SignalPen(TM)
Our device, in the style of a pen. A portable device that you hold at the end of the pen to detect any RF signal source in close proximity without a battery. It uses RF electromagnetic field as a power source to light up an indicating light. Simple tool/instrument to locate or troubleshoot any RF source from handheld transceiver, mobile radios, or base station and radio repeaters. This device also detects a high voltage AC power line from 15kV and above, also a handy tool for electrician. Just store in shirt pocket like your other pens!
Self-Powered RF Detection Light (No Battery Needed)
Product Dimensions: The size of a pen
Specifications: 60 Hz to 1.2 GHz
For Optional Models: 2.4 to 6 Ghz Min. to Max.
RF Powered Detection: Milliwatts to Kilowatts
Proximity Detection: Wireless: 0.5 in to 3 ft
Capable of in-circuit detection from 20 mW. 30 seconds at 100W
Warranty: 3 years warranty no matter what, except:Intentional breakage and tampering of device
USER MANUAL
AM broadcast transmits on a low frequency with large antennas. Consequently it takes a large antenna to receive the signals. Typical “antennas” are AC house wiring, phone lines, long satellite or cable TV cables, DSL/CAT5 lines running between rooms, etc. The device wires that connect to these “antennas” need to be choked with as many turns through the ferrite as possible. Some installation examples are shown below on this page.
For AC/ DC power cords and coax cables the F240-77 (2.4″ OD, 1.4″ ID) “Donut” toroid is the most popular. Also available are smaller toroid donuts and Mix 77 beads. Shown below is a graph with 8, 10, and 12 turns through the toroid – obviously more turns has higher choking impedance. Mix 77 toroid products are HERE and Mix 77 small beads (for small wires) are HERE
F240-77 Turns Comparison from .1 – 8.1 Mhz
Shown below is a graph of frequency response verses choking magnitude for a F240-77 in the AM Broadcast band for a 12 turn coil around the toroid. (Same info as above but different frequency range).
F240-77 Choking Impedance in AM Broadcast Band
Typical Installations for Donut/Ring Toroids
 AC Cable on F-240 Toroid – 6 turns |
 Ethernet Cable on F-240 Toroid – 7 turns |
 Audio or Mic cable on F240- 12 turns |
Extra Mix 75 Snap On Beads HERE – VERY effective for AM Broadcast RFI