Modulation monitor software

The power rating is from 1. The model RF-AM1K is an ideal solution for moderate powered medium wave, short wave or amateur broadcast transmitters. The model RF-AM2K is an ideal solution for high powered medium wave, short wave or amateur broadcast transmitters. The model RF-AM5K is an ideal solution for high powered medium wave, short wave or amateur broadcast transmitters. Variable RF Sampler 4, watts.

RF Demodulator watts. Splatter View 2K. Splatter View 5K. Frequency Response:. Rated Input:. Sampler Output:. Connectors In:. Connectors Out:. SO BNC. Once set up and operating, any time you see any flat lines on the zero line, it is indicating excessive negative modulation. What you do not want to see is when the two halves of the waveform meet in the middle as a flat line — as seen above — even for a moment.

Depending upon your transmitter, antenna system, and frequency of occurrence, the spatter that is caused can become rather obnoxious. Once this is set up each graticule will represent The optimum condition is when the modulation peaks just kiss the top and bottom lines without going over and you do not see any bright spots at the centerline.

To clarify one item that is often confused: the downward going waveform beyond 1. In this configuration, negative modulation is shown only in the area between 1.

This now displays only the upper half of the waveform each graticule now represents You do not want to see any excursions go above the top line. The difficulties of determining the modulation using this method is that depending on how the triggering is set on the scope you may not see the shots with the highest peaks. I have noticed on the newer LCD scopes that it is often very difficult to get the scope to trigger where it is easy to see the uppermost excursions.

A second method of measuring modulation with an oscilloscope, often referred to as the trapezoidal method, can provide easier interpretation of the modulation levels. For this method, you will need a scope that has an XY option, normally a dual-trace or better.

This measurement uses the same set up as before, but with an added input and utilizing the X-Y mode of your scope. The added input will be sample of the audio input to the transmitter. This sample has to be after the processor and is typically picked off the processor outputs or the transmitter input. The tricky part of this is that you cannot just hook up your scope to that audio line since the input to the scope is unbalanced and the audio line should be balanced.

Connecting the scope directly would ground the audio line and knock the audio level down greatly, not to mention the hums and buzzes that might show up. What you need to hook this up is some sort of isolation. I use a 10k Ohm — 10k Ohm, 15 kHz rated transformer to do this. Using a high-Z transformer such as a Triad SP allows a sample to be picked off the audio line with only a very slight amount of loading that is negligible in most situations.

A distribution amplifier may also be used. It is one-time only, per window size selected. Windows Installer V1. Switching monitors would sometimes result in a crash. Help should now display properly on all operating systems. If you are using the monitor for remote readings, all copies of the modulation monitor software must be upgraded.