Figure 1:
Relationship between input and output signal level WITH (A-->D-->F) and WITHOUT
(A-->B-->C) an automatic gain control (AGC) with an indication of some of the WDSP
AGC parameters that can be controlled by the user. Inspired by a paper by Phil Harman:
“A discussion on the AGC requirements of the SDR1000” (I added the relevant AGC
parameters for better understanding).
If you want to know more about how your AGC works, please read this paper and use
figure 1 above to understand how the AGC works: Phil Harman (VK6APH): A discussion
on the Automatic Gain Control (AGC) requirements of the SDR1000.
-
http://www.flexradio.com/downloads/vk6aph-agc-discussion-powersdr-pdf/
This paper is excellent, fun to read, instructive and essential for the full understanding of
the functioning and the perfect adjustment for the WDSP AGC.
Because Phil has explained the AGC so well in his paper, I will now restrict myself to the
explanation of the menu adjustments of the parameters implemented in the mcHF
firmware and assume that the reader is well informed about how these parameters
affect the AGC functioning.
AGC WDSP switch
choose between “Standard AGC” and “WDSP AGC”: please note that the S
-Meter in old
school style does not work when switched to “WDSP AGC”: the S
-Meter is automatically
switched to be based on dBm instead.
