Hi Simon, Richard, and all,
As Bill stated, the phase of an FT8 signal is continuous. The first
derivative of phase (i.e., the frequency) has discontinuous steps at
symbol boundaries.
The attached plot shows the average spectrum of ten simulated FT8
signals carrying different messages. Sma
Afer performing web info list of "good" adjustments, how can i verify that
it is performing as "practically should be", not absolute perfect.
1. I checked the audio in wsjtx spectrum. What "click" on the slider is how
many dB per division?
2. For local transmission to dummy load and received 3 fo
On 07/12/2018 12:29, Richard Lamont wrote:
FT8 does not use Gaussian keying. Instead, the tone frequency is
switched instantaneously at a zero-crossing point. This produces a
wideband transient between symbols. It's comparable to frequency
modulating a carrier with a square wave.
There's also a
On 07/12/2018 02:46, Simon wrote:
> What is the guideline or specification for audio frequency signal
> attenuation outside of the 50Hz (plus and minus 25 Hz from centre) band
> width?
>
> For example, signal should be x dB below carrier, at frequency plus
> and minus 50 Hz from centre?
In
