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Discussion Groups | Piclist | COMPLETED: SWR/wattmeter project
A discussion group for the PICMicro microcontroller. Also called the Microchip PIC, this list is dedicated to the use and abuse of this fine, simple, microcontroller. Close to topic posts are welcome, ie. general electronics.
COMPLETED: SWR/wattmeter project - Jason Hsu - May 29 21:19:32 2008
Those of you who are amateur radio operators (like me) would be
particularly interested in my completed project.
Thanks to all of you who helped me out with Assembly language and that
pesky open drain RA4 pin. My microcontroller-based SWR/wattmeter
project is now complete. I have uploaded my source code, pictures,
and report to http://www.jasonhsu.com/swrwatt.html
Jason Hsu, AA0II
------------------------------------
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particularly interested in my completed project.
Thanks to all of you who helped me out with Assembly language and that
pesky open drain RA4 pin. My microcontroller-based SWR/wattmeter
project is now complete. I have uploaded my source code, pictures,
and report to http://www.jasonhsu.com/swrwatt.html
Jason Hsu, AA0II
------------------------------------
to unsubscribe, go to http://www.yahoogroups.com and follow the instructions
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Re: COMPLETED: SWR/wattmeter project - Harold Hallikainen - May 30 11:15:27 2008
> Those of you who are amateur radio operators (like me) would be
> particularly interested in my completed project.
>
> Thanks to all of you who helped me out with Assembly language and that
pesky open drain RA4 pin. My microcontroller-based SWR/wattmeter
project is now complete. I have uploaded my source code, pictures, and
report to http://www.jasonhsu.com/swrwatt.html
>
> Jason Hsu, AA0II
Nice job! A couple comments...
1. A clever idea I saw many years ago for precision rectification of RF
was to use an analog comparator to drive an analog switch. This is used in
the tower current ratio measurement in the Gorman Redlich CMR antenna
monitor (http://www.gorman-redlich.com/cmr2.html). They also run the
comparator outputs through an exclusive OR, then a low pass filter to
measure the phase between the towers. They also run the comparator outputs
into a D latch (one to clock, the other to D) to detect whether the phase
is positive or negative. They make a lot of use of those comparator
outputs!
2. I see that you are measuring the RF voltage and current. Quite a bit
can be done with that data. If you were to either ADC the RF and then do
analysis in software (or hetrodyne down, then ADC the resulting RF and do
analysis in software), or keep the magnitude measurements you currently
have, but also add a phase measurement between the voltage and current,
you can do all sorts of measurements. Besides SWR magnitude, you could get
the complex impedance of the load and the power. The hetrodyne down and
ADC the RF technique is used in the PowerAIM
(http://www.kintronic.com/images/new/PowerAIM.pdf and
http://www.arraysolutions.com/Products/poweraim_120.htm and
http://www.arraysolutions.com/Products/AIM4170B.htm ).
A LOT can be done in the analysis of RF!
Harold
--
FCC Rules Updated Daily at http://www.hallikainen.com - Advertising
opportunities available!
--
FCC Rules Updated Daily at http://www.hallikainen.com - Advertising
opportunities available!
------------------------------------
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Re: COMPLETED: SWR/wattmeter project - Jason Hsu - May 30 23:23:40 2008
But can the analog comparator, analog switch, ADC, etc. really work at
frequencies up to 30 MHz? Are these parts available in through-hole
packages? (I can only solder through-hole.) Are there schematics for
these precision rectification circuits?
--- In p...@yahoogroups.com, "Harold Hallikainen" wrote:
>
> Nice job! A couple comments...
>
> 1. A clever idea I saw many years ago for precision rectification of RF
> was to use an analog comparator to drive an analog switch. This is
used in
> the tower current ratio measurement in the Gorman Redlich CMR antenna
> monitor (http://www.gorman-redlich.com/cmr2.html). They also run the
> comparator outputs through an exclusive OR, then a low pass filter to
> measure the phase between the towers. They also run the comparator
outputs
> into a D latch (one to clock, the other to D) to detect whether the
phase
> is positive or negative. They make a lot of use of those comparator
> outputs!
>
> 2. I see that you are measuring the RF voltage and current. Quite a bit
> can be done with that data. If you were to either ADC the RF and then do
> analysis in software (or hetrodyne down, then ADC the resulting RF
and do
> analysis in software), or keep the magnitude measurements you currently
> have, but also add a phase measurement between the voltage and current,
> you can do all sorts of measurements. Besides SWR magnitude, you
could get
> the complex impedance of the load and the power. The hetrodyne down and
> ADC the RF technique is used in the PowerAIM
> (http://www.kintronic.com/images/new/PowerAIM.pdf and
> http://www.arraysolutions.com/Products/poweraim_120.htm and
> http://www.arraysolutions.com/Products/AIM4170B.htm ).
>
> A LOT can be done in the analysis of RF!
>
> Harold
>
> --
> FCC Rules Updated Daily at http://www.hallikainen.com - Advertising
> opportunities available!
>
> --
> FCC Rules Updated Daily at http://www.hallikainen.com - Advertising
> opportunities available!
>
------------------------------------
to unsubscribe, go to http://www.yahoogroups.com and follow the instructions
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frequencies up to 30 MHz? Are these parts available in through-hole
packages? (I can only solder through-hole.) Are there schematics for
these precision rectification circuits?
--- In p...@yahoogroups.com, "Harold Hallikainen"
>
> Nice job! A couple comments...
>
> 1. A clever idea I saw many years ago for precision rectification of RF
> was to use an analog comparator to drive an analog switch. This is
used in
> the tower current ratio measurement in the Gorman Redlich CMR antenna
> monitor (http://www.gorman-redlich.com/cmr2.html). They also run the
> comparator outputs through an exclusive OR, then a low pass filter to
> measure the phase between the towers. They also run the comparator
outputs
> into a D latch (one to clock, the other to D) to detect whether the
phase
> is positive or negative. They make a lot of use of those comparator
> outputs!
>
> 2. I see that you are measuring the RF voltage and current. Quite a bit
> can be done with that data. If you were to either ADC the RF and then do
> analysis in software (or hetrodyne down, then ADC the resulting RF
and do
> analysis in software), or keep the magnitude measurements you currently
> have, but also add a phase measurement between the voltage and current,
> you can do all sorts of measurements. Besides SWR magnitude, you
could get
> the complex impedance of the load and the power. The hetrodyne down and
> ADC the RF technique is used in the PowerAIM
> (http://www.kintronic.com/images/new/PowerAIM.pdf and
> http://www.arraysolutions.com/Products/poweraim_120.htm and
> http://www.arraysolutions.com/Products/AIM4170B.htm ).
>
> A LOT can be done in the analysis of RF!
>
> Harold
>
> --
> FCC Rules Updated Daily at http://www.hallikainen.com - Advertising
> opportunities available!
>
> --
> FCC Rules Updated Daily at http://www.hallikainen.com - Advertising
> opportunities available!
>
------------------------------------
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Re: Re: COMPLETED: SWR/wattmeter project - Harold Hallikainen - May 31 20:15:49 2008
> But can the analog comparator, analog switch, ADC, etc. really work at
frequencies up to 30 MHz? Are these parts available in through-hole
packages? (I can only solder through-hole.) Are there schematics for
these precision rectification circuits?
I don't know! I last saw the schematic 20 or more years ago. The Gorman
Redlich CMR is rated to 2MHz. Some interesting analysis can be done once
you have a sample of RF voltage and current.
Harold
--
FCC Rules Updated Daily at http://www.hallikainen.com - Advertising
opportunities available!
--
FCC Rules Updated Daily at http://www.hallikainen.com - Advertising
opportunities available!
------------------------------------
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(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Re: COMPLETED: SWR/wattmeter project - Fred Cox - Jun 10 20:09:21 2008
Thanks .
gorobodo after sun book your self. amen :)
regards
2008/5/30 Harold Hallikainen:
>> Those of you who are amateur radio operators (like me) would be
>> particularly interested in my completed project.
>>
>> Thanks to all of you who helped me out with Assembly language and that
> pesky open drain RA4 pin. My microcontroller-based SWR/wattmeter
> project is now complete. I have uploaded my source code, pictures, and
> report to http://www.jasonhsu.com/swrwatt.html
>>
>> Jason Hsu, AA0II
>>
>> Nice job! A couple comments...
>
> 1. A clever idea I saw many years ago for precision rectification of RF
> was to use an analog comparator to drive an analog switch. This is used in
> the tower current ratio measurement in the Gorman Redlich CMR antenna
> monitor (http://www.gorman-redlich.com/cmr2.html). They also run the
> comparator outputs through an exclusive OR, then a low pass filter to
> measure the phase between the towers. They also run the comparator outputs
> into a D latch (one to clock, the other to D) to detect whether the phase
> is positive or negative. They make a lot of use of those comparator
> outputs!
>
> 2. I see that you are measuring the RF voltage and current. Quite a bit
> can be done with that data. If you were to either ADC the RF and then do
> analysis in software (or hetrodyne down, then ADC the resulting RF and do
> analysis in software), or keep the magnitude measurements you currently
> have, but also add a phase measurement between the voltage and current,
> you can do all sorts of measurements. Besides SWR magnitude, you could get
> the complex impedance of the load and the power. The hetrodyne down and
> ADC the RF technique is used in the PowerAIM
> (http://www.kintronic.com/images/new/PowerAIM.pdf and
> http://www.arraysolutions.com/Products/poweraim_120.htm and
> http://www.arraysolutions.com/Products/AIM4170B.htm ).
>
> A LOT can be done in the analysis of RF!
>
> Harold
>
> --
> FCC Rules Updated Daily at http://www.hallikainen.com - Advertising
> opportunities available!
>
> --
> FCC Rules Updated Daily at http://www.hallikainen.com - Advertising
> opportunities available!
>
--
--------------------------------------------------
Fred Cox - f...@safiratec.net
http://www.safiratec.net
--------------------------------------------------
------------------------------------
to unsubscribe, go to http://www.yahoogroups.com and follow the instructions
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
gorobodo after sun book your self. amen :)
regards
2008/5/30 Harold Hallikainen
>> Those of you who are amateur radio operators (like me) would be
>> particularly interested in my completed project.
>>
>> Thanks to all of you who helped me out with Assembly language and that
> pesky open drain RA4 pin. My microcontroller-based SWR/wattmeter
> project is now complete. I have uploaded my source code, pictures, and
> report to http://www.jasonhsu.com/swrwatt.html
>>
>> Jason Hsu, AA0II
>>
>> Nice job! A couple comments...
>
> 1. A clever idea I saw many years ago for precision rectification of RF
> was to use an analog comparator to drive an analog switch. This is used in
> the tower current ratio measurement in the Gorman Redlich CMR antenna
> monitor (http://www.gorman-redlich.com/cmr2.html). They also run the
> comparator outputs through an exclusive OR, then a low pass filter to
> measure the phase between the towers. They also run the comparator outputs
> into a D latch (one to clock, the other to D) to detect whether the phase
> is positive or negative. They make a lot of use of those comparator
> outputs!
>
> 2. I see that you are measuring the RF voltage and current. Quite a bit
> can be done with that data. If you were to either ADC the RF and then do
> analysis in software (or hetrodyne down, then ADC the resulting RF and do
> analysis in software), or keep the magnitude measurements you currently
> have, but also add a phase measurement between the voltage and current,
> you can do all sorts of measurements. Besides SWR magnitude, you could get
> the complex impedance of the load and the power. The hetrodyne down and
> ADC the RF technique is used in the PowerAIM
> (http://www.kintronic.com/images/new/PowerAIM.pdf and
> http://www.arraysolutions.com/Products/poweraim_120.htm and
> http://www.arraysolutions.com/Products/AIM4170B.htm ).
>
> A LOT can be done in the analysis of RF!
>
> Harold
>
> --
> FCC Rules Updated Daily at http://www.hallikainen.com - Advertising
> opportunities available!
>
> --
> FCC Rules Updated Daily at http://www.hallikainen.com - Advertising
> opportunities available!
>
--
--------------------------------------------------
Fred Cox - f...@safiratec.net
http://www.safiratec.net
--------------------------------------------------
------------------------------------
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