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SSDR 6m tx envelope ( jt65/jt9 ) anomaly

km9r.mike
km9r.mike Member ✭✭
edited December 2017 in SmartSDR for Windows
For 160 -10m, my tx envelope for wjst-x (jt65 or jt9) looks like the following. Nice clean purty.

image



I have recently been fooling around with wjst-x on 6m and made my first qsos on 6m kinda ( well at least I got a replies via psk reporter )

image

However, despite the positive result with 20w and an OCF dipole at 35ft, I noticed that the tx envelope on SSDR using wjst-x displays differently on 6m. There appears to be no negative consequence because of this , but I do not understand why this displays differently on 6m.

image

Do other users see the same ?

Thanks

Answers

  • Tim - W4TME
    Tim - W4TME Administrator, FlexRadio Employee admin
    edited December 2017
    It is because you have the RX preamp turned on for 6m
  • km9r.mike
    km9r.mike Member ✭✭
    edited May 2016
    100% correct and this was not a test. Thanks for the help Tim. 6m preamp off and voila.

    image
  • Tim - W4TME
    Tim - W4TME Administrator, FlexRadio Employee admin
    edited December 2016
    And for the record, this is not a "bad" thing.  The reason why is that the radio is receiving the actual transmitted signal and for display purposes, additional RF pre-amplification is not needed.
  • km9r.mike
    km9r.mike Member ✭✭
    edited May 2016
    Yes that is the way I took it. No worries here. Just a better understanding and something I should have been able to determine myself but this was throwing me for a loop until you turned the light switch on.
  • EA4GLI
    EA4GLI Member ✭✭✭
    edited November 2016
    You are supposed to use low power for JT.... :) I guess the 100w was for the test.
  • K1UO Larry
    K1UO Larry Member ✭✭✭
    edited December 2016
    looks like about 20 watts to me????  I do have bad eyesight..  but not that bad ....  at least I didn't think so!   :)
  • EA4GLI
    EA4GLI Member ✭✭✭
    edited November 2016
    LOL, you are right, I was looking at the RF Power slider

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