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The background hiss is worse than the hum. Your audio gain distribution is still whacked. Don't blame it on A to D sampling of your PC, your audio is horrible. Follow advice given in previous threads. Have you done a signal/noise test of the radio? At any rate, building a radio that works is an accomplishment so be proud. Still love me?
What do mean? The damn thing is decoupled. He said decouple the base, so I asked him what he meant.....choke it? I got no answer.
Anyway it is clean as a whistle, no hum on battery. So yeah, A better power supply could be in order.
Don't tell anybody but I actually listen to AM radio news and traffic reports in my car. Its frequency response is from about 60Hz to about 3kHz at -3dB and it doesn't sound TOO bad. I think the AM radio stations have a peak at about 4khz so it sounds a little crisper. There is no noise what so ever except in a lightning storm and when I drive past crackling high voltage transmission lines.
I don't call all that noise, "communications".
The voices are extremely narrow-band but the noise is wide-band.
It would sound a lot better if the audio response went to 3kHz or 4kHz and there is no noise.
I'm glad I have you guys technical ear. Even Nigel though he can be a P_____ at times....lol.
I've never even listened to the files, I know what SSB and AM sound like, and your's are going to be no better (and most probably worse - as you have no proper filtering, and really poor design).
But it's about COMMUNICATION, not QUALITY, anyway - but the limitation should be on the transmission and the path, not in the receiver.
Steal a 600Ω transformer out of an old modem or something and couple the receiver's audio straight into the "line input" on your sound card. Then there will be no dispute about frequency response.I really need to pick up an inline mike. A friend was telling me it makes a big difference when making these recordings.
Hi Mr Gone, aka Space Varmint,
You recorded your radio with a microphone in front of a speaker?
An Altec Lansing speaker is pretty good and if the microphone is an electret type with the proper bias voltage then it should sound OK.
But your "radio" has too much gain, too much attenuation and its high frequencies are cut too much.
A low-pass filter for audio is supposed to have a flat frequency response up to its cutoff frequency then a sharp drop. Your low-pass filter begins cutting important voice frequencies and has a very droopy response.
You say that your AM section has too much bass and you said before that the power amplifier is boosting the bass when it doesn't.
Do you like the very thin squeaky sounds of a cheap kid's AM radio? It doesn't have any bass.
Man that is pure baloney! Where do you come up with this crap?
Anyway I filtered the audio some more after I finished the pre-selector. It sounds great but I really need to pick up an inline mike. A friend was telling me it makes a big difference when making these recordings.
Now suppose you tell me how the receiver doesn't matter. This should be good...