided, it is in operation with a -10 dB attenuator and this is more fun to watch.

It would be nice tore-deduct the gain again for the RX-666.
Sorry to get too much signal Simon!
Thank you for taking the time to read me.
Best regards

Bernard

[VK5HI]

Bernard,
Just looking at those three graphics I cannot see what I believe to be very strong signals or instances of too much gain, so cannot totally understand your problem.
However I did note is that you have the Wideband DSP Noise Blanker Enabled in all cases. I have experienced on occasions that when I have had this blanker enabled it can cause "overload issues" if not correctly adjusted.
73 de Colin VK5HI.

[BM46]

Thank you for answering me Colin.
Even with the noise blanker stopping I'm in the same situation
I have several Airspy HF +, Airspy Discovery, ELAD FDM-S2, Lime USB, Flex-1500 and now RX-666 SDRs and very soon a new one
I have been able to notice now for several years the operation of these different SDRs, I can see certain more or less strange behaviors due to the hardware but also to the program and also to the behavior of the user
The best program for a pleasant operation and that SDR Console of Simon.
But nothing is obvious and it is for this reason that there is a possibility to communicate and thanks in addition to this last forum.
Everyone has these sensitivities and can improve their experience
Have a good Sunday and we look forward to hearing from you Colin
Very good DX Colin
73 Bernard

[Simon G4ELI]

Hi,

There's no gain in the 666 - only attenuation before the ADC. As Colin suggests, remove the wideband DSP and let it run...

[BM46]

OK I have removed the DSP wideband.
But not great
Here are two screenshot
1 RX-666 to 0 from Visual Gain
2 RX-666 to -20 from Visual Gain

[Simon G4ELI]

That is NOT too much gain! Adjust the Spectrum area high and low. The signal levels are good.

[jdow]

BM46, you should be aware that the Visual Gain does nothing with regards to SDR saturation. All it does is digitally shift the values on the screen so you can, more or less, calibrate the scales. On HF with a good antenna turn on any attenuators in the RX-xxx you have, at least for the lower frequencies. For any frequency on HF a preamplifier is a ripoff.
{^_^}

[BM46]

Thank you for your information jdow and very happy to give me the hook regarding the Visual Gain.
As you point out so well" the Visual Gain does nothing with regards to SDR saturation.
All it does is digitally shift the values on the screen so you can, more or less, calibrate the scales. ."

Why not harmonization of Visual Gain values!

In order to be able to make a true comparison of reception values, it seems to me that with the same software, the setting values must all be the same to get a good reception comparison.
Currently this is not the case.
The settings ranges of the Visual Gain are not the same for the SDRs in my procession.
Airspy R1 Visual Gain - 30 - 30, I'd like to - 40
Airspy Discovery Visual Gain - 40 - 30
Airspy HF Visual Gain - 40 - 30
ELAD FDM S2 Visual Gain - 40 - 30
Lime USB Visual Gain - 70 - 30
RX-666 Visual Gain - 20 - 20, I’d like - 40 - 30
I think this great software should have to see the same ranges of the Visual Gain setting to allow a good comparison of listening on the different SDR supported by SDR Console
This is my way of approaching this particular point.
No reproach, only a statement.

Why not a harmonization and Visual Gain values, Simon!

73 Bernard

[jdow]

That is entirely up to the user if you want it meaningfully calibrated. All Simon can do is make an educated guess based on ONE sample on a system that may have considerable variance between units. Not all systems would have that. But, to be consistent setting it up for yourself means you will at least be consistent between different units you have. All Visual Gain does is shove the display around for YOUR convenience, which may include calibration or intentional de-calibration. (When I give honest reports hams suddenly stop talking to me.)

{^_^}

[BM46]

jdow, what is your first name and location?
Before we go any further in this subject
In the site https://www.sdr-radio.com/console to the Console tab
The feature - Visual Gain doesn't appear!
Simon, could define and comment on this feature
Maybe also insert it in this educational and very interesting post of your site
Thanks in advance
Best regards
Bernard