[time-nuts] Quad Driven Mixer 5 to 10 MHz Doubler Article

Bob Camp kb8tq at n1k.org
Wed Nov 12 21:08:31 EST 2014


In the “as wired” configuration, that looks more like a full wave doubler than the full Wenzel tuned multiplier. You may be able to re-wire it for the full circuit.


> On Nov 12, 2014, at 8:20 PM, paul swed <paulswedb at gmail.com> wrote:
> Looked it up and pretty amazing. Can't really say how well the ferrite will
> go down to 5. It should.
> Paul
> On Wed, Nov 12, 2014 at 7:22 PM, Dave M <dgminala at mediacombb.net> wrote:
>> Just a few days ago, I ordered parts to build a couple of the Wenzel
>> 2-diode doublers, described in the same article as your full-wave diode
>> doubler, just in time to discover them on Ebay (via slow boat from China),
>> item# 171511157159.  I inspected the components and layout in the picture
>> in the listing, and it certainly looks like the Wenzel FWB doubler.  At
>> $9.99 USD, the price is cheap enough, especially since you get SMA
>> connectors on both ends.  Might have to do a bit of solder work on the SMA
>> connectors if you want to put it into a little box.
>> The listing on the doubler on Ebay says that the low end is 10MHz, but
>> I'll bet that it  will get down to 5MHz quite easily  If there's any
>> trouble handling a 5MHz input, you could easily use a lower frequency
>> ferrite for the balun and make it work.
>> As  you suggest, a BPF on the output and maybe a bit of amplification to
>> get the level up to a usable level should get you a fairly clean 10 MHz.
>> Dave M
>> Brian, WA1ZMS wrote:
>>> Gentlemen-
>>> I have my paper copy in front of me with the original article.
>>> I am not certain that I can just scan it and send it around due to
>>> ARRL & Author copyright matters.  But I am willing to scan it.
>>> With all due respect to John, K6IQL the author who spent much time
>>> on his design......I would opine that an equivalent doubler could be
>>> made from the Wenzel doubler circuits that are on the Wenzel web
>>> page and from first-hand experience...I used such a 5-to-10 MHz
>>> doubler
>>> for all of my amateur radio projects up through 403GHz.
>>> The K6IQL design, in brief, splits the 5MHz signal into two paths.
>>> One passes to the LO port of a Double Balanced mixer, while the
>>> second path goes through a 90-deg phase shift network and into the
>>> RF port of that JMS-1MH mixer.  The output is taken from the IF
>>> port. The output is then buffered & filtered. He spent much design
>>> effort
>>> on the 90-deg phase shift network to keep it all temp stable.
>>> Personally, I'm lazy and like the Wenzel "full wave rectifier" design
>>> with
>>> a nice BPF on the output to obtain a clean 10MHz.
>>> -Brian, WA1ZMS/4
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