So I can receive the two most powerful stations in my area, one being 1KW clear channel, and the other being 5KW at day. But what I find strange is that we have ANOTHER station here that broadcasts at 5.5KW (daytime) yet I can't pick it up on my crystal set. The weirdest part? At night I can pickup (the more powerful) shortwave stations, including one that is QUITE far from me (around 500 miles away via skywave). Alright, well, WSM comes in at night where I live, oftentimes being EXTREMELY powerful, can I pick that station up? No. The whole thing seems weird to me. Is this an antenna problem? A set problem? Or what?
@qwertykeyboard5901 Not really an antenna problem. I have 2 antennas, 1 is east west the other north south. Some people have 2 more running NE to SW and NW to SE.
I looked into the SDR. Yes, it will show me the spectrum of radio waves coming in, but it won't go low enough in frequency (25 Hz to 25kHz) to show the audio coming out. It's the second thing that viewers need to see. I do have a Nano VNA and they say it can be used as an audio spectrum analyzer **IF** it is used carefully. I have to look more into that. UPDATE: My Nano VNA goes down to a few hundred kilohertz, way too high for audio. Back to square 1.
Use the lighting port as audio input, if you have a newer iPhone. I would try a direct unamplified crystal radio output directly into the phone I think the phone's input would be well buffered. But to be on the safe side, maybe at first put a potenitiomter between the crystal radio and phone and set to high impedance-- for all I know, you have a 600 foot long antenna out your back window!@@tsbrownie
Thank you for all you do for us. Question: Is the term "selectivity" the same term for "Q Factor," as in audio bandpass filters? Maybe make a recording of royalty free music, from the net - or, create a simple tune, with free net tools, maybe Audacity. Build a simple low range bench AM transmitter. I see those DIY projects on YT. Maybe all said easier than done, or gives poor results, but I am trying to be helpful. Cheers.
Thank you. Q factor is defined as the ratio of the energy stored in the oscillator to the energy that must be imparted per cycle to keep the oscillator oscillating. I usually say it's the efficiency. Q stands for quality. I bought an AM transmitter to do what you said, but it's power was too low. I'm still working at that.
IP is complex. With music on the radio, there are multiple parts. If **I** played the classical recording and transmitted it, I could use it. Since the music is public domain, BUT the particular recording belongs to the person playing it. So if you record something by Mozart, I have to pay you to use your version. You can't claim ownership of the song, just your performance of the song. And I think that the people transmitting may be able to claim ownership of the transmission as they are "adding value" by sending it. (I don't think our British friends have that problem because their radio is owned by the government, with paid government performers, and it's a public good).
That's how most tuners work. You create resonance in the coil between the antenna and the ground (which would be a short in a DC circuit, but not with an antenna/coil AC resonance). The rest of the coil is "vibrating" at its preferred frequency that it gets (like an auto-transformer) from the other side of the coil.
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So I can receive the two most powerful stations in my area, one being 1KW clear channel, and the other being 5KW at day.
But what I find strange is that we have ANOTHER station here that broadcasts at 5.5KW (daytime) yet I can't pick it up on my crystal set.
The weirdest part? At night I can pickup (the more powerful) shortwave stations, including one that is QUITE far from me (around 500 miles away via skywave).
Alright, well, WSM comes in at night where I live, oftentimes being EXTREMELY powerful, can I pick that station up?
No.
The whole thing seems weird to me. Is this an antenna problem? A set problem? Or what?
@qwertykeyboard5901 Not really an antenna problem. I have 2 antennas, 1 is east west the other north south. Some people have 2 more running NE to SW and NW to SE.
@@tsbrownie So should I try making the antenna face a different direction?
@@qwertykeyboard5901 It's easier to run a second antenna and switch back and forth to see which works better for a given station.
@@tsbrownie Thanks!
You can get a spectrum analyzer for about 34 dollars. Its called Software Defined Radio. The spectrum will show on your PC.
I definitely need to look at that. I'd heard about it, but never thought to apply it here. Thanks!
I looked into the SDR. Yes, it will show me the spectrum of radio waves coming in, but it won't go low enough in frequency (25 Hz to 25kHz) to show the audio coming out. It's the second thing that viewers need to see. I do have a Nano VNA and they say it can be used as an audio spectrum analyzer **IF** it is used carefully. I have to look more into that.
UPDATE: My Nano VNA goes down to a few hundred kilohertz, way too high for audio. Back to square 1.
@@tsbrownie gee, I have multiple audio spectrum apps installed for free on my iPhone and they work great.
@@franzliszt3195But they take an audio input, and if I play the audio, my video gets taken down.
Use the lighting port as audio input, if you have a newer iPhone. I would try a direct unamplified crystal radio output directly into the phone I think the phone's input would be well buffered. But to be on the safe side, maybe at first put a potenitiomter between the crystal radio and phone and set to high impedance-- for all I know, you have a 600 foot long antenna out your back window!@@tsbrownie
Thank you for all you do for us. Question: Is the term "selectivity" the same term for "Q Factor," as in audio bandpass filters? Maybe make a recording of royalty free music, from the net - or, create a simple tune, with free net tools, maybe Audacity. Build a simple low range bench AM transmitter. I see those DIY projects on YT. Maybe all said easier than done, or gives poor results, but I am trying to be helpful. Cheers.
Thank you. Q factor is defined as the ratio of the energy stored in the oscillator to the energy that must be imparted per cycle to keep the oscillator oscillating. I usually say it's the efficiency. Q stands for quality. I bought an AM transmitter to do what you said, but it's power was too low. I'm still working at that.
Thanks again for sharing your experiences.
My pleasure!
Can't you play classical music? The composers all died a couple hundred years ago?
IP is complex. With music on the radio, there are multiple parts. If **I** played the classical recording and transmitted it, I could use it. Since the music is public domain, BUT the particular recording belongs to the person playing it. So if you record something by Mozart, I have to pay you to use your version. You can't claim ownership of the song, just your performance of the song. And I think that the people transmitting may be able to claim ownership of the transmission as they are "adding value" by sending it. (I don't think our British friends have that problem because their radio is owned by the government, with paid government performers, and it's a public good).
How can this work? The wiper is shorting from that position on the coil, across the resistor and to the negative terminal of the IN34?
That's how most tuners work. You create resonance in the coil between the antenna and the ground (which would be a short in a DC circuit, but not with an antenna/coil AC resonance). The rest of the coil is "vibrating" at its preferred frequency that it gets (like an auto-transformer) from the other side of the coil.