Detector RFI,  RF-204

© Brooke Clarke, N6GCE 2002 - 2007


This is a Radio Frequency Interference detector that can "locate and isolate minute and intermittent sources of RF energy".  This can be used as a piece of test equipment and it's rumored also as an RF bug detector, although some testing does not support this using the stock parts supplied.  The probe is a tank circuit that's most sensitive at about 26 MHz according to the manual.


The main unit contains the electronics and has a belt clip.  Inside is a 6 Volt Ni-Cad battery that can be replaced by the Radio Shack Catalog #: 23-338 which is a 6 V 1500 mah Ni-MH battery pack that can be shoehorned into the main unit.

To charge the battery pack there's a custom made wall wart with a stnadard U.S. 3 prong mains plug and a cable to connect to the main unit.  A clue as to the use of this unit is the adapter cable that has a standard U.S. mains 3 hole socket on one end and a mil spec plug on the other end.  The mil spec connector is marked MS 3106A 18-9P.  It has two larger diameter pins that are longer than the 5 shorter pins.   The mating sleeve is threaded.
What military equipment has the MS 310?A 18-0S Socket?

The Probe contains a parallel resonate LC circuit the has a narrow impedance peak at 5.5 MHz and a broad impedance valley at 16.2 Mhz.  Not the type of thing you would use for bug sniffing.  The coax cable is RG-174 with what I think is an SMC plug.

The headphones are Telex p/n 610-1 (GY-W) 13913-386-002-000-2 with a standard 1/4" phone plug which probably also acts as the on-off switch.

Tapping rod is 0.265" dia x 6.5" long plastic.


TO 33A1-14-19-1.pdf ©Brooke Clarke, N6GCE 2002

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