CureZone   Log On   Join
Image Embedded The F-Scan2 - a critical evaluation
Stephan2 Views: 20,210
Published: 16 years ago

The F-Scan2 - a critical evaluation

Yesterday I received a used F-Scan2.

I was interested in the unit since I had similar ideas of building such a device myself 10 years ago. The idea is quite simple: If there exist pathogens in the human body that have specific resonant frequencies with which one can destroy them, then it should be, at least hypothetically, possible to detect them with some kind of electronic device. My initial idea was that one should be able to detect minute changes in the impedance of the body at those resonant frequencies.

A sort of spectrum analyzer for 'bugs'.

The other way that I thought possible was to use a combination of EAV (Electro-Acupuncture According to Voll) device and frequency generator. The same way a homoeopathist test his patients against a variety of homoeopathic remedies (or nosodes) an EAV device should be able to test those Rife- or Clark-frequencies.

About a year ago I entered some key-words into Google to see whether anyone had built such a device successfully, so I would not have to do it, and I found the F-Scan2. Soon I found this forum and read about the detailed discussions about the device. I was tempted to buy it earlier, however I found an article that wrote very critical about the F-Scan (not the F-Scan2) but then I decided to give it a try, getting it used there should not be such a big loss.

So I played with it for one day, looked at the electronic circuit and tested the device with an oscilloscope.

Circuit description

The device uses the Zilog Z84C1516 controller, a 50 MHz clock for frequency generation and a 16 MHz clock for the Zilog. It has a touch-screen display which makes it very easy to use.

In the 'DIRP' mode, the F-Scan2 scans between a minimum and a maximum frequency with given step size, which can all be entered via the touch-screen. Maximum total samples: 1000.

For the DIRP mode, one has to use one hand electrode in the left hand (the one that provides the ~12Vpp sinusoidal signal, the other hand electrode is ground) and place a finger electrode on the right middle finger. This finger electrode has two contacts, one is ground and the other one goes to the detection circuit.

The manufacturer has erased the label of the first chip in the detection circuit but by tracing the PCB routes and measuring the signals on the chip it was easy for me to understand which type of chip was used and then to search for that chip with the right pin-out.

This chip is an analog-to-digital converter (ADC) from Texas Instruments or other manufacturer that makes the same type of chip. It is a successive approximation ADC, it has 12-bit resolution at 20ksamples/s and sends the 12-bits through a serial port, that's why it has only 8 pins. My best bet is that it is the ADS 1286.

The chip receives a clock signal and a 'chip-select/shut-down' square-wave signal from the microprocessor. The ADS 1286 then sends its serial data to the microprocessor. The sampling frequency here is about 130 Hz.

During the DIRP, the F-Scan2 sends out two bursts of frequencies. The first burst is about 210 ms long, then a pause of 210 ms and then a smaller burst of 8-12 ms. This repeats every 700 ms or so, and each time the frequency is incremented. During the bursts, the device takes 16 samples, probably for averaging noise.

Now what exactly is sampled?? The sine-wave bursts have a 6 Volt DC offset, so the sinusoidal signal in the burst swings from 0 - 12 Volts. The right hand electrode and the two contacts on middle finger electrode provide a voltage divider. So about 4 Volts are sampled by the ADC. Not the amplitudes of the Rife- or Clark-frequencies are sampled but the changes in the DC-level that these frequencies were supposed to induce. With idea of an EAV detection circuit in mind, I guess.

The microprocessor then subtracts the 12-bit results from the two consecutive frequency samples and displays their absolute (positive) value on the touch screen.

 The bad news:

I compared DIRPS from my body with DIRPS from a resistive network and found no significant differences! I tried to lessen the noise in the circuit by adding a low-pass filter (a 1k resistor with a 1uF cap) which help a bit but I still could only see 'artifacts'. This is however preliminary, I will extend my scans through the whole frequency spectrum. So far I did 10kHz - 56kHz found harmonics which repeated every 1300 Hz or so (see other forum contribution by someone else), so I checked the 500 - 1600 Hz band and found this broad spectrum of peaks around 1300 that you can see on some of the web sites that discuss the F-Scan2. The same patterns show up when I 'dirped' my body or with a resistor network. I can duplicate the exact same pattern with resistors. I have also a vague idea where this 1300 Hz feature comes from.

Now I saw somewhere posted that such a scan would reveal the metals and other materials in the resistor - that is obviously nonsense. Then the F-Scan2 would also scan the material of the hand and finger electrodes, the wires, insulation, PCB material, lead & tin from soldering, etc.

So I must say I am pretty disappointed - I guess I have to spend more money and time to try to build my own 'Rife-Clark-scanner'. I hoped I would not have to do that by buying the F-Scan2.

So, anybody who wants to buy mine?? How much do you offer?

Anybody interested in Excel spreadsheets about my recent scan data and graphs should post here or send an e-mail to me.


Printer-friendly version of this page Email this message to a friend
Alert Moderators
Report Spam or bad message  Alert Moderators on This GOOD Message

This Forum message belongs to a larger discussion thread. See the complete thread below. You can reply to this message!


Donate to CureZone

CureZone Newsletter is distributed in partnership with

Contact Us - Advertise - Stats

Copyright 1999 - 2021

0.170 sec, (4)