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4 votes
Accepted

Effect of using wrong injected frequency when tuning IF cans in an AM radio?

A fun question to mull over. What does it mean for a receiver to be "on frequency"? First there's the tuning dial and its indicator. This usually drives both the capacitor that resonates ...
tomnexus's user avatar
  • 11.5k
3 votes
Accepted

Natural dipole / monopole filtering

Word has it these antennas are broadband, As far as I can tell, that word would be wrong: Broadband antennas work "well" for a contiguous band larger than 1/5 of its center frequency. (This ...
Marcus Müller's user avatar
2 votes

Need some help to design a DIY MW Radio receiver

Circuit #1 AM Radio Receiver Circuit ...is a regenerative-type receiver. It could be adapted to use a "loopstick" (ferrite rod). Regenerative receivers can be made very sensitive, but are ...
glen_geek's user avatar
  • 1,026
2 votes
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How to test a simple homebrew CW transmitter - can I use an AM radio?

Tune your transmitter to a frequency that's within a few hundred hertz of a local AM broadcast transmitter. When you key your transmitter, it will "beat" with the broadcast carrier and you ...
Dave Tweed N3AOA's user avatar
1 vote

How to test a simple homebrew CW transmitter - can I use an AM radio?

If you have the resources to build a CW transmitter, you can probably also manage to build a simple regenerative receiver. These receivers are unique because the self-same receiver can "hear&...
Zeiss Ikon's user avatar
  • 4,147
1 vote

How to test a simple homebrew CW transmitter - can I use an AM radio?

Regarding your car radio: You probably can. You're right, in the stable case, you wouldn't hear anything (There's no DC your receiver would be putting out: in broadcast AM, the signal modulated onto ...
Marcus Müller's user avatar
1 vote

Can I operate in AM mode using an Alpha 78 amplifier?

The device calls itself a "HF linear amplifier". That "linear" means it's designed to amplify signals whose amplitude change, proportionally. That's exactly what AM is. The manual, ...
Marcus Müller's user avatar

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