Please refer to the several conversion tables and calculation tables that are posted. Also, we have created a device that allows for a direct visual check for the final confirmation of SSB, so we would like to introduce it to you. Since SSB signals are single-sided sideband signals, this device allows for direct visual confirmation of how much the opposite sideband is suppressed compared to the original sideband signal. However, a spectrum analyzer with a TG is required.

Unit conversion table/LC resonance/ATT calculation table

Toroidal Calculation Table

Opposite side suppression direct vision device

Connect the output of the tracking generator to J1, input the carrier point of the frequency you want to monitor from J2, and convert it with AN614. The converted result is passed through a low-pass filter of about 10KHz, and this signal is used as the modulated signal to be measured. For example, if you want to monitor the output of a 455KHz modulator (SSB signal), the local frequency = 455KHz does not need to be a locked frequency, you can use an oscillator you have. The settings of the spectrum analyzer are center frequency = 455KHz, and the span is set to ±2.5KHz = 5KHz including one side/upper side if the one-side band you want to monitor is 2.5KHz. This makes the TG scan = 452.5KHz to 457.5KHz, and the TEST signal OUT converted by AN614 is scanned from 2.5KHz to 0Hz and 0Hz to 2.5KHz. In other words, at the 0 Hz point, TG = 455KHz, 2.5KHz to 0Hz = direct view on the LSB side, and 0Hz to 2.5KHz = direct view on the USB side.

This is the measurement result of the modulation output (LSB) of 455KHz. It is less than -70dB within the 2.5KHz band. If you put an oscillator with the same frequency as the frequency of the device to be measured (3.5M/7M/14M) into the mixer, you can measure any frequency.	455KHz measurement result