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Hello
I ordered an Antuino thinking I would have an SWR meter to help tune a random wire antenna.?
Right now, I don't understand anything about the Antuino.??
The first thing?that puzzles me is an item on the fifth line of the display that is labeled "VTVM" and a number with several decimal places that changes so frequently that the LCD shows a blur with an occasional recognizable digit.? Before I pack it up and return it, I would like to figure out what is going on.
Any ideas?? Is there a URL for an explanation of this?
THanks.
Jim K9JEC
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Jim,
I would have you start with the video on the Antuino page:
It is towards the bottom after the explanation on the menu items.
Based on your description, I will assume that you have the new 2.2 version of the software.? That is similar to the operation of the original 2.1, however, there are two differences:
1 - It will scan the frequencies requested through the Freq and Span settings, with the start being 1/2 of the span before the frequency setting.
2 - A voltmeter was added IF you go in and add the probe to the unused Nano pin.? (I do not use it, so not sure on the details to add it).? I just ignore that part of the screen as I have multiple better instruments to measure voltage.
The controls are slightly different, though not by much.? Instead of PLOT you select and press the encoder on OK to start scanning.
Please read the above page, view the video, and then get back to this group if you have any questions.
73
Evan
AC9TU
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The only explanation of the new functionality is buried in this long video on designing RF feedback amplifiers:
The original video works with the new software, you just need to adjust for the new controls and ignore the VTVM.
And the original description page:
Hope this is clear.
73
Evan
AC9TU
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On Thu, Sep 17, 2020 at 3:10 PM Evan Hand < elhandjr@...> wrote: The only explanation of the new functionality is buried in this long video on designing RF feedback amplifiers:
The original video works with the new software, you just need to adjust for the new controls and ignore the VTVM.
And the original description page:
Hope this is clear.
73
Evan
AC9TU
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Jim,
Here is another video on operation:
73
Evan
AC9TU
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On Thu, Sep 17, 2020 at 3:10 PM Evan Hand < elhandjr@...> wrote: The only explanation of the new functionality is buried in this long video on designing RF feedback amplifiers:
The original video works with the new software, you just need to adjust for the new controls and ignore the VTVM.
And the original description page:
Hope this is clear.
73
Evan
AC9TU
|
Picture, please? 73 KD7TWW
On 09/17/20 12:36 PM, James Carroll via
groups.io wrote:
Hello
I ordered an Antuino thinking I would have an SWR meter to
help tune a random wire antenna.?
Right now, I don't understand anything about the Antuino.??
The first thing?that puzzles me is an item on the fifth
line of the display that is labeled "VTVM" and a number with
several decimal places that changes so frequently that the LCD
shows a blur with an occasional recognizable digit.? Before I
pack it up and return it, I would like to figure out what is
going on.
Any ideas?? Is there a URL for an explanation of this?
THanks.
Jim K9JEC
--
73, de Vince KD7TWW
In what year did the FCC mandate the 1500 Watt PEP limit for amateur radio station
power output? - Motorola Corp was formally named
"Galvin Manufacturing Corporation" (1928¨C1947)
|
The vtvm was a feature that I threw in. On the field one often needs a voltage reading to check on the batteries or fix some loose wires. I had one line available on the Arduino and added this feature. If you don't want it, I can send a new update to turn it off.
On Tue, Aug 17, 2021, 4:54 AM vince adams < vince@...> wrote:
Picture, please? 73 KD7TWW
On 09/17/20 12:36 PM, James Carroll via
wrote:
Hello
I ordered an Antuino thinking I would have an SWR meter to
help tune a random wire antenna.?
Right now, I don't understand anything about the Antuino.??
The first thing?that puzzles me is an item on the fifth
line of the display that is labeled "VTVM" and a number with
several decimal places that changes so frequently that the LCD
shows a blur with an occasional recognizable digit.? Before I
pack it up and return it, I would like to figure out what is
going on.
Any ideas?? Is there a URL for an explanation of this?
THanks.
Jim K9JEC
--
73, de Vince KD7TWW
In what year did the FCC mandate the 1500 Watt PEP limit for amateur radio station
power output? - Motorola Corp was formally named
"Galvin Manufacturing Corporation" (1928¨C1947)
|
Vince, Ashhar didn't say what VTVM stood for - it's Vacuum Tube Volt Meter, we now call them DVMs, for Digital Volt Meters.
Just wanted to explain where the VTVM label came from. Ken, N2VIP
toggle quoted message
Show quoted text
On Aug 16, 2021, at 18:24, vince adams <vince@...> wrote:
?
Picture, please? 73 KD7TWW
On 09/17/20 12:36 PM, James Carroll via
groups.io wrote:
Hello
I ordered an Antuino thinking I would have an SWR meter to
help tune a random wire antenna.?
Right now, I don't understand anything about the Antuino.??
The first thing?that puzzles me is an item on the fifth
line of the display that is labeled "VTVM" and a number with
several decimal places that changes so frequently that the LCD
shows a blur with an occasional recognizable digit.? Before I
pack it up and return it, I would like to figure out what is
going on.
Any ideas?? Is there a URL for an explanation of this?
THanks.
Jim K9JEC
--
73, de Vince KD7TWW
In what year did the FCC mandate the 1500 Watt PEP limit for amateur radio station
power output? - Motorola Corp was formally named
"Galvin Manufacturing Corporation" (1928¨C1947)
|
One more note I didn¡¯t see mentioned. VTVM stands for Vacuum Tube Volt Meter. They worked very well!
Bob-K5KL
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Vince
An un-terminated ADC input will usually show garbage due to noise
pickup.? That input needs an external voltage divider to protect the
input from over-voltage damage.? The input voltage divider will also
help stabilize the input noise situation.
I live very close to your address. We might be able to get together
to discuss the uBITX, Arduino, and Antuino...?? I'm in Meridian
Idaho, on Stonehenge Drive.
Arv? K7HKL
_._
On Mon, Aug 16, 2021 at 5:24 PM vince adams < vince@...> wrote:
Picture, please? 73 KD7TWW
On 09/17/20 12:36 PM, James Carroll via
wrote:
Hello
I ordered an Antuino thinking I would have an SWR meter to
help tune a random wire antenna.?
Right now, I don't understand anything about the Antuino.??
The first thing?that puzzles me is an item on the fifth
line of the display that is labeled "VTVM" and a number with
several decimal places that changes so frequently that the LCD
shows a blur with an occasional recognizable digit.? Before I
pack it up and return it, I would like to figure out what is
going on.
Any ideas?? Is there a URL for an explanation of this?
THanks.
Jim K9JEC
--
73, de Vince KD7TWW
In what year did the FCC mandate the 1500 Watt PEP limit for amateur radio station
power output? - Motorola Corp was formally named
"Galvin Manufacturing Corporation" (1928¨C1947)
|
Hi Bob,
I have some that still do. A statement that suggests a VTVM is a DVM with vacuum tubes is so far off. I have VTVMs AND DVMs. Each has it's place.
73,
Bill KU8H
bark less - wag more
toggle quoted message
Show quoted text
On 8/17/21 12:44 PM, Bob Kremer wrote: One more note I didn¡¯t see mentioned. VTVM stands for Vacuum Tube Volt Meter. They worked very well!
Bob-K5KL
|
It takes a bit of re-engineering but it is possible to replace
the tubes in a VTVM with solid state diodes and MOSFETs. lowering the supply voltage seems to be the most difficult
part of the project.
A slightly different approach might be to use a microprocessor
and a dual ADC.
Arv _._
Hi Bob,
I have some that still do. A statement that suggests a VTVM is a DVM
with vacuum tubes is so far off. I have VTVMs AND DVMs. Each has it's place.
73,
Bill KU8H
bark less - wag more
On 8/17/21 12:44 PM, Bob Kremer wrote:
> One more note I didn¡¯t see mentioned.? VTVM stands for Vacuum Tube Volt Meter.? ?They worked very well!
> Bob-K5KL
>
>
>
>
>
|
Hi,
I have a "solid state VTVM" factory built as you suggest. It has FETs and diodes. Another project I have in mind for a VTVM with an open power transformer is replacement of the vacuum tube triodes with FET input op-amps.
I also have a couple of V-O-Ms here that get used once in a while. No Vacuum tubes. No transistors. No microprocessors. No ICs. No diodes. Just raw Ohm's law and basic, passive parts at their most basic.
73,
Bill KU8H
bark less - wag more
toggle quoted message
Show quoted text
On 8/17/21 7:14 PM, Arv Evans wrote: It takes a bit of re-engineering but it is possible to replace
the tubes in a VTVM with solid state diodes and MOSFETs.
lowering the supply voltage seems to be the most difficult
part of the project.
A slightly different approach might be to use a microprocessor
and a dual ADC.
Arv
_._
On Tue, Aug 17, 2021 at 5:10 PM Bill Cromwell <wrcromwell@... <mailto:wrcromwell@...>> wrote:
Hi Bob,
I have some that still do. A statement that suggests a VTVM is a DVM
with vacuum tubes is so far off. I have VTVMs AND DVMs. Each has
it's place.
73,
Bill KU8H
bark less - wag more
On 8/17/21 12:44 PM, Bob Kremer wrote:
> One more note I didn¡¯t see mentioned.? VTVM stands for Vacuum
Tube Volt Meter.? ?They worked very well!
> Bob-K5KL
>
>
>
>
>
|
Bill
FET input op-amps are a good idea because the gain can be set precisely
in the feedback loop part of things.?? Could turn out to be better than the
original tube design.
Good thinking.
Arv _._
Hi,
I have a "solid state VTVM" factory built as you suggest. It has FETs
and diodes. Another project I have in mind for a VTVM with an open power
transformer is replacement of the vacuum tube triodes with FET input
op-amps.
I also have a couple of V-O-Ms here that get used once in a while. No
Vacuum tubes. No transistors. No microprocessors. No ICs. No diodes.
Just raw Ohm's law and basic, passive parts at their most basic.
73,
Bill KU8H
bark less - wag more
On 8/17/21 7:14 PM, Arv Evans wrote:
> It takes a bit of re-engineering but it is possible to replace
> the tubes in a VTVM with solid state diodes and MOSFETs.
> lowering the supply voltage seems to be the most difficult
> part of the project.
>
> A slightly different approach might be to use a microprocessor
> and a dual ADC.
>
> Arv
> _._
>
>
> On Tue, Aug 17, 2021 at 5:10 PM Bill Cromwell <wrcromwell@...
> <mailto:wrcromwell@...>> wrote:
>
>? ? ?Hi Bob,
>
>? ? ?I have some that still do. A statement that suggests a VTVM is a DVM
>? ? ?with vacuum tubes is so far off. I have VTVMs AND DVMs. Each has
>? ? ?it's place.
>
>? ? ?73,
>
>? ? ?Bill KU8H
>
>? ? ?bark less - wag more
>
>? ? ?On 8/17/21 12:44 PM, Bob Kremer wrote:
>? ? ?> One more note I didn¡¯t see mentioned.? VTVM stands for Vacuum
>? ? ?Tube Volt Meter.? ?They worked very well!
>? ? ?> Bob-K5KL
>? ? ?>
>? ? ?>
>? ? ?>
>? ? ?>
>? ? ?>
>
>
>
>
>
>
|
The vtvm of Antunio is very precise. If someone can take a stab at it, it could well measure the Audio RMS, something that only bench quality Fluke meters do.
Bill
FET input op-amps are a good idea because the gain can be set precisely
in the feedback loop part of things.?? Could turn out to be better than the
original tube design.
Good thinking.
Arv _._
Hi,
I have a "solid state VTVM" factory built as you suggest. It has FETs
and diodes. Another project I have in mind for a VTVM with an open power
transformer is replacement of the vacuum tube triodes with FET input
op-amps.
I also have a couple of V-O-Ms here that get used once in a while. No
Vacuum tubes. No transistors. No microprocessors. No ICs. No diodes.
Just raw Ohm's law and basic, passive parts at their most basic.
73,
Bill KU8H
bark less - wag more
On 8/17/21 7:14 PM, Arv Evans wrote:
> It takes a bit of re-engineering but it is possible to replace
> the tubes in a VTVM with solid state diodes and MOSFETs.
> lowering the supply voltage seems to be the most difficult
> part of the project.
>
> A slightly different approach might be to use a microprocessor
> and a dual ADC.
>
> Arv
> _._
>
>
> On Tue, Aug 17, 2021 at 5:10 PM Bill Cromwell <wrcromwell@...
> <mailto:wrcromwell@...>> wrote:
>
>? ? ?Hi Bob,
>
>? ? ?I have some that still do. A statement that suggests a VTVM is a DVM
>? ? ?with vacuum tubes is so far off. I have VTVMs AND DVMs. Each has
>? ? ?it's place.
>
>? ? ?73,
>
>? ? ?Bill KU8H
>
>? ? ?bark less - wag more
>
>? ? ?On 8/17/21 12:44 PM, Bob Kremer wrote:
>? ? ?> One more note I didn¡¯t see mentioned.? VTVM stands for Vacuum
>? ? ?Tube Volt Meter.? ?They worked very well!
>? ? ?> Bob-K5KL
>? ? ?>
>? ? ?>
>? ? ?>
>? ? ?>
>? ? ?>
>
>
>
>
>
>
|
vince kd7tww