IR Detector1Sec Output

RRW1 PAIR THEORY OF OPERATION

The RRW1A (transmitter board) may look quite simple but there is actually quite a lot being done inside each one of the parts. Many individual compo- nents are packed inside of the IR receiver part (U2) itself; so many in fact that if it was built up with discrete components, it would never fit in this little kit case. Inside of the part there is an IR detector diode, amplifier, AGC circuit, bandpass filter, a peak-hold circuit, an integrator, comparators, and an output amplifier. Heck, the part is a kit in itself! Just be glad it’s all in one nice module and ready to go.

IR remote controls send out their data on a 38 kHz carrier much like the way your FM radio does. By modulating the carrier signal with the data you want to send, it is possible to increase the range of the transmission and decrease in- terference from other IR sources like ambient light (the sun pumps out lots of IR!!!). The modulation style used with remotes is called OOK (on off keying). In a nut shell, OOK modulation means the IR LED is switched on and off at a rate of 38 kHz in order to send the needed data. The digital data being sent (ones and zeros) is composed of a certain duration pulse for a one and a dif- ferent duration pulse for a zero. There are pauses with no carrier in-between each one and zero data bit being sent for easy determination of the bit boundaries. A common format for this type of data transmission is called 60/30 PWM. While this may sound complex, it really is not. Let’s take a closer look.

PWM stands for Pulse-Width-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Modulation, meaning we

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

change the on-time of the LED

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

within a certain amount of time.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

If we send data at a rate of 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

bit per second (bps), each bit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

would take up a second of

0Sec

 

 

 

 

 

 

 

 

 

 

 

 

 

1Sec 0Sec

sending time. To represent a 1,

 

 

IR Remote

the LED may be switched on

 

 

Output

and off at 38 kHz for 60% of

the one second time frame (0.60 sec.) of it. For a 0, the LED will be switched on and off at 38 kHz for 30% of the time (0.30 sec.) of the entire second.

0

1

RRW1A • 5

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Ramsey Electronics RRW1A manual RRW1 Pair Theory of Operation
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RRW1A specifications

The Ramsey Electronics RRW1A is a versatile radio frequency (RF) wireless microphone system that stands out due to its robust features and reliable performance. Designed primarily for educational institutions, conferences, and public speaking events, the RRW1A offers a user-friendly experience paired with superior audio quality.

One of the main features of the RRW1A is its RF transmission technology, which allows for seamless communication over distances of up to 300 feet. This range is particularly beneficial in larger venues, enabling users to move freely without sacrificing audio clarity. The device operates within a specified frequency band to minimize interference, ensuring a clean audio signal. This digital frequency modulation is complemented by an assortment of selectable channels, allowing users to switch frequencies when faced with potential interference from other devices.

Another significant characteristic of the RRW1A is its dual-channel operation. This feature enables users to connect two different microphones or audio sources simultaneously, making it an ideal choice for panel discussions or multi-person presentations. The system supports both dynamic and condenser microphones, providing flexibility based on user preferences.

The RRW1A also features a built-in rechargeable battery system, offering convenience for users who need a reliable and portable solution. The runtime of the battery extends through long sessions without the anxiety of losing power. Additionally, the device includes LED indicators that show battery life and signal strength, allowing users to monitor the status easily.

Ease of use is a hallmark of the RRW1A, equipped with a simple interface and compact design. The setup process is straightforward, requiring minimal technical knowledge. Users can quickly connect and start broadcasting, making it an accessible tool for educators and event organizers alike.

Moreover, the RRW1A is built with durability in mind. Its rugged construction withstands the rigors of frequent use in various environments. This reliability makes it a preferred choice for both rental services and permanent installations.

In summary, the Ramsey Electronics RRW1A is a powerful and flexible RF wireless microphone solution, featuring RF transmission technology, dual-channel capability, built-in rechargeable batteries, and user-friendly operation, making it an excellent choice for anyone seeking a high-quality audio solution for various applications.
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