max-bit wrote: A tunable filter would be too "coarse", of course it would be gratuitous, but it would be an excess of form over substance.
Unless someone wants to do DX on DAB+, in which case a general amplifier filter is made first, then a narrow-band tunable filter and once again amp, then we have approximately +40 dB of gain with narrow-band filtering.
If we combined it with a directional DAB antenna, things would get bigger.
Then all that remains is to set up a DAB DX club
I have been interested in a BPF tuned with varicaps for a long time, although as an alternative one could consider mechanical tuning.
max-bit wrote:
Added after 2 [minutes]:
Although there is a small problem how to synchronize it with the receiver... (scan function).
Read the frequency from the heterodyne leak or simply connect to the head bus (assuming this is a solution with an external head and e.g. I2C for tuning).
I have a huge reservation about DAB(+) and I wonder if it makes sense since it is (probably) the same stream as on the Internet.
By the way, I`m curious about threats - the government recommends having a radio receiver, but I haven`t been able to find any requirements regarding it - whether it should be able to select DAB(+) or not.
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