For those who may be curious, I dug out the schematic for my version
of the quadrature-driven DBM frequency doubler and posted it to
ko4bb.com. It uses a quadrature hybrid coupler to generate +45 and
-45 degree signals at 5MHz, buffers them with emitter followers, and
applies them to the RF
Luciano,
I will put this in OrCAD/CADENCE PSPICE over the weekend
and see what it looks like.
-George
On 11/14/2014 02:53 AM, tim...@timeok.it wrote:
George,
you can replace the input transformer with the mini-circuits model
T2-613-1-KK81 or T662-KK81 for under 2 Dollars. The inductors L1
We are using Wenzel with two filters see attached if it will pass. 20 Mhz
is down more than 60 db and 5 MHz 55. Distribution Amp takes care of the
rest.
Bert Kehren
In a message dated 11/12/2014 8:13:33 P.M. Eastern Standard Time,
dgmin...@mediacombb.net writes:
Just a few days
I would like a copy of the article please.
cheers, Graham ve3gtc planoph...@aei.ca
On 2014-11-13 00:47, Don Latham wrote:
I digitized the first 2011 article to hand, the one in Jan-Feb; it's a smaller
article, and not as elegant as the later one. Anyone interested can email me
off-list.
Hi all,
I can suggest a different solution I have tested to have some important
improvement. First, the lower phase shift sensitivity with the use of a low
pass filter in conjunction with two notch filters instead the high Q band pass
filter, second the unity gain to avoid a 13/20 dB
Luciano,
This looks very nice. However, the inductors are
custom made. It would be nice to have a
off the shelf parts solution so it can be made
easily.
Any ideas ?
-George, N2FGX
On 11/13/2014 08:39 AM, tim...@timeok.it wrote:
Hi all,
I can suggest a different solution I have tested to have
Is that the A Two Diode Frequency Doubler article by John Pivnichny?
DaveD
On 11/12/2014 10:47 PM, Don Latham wrote:
I digitized the first 2011 article to hand, the one in Jan-Feb; it's a smaller
article, and not as elegant as the later one. Anyone interested can email me
off-list. You're
George,
you can replace the input transformer with the mini-circuits model
T2-613-1-KK81 or T662-KK81 for under 2 Dollars. The inductors L1 and L3 are
standards value you can find smd or standard on ebay. About L4 you can put in
place a standard 4.7uH value increasing the series capacitor for
Several list members contacted me expressing interest in the
article. None of them were able to download much or anything
from the ARRL QEX web site. That includes me and other ARRL members.
I am working the issue with one call to ARRL so far today. I will
contact Larry Wolfgang at ARRL and see
I am able to download the files associated with the article, but not the
article itself. Guess I need to be a paying member to get the article. The
only files in the download are the XLS file for calculating the filter
values, and the parts list.
It's at http://www.arrl.org/qexfiles in the
It's interesting. I took the hint, and tried sin(a)*sin(b) expand and set
b=a+pi/2. fun fun fun.
All that's needed in theory is a mixer and a pi/2 phase shifter at 5 MHz.
Probably a bunch of other stuff because of real parts :-) Minicircuits will
sell you one, packaged, for about 50 rasbucknicks.
Only a small subset of QEX articles on available in digital format. This
isn't one of them. We'll either need to get a copy from the author, or
from a QEX subscriber.
On 11/12/2014 2:34 PM, Dave M wrote:
I am able to download the files associated with the article, but not
the article itself.
, November 12, 2014 4:41 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Quad Driven Mixer 5 to 10 MHz Doubler Atricle
Only a small subset of QEX articles on available in digital format. This isn't
one of them. We'll either need to get a copy from the author
I believe I have a PDF copy of the article if anyone wants it. It's
about 1.3 MB in size.
DaveD
On 11/12/2014 2:36 PM, Don Latham wrote:
It's interesting. I took the hint, and tried sin(a)*sin(b) expand and set
b=a+pi/2. fun fun fun.
All that's needed in theory is a mixer and a pi/2 phase
John wrote:
It is a cute technique, not originated by me, but useful.
Indeed it is. I designed a similar one using a quadrature hybrid
splitter and level 7 mixer, and it's almost scary how well it
works. It's as cute as a regenerative divide by two using a DBM.
Best regards,
Charles
-boun...@febo.com] On Behalf Of Oz-in-DFW
Sent: Wednesday, November 12, 2014 4:41 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Quad Driven Mixer 5 to 10 MHz Doubler Atricle
Only a small subset of QEX articles on available in digital format. This
isn't one
: Wednesday, November 12, 2014 10:36 PM
Subject: Re: [time-nuts] Quad Driven Mixer 5 to 10 MHz Doubler Atricle
I believe I have a PDF copy of the article if anyone wants it. It's about
1.3 MB in size.
DaveD
On 11/12/2014 2:36 PM, Don Latham wrote:
It's interesting. I took the hint, and tried sin(a)*sin
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
I'm a member, and the article is not there -- just the Excel spreadsheet
and a Word document of the parts list.
Too bad, I have a handful of 5 MHzx TCXOs.
I may have hardcopy of the issue, will have to dig for it.
Jim
wb4...@amsat.org
On 11/12/2014 3:34 PM, Dave M wrote:
I am able to download
Looked it up and pretty amazing. Can't really say how well the ferrite will
go down to 5. It should.
Paul
WB8TSL
On Wed, Nov 12, 2014 at 7:22 PM, Dave M dgmin...@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
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 dgmin...@mediacombb.net wrote:
Just a few days ago, I
Hi
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.
Bob
On Nov 12, 2014, at 8:20 PM, paul swed paulsw...@gmail.com wrote:
Looked it up and pretty amazing. Can't really say
I mentioned my article because it is a useful technique. The major virtues are
that it is analog, thus possibly a lot less noise than an XOR, it is easy, and
the
fundamental and all of the odd harmonics are well suppressed.
I make no claim that it is better or cheaper, or is a prettier color
Brian wrote:
Personally, I'm lazy and like the Wenzel full wave rectifier
design with a nice BPF on the output to obtain a clean 10MHz.
The advantage of the multiplier circuit is that the signal straight
out of the mixer has excellent harmonic and 5MHz suppression. In my
circuit with the
I digitized the first 2011 article to hand, the one in Jan-Feb; it's a smaller
article, and not as elegant as the later one. Anyone interested can email me
off-list. You're allowed to have a copy for your own use, just can't
re-publish.
Don
Jim Sanford
I'm a member, and the article is not there
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