With the figure you showed isn't really what is transmitted in SSB. Rather, it is a rectified sin wave, such that half of it is shown at 0, and the other half shown above. As sound doesn't really change that much over the frequency of sound waves, this is an acceptable way to show the signal. The carrier wave is then the part of the signal at 0.

2016年5月9日 · I'm trying to learn about how SSB modulation works. My current understanding from reading and looking at spectrum plots from SDR software is that the sound is modulated with the carrier, but only half the carrier wave. (Alternatively, the sound's 0-point is offset either plus or minus a bit, and then modulated against the half-wave carrier.)

2016年11月15日 · Side bands are a natural result of the mixing of two or more electro-magnetic wave-forms, and and SSB is the use of one of those wave-forms to transmit information. In demodulating SSB, unlike AM, the audio heard after demodulation, is actually the resultant frequency difference between the carrier or "center frequency" and the imposed audio.

2020年8月5日 · $\begingroup$ Thanks Phil, the main points i get from your answer is that a square wave is composed of many sine waves at every odd harmonic and that you can turn a square wave into a sine wave by using a low pass filter, and that using a BFO with harmonics will result in undesired frequencies appearing in the output of the mixer.

2013年10月26日 · SSB has no carrier, and the transmitter does not transmit anything when the operator is not speaking. There is no way to transmit the presence of silence to the receiver. Instead, you'll hear atmospheric noise, local and remote electrical noise (arcing in relays, remote thunderstorms and all that), RF hash from computers and other electronics.

2022年12月31日 · So if SSB were a black-box problem, the answer is, an audio signal drives a radio frequency signal off of its "base" or "center" frequency, by whatever the audio frequency signals frequency is, in the direction determined by whether the black-box is outputting upper sideband, or lower sideband.

2013年11月19日 · Mostly, EM propagation is linear, so the differences in modulation have little effect on how the wave propagate. However, if you expand propagation to include the intelligibility of the signal at the other end, modulation can make a very big difference. Though propagation can practically be considered linear, it is not time-invariant. On VHF ...

2023年6月27日 · The conventional AM, SSB, CW, and FM then the various Data modes like RTTY, PSK, and a seeming myriad of others. Ham radio offers such esoteric activities as Moon bounce or EME (Earth-Moon-Earth communications) and also a variety of satellite capabilities for extending the reach of your signal (in particular, your VHF/UHF signal).

Normally, SSB filters are at higher frequencies, say above 3-4 MHz, for technical reasons (design characteristics of the crystals). That said, have a look at using your computer as filter. There are nice tricks to use even the sound card for digital filtering.

2020年4月23日 · In addition to the "filter method" described earlier, SSB can be generated by the "phasing method." As such, it is a special case of quadrature amplitude modulation (QAM). This implementation - adding or substracting quadrature versions of a signal to produce upper or lower sideband - may more clearly illustrate the distinction between the two.