High power Dual Directional Coupler 50-450 MHz up-to 5 kW by F1FRV Rev 2: february 2014 |
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This directional coupler is based on W1GHZ paper " High-Power_Directional_Couplers_with_Excellent_Performance.pdf ".
It is designed for measurements in the range 50-450 MHz up-to 5 kW, Design coupling is ~44 dB @ 144 MHz.
It works also well under these frequencies but, with less coupling.At 1300 MHz, poor SWR & directivity to expect.
For use only in HF bands, 1.8-30 MHz, there is an alternative. Use a SWR/PWR board without the rectifiers. See simulation HERE.
For UHF - SHF, up-to 2.4 GHz, see W1GHZ descriptions in his paper.
SWR and Directivity are ok for amateur accurate enough power & SWR measurements.
Box dimensions are 9"x7"x2", this is a standard "BUD" aluminium box, available at Radiospares, Mouser and others.
Test bench
Measurements 20-450 MHz
Measurements Low Bands
Measurements 1150-1350 MHz
Power detection calculations
For now, That's All Fox !!!!!
Enjoy !!!!
Download ALL documentation, drawings and bill of materials
Download only precise measurements for each band
Download only pics of assembly
Dominique - f1frv@sfr.fr 
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