The term QRSS refers to the Q-code CW mode, where the receiver’s bandwidth is reduced so that the information is received at a slower rate. The purpose behind sending the data slowly is so that it can be interpreted by the receiver efficiently. In this mode, the receiver’s bandwidth is reduced so that it can be easily read by the ear. Commonly, the bandwidth of less than 1 Hz is used in QRSS as the received noise depends on the receiver’s bandwidth such as in shortwave radio. The QRP operations are done using this method because the weak signals are received and interpreted for high background noises.
Using the QRSS method, the morse code dot of any length can be transmitted to anywhere in just a few minutes. However, although the data is transferred in weak signals, the amount of data that can be transferred is compromised. The frequency stability is critical at the receiver and the transmitted ends because of the narrow bandwidth used. To deal with these issues, it is recommended to use the crystal-controlled reference using the crystal over to maintain a constant temperature.
With all these complications, it is obvious that the transmission of signals requires patience. It is practically impossible for the operators to monitor the transmission of signals on the computers while sitting at the terminals. However, both the advancements brought in the software and hardware have led toward bringing some ease in transmission. The receiving QRSS and transmitting QRSS has led to the management explained next in the article will indicate how the whole process is made easy to manage for the operators.
The receiving QRSS works with efficient hardware and software equipment to properly operate and process the signals. Different software packages such as Argo, Spectran, and Spectrum Lab display different characteristics of the signals. The main function of this software for receiving QRSS includes displaying the signals over a 100 Hz user definable window. The receiving terminal should have good frequency stability so that the signals are received and interpreted properly. The transmitting QRSS is simpler and is low-power equipment. A simple homebrew transmitter is used for its construction that can easily incorporate the transmitted signal frequency components. It is also important to have efficient transmitting equipment for QRSS for effective frequency stability.
There are many challenges and limitations in operating the QRSS in two way radios. First of all, one has to make their custom-made equipment to have a satisfied and quality experience. Additionally, it is also important to consider the time taken to transmit at this low frequency. All these challenges and limitations in the construction, design and calibration of QRSS question its efficiency in transmission or for communication. However, it can be used in personal locator beacons where small amount of data is transmitted at a time.