Photography is in-part "devolving" into high-end audio-speak, as far as VIDEO is concerned

On 28/06/2019 11:28 PM, Eric Stevens wrote:
On Fri, 28 Jun 2019 14:33:40 +1200, geoff
wrote:

On 28/06/2019 12:12 PM, Eric Stevens wrote:
On Thu, 27 Jun 2019 08:23:23 -0400, Alan Browne
wrote:

On 2019-06-24 23:38, Eric Stevens wrote:
On Mon, 24 Jun 2019 19:36:36 -0400, Ken Hart
wrote:

Often, when AM radio is heard on non-radio devices, there is a loose
connection that acts as a rectifier. With a home audio system, that
loose connection often shows up in the phono input, since there is a lot
of gain on that input. (Please note that I used the word "often" rather
than "always"!)

I am pretty sue that was not the situation in the case I described.
The amplifier was new and had just been built in one of the better
university electronics laboratories.

It's irrelevant. A perfectly built amp turned high enough will
'receive' an AM signal as interference and you will hear it in the right
conditions.

It's nothing but interference.

And the human ear can hear the 550KHz output?



Doh - the interference signal is'detected' in the audio circuitry and
output as audio. You've never heard RF interference before ?

You seem to have missed the bit where I said it had a tuner connected
to the input of the amplifier. It didn't rely on interference.

Yes


It also didn't have a detector circuit as such.


The circuitry can do that quite happily by itself as a side-effect. Try
your finger on the active conductor of a line (or phono !) input. Or
especially a guitar amp input (high impedance) .

geoff

geoff

On 29/06/2019 1:49 AM, Whisky-dave wrote:
On Friday, 28 June 2019 13:58:40 UTC+1, Alan Browne wrote:
On 2019-06-27 20:12, Eric Stevens wrote:
On Thu, 27 Jun 2019 08:23:23 -0400, Alan Browne
wrote:

On 2019-06-24 23:38, Eric Stevens wrote:
On Mon, 24 Jun 2019 19:36:36 -0400, Ken Hart
wrote:

Often, when AM radio is heard on non-radio devices, there is a loose
connection that acts as a rectifier. With a home audio system, that
loose connection often shows up in the phono input, since there is a lot
of gain on that input. (Please note that I used the word "often" rather
than "always"!)

I am pretty sue that was not the situation in the case I described.
The amplifier was new and had just been built in one of the better
university electronics laboratories.

It's irrelevant. A perfectly built amp turned high enough will
'receive' an AM signal as interference and you will hear it in the right
conditions.

It's nothing but interference.

And the human ear can hear the 550KHz output?

Do you understand what AM is?

Yeah it comes as the sun rises, then just before lunchtime PM arrives. :-D



Hate to quibble, but AM starts directly after midnight.

geoff

On 6/28/2019 10:54 PM, geoff wrote:
On 29/06/2019 1:49 AM, Whisky-dave wrote:
On Friday, 28 June 2019 13:58:40 UTC+1, Alan Browne* wrote:
On 2019-06-27 20:12, Eric Stevens wrote:
On Thu, 27 Jun 2019 08:23:23 -0400, Alan Browne
wrote:

On 2019-06-24 23:38, Eric Stevens wrote:
On Mon, 24 Jun 2019 19:36:36 -0400, Ken Hart
wrote:

Often, when AM radio is heard on non-radio devices, there is a loose
connection that acts as a rectifier. With a home audio system, that
loose connection often shows up in the phono input, since there
is a lot
of gain on that input. (Please note that I used the word "often"
rather
than "always"!)

I am pretty sue that was not the situation in the case I described.
The amplifier was new and had just been built in one of the better
university electronics laboratories.

It's irrelevant.* A perfectly built amp turned high enough will
'receive' an AM signal as interference and you will hear it in the
right
conditions.

It's nothing but interference.

And the human ear can hear the 550KHz output?

Do you understand what AM is?

Yeah it comes as the sun rises, then just before lunchtime PM arrives.
:-D



Hate to quibble, but AM starts directly after midnight.

geoff

Hmm, so when is it FM?
~~
Cynic-in-training
--
==
Later...
Ron C
--

On 6/28/2019 10:54 PM, geoff wrote:
On 29/06/2019 1:49 AM, Whisky-dave wrote:
On Friday, 28 June 2019 13:58:40 UTC+1, Alan Browne* wrote:
On 2019-06-27 20:12, Eric Stevens wrote:
On Thu, 27 Jun 2019 08:23:23 -0400, Alan Browne
wrote:

On 2019-06-24 23:38, Eric Stevens wrote:
On Mon, 24 Jun 2019 19:36:36 -0400, Ken Hart
wrote:

Often, when AM radio is heard on non-radio devices, there is a loose
connection that acts as a rectifier. With a home audio system, that
loose connection often shows up in the phono input, since there
is a lot
of gain on that input. (Please note that I used the word "often"
rather
than "always"!)

I am pretty sue that was not the situation in the case I described.
The amplifier was new and had just been built in one of the better
university electronics laboratories.

It's irrelevant.* A perfectly built amp turned high enough will
'receive' an AM signal as interference and you will hear it in the
right
conditions.

It's nothing but interference.

And the human ear can hear the 550KHz output?

Do you understand what AM is?

Yeah it comes as the sun rises, then just before lunchtime PM arrives.
:-D



Hate to quibble, but AM starts directly after midnight.

geoff

Hmm... and the sun is doing what at that time?

--
==
Later...
Ron C
--

On Sat, 29 Jun 2019 14:53:49 +1200, geoff
wrote:

On 28/06/2019 11:28 PM, Eric Stevens wrote:
On Fri, 28 Jun 2019 14:33:40 +1200, geoff
wrote:

On 28/06/2019 12:12 PM, Eric Stevens wrote:
On Thu, 27 Jun 2019 08:23:23 -0400, Alan Browne
wrote:

On 2019-06-24 23:38, Eric Stevens wrote:
On Mon, 24 Jun 2019 19:36:36 -0400, Ken Hart
wrote:

Often, when AM radio is heard on non-radio devices, there is a loose
connection that acts as a rectifier. With a home audio system, that
loose connection often shows up in the phono input, since there is a lot
of gain on that input. (Please note that I used the word "often" rather
than "always"!)

I am pretty sue that was not the situation in the case I described.
The amplifier was new and had just been built in one of the better
university electronics laboratories.

It's irrelevant. A perfectly built amp turned high enough will
'receive' an AM signal as interference and you will hear it in the right
conditions.

It's nothing but interference.

And the human ear can hear the 550KHz output?



Doh - the interference signal is'detected' in the audio circuitry and
output as audio. You've never heard RF interference before ?

You seem to have missed the bit where I said it had a tuner connected
to the input of the amplifier. It didn't rely on interference.

Yes


It also didn't have a detector circuit as such.


The circuitry can do that quite happily by itself as a side-effect.

That's more or less what I said.

Try
your finger on the active conductor of a line (or phono !) input. Or
especially a guitar amp input (high impedance) .

geoff

geoff
--

Regards,

Eric Stevens

On Fri, 28 Jun 2019 08:58:32 -0400, Alan Browne
wrote:

On 2019-06-27 20:12, Eric Stevens wrote:
On Thu, 27 Jun 2019 08:23:23 -0400, Alan Browne
wrote:

On 2019-06-24 23:38, Eric Stevens wrote:
On Mon, 24 Jun 2019 19:36:36 -0400, Ken Hart
wrote:

Often, when AM radio is heard on non-radio devices, there is a loose
connection that acts as a rectifier. With a home audio system, that
loose connection often shows up in the phono input, since there is a lot
of gain on that input. (Please note that I used the word "often" rather
than "always"!)

I am pretty sue that was not the situation in the case I described.
The amplifier was new and had just been built in one of the better
university electronics laboratories.

It's irrelevant. A perfectly built amp turned high enough will
'receive' an AM signal as interference and you will hear it in the right
conditions.

It's nothing but interference.

And the human ear can hear the 550KHz output?

Do you understand what AM is?

Most certainly.
--

Regards,

Eric Stevens

On 2019-06-29 07:22, Eric Stevens wrote:
On Fri, 28 Jun 2019 08:58:32 -0400, Alan Browne
wrote:

On 2019-06-27 20:12, Eric Stevens wrote:
On Thu, 27 Jun 2019 08:23:23 -0400, Alan Browne
wrote:

On 2019-06-24 23:38, Eric Stevens wrote:
On Mon, 24 Jun 2019 19:36:36 -0400, Ken Hart
wrote:

Often, when AM radio is heard on non-radio devices, there is a loose
connection that acts as a rectifier. With a home audio system, that
loose connection often shows up in the phono input, since there is a lot
of gain on that input. (Please note that I used the word "often" rather
than "always"!)

I am pretty sue that was not the situation in the case I described.
The amplifier was new and had just been built in one of the better [2]---
university electronics laboratories.

It's irrelevant. A perfectly built amp turned high enough will
'receive' an AM signal as interference and you will hear it in the right
conditions.

It's nothing but interference.

And the human ear can hear the 550KHz output? [1] ---

Do you understand what AM is?

Most certainly.

Not according to [1][2] above.

--
"Even with the brain dead, the pig's heart keeps on beating...
sort of like ... pick a Kardashian."
-Anthony Bourdain, Parts Unknown

On Sat, 29 Jun 2019 09:34:00 -0400, Alan Browne
wrote:

On 2019-06-29 07:22, Eric Stevens wrote:
On Fri, 28 Jun 2019 08:58:32 -0400, Alan Browne
wrote:

On 2019-06-27 20:12, Eric Stevens wrote:
On Thu, 27 Jun 2019 08:23:23 -0400, Alan Browne
wrote:

On 2019-06-24 23:38, Eric Stevens wrote:
On Mon, 24 Jun 2019 19:36:36 -0400, Ken Hart
wrote:

Often, when AM radio is heard on non-radio devices, there is a loose
connection that acts as a rectifier. With a home audio system, that
loose connection often shows up in the phono input, since there is a lot
of gain on that input. (Please note that I used the word "often" rather
than "always"!)

I am pretty sue that was not the situation in the case I described.
The amplifier was new and had just been built in one of the better [2]---
university electronics laboratories.

It's irrelevant. A perfectly built amp turned high enough will
'receive' an AM signal as interference and you will hear it in the right
conditions.

It's nothing but interference.

And the human ear can hear the 550KHz output? [1] ---

Do you understand what AM is?

Most certainly.

Not according to [1][2] above.

I'm not sure that I follow your point.
--

Regards,

Eric Stevens

On 29/06/2019 4:07 PM, Ron C wrote:
On 6/28/2019 10:54 PM, geoff wrote:
On 29/06/2019 1:49 AM, Whisky-dave wrote:
On Friday, 28 June 2019 13:58:40 UTC+1, Alan Browne* wrote:
On 2019-06-27 20:12, Eric Stevens wrote:
On Thu, 27 Jun 2019 08:23:23 -0400, Alan Browne
wrote:

On 2019-06-24 23:38, Eric Stevens wrote:
On Mon, 24 Jun 2019 19:36:36 -0400, Ken Hart
wrote:

Often, when AM radio is heard on non-radio devices, there is a
loose
connection that acts as a rectifier. With a home audio system, that
loose connection often shows up in the phono input, since there
is a lot
of gain on that input. (Please note that I used the word "often"
rather
than "always"!)

I am pretty sue that was not the situation in the case I described.
The amplifier was new and had just been built in one of the better
university electronics laboratories.

It's irrelevant.* A perfectly built amp turned high enough will
'receive' an AM signal as interference and you will hear it in the
right
conditions.

It's nothing but interference.

And the human ear can hear the 550KHz output?

Do you understand what AM is?

Yeah it comes as the sun rises, then just before lunchtime PM
arrives. :-D



Hate to quibble, but AM starts directly after midnight.

geoff

Hmm, so when is it FM?
~~
Cynic-in-training

Frequently !

Wit-in-training

geoff

On 29/06/2019 4:11 PM, Ron C wrote:
On 6/28/2019 10:54 PM, geoff wrote:
On 29/06/2019 1:49 AM, Whisky-dave wrote:
On Friday, 28 June 2019 13:58:40 UTC+1, Alan Browne* wrote:
On 2019-06-27 20:12, Eric Stevens wrote:
On Thu, 27 Jun 2019 08:23:23 -0400, Alan Browne
wrote:

On 2019-06-24 23:38, Eric Stevens wrote:
On Mon, 24 Jun 2019 19:36:36 -0400, Ken Hart
wrote:

Often, when AM radio is heard on non-radio devices, there is a
loose
connection that acts as a rectifier. With a home audio system, that
loose connection often shows up in the phono input, since there
is a lot
of gain on that input. (Please note that I used the word "often"
rather
than "always"!)

I am pretty sue that was not the situation in the case I described.
The amplifier was new and had just been built in one of the better
university electronics laboratories.

It's irrelevant.* A perfectly built amp turned high enough will
'receive' an AM signal as interference and you will hear it in the
right
conditions.

It's nothing but interference.

And the human ear can hear the 550KHz output?

Do you understand what AM is?

Yeah it comes as the sun rises, then just before lunchtime PM
arrives. :-D



Hate to quibble, but AM starts directly after midnight.

geoff

Hmm... and the sun is doing what at that time?


What it always does, but on the other side of the meridian.

geoff