Antenna Noise
Bridge kit
Cambridge Kits
Poor reports ?
Antenna Fault ?
Traps off-tune ?
Storm Damage ?
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Check FAST with an
ANTENNA  NOISE  BRIDGE,
Measure RESONANCE 1-160 MHz and RADIATION RESISTANCE 2-1000 ohms (50 ohms mid-scale) without transmitting, no 10 second limit, measure inside and outside the amateur bands, find where it is 50 ohms, get accurate answers directly, no confusion with harmonics, no frequency pulling, also adjust your ATU, measure phasing lines, RF resistance and hence Q of loading coils, preamplifier matching or use it as a noise generator, transceiver protected, needs 9V dc or internal battery, 4x7x13 cm, 250 g.

"delightful little unit ... most useful", Radio Communication.
"you have saved me hours", LC in Tonbridge.
"worked first time and accurately", FJ in Hayes.
"shown up a fault I never suspected", PJF in Washington, Co. Durham.
"very good value ... essential tool", Practical Wireless.
"still using after 15 years", AK, Japan.
The kit includes all parts, case, screws, wire etc, coils are pre-wound, and the detailed assembly and operating instructions include a circuit diagram and description.
The kit includes a ready-cut piece of copper laminate and full size foil pattern for easy drawing, etching and drilling of the circuit board. The circuit board is 104 mm long, single sided with wide tracks and generous spacings as shown here
and the kit includes ordering details for etch resist pen and ferric chloride.


If someone wants to offer a PCB (drilled or undrilled) for this kit, then their contact details can be announced here.