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Is it possible to change the frequency range of an Azden 500UDR receiver and a 41BT transmitter to comply with new FCC regulations?

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According to the FCC website on wirelss mics no.

http://www.fcc.gov/cgb/wirelessmicrophones/manufacturers.html#Azden

Posted on Sep 25, 2010

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Display unit works on a 868.3MHz transmitter. Is it possible to convert the unit to receive info from a 433.9MHZ transmitter? Possibly altering the aerial length inside the display unit?


Not possible. The electronics are tuned to that frequency. The length of the antenna has no effect on changing the frequency of the receiver because it is tuned too.

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I have a Motorola Axu4100 , I want to change the frequence that I currently have on this radio to a Motorola CP-200...just wondeing if these two radio can work together....


Hi
Motorola CP-200 have frequency range 
VHF: 136–162, 146–174MHz;
UHF: 403–440, 438–470, 465–495MHz depending on the model
Motorola AXU4100 have frequency range 435 - 480 Mhz
The first model has a wider frequency range so it is best to include transmitter Motorola Axu4100 to transfer and try to receive signal to Motorola CP-200

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1 Answer

Short static burst


I don't know a whole lot about microphones, but if it's wireless, then it has to accept interference according to the FCC. Wireless microphones normally connect using RF transmitters/receivers which can normally be tuned to specific short-range broadcast frequencies, which can be interfered with by passing waves of other frequencies. Even if the broadcasted radio waves aren't the same frequency, or within the same bandwidth, the harmonic distortion radiates at multiples of the fundamental (broadcasted) frequency.
If you can, try changing channels and see if that clears things up. If not, then perhaps contacting the manufacture can help.

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How to make Shure wireless mic work with Azden 305


Sorry, that is not possible. Different manufacturers use different companding, noise reduction, and squelch schemes. Thus, even if they are on the same frequency, you might not get any audio or the audio might sound quite funny.

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1 Answer

Old motorala sp50 frequency


All radio frequencies in the US are subject to FCC regulations. There are 5 MURS frequencies which are license-free in the VHF band. To check your radio's frequency you would need to have it read out by an authorized Motorola dealer. The SP50 radio is a programmable model and it could be programmed to any frequency within its range.

Best regards.

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Our identical twins got identical Vengeance radio controlled cars from Blue Hat Toy Company. The problem, they're on the same frequency and there are no more in town to trade one out. Can the frequency...


Because of regulations set by the authority in your (any) country which controls the radio spectrum usage, toys in particular are only allowed to operate on certain frequency bands and the transmitter must be controlled by signal sources (oscillators) that are 'crystal' controlled (quartz). These maintain a very stable signal at a specific frequency just like a 'quartz watch.' The receivers need not be that stable so the controlled toy has a simpler circuit that can be tuned but this isn't useful in your case since that would only result in reducing the sensitivity (range) unless the transmitter crystal was changed.
I'm sure the manufacturer has anticipated the possibility that two or more of these toys might be operated in close proximity and probably has multiple models with different crystals available but unless you can contact them, this won't do you much good as you would likely have to return the toy to have it changed.

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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.

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Channel A is FRS channel 8, at 467.5625MHz.
Channel B is FRS channel 13, at 467.6875MHz.

If you ever have another question like this one, search by FCC ID # at http://www.fcc.gov/oet/ea/fccid/Welcome.html .

Regards!

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