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Tim explains S Meters

Mike-VA3MW
Mike-VA3MW Administrator, FlexRadio Employee, Community Manager, Super Elmer, Moderator admin
edited August 2020 in SmartSDR for Windows
I invited Tim to explain why and how an FlexRadio S meter calculates its values and why it is different than a traditional superhet radio.


https://www.youtube.com/watch?v=GQdjoY91pyY

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Comments

  • Neil Friedman
    Neil Friedman Member
    edited June 2020
    Great video.  Tim needs a haircut.  
  • KY6LA_Howard
    KY6LA_Howard Member ✭✭✭
    edited June 2020
  • Andy W3LI
    Andy W3LI Member ✭✭
    edited June 2020
  • KD0RC
    KD0RC Member, Super Elmer Moderator
    edited June 2020
    Well explained, thanks!
  • Rick WN2C
    Rick WN2C Member ✭✭
    edited June 2020
  • Jim Gilliam
    Jim Gilliam Member ✭✭
    edited June 2020
  • Ian1
    Ian1 Member ✭✭
    edited June 2020
  • k0eoo
    k0eoo Member ✭✭✭
    edited June 2020
    Turn on one or more of your preselectors, 10, 20dB ...  That should lower the noise floor...
  • Jeff_W4DD
    Jeff_W4DD Member ✭✭
    edited June 2020
  • k0eoo
    k0eoo Member ✭✭✭
    edited June 2020
    Yeah, I forgot, reading the scale on the right vs reading the S-meter give two different numbers.  the S-meter reading is the rms sum of the data bins in the passband of the slice receiver, for SSB the passband may be 2.7kHz so the reading will be much higher, if you go to CW and select a 50Hz bandpass, the S-meter reading should come close to the scale on the right... make sure to put change the S-meter reading to dBm for comparison.
  • Neal_K3NC
    Neal_K3NC Member ✭✭
    edited June 2020
  • Robert Lonn
    Robert Lonn Member ✭✭
    edited June 2020
  • Brian Denley KB1VBF
    Brian Denley KB1VBF Member ✭✭
    edited June 2020
    Nice looking 390A !
  • Rick WN2C
    Rick WN2C Member ✭✭
    edited June 2020
  • Andy W3LI
    Andy W3LI Member ✭✭
    edited June 2020
    That is my point from a previous post I made.
  • Michael N3LI
    Michael N3LI Member ✭✭
    edited June 2020
    Oh, we had some pretty good flamewars going a while back. Some folks were demanding inaccurate S-Meters. Not surprising that it was addressed in depth. Considering that the Japanese radio S Meters aren't all "calibrated" the same DB per S Meter, it was pretty amusing. 
  • Mike Krzystyniak
    Mike Krzystyniak Member ✭✭
    edited June 2020
  • k3Tim
    k3Tim Member ✭✭✭
    edited June 2020
  • Keith WA0BEU
    Keith WA0BEU Member ✭✭
    Thanks for the explanation! Great Video!

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