A bridge rectifier should make a fine frequency doubler. I have doubts a 1N4005 could do the job though, considering it's a rectifier diode. Try digging around on digikey for RF diodes that can handle at least 1 amp (50W into 50Ohm -> 1.4A peak, but only half of that on average). The HSMP-382x series seems like a decent starting point - some of them come with dual diodes in one package

I did some quick calculations in Octave, and a full bridge will give 4x the power on the 2nd harmonic compared to a half wave rectifier (single diode). Hope that helps

73 /Tomas, SA2TMS

On Sat, 2016-03-05 at 14:35 -0500, Robert Bruninga wrote:

Does anyone remember how to make a High level frequency doubler?  I need some energy on 902 MHz, and wonder about just blasting some diodes with a 451 MHz transmitter? (followed of course by a filter)...

Seems like a full wave rectifier would give a strong 2X frequency component?

I wonder if 1N4005's would do?  At 50W input the capacitance per diode is around 1 pF Bob, WB4APR _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb