How to build a radio transmitter using a 4MHz crystal oscillator?
Q. 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.
Asked by Nafee S - Mon Oct 27 11:39:42 2008 - - 1 Answers - 0 Comments

A. 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? .
Answered by billrussell42 - Mon Oct 27 12:39:00 2008

How to change the frequency of a radio transmitter?
Q. My radio doesn't receive a signal from my radio transmitter, because it transmits at 900 MHZ; which is too high for a radio to receive. I know i can just buy one, but this one has 300 ft range, and i like modifying things myself. SO, please help me. and make it simple. Websites with tutorials are appreciated.
Asked by dead sea - Tue Dec 8 22:53:40 2009 - - 2 Answers - 0 Comments

A. What are you trying to do? Control an R/C car, boat or airplane? What is this transmitter? 900 MHz sounds like a public service two-way radio. However, these radios have more than a 300 ft range. A 300 ft range would sound like a R/C transmitter but there aren't any that work at 900 MHz. I will assume you are are trying to control an R/C thing-a-ma-jig. R/C receivers work at 27 MHz, 72 MHz, 75 MHz or 2.4 GHz. If your R/C transmitter works in the same band as your receiver, you can change crystals in both the receiver and/or transmitter, fairly easy. If you like modifying radio gear, get an Amateur Radio (Ham) License. You are allowed to build, experiment with and modify all the radio gear you want! Hams also use their gear for R/C.
Answered by Socrates - Wed Dec 9 14:10:00 2009

How do you connect a sensor to a radio transmitter and programming it to transmit one task only?
Q. I badly need advice on how to do this for our science project. Our project is to monitor garbage through radio waves and sensors... the problem is that how do we connect the sensor to the transmitter and how do we get to program it to transmit the garbage levels... and one more thing... What Type of sensor do we use?
Asked by Poke_girl_Trisha - Thu Jul 9 07:37:07 2009 - - 1 Answers - 0 Comments

A. Sounds like a cool project that's best if broken down by section. The key to a successful science project is to keep it as simple as possible while demonstrating one or more concepts. Cost will also be a concern. The trickiest part will be your radio link since there are all kinds of government regulations about what you can and cannot do especially at the unlicensed level. Instead you want to find a transmitter and receiver that already work well together over short distances. Garage door or car alarm remotes can be difficult to work with on the receiver end. A pair of cell phones might work if you have unlimited minutes to burn. Low power toy walkie talkies might work if you had a way to push the transmit button for short intervals. An… [cont.]
Answered by DON - Thu Jul 9 10:51:15 2009

Why class of bias used is an important factor in radio transmitter?
Q. Guys any one who's in da tecommunication field pls help me with these questions 1)Why class of bias used is an important factor in radio transmitter? 2) Justify the use of class c bias for mobile transmitters 3) Functions of a final stage power amplifier in a radio transmitter Thx in advance
Asked by EYmax4 - Sat Nov 7 04:37:43 2009 - - 1 Answers - 0 Comments

A. 1) osscilator 2)antenna 3) it amplifies the converted RF frequencies
Answered by 5 star - Sat Nov 7 04:41:18 2009

why does a cassini probe need a dish for its radio transmitter and reciever?
Q. why does a cassini probe need a dish for its radio transmitter and reciever? this is my science hoomework and i dont get it help?!
Asked by Amy - Wed Oct 14 15:08:54 2009 - - 1 Answers - 0 Comments

A. I'm pretty sure they are combined on Cassini (from memory). There is not a lot of room in Cassini for radio equipment so the single is weak being transmitted and the antenna is needed to amplify the signal from Earth. Mike Honeycutt
Answered by mahoneycuttnc2002 - Sat Oct 17 21:21:28 2009

what is a great radio transmitter that is compatible with the apple iPhone?
Q. im sick of radio stations playing the same songs over and over...i have an iphone with tons of music on it and want to be able to use it in the car, but am not sure which one to get. what are some good iphone radio transmitters that i should take a look at?
Asked by senior beisbol - Tue Oct 6 22:35:13 2009 - - 1 Answers - 0 Comments

A. the Monster iCar Play wireless. An alternative option is buying a special tape (if your car has a tape deck) attached to this tape is an auxillary cord which plugs into your iphone's headphone jack, from there you can play your music via "tape" mode in your car. Note the tape method does drain your battery though, whereas the Monster iCar play wireless charges it for you.
Answered by Aman J - Tue Oct 6 22:41:02 2009

I bought a 30gb video Ipod, where can I get a good car radio transmitter?
Q. I bought a 30gb video Ipod, where can I get a good car radio transmitter? I want to listen to my Ipod in my car but i don't have an AUX plug. Do you know a good brand?
Asked by b mack - Wed Jan 3 17:07:35 2007 - - 3 Answers - 0 Comments

A. go to radio shack they have a wide assortment of FM transmitters for MP3 players anywhere from $ 30 on up !
Answered by bbq - Wed Jan 3 17:09:58 2007

Can a FM Radio Transmitter FM10C be hooked up to a computer?
Q. I want to be able to listen to the songs on my computer through out my house but i don't want to spend to much on a transmitter and FM Radio Transmitter FM10C is the right price if i can hook it up to my Computer. Thanks Nick
Asked by Nick - Wed Dec 23 23:28:58 2009 - - 1 Answers - 0 Comments

A. You sure can Nick, good choice. If your computer has a "Line Out" jack on the sound card, this would be the best place to conect to the transmitter's input. If not, you can still connect to the Speaker Out jack, just make sure you keep the volume low to prevent overdriving the transmitter and distorting the signal. You will need a cable with a mini-stereo plug (that fits in your soundcard jacks) on one end and dual-RCA plugs (one for Right Channel In, one for Left Channel In) to plug into the transmitter. If you can build the kit, making the cable yourself will be easy. Once the transmitter kit is built and adjusted, you just find a spot on you local FM dial where there is no signal, and tune the transmitter to that frequency. Presto,… [cont.]
Answered by Gunner0812 - Thu Dec 24 01:20:01 2009

what can i use besides a radio transmitter to play my ipod in the car?
Q. i had a radio transmitter belkin to play my ipod in the car but it sucked. it was always sounding static...is there anything else that i can use to play my ipod in the car? i have a cd player not tape player so i cant but the tape that can connect to it...
Asked by Yajaira - Thu Jun 25 17:28:23 2009 - - 2 Answers - 0 Comments
how to make a AM radio transmitter have more power?
Q. First off dont worry about fcc legal issues i live way out side city limits. and there are hardly any radio stations here. I bought a AM1C ramsey transmitter kit and i want to know how to make it more powerful. i have lots of spare transformers and caps along with other stuff so can you help me out.
Asked by Takeo T - Tue Sep 1 18:26:25 2009 - - 1 Answers - 0 Comments
What would a buried radio transmitter sound like?
Q. I'm writing a story that involves searching for a missing spaceship. The ship in question got buried in river silt during a seasonal flood. However, it's intact, everything is in working order, and it has some power, enough that its emergency radio beacon is operating. What would that sound like to a searching craft with a radio receiver? Would the content of the message be intact, somewhat garbled, or just static? How about directionality... would searchers have a harder time triangulating the location? How much would the power of the transmission be diminished? Thanks in advance!
Asked by HawaiianHippie - Wed Jul 29 05:31:21 2009 - - 3 Answers - 0 Comments

A. Radio waves travel through water and can reach some depth into land too. If the radio signal is operating and is transmitting radio waves, the waves aren't gonna get influenced by the surroundings. They might get weakened due to being worried in the ground and under water but the actual message won't change. The weak wave might be harder to pick up resulting in static and such. But the message (or the sound or whatever the message holds) won't change.
Answered by afthefragile - Wed Jul 29 05:49:47 2009

Is it possible to feel nausea one day after getting radiation from a radio tv transmitter?
Q. Yesterday, I was 300 metre close to a radio tv transmitter and I didn't feel anything unusual. Today, I had lots of work to do. I got very tired, and now I feel nausea. Do you think it is because I got radiation yesterday? or it is not related with it as I didn't feel anything unusual yesterday?
Asked by Men T - Wed Mar 3 16:10:21 2010 - - 3 Answers - 0 Comments

A. Yes it's possible. I suspect you really mean to ask, is it possible that being 300 meters from a TV transmitter will cause me to be nauseous one day later. Yes it's possible, but not likely. Even high powered surface radars, which are way more powerful than TV transmitters, will not cause harm to anyone 300 meters away.
Answered by oldprof - Wed Mar 3 16:34:54 2010

Is being in a 300 metre distance from a radio tv transmitter for 30 minutes dangerous?
Q. I was 300 metre away from some radio tv transmitters yesterday. I stayed there for 30 minutes and then left that place. (I realized that there were thoset transmitters after then) Do you think I did a very dangerous thing by being there?
Asked by Men T - Mon Mar 1 16:58:26 2010 - - 2 Answers - 0 Comments

A. Not likely dangerous. But there is no real way to tell as the answer depends on the transmission energy and that you failed to share. In any case, as the energy flux diminishes by the inverse of the square of the distance (1/R^2), whatever you received at 300 m is not likely to be dangerous. Even the most powerful RADAR transmitters, way more powerful than TV transmitters, are not dangerous at those distances.
Answered by oldprof - Mon Mar 1 17:06:16 2010

How can I make a simple radio transmitter using amplitude modulation?
Q. I am only trying to understand how it works so make it simple and describe why you say what you say.
Asked by amo71993 - Fri Jun 6 13:52:57 2008 - - 2 Answers - 0 Comments

A. Dr: that's a receiver, not a transmitter. has a circuit is another. Search google for "amplitude modulation schematic" and you will find hundreds. FCC has severe limits on how much power you can broadcast. Don't remember, perhaps 1/2 watt?
Answered by billrussell42 - Fri Jun 6 14:17:07 2008

how to create a radio frequency transmitter?
Q. For my science experiment i need a radio-wave frequency generator/transmitter. I was hoping someone could give me some tips on how to create one. preferably a powerful generator with a wide range of frequencies and if possible a way to control which frequency. But anything would be great. If you can, could you please tell me where you learned this.
Asked by me, myself and I - Mon Oct 8 23:05:02 2007 - - 4 Answers - 0 Comments

A. If you have a science experiment to build but no knowledge of how to make a radio-transmitter for it, I would suggest you buy one. Not only will that save you enormous amounts of headaches but it will also let you get back to your science experiment faster. There are enormous differences in techniques to build transmitters depending on power, frequency range, linearity requirements, pulse/continuous operation requirements, load impedance etc.. I could give you a few ideas if you specify what it is that you are trying to do (not just the frequency and the power, please). But if it happens to be in a non-trivial phase-space of the power rf world, you will curse the day you ever thought of building something yourself before you ever get… [cont.]
Answered by amansscientiae - Tue Oct 9 00:30:28 2007

I'm building an AM radio transmitter, How do I tune the receiver to 1000kHz?
Q. My crystal oscillator is at 1MHz, and I need to tune my AM receiver to 1 MHz (1000kHz). All the radios I've seen only have channels, like 98.5 or something, so for this case, what would I have to tune my receiver to? Sorry, I am a confused newbie at this subject. Thanks in advance!
Asked by Some Person - Thu Oct 22 19:18:27 2009 - - 3 Answers - 0 Comments

A. The AM broadcast band ranges from 530 1610 kHz. Tune to 100.
Answered by Keith - Thu Oct 22 19:56:42 2009

A 1-kW radio transmitter operates at a frequency of 880 kHz. How many photons per second does it emit?
Q. I don't even know how to get started with this. If you solve this, please show some steps so I can use it for future reference.
Asked by You - Sun Mar 1 16:03:52 2009 - - 1 Answers - 0 Comments

A. The energy of a photon is E = hf where h is Planck's constant and f is the frequency. In your case, E = ( 6.64 x 10^-34 J-s ) ( 880,000 ) = 5.3 x 10^-28 J. A 1-kW transmitter consumes power at the rate of 1000 J / s. So the number of photons required is ( 1000 J / s ) / ( 5.3 x 10^-28 J / photon ) = 1.88 x 10^30 photons / sec
Answered by jgoulden - Sun Mar 1 16:10:02 2009

What component of a radio transmitter determines the frequency of its radio signals?
Q. What component of a radio transmitter determines the frequency of its radio signals?
Asked by GuitarFr3ak - Fri Aug 28 12:57:35 2009 - - 3 Answers - 0 Comments
How much would a decent FM radio transmitter cost?
Q. One that could broadcast a personal station around my town.
Asked by That Other Guy - Wed Sep 13 16:26:50 2006 - - 3 Answers - 0 Comments

A. Im not sure if this link still works, but try
Answered by The Oldest Man In The World - Wed Sep 13 17:48:12 2006

How do I solve how many photons per second a radio transmitter emits if I know its wattage and frequency?
Q. How do I solve how many photons per second a radio transmitter emits if I know its wattage and frequency?
Asked by Mike M - Wed Sep 12 04:33:10 2007 - - 1 Answers - 1 Comments

A. Power = energy per unit time = (energy per photon) * (photon per unit time) = (h*f) * (photons per unit time) Therefore, (photons per unit time) = Power/(h*f) where: Power = wattage h = Planck's constant f = frequency.
Answered by nealjking - Wed Sep 12 04:48:16 2007

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