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

Bob Camp kb8tq at n1k.org
Wed Nov 12 20:26:07 EST 2014


The Wenzel doubler has a bit of “stuff” in the middle of the bridge. It’s tuned a bit to give it best performance at a specific frequency. It’s not narrowband, but it is not a 2:1 bandwidth.


> On 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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