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 refer to the product documentation or check the Help Center for known solutions.
Need technical support from FlexRadio? It's as simple as Creating a HelpDesk ticket.

How I am now using Full Duplex to monitor my SSB and AM Audio Adjustments....

Ken - NM9P
Ken - NM9P Member ✭✭✭
edited June 2020 in SmartSDR for Windows
This is the first of several planned posts about using some of the new features on SSDR V. 1.5.

Ever since I got my 6500 I have monitored my audio on my Flex-1500 in order to fine-tune my SSB audio.  I use it both live and as an RF recorder..  Recorded audio is superior because I can record several samples on the 1500, then loop several of them together and listen for differences in performance, readability and "comfort level" of the received signal.  It also isn't subject to "in-head" distortion due to **** conduction while I am talking.

In the previous release (1.4.16) they gave us the ability to record our own audio and play it back post-processor, filter & EQ.  This was a very welcome feature, but I still usually used my trusty 1500 because I could make live adjustments while listening and then make a final recording to listen to without my headphones.

Now that 1.5 has been released, I may now have no reason for the 1500.  I can use FDX to listen to my own signal while testing.  Here is how you can do it, too:

1) Run the tests at lowest power, into a dummy load.  Better yet, set your TX antenna to "TRANSVERTER"
2) Open slice A to a frequency on a quiet band.  (I use 6 meters, above regular use frequencies in order to avoid other signals in the receiver..
3) Open a second slice (B) and set to the same frequency and mode.  Use the bandwidth you expect people to use while listening to your signal.  (or a little wider)
4) Set TX to slice A on Transverter
5) Set RX to Slice B on an unused antenna port (Either B or RXA on a 6500)
6) Mute receiver on Slice A
7) Engage Full Duplex (FDX)
8) Keep your speaker level low to avoid feedback, or better yet, use headphones and mute the speaker.
9) Before transmitting, double check to make sure that you will not be transmitting high power or to an antenna.
10) Begin transmitting and making adjustments. 
11) Be sure to save any new TX Profiles.
12) Be sure to return your rig to normal antenna settings when finished.  It will save you a lot of grief later...

NOTE:  There WILL be a delay in your monitored audio.  Until you get used to it, it may scramble your brain while you talk.  Once you have done it a while you will get used to the delay and begin to ignore it.  (Until then, the delay can scramble your thoughts and make you sound like an idiot...which is another reason you don't want to do this over the air!) 

Depending upon the power level selected for the transverter port, my receive signal is anywhere between an S9 and S9+30 dB.

I have tried listening to myself by transmitting on my HF antenna and listening on the transverter port.  It worked OK, as long as the power was kept low.  If I got about 5 or 10 Watts while listening on my own frequency the receiver began to overload and distort rather badly.  I could do it quite nicely at 1 Watt.  With the 6000 series it doesn't matter, since the transmitted signal is virtually identical at 100 Watts as it is at 1 Watt.

Having experimented with this for a couple of days, I am satisfied that I am getting an excellent sample of what my transmitted signal sounds like.  In fact I am sufficiently satisfied that I am now thinking of putting my 1500 on the market to help pay for an amplifier, (or perhaps a Maestro?)  I never thought I would say that.

Thanks FRS!  Now I need a couple of transverters so I can do full duplex satellite!

Comments

  • Al K0VM
    Al K0VM Member ✭✭✭
    edited June 2020
    Ken,
     I like your idea... To extend it, after you have set up this test configuration, you could save it as a global profile ( mic test) and export it so that it is easy to get back to in the future..  And save your TX profile once you have the mic tweeked.

    AL, K0VM
  • Rob Fissel
    Rob Fissel Member
    edited June 2020
    Thanks for this, Ken.

    One little thought to help alleviate the delay when listening to yourself, should it cause you a problem. For whatever reason, my brain crawls to an absolute halt when I hear myself on a half second delay, and it prevents me from speaking normally. 

    Audacity is a free open source audio editing and recording program that many here use to record themselves for voice keyer contesting purposes.

    Assign any DAX channel of your choice to Slice B, and select that DAX RX channel as your input in Audacity. Disable MON if you desire in SSDR, hit record, and transmit away. 

    Another option recently mentioned here is using OBS (Open Broadcast Software). Great free open source program that will capture your screen or individual programs, along with high quality audio (up to 2 sources). Slightly different execution in that you'll be routing your DAX RESERVED AUDIO RX "X" as your input of choice in this software. 

    Rob K2RWF
  • Ken - NM9P
    Ken - NM9P Member ✭✭✭
    edited December 2016
    Good Idea, AL.  I hadn't thought about using a Global Profile to save the AUDIO TEST setup .
    I don't use Global Profiles much.  On the other hand, I DO use many TX Profiles.  Now I can quickly fine-tune them with only my 6500. 
  • Ken - NM9P
    Ken - NM9P Member ✭✭✭
    edited December 2016
    Another Good Idea, and a great way to capture multiple profile samples for later evaluation.  I will give it a try.  I already have been using Audacity for other purposes. Now I have another purpose for it. Thanks.
  • Ken - NM9P
    Ken - NM9P Member ✭✭✭
    edited December 2016
    I just tried it and it works well.  Too bad there isn't an easy way to post an MP3 to this board or I would send samples of my Rag Chew and DX Profiles recorded via this FDX and Audacity. 
  • Rob Fissel
    Rob Fissel Member
    edited September 2015
    Sounds great. Try also playing around with OBS. Really easy to use, and then you have video to accompany that will also show your settings. 

    You could always upload your MP3's to Dropbox, and share the link URL here as another option. 
  • Al K0VM
    Al K0VM Member ✭✭✭
    edited December 2016
    Does the video icon just below this boards entry window not work for mp3 ?
    AL. K0VMimage
  • Ken - NM9P
    Ken - NM9P Member ✭✭✭
    edited June 2020
    I just posted a Video tutorial on this subject.
    I hope it is helpful.
    https://youtu.be/CzT1qDKKySk

    Ken - NM9P

  • Simon Lewis
    Simon Lewis Member ✭✭
    edited October 2015
    thanks Ken - Def gonna play about this weekend with the Heil Pro 7 now

    thanks for the tips and ideas

    Cheers
    Simon

  • Kevin LaFata
    Kevin LaFata Member ✭✭
    edited October 2015
    Great video!  I would love to see (and hear) some of the other sound profiles too. Your explanations of where to adjust the EQ for things like "bringing out the vowel sounds" were something I've never seen explained so clearly before.
  • ON5AM
    ON5AM Member ✭✭
    edited June 2020
    ken, Great job. I understand too how adjustments my audio. Tell me just how keep the profil of my micro because I have always "default, pr781..." but in my shack I have an NT2A and NT200 with other caracteristics. Thanks
  • Ken - NM9P
    Ken - NM9P Member ✭✭✭
    edited December 2016
    Thanks... In the profiles tab, you can select "save transmit profile". It will ask you for a name. Give it a new name and hit "save" and you should be done. Remember...every time you change something in your transmit profile, you will need to save it again, or you will lose the changes when you change the profile to something else, or when you turn the radio off. You can also create multiple transmit profiles and give them all different names. Does this answer your question?
  • Simon Lewis
    Simon Lewis Member ✭✭
    edited October 2015
    Ken I have 2 Flex 6500's .. I assume you an export and import from different radios??


  • Ken - NM9P
    Ken - NM9P Member ✭✭✭
    edited December 2016
    Yes. I am assuming that tx profiles can be exported from one 6500 and imported by the other. I see no reason why you shouldn't be able to do that. If this is in error, I am sure FRS staff will correct me. I am not sure about cross-model export/import. I would hope that TX profile info could be shared from one rig to another. The rest of a global profile may be another story, since they don't share everything in common. If sharing of profiles is not currently possible, it would be a great addition to the profiles manager.
  • Simon Lewis
    Simon Lewis Member ✭✭
    edited October 2015
    thanks Ken

    yes it does .. will give it a try tomorrow as my 2nd 6500 is away at the remote site where we are building a new house

    Sharing the profile info between machines would help for sure!

    Thanks for this and the video :)

  • ON5AM
    ON5AM Member ✭✭
    edited November 2016
    You make a good job for the community. Thanks for lighting and the video is perfect too. Ken can I explain in my web-side http://on5vl.e-monsite.com/ your
    ingeniousness, in french of course ?

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.