[time-nuts] Propagation delay within analog radio, (Radio Shack Timecube) and an SDR, at HF

Alberto di Bene dibene at usa.net
Sun Dec 3 05:46:40 EST 2017

Message resent... I had forgotten that this group is HTML-fobic....

On 12/3/2017 12:22 AM, jimlux wrote:

> In SDR implementations (obviously not the Timecube) the latency can be
> quite long, and can be variable. Most SDR implementations don't pay much
> attention to RF/Baseband delays as long as the pipeline doesn't run dry.

It also depends whether the audio output is done using the PC sound subsystem, or instead the
SDR has its own DAC. For example, the Elad FDM-DUO, when used stand-alone, without a PC, has
a latency that judging by ear is not distinguishable form that of an analog radio.
Same for the HPSDR Ozy+Mercury combo, when the DAC on board of the Mercury is used.
Only when using Windows or Linux for the rendering of the demodulated audio you can have
hundreds of milliseconds of latency.

73  Alberto  I2PHD

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