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4S-1W Fox Hunt Attenuator
Designed by David Cripe, NMØS
Click for larger image.
Kitted and Offered For Sale By The Four State QRP Group
Originally designed for new Boy Scout hams to build and use, this kit was introduced at OzarkCon 2016. It is a simple 1 watt RF attenuator which is very
useful for VHF Fox(transmitter) Hunting. When the hunter is close to the
transmitter beacon, the signal overloads the receiver (usually a hand held) and an attenuator must be used to regain sensitivity for the final "pounce". This kit provides that attenuator.
Most of the assembly revolves around assembling the PCB enclosure, and an experienced builder will have the whole kit assembled in about 30 minutes. The kit contains three very large SMD resistors, they are 1/4" long by 1/8" wide which is the same length but wider than a standard 1/4W resistor with leads, these big SMD parts are super easy to solder! If you would like an attenuation other than 20dB, click on the link to MØUKD's calculator.
Not familiar with VHF transmitter hunting? It's great fun, for more info here is a good source for Fox Hunting articles
This is an excellent club project and a
quantity discount is available, 5 piece minimum order pse.
Specifications and Design Features
Attenuation: 20 dB attenuation as kitted.
Optional Attenuation: Can be built for 1 to 30dB with your own resistors (through hole or smd).
Enclosure: Attractive silk screened, pre-drilled, and easy building PCB enclosure
is included in the kit
Enclosure dimensions: 2.0" x 1.125" x .75"
Connectors: Board mounted BNC connectors.
Part List BOM
PCB Layout Part Location.
Photo Page Rig pix and building tips.
MØUKD's FB PI Attenuator Calculator Posted with permission.