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.

Mic levels: FM versus other voice modes

k3Tim Member ✭✭✭
edited December 2016 in SmartSDR for Windows
Running SSDR on a 6500 and listening to the Xmit signal with a Ten Tec RX-350 receiver (no overload to rcv!).  In AM / SSB modes the audio from a Heil PR-40 ->Tube preamp -> Balanced input  sounds very good ("that +20dB mic gain" : OFF).  FM is a different story, hardly any audio / modulation.   Using a Ten Tec-707 mic to the mic input with "that +20 dB Mic preamp": ON the audio quality on all modes is outstanding.  

In summary, FM XMT modulation seems to only work well with the Mic input and not other inputs.
Has anyone else observed this?

Doubtful it's RFI related as testing was at 2 watts and other modes had no problems at 2W to 100 W.  Also the mic input worked fine with FM  @ 100W.

Thanks for any insight...

Note on AM XMT:  Someone posted comments about the XMT AM not sounding good on the 6K series.  Well this particular box sounds like broadcast quality AM!  I heard a 3k series on 80-M and the gentleman had outstanding AM quality.  When using a linear one has to be super careful, but I think we all know that.


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.