2PCS FM receiver wireless audio frequency transmitting FM FM transmitter FM MIC V3.2 core board
Note:
The baby delivery is in the picture above kind， core board does not include power leads and antennas， free play ( solder the battery or after customers buy the transmitting antenna ， the figure + represents battery cathode ， - on behalf of the battery negative ， ANT representative antenna lead terminals ， usually with some 70 cm antenna wire can be! )
Baby features:
Baby microphone around the onboard sound is converted into FM radio signals emitted realize acoustic pickup and wireless FM transmitter ， baby transmit frequency is adjustable， core board green element is adjustable capacitor ， changing tunable capacitors can be changed transmitting frequency ， adjustable coverage 88-108MHZ GB FM segment. You can use the phone as a radio and receiver ! Baby widely used in the transmission of voice pickup ， audio MIC， the elderly and children， and so need to sleep listening sound pickup occasion !
Baby Features :
Has an unparalleled wide operating voltage range from 0.7V to 9V! ! Understand electronics are turned understand a PN junction voltage is 0.7V! That is， any one cell can make the baby a good job ( single batteries， lithium batteries， button batteries， carbon deposits batteries， solar batteries， lead-acid batteries ， a variety of common batteries! )
Signal pure， spurious emission suppression reached -60dBc! About 96.5MHZ very clean image above to see inside 50MHZ bandwidth ， the actual signal conditions in the following figure (test with the most professional 3.6GHz RF spectrum analyzer)
has a very low power consumption ， 0.7V operating current is only 0.9mA， using a single 1.5V power supply on the 5th battery current is only 4.2mA， if you use the capacity of the 5th 3000mAH NiMH rechargeable battery， can work continuously for 3000 / 4.2 = 29.76 days ! ! ! Wow ， a month !
Frequency is adjustable， adjust coverage 88-108MHz， actually much wider than this frequency by adjusting the variable capacitor with no sense of a screwdriver .
Parameters:
Working voltage: 0.7V to 9V wide
Frequency adjustment range : wider than 88-108MHZ
Transmission Distance: 9V work when using a 70 cm antenna conductors do ， open the local firing distance of 50-100 meters ， the actual look at the environment
Relations operating voltage ( V ) and supply current ( mA ) and transmit power (dBm) is as follows :
9V， 24mA， 10.2dBm ( ie 11 mW )
8V， 21mA， 9.5dBm
7V， 19mA， 8.5dBm
6V， 17mA， 7.1dBm
5V， 14mA， 6.1dBm ( about 5 milliwatts)
4V， 12mA， 4.5dBm
3V， 9mA， 2.2dBm
2V， 6mA， -1dBm ( about 1 milliwatt )
1.5V， 4.2mA， -4dBm ( about 0.5 mW ， the average family environment emit sufficient， small green radiation ! )
1V， 2.4mA， -9dBm
0.7V， 0.9mA， -20dBm ( i.e. 0.01 mW )
