How to test r/c transmitter for 27 & 49mhz using am or fm radio s
Which radio station -am or fm & which station or frequency one can use to see if transmitter is sending signal? It should make a high pitch noise over am fm radio station when toggle swithces are moved.
Re: How to test r/c transmitter for 27 & 49mhz using am...
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The receiver is not binding to the transmitter. Make sure the batteries are in good shape in transmitter. I'm assuming it's a 2.4GHz radio frequency. When you are about to fly, turn transmitter on first after 4-5 seconds turn heli on or plug battery in on heli. In the manual there should be a page describing radio binding. It will describe on what gimbles to move and in certain sequences to complete the process. When the light on transmitter stops flashing means the binding process is complete. Hope this helps.
Hi - (I have built this kit)Is the audio totally dead? My volume control was not very good - I ended up replacing it. Can you try an ear-piece connected directly to the in put of the audio amp (center pin of volume control). May need a crystal earpeice
Hi Somewhere on the transmitter is the transmitted frequency. If a hobby grade unit the frequency will start with 72.xxx mhz. If this is a toy store unit the frequency will start will 27.xxxmhz. Each of these bands will be subdivided into channels. At any rate, the receiver must match the frequency on the transmitter.
Each microphone has a different FM Freq. If you can not find a Freq there is a very small hole in the mic near the Mic switch. You will need a jewlers screwdriver to make a freq. adjustment. Hold down the applause button while very close to your FM radio. Use manual tuning on your FM radio until you hear applause. If there is a local station playing on the Freq you can insert the jewelers screwdriver into the small hole and change the FM Freq for the Mic. You only need to make "fractional adjustments" to change the Freq. setting. Once you make a mic freq. adjustment change the radio freq SLIGHTLY up and down until you hear the applause.
This should get anyone going that is having difficulty with this microphone.
FM 99.7 works best.... However if you have a local FM station using that freq your out of luck UNLESS your handy with a Jewelers screwdriver. Calling tech support will get you a "sorry" but there is nothing we can do. So if you are one of the unlucky ones with a Local 99.7 FM station here is what you can do.
1) Find a dead spot on the FM radio band either at the very low end or high end of the range. You should hear just fuzz (white noise) on your radio. However, on many newer FM tuners if there is no station broadcast there is nothing but silence.
2) Put batteries in the microphone.
3) Get a really really tiny flat head (Jewelers)screwdriver just like the kind in those eye glass kits they sell at the grocery store.
4) Sit right in front of the radio
5) Insert the screwdriver into the tiny hole in the microphone and tune the microphone until the radio goes quiet (no fuzz sound). Or.... you can keep pressing S to hear a beat and the beat is acutally heard through the speakers.
The hole is located just to the left of the screw that you undid to get at the battery compartment, but it's off center. Inside this hole is a small tuning screw. Slowly, slowly, SLOWLY turn the screw driver until you here a change or interruption in the fuzz sound on the radio speakers. This will indicate you found a compatible frequency. Then even slower - tune back to that "notch" until you hear nothing but silence on the radio. Test it by pressing the applause button "A" or by pressing the mic "M" button and talking.
There are multiple places on the FM dial that will "work" as you tune the little screw but you should have already manually selected where (the FM freq) you want to use your mic.
Once it's working it ain't perfect. I doubt you'd do a serious performance on it, but the kids love it.
The mic quality is not top notch for sure.
Unfortunately you can't. You will need to change the receiver or the transmitter so they are both the same frequency range eg 40mhz or 27mhz. Then you will need to check the crystal is the same frequency for the Transmitter and receiver eg 40.25mhz. NB. you can't put a 27mhz crystal into a 40mhz set or vise versa it won't work.
you need to have it on and tap it while you turn the tuning knob on the radio until you come accros the station that will pick it up, this may take a while and most times it's on both the AM and FM bands so try both.
The radio needs to be set to a specific station (its listed on the packaging) What the microphone essentially does is override the broadcast on that frequency and allows you to hear yourself. Its the same principal as the '80's classic "Mr. Microphone".