Re: how to set bfo
Rod Self <km6sn@...>
Thanks. I dug into the software and found out how to get into setup. OK now.
r.e. the BFO - as you know, the receiver on a ubitx is a 12 MHz fixed-frequency receiver. USB/LSB switching is done in the previous mixing stages. Using band-noise as a wideband signal source, if one views the ubitx audio output on an audio spectrum analyzer, it should be quite easy to set the BFO frequency to a desirable setting.
On Linux there is a great open-source audio spectrum analyzer called JAAA. On garden-varitey USB sound cards you can see at least an 80 db range. I will use JAAA to view the ubitx audio spectrum and set the BFO accordingly. Then, in the ubitx.ino code, one can tweak the SECOND_OSC_USB and SECOND_OSC_LSB constant definitions to achieve balance when switching sidebands.
I am sure there are useful audio spectrum analyzer programs for Windows and Mac, which would work equally well.
That is my plan for today; I will travel to my shop and will let you know how it works out.
On 01/10/2018 08:59 AM, Dave Bottom wrote: