ASSEMBLY OF THE RRW1A

Assembly of the RRW1A is straight forward but it does require some time and patience. To get our bearings, we will start by mounting the power jack and move on from there. It serves as a good reference point for the other parts.

‰1. Install J1, the 2.1 mm power jack. Be sure to get a solid connection to all three pads as this will have to take some mechanical strain during normal use. Use ample solder (without ‘globbing’ it on of course).

‰2. Install R6, the 270 ohm resistor (red-violet-brown).

‰3. Install C7, the 2.2 pF ceramic capacitor (marked 2.2). C7 acts as the feedback path for our “Colpitts” style oscillator. This capacitor combined with the next one (C8) and the saw resonator (X1) make this circuit oscillate at the required frequency. Note that this is one of the rare exceptions to installing at 90 degree angles. This part is actually installed at a 45 degree angle to keep lead lengths as sort as possible. This goes to show how important it is to keep your lead lengths short! Even a small amount of trace can introduce inductance that may prevent our oscillator from working properly.

‰4. Install C8, the 8.2 pF ceramic capacitor (marked 8.2).

‰5. Install C3, a 0.001 uF ceramic capacitor (marked .001 or 102 or 1 nF).

‰6. Install L1, a 33 nH 4-turn inductor. Be careful not to distort or crush this when installing it.

‰7. Install Q1, one of the 2SC2498 transistors (marked C2498 or C2570). Pay close attention to the Parts Layout Diagram and the silkscreen on the circuit board for proper orientation (the flat side is a good indicator). Right next to Q1 is Q2 (another 2SC2498 transistor) so make certain to use the correct mounting holes.

‰8. Install Q2, another 2SC2498 transistor (marked C2498 or C2570). Again note the orientation of the flat side before soldering.

Transistor Q2 provides the amplification needed to keep the 433.42 MHz RF oscillator going. Q1 and its surrounding parts form a special buffer stage which isolates the antenna from the oscillator. If it wasn’t for this buffer stage, the oscillator could stop working whenever things like your fingers or a metal object are nearby. This pair working together forms a very stable oscillator which resists a lot of external changes to maintain performance!

‰9. Install X1, the saw resonator (TO-39 metal case). This is the component that determines the operating frequency of the oscillator by interacting with the feedback capacitors surrounding Q2. Note the silkscreen on the circuit board for proper orientation.

RRW1A • 10

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Ramsey Electronics manual Assembly of the RRW1A
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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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