home *** CD-ROM | disk | FTP | other *** search
-
- An RF Probe, Sniffer.
- ---------------------
-
- Technical Specifications:-
- --------------------------
-
- Range......................... 10MHz to 500MHz.
- Useful Range.................. 400KHz to 1.3GHz.
- Input Impedance............... High(ish).
- Display type.................. Analogue.
- Display Lag Time.............. Approximately 0.5 Seconds.
- Calibration................... None.
- Accuracy...................... Not Applicable.
-
- ----------------------------------------------------------------------------
-
- Overview:-
- ----------
-
- This device is used to set up all types of tuned RF stages in transmitting
- equipment. It detects the RF voltage generated at each stage from the
- main oscillator through to the final PA (Power Amplifier). The detector
- will detect the voltages generated at 10 Watts into 50 Ohms without damage
- at 500MHz. It could also be used to align IF (Intermediate Frequency)
- circuits if required. There is no need to calibrate the device as it is
- used purely as a voltage detector, just connect to the stage to be tuned
- and tune that stage for a maximum deflection on the ~meter~. IF the
- reading is at maximum already, then adjust the gain control to give about
- half deflection on the ~meter~ and tune that stage again, keep doing this
- until a peak is found and displayed on the ~meter~. If a piece of wire
- is connected to the probe tip it could be used as an uncalibrated Field
- Strength Meter.
-
- ----------------------------------------------------------------------------
-
- Construction:-
- --------------
-
- 1) Cut a piece of Vero Board (Stripboard) 4 Strips wide by 15 holes long.
- Note that hole 1 is on the Left as viewed from copper strip side and
- row 1 is at the top.
- 2) Remove all of the strip on row 3.
- 3) Remove all of the strip except the last 2 holes on row 2.
- 4) Remove the strip at holes 3, 8, 9 and 10 on row 1.
- 5) Fit all of the components to the Stripboard as per the ~Circuit~
- drawing. Note the polarity of the 2 diodes and the position of the
- solder tag.
- 6) Connect the coaxial cable and the three coloured wires also.
- 7) Drill the metal box to fit the gain control (VR1) and the assembled
- Stripboard. The positions of these two items is NOT critical.
- 8) Connect the three coloured wires as per the ~HardWare~ drawing.
- 9) Connect the coaxial cable to the gain control (VR1) as shown in the
- ~HardWare~ drawing.
- 10) Drill the bottom case assembly to allow the coaxial cables to go
- through, 1/4 Inch (6mm) in diameter. One at each end.
- 11) Fit the RCA/PHONO plug as per the ~HardWare~ drawing, inner of the
- cable to the plug pin and the braid of the cable to the plug body.
- 12) Make a ~Probe~ similar to Project5 and also fit the crocodile clip
- as per the ~HardWare~ drawing.
- 13) Assemble the metal box using the supplied screws.
- 14) Fit the knob to the gain control.
-
- ----------------------------------------------------------------------------
-
- Using the RF Probe:-
- --------------------
-
- *** WARNING ***
-
- DO NOT USE WITH DC VOLTAGES GREATER THAN 50 VOLTS.
-
- 1) Swicth OFF the AMIGA and read the ~Warning~ file.
- 2) Connect the A-D Converter to the Parallel port.
- 3) Connect the RF Probe PHONO plug to the A-D Converter.
- 4) Check the connections, then switch ON the AMIGA.
- 5) Start up the ~RF_Sniffer~ software from its icon.
- 6) You are now ready to use the ~RF_Sniffer~.
- 7) When finished, switch OFF the AMIGA and disconnect all of the hardware.
-
- ----------------------------------------------------------------------------
-
- Acknowledgements:-
- ------------------
-
- First of all many thanks to my wife Tricia who allows me to spend many hours
- on my computers.
-
- Also to David Benn and Herbert Breuer for the ACE/AIDE combination supplied
- on an AMIGA FORMAT floppy disk which made it easy to compile this program.
-
- Also to Laurence J Greatorex for giving these a shakedown on his A1200 with
- a Turbo LC '030 accelerator board and 32MB of fast ram, also to Bob Eva for
- testing on his A1200 system, with a total of 10MB of ram, and to all the
- other people that have given any of these projects a rigorous testing.
- And finally to anyone else who I may have neglected or forgotten.
-
- ----------------------------------------------------------------------------
-
- Mr Barry Walker,
- 70 King George Road,
- Loughborough,
- Leicestershire,
- LE11 2PA,
- England.
-
- Email to:-
-
- 106161.3245@compuserve.com
- or
- wisecracker@tesco.net
-
- BYE.....
-
- ----------------------------------------------------------------------------
-