I'm trying to diagnose a TV reception problem on a media PC. There are many things that can possibly go wrong. The one I'm interested in at the moment is signal strength.
I do not have a signal strength meter. I'd like to know if my signal is too strong, or too weak. Is this easy or interesting? If it is boring I will just buy a meter from Jaycar. If it is interesting I will have a play around. If it is very simple I will just do as I'm told.
I have a bunch of components, breadboards and test equipment. But no signal analyzer, and little skill and imagination.Can anyone offer some pointers? The interesting signals for me are DVB-S and DVB-T. I do not know the specific frequencies off the top of my head, but I can look them up and let you know if that is important information (and I expect it is)
Going back to square one, the "S" in DVB-S stands for "Space"--so it is a satellite delivered signal,probably at aroung 15 GHz or so.
DVB-T is the plain old "Terrestrial" service delivered on VHF & UHF frequencies up to around 800 MHz.
Signal strength meters for each service have very different requirements in both frequency range & sensitivity.
If you are in the primary service area of a Terrestrial TV site,you can probably make up a meter with a germanium diode,a 50uA meter & a few other bits,which will give you a reading combining all the signals within the frequency range & angle of vitew of your TV antenna.
This will not allow you to discern the signal strength of any of the signals by themselves.
Satellite downlink signals are another kettle of fish,however.
The signal strength will be very much lower,so your device needs to be much more sensitive,which implies active devices,circuitry designed for microwave frequencies,& so on.
Satellite downlinks usually have a Low Noise Converter mounted at the dish (& yes,you will need a dish),which converts the incoming signal to a lower one which will pass through the coax cable with less losses.
This IF signal,may,or may not be within the operating frequency range of the simple meter suggested above.