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by The Rocketeer

Question by Jason W: Why is it that the crystal AM radio I made must be connected to ground but my portable radio does not?
If a radio is not connected to ground, where does the electricity flow from the antenna? There must be another end of the circuit, right?

Best answer:

Answer by -tom m
For small radios there is still enough chassis and metal parts to supply the electrons so that becomes ground for the system, it may not be at actual ground potential but is close enough to allow operation.

Give your answer to this question below!

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Question by Monkey: How long will it take for a radio wave sent from space satellite circulating Mars to reach the Earth?
If the planet Mars is about 56 million kilometers from Earth, how long would it take for a radio wave sent from space satellite circling Mars to reach Earth? Assume that radio waves travel at the speed of light.

Best answer:

Answer by paul1
Distance divided by speed equals time.

Know better? Leave your own answer in the comments!

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Question by Nafee S: How to build a radio transmitter using a 4MHz crystal oscillator?
I am trying to build a radio transmitter for my science fair project. Our design uses a 1MHz crystal oscillator and a 8ohm to 1k ohm transformer on a solderless bread board. But the shops in my area don’t have 1 MHz crystal, they only have 4 MHz. Please tell me of an alternative model which uses 4MHz oscillator. I cannot buy stuff from the internet.

Best answer:

Answer by billrussell42
Use the same circuit you used on the 1 MHz transmitter. If there are any inductors, make them 1/4 the size.

You realize you can’t legally transmit at that frequency?

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Add your own answer in the comments!

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by forklift

Question by : How to setup a radio transmission in a non mountainuos country?
Hi everyone.
What are your ideas for countries who want to setup their radio transmission but they have no mountains. What are the requirement to be met? What are the good instruments which are need to be taken in consideration?
Regards

Best answer:

Answer by Common Sense
You build a tower.

Give your answer to this question below!

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