Quad Driven Mixer 5 to 10 MHz Doubler Atricle
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 what Ican bust loose. So
hang in there. It is a cute technique, not originated by me, but
useful. Right now I have to get the ARRL FMT done first.
-73 john c roos k6iql
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 year 2011 listings, filename
3x11_Roos.zip
titled "Converting a Vintage 5 MHz Frequency Standard to 10 MHz with a Low
Spurious Frequency Doubler"
Dave M
John C. Roos via time-nuts wrote:
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 what Ican bust loose. So
hang in there. It is a cute technique, not originated by me, but
useful. Right now I have to get the ARRL FMT done first.
-73 john c roos k6iql
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.
Don
Dave M
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 year 2011 listings, filename
3x11_Roos.zip
titled "Converting a Vintage 5 MHz Frequency Standard to 10 MHz with a Low
Spurious Frequency Doubler"
Dave M
John C. Roos via time-nuts wrote:
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 what Ican bust loose. So
hang in there. It is a cute technique, not originated by me, but
useful. Right now I have to get the ARRL FMT done first.
-73 john c roos k6iql
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
--
"The power of accurate observation is commonly called cynicism by those who
have not got it."
-George Bernard Shaw
Dr. Don Latham AJ7LL
Six Mile Systems LLC
17850 Six Mile Road
Huson, MT, 59846
mail: POBox 404
Frenchtown MT 59834-0404
VOX 406-626-4304
Skype: buffler2
www.lightningforensics.com
www.sixmilesystems.com
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. 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 year 2011 listings,
filename 3x11_Roos.zip
titled "Converting a Vintage 5 MHz Frequency Standard to 10 MHz with a
Low Spurious Frequency Doubler"
Dave M
John C. Roos via time-nuts wrote:
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 what Ican bust loose. So
hang in there. It is a cute technique, not originated by me, but
useful. Right now I have to get the ARRL FMT done first.
-73 john c roos k6iql
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
--
mailto:oz@ozindfw.net
Oz
POB 93167
Southlake, TX 76092 (Near DFW Airport)
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 shifter at 5 MHz.
Probably a bunch of other stuff because of real parts :-) Minicircuits will
sell you one, packaged, for about 50 rasbucknicks.
Don
Dave M
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 year 2011 listings, filename
3x11_Roos.zip
titled "Converting a Vintage 5 MHz Frequency Standard to 10 MHz with a Low
Spurious Frequency Doubler"
Dave M
John C. Roos via time-nuts wrote:
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 what Ican bust loose. So
hang in there. It is a cute technique, not originated by me, but
useful. Right now I have to get the ARRL FMT done first.
-73 john c roos k6iql
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
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
As a subscriber to QEX I saw this article but thought that the "bi-phase
rectifier" was a lot easier and has be well characterised by the
"time-nuts" experts. Now it has shown up here I would be interested to hear
from those experimenting how badly the NE602 performs compared with a
passive DBM for "nuts-style" applications :-)) I have a pile of kit with
5MHz VCXOs (Racal and Marconi) including an excellent GPSDO by Rapco.
Alan
G3NYK
----- Original Message -----
From: "Dave Daniel" kc0wjn@gmail.com
To: "Discussion of precise time and frequency measurement"
time-nuts@febo.com
Sent: 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(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.
Don
Dave M
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 year 2011 listings, filename
3x11_Roos.zip
titled "Converting a Vintage 5 MHz Frequency Standard to 10 MHz with a
Low
Spurious Frequency Doubler"
Dave M
John C. Roos via time-nuts wrote:
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 what Ican bust loose. So
hang in there. It is a cute technique, not originated by me, but
useful. Right now I have to get the ARRL FMT done first.
-73 john c roos k6iql
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
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
wb4gcs@amsat.org
On 11/12/2014 3:34 PM, Dave M wrote:
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 year 2011 listings,
filename 3x11_Roos.zip
titled "Converting a Vintage 5 MHz Frequency Standard to 10 MHz with a
Low Spurious Frequency Doubler"
Dave M
John C. Roos via time-nuts wrote:
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 what Ican bust loose. So
hang in there. It is a cute technique, not originated by me, but
useful. Right now I have to get the ARRL FMT done first.
-73 john c roos k6iql
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
This email is free from viruses and malware because avast! Antivirus protection is active.
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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 quadrature hybrid, 5MHz feedthrough is less than
-45dBc and the most prominent harmonic (30MHz) is less than
-30dBc. The visible spurs are all odd harmonics of the 10MHz output,
so the signal is symmetrical and for many uses does not need any
further filtering. I generally use a 2-pole active filter that
reduces the 30MHz to better than -55dBc, and if I need to get crazy I
can add a simple series LC at the output to get the 30MHz below
-70dBc. This strategy minimizes the risk of temperature-dependent
phase shift from the steep filter that would be necessary to reduce
the spurs to those levels following a diode doubler.
Best regards,
Charles
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 -- 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
wb4gcs@amsat.org
On 11/12/2014 3:34 PM, Dave M wrote:
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 year 2011 listings,
filename 3x11_Roos.zip
titled "Converting a Vintage 5 MHz Frequency Standard to 10 MHz with a
Low Spurious Frequency Doubler"
Dave M
John C. Roos via time-nuts wrote:
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 what Ican bust loose. So
hang in there. It is a cute technique, not originated by me, but
useful. Right now I have to get the ARRL FMT done first.
-73 john c roos k6iql
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
This email is free from viruses and malware because avast! Antivirus
protection is active.
http://www.avast.com
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
--
"The power of accurate observation is commonly called cynicism by those who
have not got it."
-George Bernard Shaw
Dr. Don Latham AJ7LL
Six Mile Systems LLC
17850 Six Mile Road
Huson, MT, 59846
mail: POBox 404
Frenchtown MT 59834-0404
VOX 406-626-4304
Skype: buffler2
www.lightningforensics.com
www.sixmilesystems.com
I would like a copy of the article please.
cheers, Graham ve3gtc planophore@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. 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 -- 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
wb4gcs@amsat.org
On 11/12/2014 3:34 PM, Dave M wrote:
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 year 2011 listings,
filename 3x11_Roos.zip
titled "Converting a Vintage 5 MHz Frequency Standard to 10 MHz with a
Low Spurious Frequency Doubler"
Dave M
John C. Roos via time-nuts wrote:
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 what Ican bust loose. So
hang in there. It is a cute technique, not originated by me, but
useful. Right now I have to get the ARRL FMT done first.
-73 john c roos k6iql
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 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 -- 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
wb4gcs@amsat.org
On 11/12/2014 3:34 PM, Dave M wrote:
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 year 2011 listings,
filename 3x11_Roos.zip
titled "Converting a Vintage 5 MHz Frequency Standard to 10 MHz with a
Low Spurious Frequency Doubler"
Dave M
John C. Roos via time-nuts wrote:
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 what Ican bust loose. So
hang in there. It is a cute technique, not originated by me, but
useful. Right now I have to get the ARRL FMT done first.
-73 john c roos k6iql
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
This email is free from viruses and malware because avast! Antivirus
protection is active.
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and follow the instructions there.
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 and LO inputs of a Level 7 DBM. The file name
is "Frequency doubler quadrature DBM" (it should be searchable once
it is moved out of the recent upload directory).
Due to the excellent balance of the quadrature hybrid coupler and the
DBM, the spurious products in the mixer output are all odd-order
harmonics of 10MHz, the strongest being 30MHz at about -35dBc. The
5MHz feedthrough is about -50dBc. Note that these depend on the
mixer balance and circuit layout, as well as the quadrature coupler
design and construction.
Also shown is an active filter/amplifier that brings the 10MHz output
back up near 1Vrms and lowers the 30MHz harmonic to ~ -60dBc and the
5MHz feedthrough to ~ -65dBc. If a simple series LC is used to feed
the load, H3 and 5MHz feedthrough can be reduced further to ~ -80dBc.
Bandpass filters at the output frequency can create phase modulation
with temperature changes. Accordingly, they are presumptively
disfavored. However, I built the whole circuit into a smallish cast
aluminum box, which integrates any external temperature changes with
a long time constant (tens of minutes), and have never had any
problem in this regard.
For many applications there is no need for any filtering (other than
a simple LP noise filter) after the mixer. Because the even-order
output products are very well suppressed, the output waveform is
nearly perfectly symmetrical. This means that it has a 50% duty
cycle and maintains its 50% duty cycle when it is AC coupled or
DC-restored, so triggering can always be stable at the center point
of the waveform.
This inherent freedom from spurious outputs and suppression of
even-order output harmonics makes the circuit attractive wherever low
spurious output is desired, compared to diode doublers or active
push-push circuits. For any required suppression of spurs, the DBM
doubler needs less aggressive filtering because of its inherent
balance. It also avoids the flicker noise that is characteristic of
diode, BJT, and FET doublers.
Of course, any design is an exercise in compromise and meeting
required performance goals, and there are always many means to reach
the end, so different designers will choose different paths. This is
one I happen to like. If you try it, you may find that you do, too.
Note: The circuit works without the emitter follower buffers, but
the spurious outputs are somewhat higher due to the nonlinear loading
on the hybrid coupler. This may still be useful if an all-passive
circuit is required.
Best regards,
Charles