New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Filter BW for TX is capped at a max of 2.4kHz #56

Open

jokubasver opened this issue Sep 26, 2021 · 0 comments

jokubasver commented Sep 26, 2021 •

edited

Loading

0 Hz - 5kHz sweep test while transmitting into a dummy load using different Filter BW settings:

As you can see, Full, 3kHz, 2.4kHz don't do anything - the radio still transmits with a bandwidth of 2.4kHz. Setting it to 1.8kHz finally does work.

Also, frequencies higher than 2.4/1.8 kHz fold over (is aliasing the right term here?) and therefore the spectrum does not look clean.

Is the TX filter BW cap of 2.4kHz intentional or is this a bug?

Settings used:
TX Drive: 2
Noise gate: 4
PA min bias: 0
PA max bias: 128

Software and hardware:
v1.02w firmware
DL2MAN sandwich

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment