My 3 year old GB4000 utilizes a 1.2 MHz carrier signal. The manual indicates frequency modulation. I believe, and I could wrong, the most revised GB4000 hardware uses a different carrier frequency. What is the carrier frequency of the machine you are utilizing?
JAB
The new GB4000 uses a 3.1 MHz RF (Radio Frequency) carrier wave. Because that's what Rife supposedly used. I don't know if it matters or not. Don't know if you can change the carrier wave or not.
The thing I like about the GB4000 is you can run 6 frequencies at once. This would save a lot of time.
Most of us on this forum use the F165. You can change the carrier (back frequency) to any frequency. But I think you can run only 1 other frequency at a time, unless it is a pulse.