71816Re: ensamble tx on both sidebands at the same time
- Jan 20, 2013--- In firstname.lastname@example.org, "PAUL" wrote:
>I just ran into this while testing my Ensemble RXTX a couple of days
> Thanks Alan
> Using the meter on ac is a good tip
> Looks like I have signal where I expect it
> Think I will lift out T2 next
> --- In email@example.com, "Alan" wrote:
> > ----- Original Message -----
> > Subject: [softrock40] ensamble tx on both sidebands at the same time
> > > Any one had this? Receive works perfectly but I am transmitting on upper and lower sideband at the same time. I have changed sound
> > > cards and confirmed that the output is stereo. I also noticed that I could not set the tx channel skew calibration in HDSDR as it
> > > had no effect.
> > >
> > > I guess I need to look at the TX mixer, could I have wound one of the transformers incorrectly to cause this?
> > >
> > Paul,
> > You are certain you have two signals in and no shorts between them?
> > It is possible T2 is at fault.
> > If your meter AC range is specified to 10KHz, many are, then TX close to centre and check that the 4 opamp outputs are much the
> > same.
> > 73 Alan G4ZFQ
I was using the mic input to the sound card and the line out to the rxtx
I could transmit, but after looking at it with a spectrum analyzer,
I was transmitting DSB.
Turns out the Mic input was not being processed by the software
When I looked at it with an oscilloscope, the two channels were in
phase on the sound card line out.
Hope this helps,
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