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Is it feasible to construct a vacuum tube AM receiver capable of tuning into the VHF or even UHF bands?
If so, how? If not, why not? This is for all the hams and amateur radio techies out there.
Wow, great question...
It was generally not done, only FM was/is used in the VHF and UHF bands. You typically only see AM in the SW bands and up to 30Mhz (is this still SW?). I think VHF starts around 50Mhz and is where TV begins (less channel 1).
So your question is can a reciever decode an AM signal on those higher frequencies... simple answer is YES but it's not practical due to the fact that higher frequencies tend to become "line of sight". ie, they do not curve with the earth or bend around structures. So I would think that normal everyday interference would alter the Amplitude of the Carrier you are receiving, increasingly so on the higher frequencies.
If you are considering a mobile type transmiter/reciever then just forget it, as you drive the carrier amplitude will peek and plunge as you pass buildings if it were tuned to VHF. Hence the need to go to Frequency Modulation (FM) on those higher bands.
This is just my best guess... I would love to hear some HAMs opinion on this.
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