Undamped meter, just for fun.

[amdx]

I was measuring the internal resistance of a D'arsovnal meter.
When I connected my PS, the meter started oscillating, I quickly
disconnected my PS and checked it, it seemed fine.
I reconnected the PS, and just let it oscillate until it stopped.
So I made a video 28V, 400k ohm series resistor and the meter,
The spec's, 55 ohms internal resistance and 124uA FS.
No big deal, just never saw a meter swing so much. Yes, I went high
series resistance to maximize the oscillation. No, I don't have a
parallel resistor to dampen it.

https://www.youtube.com/watch?v=1IsH6S2TK7w

Mikek

 

[Jan Panteltje]

On a sunny day (Sun, 11 Aug 2019 12:47:22 -0500) it happened amdx
<nojunk@knology.net> wrote in <qipkbb$5fv$1@dont-email.me>:

I was measuring the internal resistance of a D'arsovnal meter.
When I connected my PS, the meter started oscillating, I quickly
disconnected my PS and checked it, it seemed fine.
I reconnected the PS, and just let it oscillate until it stopped.
So I made a video 28V, 400k ohm series resistor and the meter,
The spec's, 55 ohms internal resistance and 124uA FS.
No big deal, just never saw a meter swing so much. Yes, I went high
series resistance to maximize the oscillation. No, I don't have a
parallel resistor to dampen it.

https://www.youtube.com/watch?v=1IsH6S2TK7w

Yes is bad, buy a better meter?

 

[Rick C]

On Sunday, August 11, 2019 at 1:47:28 PM UTC-4, amdx wrote:

I was measuring the internal resistance of a D'arsovnal meter.
When I connected my PS, the meter started oscillating, I quickly
disconnected my PS and checked it, it seemed fine.
I reconnected the PS, and just let it oscillate until it stopped.
So I made a video 28V, 400k ohm series resistor and the meter,
The spec's, 55 ohms internal resistance and 124uA FS.
No big deal, just never saw a meter swing so much. Yes, I went high
series resistance to maximize the oscillation. No, I don't have a
parallel resistor to dampen it.

https://www.youtube.com/watch?v=1IsH6S2TK7w

You didn't wait for it to stop completely.

lol

--

Rick C.

- Get 1,000 miles of free Supercharging
- Tesla referral code - https://ts.la/richard11209

 

[amdx]

On 8/11/2019 1:06 PM, Jan Panteltje wrote:

On a sunny day (Sun, 11 Aug 2019 12:47:22 -0500) it happened amdx
nojunk@knology.net> wrote in <qipkbb$5fv$1@dont-email.me>:

I was measuring the internal resistance of a D'arsovnal meter.
When I connected my PS, the meter started oscillating, I quickly
disconnected my PS and checked it, it seemed fine.
I reconnected the PS, and just let it oscillate until it stopped.
So I made a video 28V, 400k ohm series resistor and the meter,
The spec's, 55 ohms internal resistance and 124uA FS.
No big deal, just never saw a meter swing so much. Yes, I went high
series resistance to maximize the oscillation. No, I don't have a
parallel resistor to dampen it.

https://www.youtube.com/watch?v=1IsH6S2TK7w

Yes is bad, buy a better meter?

Better than a 66 year old Simpson meter?

I can't tell if you are being sarcastic or factious or serious.
But the meter is fine, it is driven by a thermocouple, it has two
22 ohm resistors in series with it.
See Thermocouple and Multiply Q By meter here.
> https://www.dropbox.com/s/z11gl9sed40b5o7/boonton%20q%20voltages.jpg?dl=0

Mikek

To add to my fun, I thought I could replace the meter with a 55 ohm
resistor and measure the voltage across the resistor with a Digital
voltmeter. But when I did that,
the digital voltmeter didn't change reading like the analog meter, if I
dropped the drive by 1/2, the digital meter just stayed at the old
reading, or might very slowly drift down, strange to me.

 

[amdx]

On 8/11/2019 2:00 PM, Rick C wrote:

On Sunday, August 11, 2019 at 1:47:28 PM UTC-4, amdx wrote:
I was measuring the internal resistance of a D'arsovnal meter.
When I connected my PS, the meter started oscillating, I quickly
disconnected my PS and checked it, it seemed fine.
I reconnected the PS, and just let it oscillate until it stopped.
So I made a video 28V, 400k ohm series resistor and the meter,
The spec's, 55 ohms internal resistance and 124uA FS.
No big deal, just never saw a meter swing so much. Yes, I went high
series resistance to maximize the oscillation. No, I don't have a
parallel resistor to dampen it.

https://www.youtube.com/watch?v=1IsH6S2TK7w

You didn't wait for it to stop completely.

lol

I had leave to get a video some paint drying!

Mikek

 

[Jan Panteltje]

On a sunny day (Sun, 11 Aug 2019 16:00:30 -0500) it happened amdx
<nojunk@knology.net> wrote in <qipvle$7ej$1@dont-email.me>:

On 8/11/2019 1:06 PM, Jan Panteltje wrote:
On a sunny day (Sun, 11 Aug 2019 12:47:22 -0500) it happened amdx
nojunk@knology.net> wrote in <qipkbb$5fv$1@dont-email.me>:

I was measuring the internal resistance of a D'arsovnal meter.
When I connected my PS, the meter started oscillating, I quickly
disconnected my PS and checked it, it seemed fine.
I reconnected the PS, and just let it oscillate until it stopped.
So I made a video 28V, 400k ohm series resistor and the meter,
The spec's, 55 ohms internal resistance and 124uA FS.
No big deal, just never saw a meter swing so much. Yes, I went high
series resistance to maximize the oscillation. No, I don't have a
parallel resistor to dampen it.

https://www.youtube.com/watch?v=1IsH6S2TK7w

Yes is bad, buy a better meter?


Better than a 66 year old Simpson meter?

You mention a 124 uA moving coil meter as far as I can tell.

I had and have meters like that; 100 uA full scale, bigger than yours
and those do not wiggle, I used one for years as a kid as my multimeter
with series resistors.
Maybe if yours is normally shunted by a thermocouple they thought it would not be needed to add a damping system.
You do so many strange experiments, from Q of crystal receivers (look up super-heterodyne to get a break)
that your posting is to me just an other shot into deep space difficult to see the context.
If I had a meter like that it would go into the garbage right away, not even decent scale, to much junk already.
You can, with just a few opamps and some wire make your own very nice accurate thermocouple meters
write some software, log it, use it to control things etc:
http://panteltje.com/panteltje/pic/th_pic/

For most multi meters you can buy a thermocouple probe too, and those do not wiggle either.

This is my opinion and it is a free world still .

 

On Monday, 12 August 2019 06:44:20 UTC+1, Jan Panteltje wrote:

On a sunny day (Sun, 11 Aug 2019 16:00:30 -0500) it happened amdx
nojunk@knology.net> wrote in <qipvle$7ej$1@dont-email.me>:

On 8/11/2019 1:06 PM, Jan Panteltje wrote:
On a sunny day (Sun, 11 Aug 2019 12:47:22 -0500) it happened amdx
nojunk@knology.net> wrote in <qipkbb$5fv$1@dont-email.me>:

I was measuring the internal resistance of a D'arsovnal meter.
When I connected my PS, the meter started oscillating, I quickly
disconnected my PS and checked it, it seemed fine.
I reconnected the PS, and just let it oscillate until it stopped.
So I made a video 28V, 400k ohm series resistor and the meter,
The spec's, 55 ohms internal resistance and 124uA FS.
No big deal, just never saw a meter swing so much. Yes, I went high
series resistance to maximize the oscillation. No, I don't have a
parallel resistor to dampen it.

https://www.youtube.com/watch?v=1IsH6S2TK7w

Yes is bad, buy a better meter?


Better than a 66 year old Simpson meter?

You mention a 124 uA moving coil meter as far as I can tell.

I had and have meters like that; 100 uA full scale, bigger than yours
and those do not wiggle, I used one for years as a kid as my multimeter
with series resistors.
Maybe if yours is normally shunted by a thermocouple they thought it would not be needed to add a damping system.
You do so many strange experiments, from Q of crystal receivers (look up super-heterodyne to get a break)
that your posting is to me just an other shot into deep space difficult to see the context.
If I had a meter like that it would go into the garbage right away, not even decent scale, to much junk already.
You can, with just a few opamps and some wire make your own very nice accurate thermocouple meters
write some software, log it, use it to control things etc:
http://panteltje.com/panteltje/pic/th_pic/

For most multi meters you can buy a thermocouple probe too, and those do not wiggle either.

This is my opinion and it is a free world still .

Meters like that were typically damped with a vane, giving a little air resistance. Maybe the vane has fallen off. Like that they're only useful for slow moving values.


NT

 

[Jan Panteltje]

On a sunny day (Mon, 12 Aug 2019 04:05:05 -0700 (PDT)) it happened
tabbypurr@gmail.com wrote in
<a42d7da2-ec02-4f8a-950f-8f7333e9c2bd@googlegroups.com>:

On Monday, 12 August 2019 06:44:20 UTC+1, Jan Panteltje wrote:
On a sunny day (Sun, 11 Aug 2019 16:00:30 -0500) it happened amdx
nojunk@knology.net> wrote in <qipvle$7ej$1@dont-email.me>:

On 8/11/2019 1:06 PM, Jan Panteltje wrote:
On a sunny day (Sun, 11 Aug 2019 12:47:22 -0500) it happened amdx
nojunk@knology.net> wrote in <qipkbb$5fv$1@dont-email.me>:

I was measuring the internal resistance of a D'arsovnal meter.
When I connected my PS, the meter started oscillating, I quickly
disconnected my PS and checked it, it seemed fine.
I reconnected the PS, and just let it oscillate until it stopped.
So I made a video 28V, 400k ohm series resistor and the meter,
The spec's, 55 ohms internal resistance and 124uA FS.
No big deal, just never saw a meter swing so much. Yes, I went high
series resistance to maximize the oscillation. No, I don't have a
parallel resistor to dampen it.

https://www.youtube.com/watch?v=1IsH6S2TK7w

Yes is bad, buy a better meter?


Better than a 66 year old Simpson meter?

You mention a 124 uA moving coil meter as far as I can tell.

I had and have meters like that; 100 uA full scale, bigger than yours
and those do not wiggle, I used one for years as a kid as my multimeter
with series resistors.
Maybe if yours is normally shunted by a thermocouple they thought it would not be needed to add a damping system.
You do so many strange experiments, from Q of crystal receivers (look up super-heterodyne to get a break)
that your posting is to me just an other shot into deep space difficult to see the context.
If I had a meter like that it would go into the garbage right away, not even decent scale, to much junk already.
You can, with just a few opamps and some wire make your own very nice accurate thermocouple meters
write some software, log it, use it to control things etc:
http://panteltje.com/panteltje/pic/th_pic/

For most multi meters you can buy a thermocouple probe too, and those do not wiggle either.

This is my opinion and it is a free world still .

Meters like that were typically damped with a vane, giving a little air resistance. Maybe the vane has fallen off. Like that
they're only useful for slow moving values.

Yes, and if it is directly connected to a low impedance thermocouple
then it will be damped by that (behave like a shorted DC magnet motor).
So that saves them the cost of a vane, ??

 

On Monday, August 12, 2019 at 11:30:46 AM UTC-5, Rick C wrote:

On Monday, August 12, 2019 at 11:53:01 AM UTC-4, John Larkin wrote:
On Sun, 11 Aug 2019 12:47:22 -0500, amdx <nojunk@knology.net> wrote:

I was measuring the internal resistance of a D'arsovnal meter.
When I connected my PS, the meter started oscillating, I quickly
disconnected my PS and checked it, it seemed fine.
I reconnected the PS, and just let it oscillate until it stopped.
So I made a video 28V, 400k ohm series resistor and the meter,
The spec's, 55 ohms internal resistance and 124uA FS.
No big deal, just never saw a meter swing so much. Yes, I went high
series resistance to maximize the oscillation. No, I don't have a
parallel resistor to dampen it.

https://www.youtube.com/watch?v=1IsH6S2TK7w


Mikek





Is there an optimal resistor source impedance for best damping?

Yes, of course. It's called critical damping. I would expect you to know about this since there is an analog in filter design.

--

Rick C.

+ Get 1,000 miles of free Supercharging
+ Tesla referral code - https://ts.la/richard11209

I suspect he did, maybe some Socratic teaching.

 

[Rick C]

On Monday, August 12, 2019 at 11:53:01 AM UTC-4, John Larkin wrote:

On Sun, 11 Aug 2019 12:47:22 -0500, amdx <nojunk@knology.net> wrote:

I was measuring the internal resistance of a D'arsovnal meter.
When I connected my PS, the meter started oscillating, I quickly
disconnected my PS and checked it, it seemed fine.
I reconnected the PS, and just let it oscillate until it stopped.
So I made a video 28V, 400k ohm series resistor and the meter,
The spec's, 55 ohms internal resistance and 124uA FS.
No big deal, just never saw a meter swing so much. Yes, I went high
series resistance to maximize the oscillation. No, I don't have a
parallel resistor to dampen it.

https://www.youtube.com/watch?v=1IsH6S2TK7w


Mikek





Is there an optimal resistor source impedance for best damping?

Yes, of course. It's called critical damping. I would expect you to know about this since there is an analog in filter design.

--

Rick C.

+ Get 1,000 miles of free Supercharging
+ Tesla referral code - https://ts.la/richard11209

 

[amdx]

On 8/12/2019 10:48 AM, amdx wrote:

On 8/12/2019 12:44 AM, Jan Panteltje wrote:
On a sunny day (Sun, 11 Aug 2019 16:00:30 -0500) it happened amdx
nojunk@knology.net> wrote in <qipvle$7ej$1@dont-email.me>:

On 8/11/2019 1:06 PM, Jan Panteltje wrote:
On a sunny day (Sun, 11 Aug 2019 12:47:22 -0500) it happened amdx
nojunk@knology.net> wrote in <qipkbb$5fv$1@dont-email.me>:

I was measuring the internal resistance of a D'arsovnal meter.
When I connected my PS, the meter started oscillating, I quickly
disconnected my PS and checked it, it seemed fine.
   I reconnected the PS, and just let it oscillate until it stopped.
   So I made a video 28V, 400k ohm series resistor and the meter,
The spec's,  55 ohms internal resistance and 124uA FS.
No big deal, just never saw a meter swing so much. Yes, I went high
series resistance to maximize the oscillation. No, I don't have a
parallel resistor to dampen it.

https://www.youtube.com/watch?v=1IsH6S2TK7w

Yes is bad, buy a better meter?


  Better than a 66 year old Simpson meter?

You mention a 124 uA moving coil meter as far as I can tell.

I had and have meters like that; 100 uA full scale, bigger than yours
and those do not wiggle, I used one for years as a kid as my multimeter
with series resistors.
Maybe if yours is normally shunted by a thermocouple they thought it
would not be needed to add a damping system.
You do so many strange experiments, from Q of crystal receivers (look
up super-heterodyne to get a break)

 I'll make you a deal, you start producing readable/useable schematics
then I will look into super-heterodyne receivers. Or we can just do what
we want to do and enjoy or not, each others posts.

that your posting is to me just an other shot into deep space
difficult to see the context.
If I had a meter like that it would go into the garbage right away,
not even decent scale, to much junk already.

Th meter is fine works exactly a it should. In circuit it is very slow
to respond, because of the thermocouple, when you make a current
adjustment you have to wait for the meter to catch up. The scale is
marked as it should be for it's purpose, I assume the thermocouple is
non-linear and the meter is scaled to reflect that.
 As to throwing it in the garbage, no, I just reinstalled it into the
instrument. Works great.


You can, with just a few opamps and some wire make your own very nice
accurate thermocouple meters
write some software, log it, use it to control things etc:
  http://panteltje.com/panteltje/pic/th_pic/

 The new series of Q meters did away with the thermocouple and couple
through a 2pf cap to a FET high input impedance amp. They also started
use something called a transistor, no more tubes!


For most multi meters you can buy a thermocouple probe too, and those
do not wiggle either.

This is my opinion and it is a free world still .


Most of it, hope we can keep our part of it that way.
                              Mikek

I might add, before I look at super-heterodyne receivers, I have this
on my agenda.
> https://forums.qrz.com/index.php?threads/feedback-on-building-a-bog-antenna.669192/

Mikek

 

[amdx]

On 8/12/2019 10:52 AM, John Larkin wrote:

On Sun, 11 Aug 2019 12:47:22 -0500, amdx <nojunk@knology.net> wrote:

I was measuring the internal resistance of a D'arsovnal meter.
When I connected my PS, the meter started oscillating, I quickly
disconnected my PS and checked it, it seemed fine.
I reconnected the PS, and just let it oscillate until it stopped.
So I made a video 28V, 400k ohm series resistor and the meter,
The spec's, 55 ohms internal resistance and 124uA FS.
No big deal, just never saw a meter swing so much. Yes, I went high
series resistance to maximize the oscillation. No, I don't have a
parallel resistor to dampen it.

https://www.youtube.com/watch?v=1IsH6S2TK7w


Mikek





Is there an optimal resistor source impedance for best damping?

It's back together now, so the only thing I can add is, when I
paralleled the 55 ohm meter with a 55 ohm resistor the meter did not
drop by half.
It read higher than that. I can't find the info, but I think a
thermocouple has a very low output impedance, much less than an ohm?
The series circuit is thermocouple, 40 ohm resistor, 55 ohm meter.
So that is the dampening, About 40 ohms.

Mikek

See circuit here, R204 and R204 are each 20 ohms, hand picked per unit.

> https://www.dropbox.com/s/z11gl9sed40b5o7/Boonton%20Q%20Voltages.jpg?dl=0

 

[John Larkin]

On Sun, 11 Aug 2019 12:47:22 -0500, amdx <nojunk@knology.net> wrote:

I was measuring the internal resistance of a D'arsovnal meter.
When I connected my PS, the meter started oscillating, I quickly
disconnected my PS and checked it, it seemed fine.
I reconnected the PS, and just let it oscillate until it stopped.
So I made a video 28V, 400k ohm series resistor and the meter,
The spec's, 55 ohms internal resistance and 124uA FS.
No big deal, just never saw a meter swing so much. Yes, I went high
series resistance to maximize the oscillation. No, I don't have a
parallel resistor to dampen it.

https://www.youtube.com/watch?v=1IsH6S2TK7w


Mikek

Is there an optimal resistor source impedance for best damping?



--

John Larkin Highland Technology, Inc trk

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

 

[amdx]

On 8/12/2019 12:44 AM, Jan Panteltje wrote:

On a sunny day (Sun, 11 Aug 2019 16:00:30 -0500) it happened amdx
nojunk@knology.net> wrote in <qipvle$7ej$1@dont-email.me>:

On 8/11/2019 1:06 PM, Jan Panteltje wrote:
On a sunny day (Sun, 11 Aug 2019 12:47:22 -0500) it happened amdx
nojunk@knology.net> wrote in <qipkbb$5fv$1@dont-email.me>:

I was measuring the internal resistance of a D'arsovnal meter.
When I connected my PS, the meter started oscillating, I quickly
disconnected my PS and checked it, it seemed fine.
I reconnected the PS, and just let it oscillate until it stopped.
So I made a video 28V, 400k ohm series resistor and the meter,
The spec's, 55 ohms internal resistance and 124uA FS.
No big deal, just never saw a meter swing so much. Yes, I went high
series resistance to maximize the oscillation. No, I don't have a
parallel resistor to dampen it.

https://www.youtube.com/watch?v=1IsH6S2TK7w

Yes is bad, buy a better meter?


Better than a 66 year old Simpson meter?

You mention a 124 uA moving coil meter as far as I can tell.

I had and have meters like that; 100 uA full scale, bigger than yours
and those do not wiggle, I used one for years as a kid as my multimeter
with series resistors.
Maybe if yours is normally shunted by a thermocouple they thought it would not be needed to add a damping system.
You do so many strange experiments, from Q of crystal receivers (look up super-heterodyne to get a break)

I'll make you a deal, you start producing readable/useable schematics
then I will look into super-heterodyne receivers. Or we can just do what
we want to do and enjoy or not, each others posts.

that your posting is to me just an other shot into deep space difficult to see the context.
If I had a meter like that it would go into the garbage right away, not even decent scale, to much junk already.

Th meter is fine works exactly a it should. In circuit it is very slow
to respond, because of the thermocouple, when you make a current
adjustment you have to wait for the meter to catch up. The scale is
marked as it should be for it's purpose, I assume the thermocouple is
non-linear and the meter is scaled to reflect that.
As to throwing it in the garbage, no, I just reinstalled it into the
instrument. Works great.

You can, with just a few opamps and some wire make your own very nice accurate thermocouple meters
write some software, log it, use it to control things etc:
http://panteltje.com/panteltje/pic/th_pic/

The new series of Q meters did away with the thermocouple and couple
through a 2pf cap to a FET high input impedance amp. They also started
use something called a transistor, no more tubes!

For most multi meters you can buy a thermocouple probe too, and those do not wiggle either.

This is my opinion and it is a free world still .

Most of it, hope we can keep our part of it that way.
Mikek

 

[Rick C]

On Monday, August 12, 2019 at 1:31:01 PM UTC-4, John Larkin wrote:

On Mon, 12 Aug 2019 09:35:46 -0700 (PDT), amdx62@gmail.com wrote:

On Monday, August 12, 2019 at 11:30:46 AM UTC-5, Rick C wrote:
On Monday, August 12, 2019 at 11:53:01 AM UTC-4, John Larkin wrote:
On Sun, 11 Aug 2019 12:47:22 -0500, amdx <nojunk@knology.net> wrote:

I was measuring the internal resistance of a D'arsovnal meter.
When I connected my PS, the meter started oscillating, I quickly
disconnected my PS and checked it, it seemed fine.
I reconnected the PS, and just let it oscillate until it stopped.
So I made a video 28V, 400k ohm series resistor and the meter,
The spec's, 55 ohms internal resistance and 124uA FS.
No big deal, just never saw a meter swing so much. Yes, I went high
series resistance to maximize the oscillation. No, I don't have a
parallel resistor to dampen it.

https://www.youtube.com/watch?v=1IsH6S2TK7w


Mikek





Is there an optimal resistor source impedance for best damping?

Yes, of course. It's called critical damping. I would expect you to know about this since there is an analog in filter design.

--

Rick C.

+ Get 1,000 miles of free Supercharging
+ Tesla referral code - https://ts.la/richard11209

I suspect he did, maybe some Socratic teaching.

The question was sincere.

Naming something "critical damping" is not the answer.

I suppose it's even possible that the optimum damping resistor could
be negative.

It's certainly enough for anyone to find the "answer" with Google. It doesn't even require the construction of a super-computer. How about "42", is that better?

https://lmgtfy.com/?q=critical+damping

Jeeze, talk about lazy!

--

Rick C.

-- Get 1,000 miles of free Supercharging
-- Tesla referral code - https://ts.la/richard11209

 

[John Larkin]

On Mon, 12 Aug 2019 09:35:46 -0700 (PDT), amdx62@gmail.com wrote:

On Monday, August 12, 2019 at 11:30:46 AM UTC-5, Rick C wrote:
On Monday, August 12, 2019 at 11:53:01 AM UTC-4, John Larkin wrote:
On Sun, 11 Aug 2019 12:47:22 -0500, amdx <nojunk@knology.net> wrote:

I was measuring the internal resistance of a D'arsovnal meter.
When I connected my PS, the meter started oscillating, I quickly
disconnected my PS and checked it, it seemed fine.
I reconnected the PS, and just let it oscillate until it stopped.
So I made a video 28V, 400k ohm series resistor and the meter,
The spec's, 55 ohms internal resistance and 124uA FS.
No big deal, just never saw a meter swing so much. Yes, I went high
series resistance to maximize the oscillation. No, I don't have a
parallel resistor to dampen it.

https://www.youtube.com/watch?v=1IsH6S2TK7w


Mikek





Is there an optimal resistor source impedance for best damping?

Yes, of course. It's called critical damping. I would expect you to know about this since there is an analog in filter design.

--

Rick C.

+ Get 1,000 miles of free Supercharging
+ Tesla referral code - https://ts.la/richard11209

I suspect he did, maybe some Socratic teaching.

The question was sincere.

Naming something "critical damping" is not the answer.

I suppose it's even possible that the optimum damping resistor could
be negative.


--

John Larkin Highland Technology, Inc trk

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

 

[amdx]

On 8/12/2019 12:07 PM, Jan Panteltje wrote:

On a sunny day (Mon, 12 Aug 2019 11:24:40 -0500) it happened amdx
nojunk@knology.net> wrote in <qis3s6$gm5$1@dont-email.me>:

I might add, before I look at super-heterodyne receivers, I have this
on my agenda.
https://forums.qrz.com/index.php?threads/feedback-on-building-a-bog-antenna.669192/

Mikek

I do not make deals,

That's OK, it wasn't expected, it was more of a I'm pulling your leg,
type line.

I don't know what it is that you posted. Is it a glorified Firestick?
Is it an over the air tuner and recorder? Is it a combination of both?


The BOG is an antenna for AM BCB, 160M, 80M, and 40M radio signals.
It takes up 260 linear ft x 1/16 inch and several square inches at
each end!
Mikek



but I have a small DVB-T antenna and a bought new DVB-T2 tuner

as the system here moved to DVB-T2:
https://www.ebay.com/itm/173920120323
gets several channels in HD

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Bit rate : 3 502 Kbps
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16/9
Frame rate mode : Constant
Frame rate : 50.000 fps
Bits/(Pixel*Frame) : 0.034
Stream size : 83.3 MiB (96%)

Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format version : Version 4
Format profile : LC
Format settings, SBR : No
Codec ID : 40
Duration : 3mn 19s
Bit rate mode : Constant
Bit rate : 129 Kbps
Channel(s) : 2 channels
Channel positions : L R
Sampling rate : 48.0 KHz
Resolution : 16 bits
Stream size : 3.08 MiB (4%)
Language : Dutch


Not bad for 23$90 free shipping
Strongly recommended, can set timers too, works on mains and also on 5V.

So what can you receive on your 'bog' antenna and how much space does that take and what does it cost including the receiver?
This is 2019

Satellite dishes are even better.
Sat boxes are just as cheap.

Do not hang in the past, it no longer exists,

 

[Jan Panteltje]

On a sunny day (Mon, 12 Aug 2019 11:24:40 -0500) it happened amdx
<nojunk@knology.net> wrote in <qis3s6$gm5$1@dont-email.me>:

I might add, before I look at super-heterodyne receivers, I have this
on my agenda.
https://forums.qrz.com/index.php?threads/feedback-on-building-a-bog-antenna.669192/

Mikek

I do not make deals, but I have a small DVB-T antenna and a bought new DVB-T2 tuner
as the system here moved to DVB-T2:
https://www.ebay.com/itm/173920120323
gets several channels in HD

General
Complete name : tv_noord_ffmpeg_vcodec_copy.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom
File size : 86.6 MiB
Duration : 3mn 19s
Overall bit rate : 3 638 Kbps
Writing application : Lavf57.56.101

Video
ID : 1
Format : hev1
Codec ID : hev1
Duration : 3mn 19s
Bit rate mode : Variable
Bit rate : 3 502 Kbps
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16/9
Frame rate mode : Constant
Frame rate : 50.000 fps
Bits/(Pixel*Frame) : 0.034
Stream size : 83.3 MiB (96%)

Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format version : Version 4
Format profile : LC
Format settings, SBR : No
Codec ID : 40
Duration : 3mn 19s
Bit rate mode : Constant
Bit rate : 129 Kbps
Channel(s) : 2 channels
Channel positions : L R
Sampling rate : 48.0 KHz
Resolution : 16 bits
Stream size : 3.08 MiB (4%)
Language : Dutch


Not bad for 23$90 free shipping
Strongly recommended, can set timers too, works on mains and also on 5V.

So what can you receive on your 'bog' antenna and how much space does that take and what does it cost including the receiver?
This is 2019

Satellite dishes are even better.
Sat boxes are just as cheap.

Do not hang in the past, it no longer exists,

 

[Steve Wilson]

John Larkin <jjlarkin@highlandtechnology.com> wrote:

On Sun, 11 Aug 2019 12:47:22 -0500, amdx <nojunk@knology.net> wrote:

I was measuring the internal resistance of a D'arsovnal meter.
When I connected my PS, the meter started oscillating, I quickly
disconnected my PS and checked it, it seemed fine.
I reconnected the PS, and just let it oscillate until it stopped.
So I made a video 28V, 400k ohm series resistor and the meter,
The spec's, 55 ohms internal resistance and 124uA FS.
No big deal, just never saw a meter swing so much. Yes, I went high
series resistance to maximize the oscillation. No, I don't have a
parallel resistor to dampen it.

https://www.youtube.com/watch?v=1IsH6S2TK7w


Mikek

> Is there an optimal resistor source impedance for best damping?

Yes.

https://nvlpubs.nist.gov/nistpubs/bulletin/13/nbsbulletinv13n2p211_A2b.pdf

For voltmeters, the resistance goes in parallel with the movement.

 

[amdx]

On 8/12/2019 12:30 PM, John Larkin wrote:

On Mon, 12 Aug 2019 09:35:46 -0700 (PDT), amdx62@gmail.com wrote:

On Monday, August 12, 2019 at 11:30:46 AM UTC-5, Rick C wrote:
On Monday, August 12, 2019 at 11:53:01 AM UTC-4, John Larkin wrote:
On Sun, 11 Aug 2019 12:47:22 -0500, amdx <nojunk@knology.net> wrote:

I was measuring the internal resistance of a D'arsovnal meter.
When I connected my PS, the meter started oscillating, I quickly
disconnected my PS and checked it, it seemed fine.
I reconnected the PS, and just let it oscillate until it stopped.
So I made a video 28V, 400k ohm series resistor and the meter,
The spec's, 55 ohms internal resistance and 124uA FS.
No big deal, just never saw a meter swing so much. Yes, I went high
series resistance to maximize the oscillation. No, I don't have a
parallel resistor to dampen it.

https://www.youtube.com/watch?v=1IsH6S2TK7w


Mikek





Is there an optimal resistor source impedance for best damping?

Yes, of course. It's called critical damping. I would expect you to know about this since there is an analog in filter design.

--

Rick C.

+ Get 1,000 miles of free Supercharging
+ Tesla referral code - https://ts.la/richard11209

I suspect he did, maybe some Socratic teaching.

The question was sincere.

Naming something "critical damping" is not the answer.

I suppose it's even possible that the optimum damping resistor could
be negative.


Here's how the meter dampening looks in circuit.
https://www.youtube.com/watch?v=1pyVURg61yg&feature=youtu.be

Mikek