On Mon, May 12, 2025 at 06:06 PM, Jarek SP9HGN wrote:
It can now be fixed in new GUI by adjusting output gain in settings, but from my observations - I need to set different output gain to achieve 10W power output in different modes (SSB/CW vs AM/FM).
My suggestion: maybe you should introduce separate output gain settings per each mode?
Well, FM (100%) and CW (90%) levels inside firmware is not depends on some hardware. I and Q for FM is a result of sin and cos - so it can be from -1 to 1 only, it doesn't depends on the input signal level.? I don't dive deep to CW, but looks like it just read some predefined signals (sine and cosine for I and Q). Here I might be wrong.
AM I and Q is a constant (carrier) + signal.
SSB output level is only depends on the input signal.
So, if you achieve normal output for SSB with some value of the output gain and the same value produces only 1W of output for FM - that mean that values of the input signal on my radio is significantly lower.
?
I guess it might be due to different sound codecs. Both are 24 bit, but one of them put these bits at the beginning of the 32 bit word, and another - at the end during analog-digital conversion. Same for DAC.
But for 8 bit difference output level difference should be ~48 dB.
?
How much output gain you use to achieve 10W on FM with low ALC?
--
Georgy // R2RFE
