Hi 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.
Bob > On Nov 12, 2014, at 7:22 PM, Dave M <[email protected]> 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 >> >> > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
