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Do I have a transmit problem with 1.5.1?

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Phil M0VSE
Phil M0VSE Member ✭✭
edited October 2019 in SmartSDR for Windows
Hi. 

I was one of the 6300 users that had distorted audio with 1.5 and was happy when 1.5.1 was released.

I have noticed with 1.5.1 that I seem to have a number of 'spurs' when I hit tune or otherwise transmit in SSB, There are no such artifacts when transmitting/tuning in CW mode however.

I wasn't sure if there were actually being transmitted or not so I thought I would try FDX mode and sure enough, they appear on the second slice. Am I right to be concerned about this?

Here are screenshots from SSB and CW mode.

image

image

73 Phil 

Comments

  • George KF2T
    George KF2T Member ✭✭✭
    edited February 2019
    Options
    Almost certainly not a problem. The weak (-90) "Spurs" are likely an artifact. I've seen them forever.
  • Bob K8RC
    Bob K8RC Member ✭✭✭
    edited October 2019
    Options
    While transmitting, drag the dbm scale down until you can see what your peak signal level is. You will probably find that the "spurs" are many, many db down.
  • Phil M0VSE
    Phil M0VSE Member ✭✭
    edited September 2016
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    On the screenshot below, the peak level is around -20db and the first spur at just under 50dB. SSB transmit on most bands seems to show that the spurs are just under 30dB below the peak signal. I was just interested to hear peoples opinions on whether this was to be expected? I am pretty sure that I didn't see this phenomenon with 1.4.6.

    image

  • Rob Fissel
    Rob Fissel Member
    edited October 2015
    Options
    In this picture, your mic drive level appears to be off the charts, with some pretty heavy compression on top of it. You might want to back off the mic gain and see if that improves anything at all. You should avoid tripping your ALC at all costs. 

    For a quick view of an appropriate audio drive level when using a mic, check out Ken's video tutorial that he posted up yesterday. You'll notice his audio levels never even come close to tripping the ALC while he transmits in SSB. 

    FWIW, I have a 6300 and haven't had any issues with 1.5 or 1.5.1 (other than the malfunctioning frequency offset calibration problem that's well documented here). 
  • Phil M0VSE
    Phil M0VSE Member ✭✭
    edited September 2016
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    Yes I was trying to see how bad I could make it and was basically shouting into the mic but even turning processing off and speaking not letting the mic input peak, it is much the same.

    As a professional audio engineer, I think I am ok with gain structures though :)

    It does make me wonder why the 1.5.0 transmit problem only affected some users though and maybe these transmit "spurs" don't happen on all 6300s either?

    73 Phil

    image
  • Jay Nation
    Jay Nation Member ✭✭
    edited August 2016
    Options
    Can you do another one at an even lower mic gain level that isn't driving the peak indicator past 0dB into the red?

    73, Jay - NO5J
  • Phil M0VSE
    Phil M0VSE Member ✭✭
    edited September 2016
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    I would but interestingly now the Flex has been running for a couple of hours, I am not seeing any 'spurs' at all..... I will reboot it and see if I can make it happen again!
  • Mike NN9DD
    Mike NN9DD Member ✭✭
    edited December 2016
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    Turn down your power to 1 watt. I'm a couple,of,the pictures you are transmitting on ant 1 and putting out slider power which appears to be around 30. You might be overloading the receiver
  • Phil M0VSE
    Phil M0VSE Member ✭✭
    edited September 2016
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    Yes I noticed that after I posted the picture but it seemed to be the same regardless of what power I was using. I was moving round different bands and didn't always remember to reduce power......
  • Tim - W4TME
    Tim - W4TME Administrator, FlexRadio Employee admin
    edited March 2017
    Options
    I have converted this topic to a support HelpDesk ticket (http://helpdesk.flexradio.com) for expedited issue resolution.  If anyone else is experiencing an issue similar to this one, please submit a HelpDesk support ticket for issue resolution.

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