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 Amateur Radio Frequency Measurements:

 HF Balanced Bridges for HF SWR measurement: HFB5

Project by:

Antonio Alfinito / I2TZK

Frank Dziurda / K7SFN 

Dinesh Gajjar / VU2FD



 HF 1KW HF Balanced BRIDGE:  HFB5

Preliminary Project Information


HFB5 uses 2x Diode (BAT85) detector and a Tandem balanced bridge as a simple 1KW capacity SWR Bridge + RF Pickup for frequency measurement. 

Bridge Generates Forward and Reflected voltages suitable for SWM3 or GCPU/GCPUx LCD Displays.

HFB5 us designed for two variations:

1. Diode Detectors. (Present Kit)

2. AD8307 Log Detector add-on. (Future or self made)

HFB5 also output low level RF signal (SMA Connector) for Frequency display by GCPU LCD Displays and other future projects like Antenna Tuner etc which requires RF signal.


 Dual D9 connectors to support OLD SWM3 and New GCPU
Powder Coated Metal Case and SO239 Brass sockets
Click picture to enlarge
HFB5 1KW  HF Bridge (Diode Detector) Tech Doc 0-500MHZ RF Sensor Document
HFB5 HF 1KW Bridge Schematic- Diode Detector JPG
HFB5 HF 1KW Bridge Schematic Full (Includes AD8307 Add-on Board) JPG
HFB5 HF 1KW BRIDGE KIT PARTS LIST  (Diode Detector) 0-500MHZ RF Sensor Document
Understanding Tandem Bridges 0-500MHZ RF Sensor Document
HFB5 Calibration Procedure by Frank/K7SFN 0-500MHZ RF Sensor Document
 Buy HFB5  online

For online payments, shipping charges will be added on secure web page, from $5.00 upwards for Registered Air Mail. (based on total value of the KIT/Assembled)

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HFB5 1KW Balanced HF BRIDGE COMPLETE KIT (Diode Detector) with  FREE CASE 45.00

2CheckOut.com Inc. (Ohio, USA) is an authorized retailer for goods and services provided by Fox Delta.
HFB5: Diode Detector Kit Parts List
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PCBs available from our School Project website

2CheckOut.com Inc. (Ohio, USA) is an authorized retailer for goods and services provided by Fox Delta.


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