Troubleshooting

While we hoped it wouldn’t come to this, it’s possible that your SHA2 didn’t work as soon as you applied power. The main thing to remember in a situation like this is . . . don’t panic! It’s usually something simple and since you built the kit, you know the kit and you’ll find it if you look carefully. Just follow a logical approach when troubleshooting.

The first thing to check is always your component placement, especially ICs, diodes, and electrolytic capacitors. Make sure that the resistors with similar color bands haven’t been switched. Then flip the board over and make sure that all the solder connections look good, that none have been missed, and that there are no bridged connections that don’t belong. 90% of the problems we see on kits that have been sent in for repair are construction errors of one kind or another so this really is the place to start.

Check your headphones on a different source to be sure they aren’t the problem. This is also a good thing to do if the SHA2 seems noisy because it’s probably not the kit but may well be a poor connection inside the headphones.

The next step may seem obvious but we’ll state it anyway. Be sure you have a good 9 volt battery or a good power source if you’re using a wall transformer. A multimeter is helpful here. Also be sure that the tip of the adapter is positive, especially if you didn’t get it from Ramsey. A meter isn’t the best way to test a battery but it will tell you if a 9 volt is beyond hope. A battery tester will put the battery or cell under a load and give you a better indication of its condition. If the input power from your regulated supply or wall transformer is good you can check your regulator to see what’s coming in and if you have a good 10 volts going out. (This does not apply if you’re using a 9 volt battery; the kit runs directly from the battery and bypasses the regulator.) If the output of the regulator is good then you can take a look at the schematic and note the power input pins on the ICs, then check them to be sure they’re being supplied with the correct voltages.

Beyond these checks you’ll need some test equipment such as an oscilloscope to follow your line level source through until you see the signal stop. You can read the warranty instructions on the inside back cover of this manual and send the kit in for repair If you get in over your head. All the information for returning a kit to Ramsey for repair is on that page.

If you need help you can call Tech Support at 585-924-4560 and speak with a technician. You can expect to be taken back over the ground covered above when you call, so be prepared. We can tell the people who read through the troubleshooting and checked their kit over from the ones who panicked and called before checking. But rest assured that one way or another you’ll have a working SHA2 when all is said and done.

SHA2 • 21

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.