Welcome to the new FlexRadio Community! Please review the new Community Rules and other important new Community information on the Message Board.
If you are having a problem, please check the Help Center for known solutions.
Need technical support from FlexRadio? It's as simple as Creating a HelpDesk ticket.

Are you getting the best receiver performance out of your FLEX-6000?

Tim - W4TMETim - W4TME Administrator, FlexRadio Employee admin
edited May 12 in New Ideas
In order to get the best receiver performance out of your radio, you have to optimize the signal to noise ratio (SNR) based on band conditions and the ambient noise that your receive antenna is picking up.  Optimizing the receiver SNR is a fairly straightforward thing to do and it is done by making sure you have the RF preamp set correctly and, this is the real important part, you have the AGC set properly.  Properly adjusting the AGC is done by using the AGC-T control, which is an often overlooked feature in SmartSDR, but the most powerful one for mitigating noise and optimizing the receiver SNR.

A detailed description of how the AGC in SmartSDR works and even more importantly, how to properly set it is covered in the updated HeldDesk article How does the Automatic Gain Control (AGC) work in SmartSDR.

I highly recommend taking a look at this article as a properly configured AGC can make the difference between getting that weak on in the log or not.
9 votes

Open for Comments · Last Updated

9 votes

Completed · Last Updated

Comments

  • Neal_K3NCNeal_K3NC Member ✭✭
    edited March 6
    Another great article from the Hardest Working Man in Customer Experience!! Thanks you wooly bear you!
  • tparishtparish Technology Specialist Member ✭✭
    edited March 5
    THANK YOU TIM! I am so grateful for this. I've had my Flex about 9 months and love it. But I admit I'm not up to speed on how best to adjust my 6400M for best receiver performance. This came at just the right time.
    appreciatively
    Tom KB5RF
  • Mike-VA3MWMike-VA3MW FlexRadio Employee, Community Manager admin
    edited March 5
    That's my boy!  :)  This is awesome Tim.
  • Bill -VA3WTBBill -VA3WTB Member ✭✭✭
    edited March 5
    A very important article Tim. I always felt that the AGC-T is the least understood feature in SSDR.
  • HCampbell  WB4IVFHCampbell WB4IVF Member ✭✭
    edited March 6

    Agree that the AGC-T control is a very useful Flex feature.  Hope that there will be follow-on improvements such as an option for automated AGC-T, or at least a visual display of the AGC-T setting.

    Howard
  • Santiago Mejia - HI8SMXSantiago Mejia - HI8SMX Member ✭✭
    edited March 6
    Thanks Tim, as a new user (8 months) this article is invaluable.
  • Wilbur DoolittleWilbur Doolittle Member
    edited March 6
    Is there a you tube on this?
  • Neil D Friedman N3DFNeil D Friedman N3DF Member ✭✭
    edited March 6
    In FT8 mode, I set the AGC-T so that FT-8's green thermometer reads about 30 on a quiet band.  I set the AGC speed setting to "off."  Is this speed setting correct?
  • Tim - W4TMETim - W4TME Administrator, FlexRadio Employee admin
    edited March 6
    Good question. The answer is "it depends".  Setting the AGC to OFF turns off the AGC algorithm altogether so you have to be careful about how you set the AGC-T so that you are not adding too much fixed gain to the recovered audio.  Using SLOW enables the AGC algorithm and can be beneficial to reduce the volume when there is external short-lived noise sources such as lightning crashes.
  • Sergey R5AUSergey R5AU Sergey Member ✭✭
    edited March 6
    Neil, SDR provide high passband dynamic range and better do not use AGC at all with digital mods but utilize necessary filters for station selection. My AGC-T n Digi usually within 10-15 points without overloading receiver
  • Keith WA0BEUKeith WA0BEU Member ✭✭

    Thanks Tim, Great article!!!

Leave a Comment

Rich Text Editor. To edit a paragraph's style, hit tab to get to the paragraph menu. From there you will be able to pick one style. Nothing defaults to paragraph. An inline formatting menu will show up when you select text. Hit tab to get into that menu. Some elements, such as rich link embeds, images, loading indicators, and error messages may get inserted into the editor. You may navigate to these using the arrow keys inside of the editor and delete them with the delete or backspace key.