Monitor Infrasound

The InfraSignal Radio has a regular audio mode. This mode is very useful when used with an infrasound microphone or an infrasound hydrophone whose frequency response also covers the audio frequency range.

Assuming you are monitoring an infrasound signal using one of the non-scanning modes i.e., INFRASIGNAL ON CHART, INFRASIGNAL ON SCOPE, 1 CHANNEL ON CHART, 1 CHANNEL ON SCOPE or FREQUENCY MEASUREMENT. You can switch to AUDIO ON VU METER to see if you hear a sound with the same rhythm.

This can help you identify the source of the infrasound. You can measure the frequency of this infrasound by using the procedure described in the MEASURE FREQUENCY paragraph. The ALARM function is not available in the AUDIO ON VU METER mode.

ON the right side of the radio is an ON/OFF power switch and two (2) phone jacks. These phone jacks, by design, require a more than usual amount for insertion force.

The top (black) phone jack outputs the infrasignal at a fixed level. This output is provided for recording and/or monitoring on a video display. When using the AUDIO ON VU METER mode, regular audio can be heard from this jack at a fixed level. This output is quite loud in most headphones.

The bottom jack (gray) provides regular audio and tone adjusted transformed infrasignal audio. The audio level from this jack is adjustable with the volume control. When a headphone is plugged into the audio phone jack, it disconnects audio from the speaker. It does not disconnect alarm sound from the speaker and alarm sound is not heard in the headphones.