Setup and Testing

It’s time to apply power to your SHA2 and start listening to your line level sources.

You need:

•An AC adapter or a fresh 9 volt battery

•A line level audio source (CD player line out, etc.)

•A cable to connect the audio source to the SHA2. Either dual RCA to 3.5mm stereo or 3.5mm stereo to 3.5mm stereo, depending on what connector(s) are on your line level source.

•Headphones

1.Connect your audio source to J1, the line level audio input jack.

2.Connect your headphones to either J3 or J4, the headphone outputs.

3.Connect your DC supply or 9 volt battery.

4.Turn on your line level source.

5.Turn on your SHA2. The LED, D3, should light and then go out after a few seconds. Turn the volume up to a comfortable level.

6.You should be hearing your line level audio source at this point. Now try the balance control, R12, and get the balance between left and right set where you want it.

7.Try out the treble control, R10, and the bass control, R11, and set them for the sound you want.

8.Next try pressing in S1, the loudness control. You should hear the difference immediately. It almost sounds like a bass boost but you’ll notice that the overall loudness increases too.

9.Plug another set of headphones into the other headphone jack and try that out too.

When you first see your LED light you may think that it’s a power on indicator, and it is temporarily when you first turn on the kit. After that it’s a clipping indicator, showing you when the audio level is close to the maximum output of the IC. During typical operation this LED will be off.

The buffered loop output, J2, allows you to connect the line level audio output of your SHA2 to another device. You can set the SHA2 up so that the output is directly coupled, just as if you had your line level source connected right to the other device, or you can send the line level audio to another source with the tone controls added. This is done using jumper headers H1 and H2.

SHA2 • 19

SHA2 specifications

Ramsey Electronics SHA2 is a state-of-the-art digital transmitter designed for a wide range of applications, including DIY projects, short-range communication, and remote sensing. This powerful device allows users to transmit audio, data, and control signals wirelessly with outstanding clarity and reliability.

One of the standout features of the SHA2 is its transmission range, which can reach up to several hundred meters depending on the environment and conditions. This capability makes it an ideal choice for various applications, from hobbyist projects to more complex commercial uses. The SHA2 operates in the 2.4 GHz ISM band, which is a widely used frequency range that provides robust performance and minimal interference from other electronic devices.

The SHA2 incorporates advanced Frequency Hopping Spread Spectrum (FHSS) technology, enhancing its resilience against potential disruptions. By rapidly changing frequencies during transmission, FHSS minimizes the chance of interference and improves the overall signal integrity, ensuring a stable connection even in crowded environments. This feature is particularly beneficial for applications that require reliable and consistent data transmission.

Moreover, the SHA2 is equipped with powerful modulation schemes that support various encoding methods. As a result, users can transmit different types of signals, including analog audio, digital data, and even coded control signals. This versatility allows for creative approaches to problem-solving in diverse fields, such as automation, security systems, and wireless audio transmission.

In terms of user-friendly design, Ramsey Electronics has made the SHA2 easy to integrate into existing systems. Its compact size, along with clearly marked connection points, allows for streamlined installation. The module's low power consumption is another critical advantage, making it suitable for battery-operated devices and applications that prioritize energy efficiency.

The SHA2 is also compatible with various microcontrollers and development platforms, ensuring seamless connectivity regardless of the user's preferred technology. With its durable construction and excellent performance specifications, the Ramsey Electronics SHA2 stands out as a reliable choice for anyone looking to leverage wireless communication technology effectively. In summary, the SHA2 excels in transmission range, interference resistance, versatile signal encoding, user-friendly integration, and energy efficiency, making it a prime candidate for both hobbyists and professionals alike.