21-09-2018, 10:29 AM
I'm reminded of an idea I played around with some time ago but, as far as I can remember, never posted anywhere.
There have been a couple of requests in the past for help in producing signals on two adjacent channels - B4 and B5 come to mind.
The problem is that this will require a VSB modulator for the lower channel.
One day I stumbled on the spec for an 8MHz channel pass SAW filter, which prompted the idea. It was to construct an IF modulator using such a filter - recovered from a scrap DTV Set Top Box, perhaps - then add a local oscillator to up-convert the IF signal to the required channel.
What does the team think?
There have been a couple of requests in the past for help in producing signals on two adjacent channels - B4 and B5 come to mind.
The problem is that this will require a VSB modulator for the lower channel.
One day I stumbled on the spec for an 8MHz channel pass SAW filter, which prompted the idea. It was to construct an IF modulator using such a filter - recovered from a scrap DTV Set Top Box, perhaps - then add a local oscillator to up-convert the IF signal to the required channel.
What does the team think?
