[amsat-bb] Frequency Doubler?

Tomas Härdin tjoppen at acc.umu.se
Mon Mar 7 09:38:21 UTC 2016

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

/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
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