Can anybody help me with varactor multiplier circuit data? I have some NEC varactor multipliers units ex 2034 mHz microwave links(56 mHz in and 2034 mHz out. 36 times ). . Lots of good parts inside and I thought I could convert them as beacons for 432 & 1296 but can't seem to find any circuit info on varactor multipliers.
Thanks
Brian VK4QB
Varactor Multiplier Data
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VK2XSO
Re: Varactor Multiplier Data
There is plenty of varactor diode multiplier circiuts in the RSGB VHF/UHF Handbook, or it's replacement, the international microwave handbook.
For simple applications, it's really just a matter of matching them as a load and filtering the output harmonics for the frequency required.
For simple applications, it's really just a matter of matching them as a load and filtering the output harmonics for the frequency required.
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VK4QB
Re: Varactor Multiplier Data
Thanks Trash,
Some of the references are a bit vague but I got the idea of Varactor triplers, enough to get some resemblance of order in my surplus NEC 3 stage varactor multiplier !! Ive got it multiplying to 1296 from 48 mhz . Powered by the old HP608D running flatout at +4 dbm, I'm getting some output on ?? from the last varactor(3rd) Nothing in my shack to measure anything over 300 mhz as yet, so New years resolution is a to build a 400 mhZ plus wavemeter as per UHF Compendium by K Weiner. I've yet to find out how to design and build solid striplines for 1296mhz ( not PCB type) Know anything on these ? Most of the data available is for the PCB type!.
Thanks for your help
73
Brian VK4QB
Some of the references are a bit vague but I got the idea of Varactor triplers, enough to get some resemblance of order in my surplus NEC 3 stage varactor multiplier !! Ive got it multiplying to 1296 from 48 mhz . Powered by the old HP608D running flatout at +4 dbm, I'm getting some output on ?? from the last varactor(3rd) Nothing in my shack to measure anything over 300 mhz as yet, so New years resolution is a to build a 400 mhZ plus wavemeter as per UHF Compendium by K Weiner. I've yet to find out how to design and build solid striplines for 1296mhz ( not PCB type) Know anything on these ? Most of the data available is for the PCB type!.
Thanks for your help
73
Brian VK4QB
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VK2XSO
Re: Varactor Multiplier Data
I'm spoilt. I just connect up the spec-an and a twiddle her and a tap there and ... aaarh ! I'll take that one... oh look... that's an interesting harmonic on 32GHz 
From an over simplistic point of view, it's just a matter of loading and matching each side of the varactor circuit.
You can also try multiplying with 1N914's, it's amazing what even an LED can do
From an over simplistic point of view, it's just a matter of loading and matching each side of the varactor circuit.
You can also try multiplying with 1N914's, it's amazing what even an LED can do