Driver to drive?

[amdx]

On 3/16/2017 6:25 PM, Phil Allison wrote:

John Larkin wrote:



** The latter is exactly what a ferrite antenna is optimised for.


In the early days of transistor radios, size was limited and gain was
expensive, so it was worth some ferrite to get more RF input power.
Gain is now so cheap that an air core antenna might be OK.


** Really ?

Try posting an idea that is not full of ambiguities.


Maybe I should have used shorter words?


** Express you idea clearly

which I did


** Another deliberate lie.


or fuck off.

You and what army?


** Larkin must be either drunk or on drugs today.

Wot an obnoxious, fucking shithead.



..... Phil

Now that's funny!
Mikek

---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

 

[Jeff Liebermann]

On Sat, 18 Mar 2017 18:39:00 -0700 (PDT), pcdhobbs@gmail.com wrote:

Siemens BB112
http://pdf1.alldatasheet.com/datasheet-pdf/view/44230/SIEMENS/BB112/+3_342UOGDL.OudGhtNz+/datasheet.pdf

Toshiba 1SV149
http://pdf1.alldatasheet.com/datasheet-pdf/view/29858/TOSHIBA/1SV149/+QJJ59UPLRhpDDdAXbNwH+/datasheet.pdf

Yeah, I know they used to exist. I still have some
MVAM109s in my drawer. I was asking about current
production though.
Cheers
Phil "BB209 fan" Hobbs

BB209 is still available on eBay from Greece and UK:
<http://www.ebay.com/sch/i.html?_nkw=bb209+diode>
Also BB221:
<http://www.ebay.com/sch/i.html?_nkw=bb221+diode>

Here's an article showing various hints:
<http://www.zl2pd.com/Varicaps.html>
The author mentions Zetex, On-Semi, and Toko KV1500 series. Might as
well follow his lead.

I found some which looks like an equivalents:
<http://pdf1.alldatasheet.com/datasheet-pdf/view/29571/TOKO/KV1590NT/+QJWJ3UPLpxalX-vEBub+/datasheet.pdf>
<http://pdf1.alldatasheet.com/datasheet-pdf/view/29570/TOKO/KV1560NT/+QJWJ2UPLpxalX-vCBub+/datasheet.pdf>
<http://pdf1.alldatasheet.com/datasheet-pdf/view/29569/TOKO/KV1555NT/+QJW7-UPLpxalX-vzCub+/datasheet.pdf>
No clue if they are available or still in production. Probably not as
that part numbers are not listed on any of the Murata/Toko parts
distributors.

Digikey lists On-Semi/Motorola/Sanyo SVC838T-TL-E as obsolete. The
device has an amazing capacitance ratio of 24.5.
<http://media.digikey.com/pdf/Data%20Sheets/Sanyo%20Energy/SVC383.pdf>

Digikey's parts search for varicaps with a capacitance ratio >= 14.7
yields 122 candidates:
<http://www.digikey.com/products/en/discrete-semiconductor-products/diodes-variable-capacitance-varicaps-varactors/282?k=&pkeyword=&pv792=46&pv792=42&pv792=40&pv792=6&pv792=41&pv792=88&pv792=44&pv792=47&pv792=87&pv792=58&FV=ffe0011a%2Cc60001d%2Cc600028%2Cc600029%2Cc60002a%2Cc60002c%2Cc60002e%2Cc60002f%2Cc600005%2Cc60003a%2Cc600006%2Cc60004d%2Cc60004f%2Cc600050%2Cc600054%2Cc600057%2Cc600058%2Cc600062>
All seem to be single varicaps, no duals. Varicaps from NXP and
Infineon are listed as obsolete.

Skyworks looks promising:
<http://www.skyworksinc.com/Category/49/Varactor_Diodes>
The problem is that they have so many diodes listed that I can't find
an equivalent. Also, no dual diodes. Filtering by what's in stock at
Digikey, and with a cap ratio >=14.7, I get these three devices:
<https://www.digikey.com/products/en/discrete-semiconductor-products/diodes-variable-capacitance-varicaps-varactors/282?k=&pkeyword=&pv1989=0&FV=fffc0507%2Cfffc1f97%2Cfffc035f%2Cffe0011a%2Cc60002c%2Cc60002e%2Cc600006%2Cc600058>
The problem is that all of these seem to be made for VHF/UHF. The
closest approximation is:
<http://www.skyworksinc.com/uploads/documents/SMV1801_079LF_200915F.pdf>
with a cap ratio = 20 and tuning range of about 3pf to 60pf. A few of
these in parallel might work in the AM BCB (broadcast band).

Zetex (Diodes Inc) shows no varicap or varactor diodes listed on their
web pile:
<https://www.diodes.com/products/discrete/diodes-and-rectifiers/diodes/>

Ok, I give up for now.

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

 

[Lasse Langwadt Christense]

Den søndag den 19. marts 2017 kl. 23.21.48 UTC+1 skrev rickman:

On 3/19/2017 5:36 PM, John Robertson wrote:
On 2017/03/18 8:50 PM, rickman wrote:
On 3/18/2017 9:34 PM, tabbypurr@gmail.com wrote:
On Sunday, 19 March 2017 00:51:19 UTC, rickman wrote:


I'm not sure it is very
relevant that someone could be found innocent after spending 20
years in
prison if that is such a heinous punishment.

Why don't you ask the people released after 20 years whether it's
relevant.

Know any?

The point is that it is *very* few individuals. We carelessly kill more
people in highway accidents every day than we mistakenly kill death row
inmates in a decade. I would bet that motor vehicle deaths due to
governmental errors, like the sharp curve sign that points the wrong
way, are more common than innocent convicts being killed. It just
doesn't get the same press.

Then there are the convicts killed while in prison because we
can't/don't provide adequate security. How egregious is it for a person
who was never even sentenced to death being killed because of simply
being in prison?

Yes, it is terrible that an innocent person is convicted and put to
death. But in reality it is no different from being run over by a truck
with failed brakes or being shot unintentionally by criminals or police
during a shootout or dying from the wrong treatment in a hospital or
many, many other ways of dying. Not saying we shouldn't do all we can.
I'm just saying it isn't the biggest problem we have.

you are basically arguing that involuntary manslaughter and premeditated
murder is the same thing?

 

[bitrex]

On 03/16/2017 12:40 PM, bill.sloman@ieee.org wrote:

On Friday, March 17, 2017 at 1:29:43 AM UTC+11, Tom Del Rosso wrote:
Jim Thompson wrote:
"Procedure" tomorrow (Wednesday) at 11:00AM:

Down the throat with a scope, check out the stomach, then into the
small intestine, use side-looking ultrasound on the end of the probe
(didn't know such a thing existed)

Sure, they found the Titanic with something similar.

Not exactly. Jim may be overweight, but he isn't large enough to accommodate a towed side-looking sonar array. Diagnostic sonar is all near-field array stuff, and the Titanic was found with an array that looked at the far-field.

snip

Is common knowledge where the big T is located now? I recall her precise
location was a closely-guarded secret for some time.

 

[Julian Barnes]

On Sun, 19 Mar 2017 15:31:30 -0700, Lasse Langwadt Christensen wrote:

you are basically arguing that involuntary manslaughter and premeditated
murder is the same thing?

dude,ignore the prickman troll he talks out of his ass.

 

[Cursitor Doom]

On Sun, 19 Mar 2017 20:03:54 +0000, Kevin Aylward wrote:

As I noted, we have differences in moral compasses and definitions of
what is a civilised society.

Indeed. Irreconcilable differences I suspect. ;->

 

[Kevin Aylward]

>"Cursitor Doom" wrote in message newsamf4t$oce$17@dont-email.me...

On Sun, 19 Mar 2017 15:51:55 +0000, Kevin Aylward wrote:

I guess you missed the other bits about being on a par to the thumbs
up/thump down at the roman gladiator

No I didn't, Kev. How the hell is the whim of one emperor comparable to
the evidentially-based reasoning of 12 impartial individuals under the
guidance of a senior judge well-versed in dealing with murder cases??

Again, you compliantly missed my point and the ethics of the situation. Its
absolutely nothing to do with whether there is a valid determination of
guilt. I should have been clearer, I am referring to the jury (federal)
deciding whether or not to have the actor killed as "punishment".

I will repeat, as it seems necessary to explain what the actual issue is,
although I find this somewhat stunning. The issue should be very clear.


12 people calmly and coldly sit on seats debating the merits of killing
someone over several days, with a state sponsored judge coldly and
calculating exposing all sorts of "rational" arguments as to how it is
ethically justifiable to execute said person being debated. Said person is
then dragged to a room with gawking onlookers watching the deliberate
injection of chemicals to terminate said life.


Its about that there is no ethical difference between a group of thugs
debating the merits of killing the women they have just just kidnapped, and
the above.

Many will argue that because in one case the person being debated has killed
someone, and the other has not, that there is a relevant ethical difference
between the two cases. I don't.

As I noted, we have differences in moral compasses and definitions of what
is a civilised society.

-- Kevin Aylward
http://www.anasoft.co.uk - SuperSpice
http://www.kevinaylward.co.uk/ee/index.html

 

[Phil Allison]

amdx wrote:

All ferrite has losses and usually the higher you go in frequency the
more lossy it becomes.
Here's a test I did yesterday, I put a rod in the center of a 6" dia.
coil. I reduced turns to get approx. the same inductance.

Best Ferrite Poorer ferrite
236uh 232uh 216uh
33 turn 30 turn 30 turn
Air core coil Ferrite Coil Ferrite Coil

590kHz 59 mv 43 mv 59 mv

1290kHz 15.5 mv 6.7 mv 7.1 mv

1430kHz 10.5 mv 4.2mv 3.2 mv

You can see how the ferrite causes additional losses in the upper
frequencies.

** Again you have built a frame antenna, not too different from what was fitted to many radios prior to the arrival of ferrite rods.

Having a ferrite rod sited in the middle is ineffectual, the reduction in turns is not offset by any benefit.

Is it that hard to do what the OP asked for?

With a 6 inch LONG tube that a 6 inch LONG ferrite rod can neatly fit inside.

It's guaranteed the ferrite version will then win by a large margin.


...... Phil

 

On Monday, March 20, 2017 at 4:33:45 AM UTC+11, Cursitor Doom wrote:

On Sun, 19 Mar 2017 09:08:54 -0700, tabbypurr wrote:

Naivete about the mechanics of 'justice' is not unusual.

You won't find such in me, Tabitha. And I'm the keenest observer of human
nature you will ever encounter.

But one that believes what he reads in the Express.

Cursitor Doom has a rather higher opinion of his own acumen than any rational observer would be happy to support. Julian Barnes might agree with him.

--
Bill Sloman, Sydney

 

[Cursitor Doom]

On Sun, 19 Mar 2017 19:54:06 -0400, krw wrote:

The perp gave up his right to life by taking that of another. End of
story.

Ha! It's *never* the end of the story when you get into an argument with
our Kev. ;-)

 

[John Robertson]

On 2017/03/18 8:50 PM, rickman wrote:

On 3/18/2017 9:34 PM, tabbypurr@gmail.com wrote:
On Sunday, 19 March 2017 00:51:19 UTC, rickman wrote:


I'm not sure it is very
relevant that someone could be found innocent after spending 20 years in
prison if that is such a heinous punishment.

Why don't you ask the people released after 20 years whether it's
relevant.

Know any?

http://www.indystar.com/story/news/crime/2017/01/22/bills-offer-money-indianas-wrongfully-convicted-how-much-enough/96410428/

http://www.insideedition.com/headlines/14111-7-cases-of-men-who-spent-years-behind-bars-for-crimes-they-didnt-commit

http://www.csmonitor.com/USA/Justice/2015/0412/After-39-years-in-prison-an-epic-tale-of-innocence-found-and-bitterness-lost

http://stories.avvo.com/crime/murder/8-people-who-were-executed-and-later-found-innocent.html

http://www.deathpenaltyinfo.org/innocence-cases

http://www.findingdulcinea.com/news/on-this-day/June/Nelson-Mandela-Sentenced-to-Life-in-Prison.html

https://en.wikipedia.org/wiki/Overturned_convictions_in_Canada

The list goes on and on.

John

 

On Sunday, 19 March 2017 17:31:58 UTC, Cursitor Doom wrote:

On Sun, 19 Mar 2017 15:51:55 +0000, Kevin Aylward wrote:

I guess you missed the other bits about being on a par to the thumbs
up/thump down at the roman gladiator

No I didn't, Kev. How the hell is the whim of one emperor comparable to
the evidentially-based reasoning of 12 impartial individuals under the
guidance of a senior judge well-versed in dealing with murder cases??

evidence... there's one problem.
reasoning... there's another problem
judge... there's a 3rd problem.
I find it odd you can't see how those go wrong, but so be it.


NT

 

On Sunday, 19 March 2017 17:33:45 UTC, Cursitor Doom wrote:

On Sun, 19 Mar 2017 09:08:54 -0700, tabbypurr wrote:

Naivete about the mechanics of 'justice' is not unusual.

You won't find such in me, Tabitha. And I'm the keenest observer of human
nature you will ever encounter.

I've watched enough groups of people judging situations to know your position is naive. Courts are in no way immune to a slew of problems.


NT

 

[rickman]

On 3/19/2017 5:36 PM, John Robertson wrote:

On 2017/03/18 8:50 PM, rickman wrote:
On 3/18/2017 9:34 PM, tabbypurr@gmail.com wrote:
On Sunday, 19 March 2017 00:51:19 UTC, rickman wrote:


I'm not sure it is very
relevant that someone could be found innocent after spending 20
years in
prison if that is such a heinous punishment.

Why don't you ask the people released after 20 years whether it's
relevant.

Know any?

The point is that it is *very* few individuals. We carelessly kill more
people in highway accidents every day than we mistakenly kill death row
inmates in a decade. I would bet that motor vehicle deaths due to
governmental errors, like the sharp curve sign that points the wrong
way, are more common than innocent convicts being killed. It just
doesn't get the same press.

Then there are the convicts killed while in prison because we
can't/don't provide adequate security. How egregious is it for a person
who was never even sentenced to death being killed because of simply
being in prison?

Yes, it is terrible that an innocent person is convicted and put to
death. But in reality it is no different from being run over by a truck
with failed brakes or being shot unintentionally by criminals or police
during a shootout or dying from the wrong treatment in a hospital or
many, many other ways of dying. Not saying we shouldn't do all we can.
I'm just saying it isn't the biggest problem we have.

--

Rick C

 

On Sunday, 19 March 2017 23:54:09 UTC, k...@notreal.com wrote:

On Sun, 19 Mar 2017 09:16:29 -0000, "Kevin Aylward"
kevinRemovAT@kevinaylward.co.uk> wrote:
"Kevin Aylward" wrote in message
news:kfudnRgqWLyQIlDFnZ2dnUU7-XvNnZ2d@giganews.com...

"bitrex" wrote in message news:9DdzA.62942$mb5.42260@fx19.iad...


I'm a liberal and yet, in some circumstances I do support the death
penalty.

I don't see that there can be much more of a cold-bloodied, calculated
murder, than having 12 people calmly sit on seats debating the merits of
killing someone over several days, with a state sponsored judge exposing
all sorts of "rational" arguments as to how it is ethically justifiable to
execute said person being debated. Said person is then dragged to a room
with gawking onlookers watching the deliberate injection of chemicals to
terminate said life. This is no less barbaric than at a Roman gladiator ring
where the emperor points his thump up or down.

What is even more grotesque, is that large numbers of those barbarians
supporting state sponsored murder are alleged Christians, despite their role
model, Jesus, emphatically instructing them that "thou shall not kill".
More, stunningly the xtians claim that it is they that there the morally
righteous ones.

The perp gave up his right to life by taking that of another. End of
story.

Now there's simplistic.

 

[billbowden]

"amdx" <nojunk@knology.net> wrote in message
newsam0ee$ch5$1@dont-email.me...

On 3/14/2017 11:18 PM, billbowden wrote:
Which is a better design. Suppose you have a 6 inch length of PVC pipe
with
numerous turns of wire that has an inductance of say 200uH. Now suppose
you
use the same (6 inch) piece of PVC with a ferrite rod in the core with
considerably fewer turns of wire. Which one would capture the most
signal
at the AM Broadcast frequencies (500K to 2 Megs) and produce the greatest
signal output? Would it be more ferrite, or more wire?


I'll run the experiment.

Do you want it tuned?

If not, I have no way to measure the signals of my local stations.
I need the resonance peaking to see the signal.

What diameter PVC?

I have 1/2" OD polystyrene that will allow a little closer coupling
between the ferrite and the wire. 400 turns #28 = 203uh air core.

I have 1/2" CPVC. actual OD. 0.615"
290 turns #28 = 200uh air core


I have 1/2 PVC, actual OD. 0.832. 175 turns #28 = 205uh air core.

Pick one.

I'll also wind one with less turns and use my best Q rod that is 8" long x
0.375" diameter.

I will check three frequencies, 590Khz, 1290kHz and 1430Khz.

I made a post last night of the wrong experiment (6"dia not 6" long)
It has not shown up this morning, so I'll repeat my measurement method.

To measure the signal I have a very high input impedance amp with a gain
of 1.
I use the amp to drive a scope (ch 2) set at 50mV/div. I took the channel
2 output from the back of the scope to drive a Boonton 92BD RF millivolt
meter. I use the scope to compare the visual to audio from a portable
radio to know where I am tuned.
Modulation causes a bit of amplitude bounce, but I do a visual average.

Let me know what you want.
Mikek

Actually, I'm just interested in comparing the response of two identical
loopsticks, one using an air core and the other using a ferrite core. I
could do the experiment since there is a 50KW station about 7 miles away and
I can see the signal from the antenna loop directly on a scope. I can get
about 1 volt peak using a loop antenna of about 15 inches square. I just
thought someone would know the answer without a lot of experimenting. I have
a portable car radio with a air core loop antenna mounted on the chassis
that measures 6.5 inch by 3/4 diameter and about 300 turns of small wire.
Works fine and gets stations 130 miles away. But it's a power hog and draws
100mA from a 12 volt battery. I suppose a good test would be to use a
shorter ferrite rod and fewer turns to compare the results. But I'm lazy and
just want to know which idea is better.

 

[rickman]

On 3/19/2017 7:31 PM, billbowden wrote:

"amdx" <nojunk@knology.net> wrote in message
newsam0ee$ch5$1@dont-email.me...
On 3/14/2017 11:18 PM, billbowden wrote:
Which is a better design. Suppose you have a 6 inch length of PVC pipe
with
numerous turns of wire that has an inductance of say 200uH. Now suppose
you
use the same (6 inch) piece of PVC with a ferrite rod in the core with
considerably fewer turns of wire. Which one would capture the most
signal
at the AM Broadcast frequencies (500K to 2 Megs) and produce the greatest
signal output? Would it be more ferrite, or more wire?


I'll run the experiment.

Do you want it tuned?

If not, I have no way to measure the signals of my local stations.
I need the resonance peaking to see the signal.

What diameter PVC?

I have 1/2" OD polystyrene that will allow a little closer coupling
between the ferrite and the wire. 400 turns #28 = 203uh air core.

I have 1/2" CPVC. actual OD. 0.615"
290 turns #28 = 200uh air core


I have 1/2 PVC, actual OD. 0.832. 175 turns #28 = 205uh air core.

Pick one.

I'll also wind one with less turns and use my best Q rod that is 8" long x
0.375" diameter.

I will check three frequencies, 590Khz, 1290kHz and 1430Khz.

I made a post last night of the wrong experiment (6"dia not 6" long)
It has not shown up this morning, so I'll repeat my measurement method.

To measure the signal I have a very high input impedance amp with a gain
of 1.
I use the amp to drive a scope (ch 2) set at 50mV/div. I took the channel
2 output from the back of the scope to drive a Boonton 92BD RF millivolt
meter. I use the scope to compare the visual to audio from a portable
radio to know where I am tuned.
Modulation causes a bit of amplitude bounce, but I do a visual average.

Let me know what you want.
Mikek


Actually, I'm just interested in comparing the response of two identical
loopsticks, one using an air core and the other using a ferrite core. I
could do the experiment since there is a 50KW station about 7 miles away and
I can see the signal from the antenna loop directly on a scope. I can get
about 1 volt peak using a loop antenna of about 15 inches square. I just
thought someone would know the answer without a lot of experimenting. I have
a portable car radio with a air core loop antenna mounted on the chassis
that measures 6.5 inch by 3/4 diameter and about 300 turns of small wire.
Works fine and gets stations 130 miles away. But it's a power hog and draws
100mA from a 12 volt battery. I suppose a good test would be to use a
shorter ferrite rod and fewer turns to compare the results. But I'm lazy and
just want to know which idea is better.

Connecting a scope directly to a loop antenna may cause a loss of Q.
I'm hoping not, as I am building a very high Q antenna that will depend
on a high impedance not sapping it, but it depends on the antenna. The
point is if your measurement saps the Q, then any impact on the Q by the
ferrite will not be noticed.

The equations I used include Q in the formula for received signal
strength. So if the ferrite impacts the Q it won't work as well as
expected by the equations (unless you measure the Q and include that).

--

Rick C

 

On Sun, 19 Mar 2017 14:19:57 -0000 (UTC), Cursitor Doom
<curd@notformail.com> wrote:

On Sat, 18 Mar 2017 20:03:50 -0400, krw wrote:

That's impossible, which is the whole "reasonable" thing.

Nothing whatsoever impossible about it!

Not at all. There is always doubt. It may be an unreasonable doubt
but there is _always_ doubt (what if the Earth was really flat?).
Hence, "beyond reasonable doubt".

 

On Sun, 19 Mar 2017 15:31:30 -0700 (PDT), Lasse Langwadt Christensen
<langwadt@fonz.dk> wrote:

Den sřndag den 19. marts 2017 kl. 23.21.48 UTC+1 skrev rickman:
On 3/19/2017 5:36 PM, John Robertson wrote:
On 2017/03/18 8:50 PM, rickman wrote:
On 3/18/2017 9:34 PM, tabbypurr@gmail.com wrote:
On Sunday, 19 March 2017 00:51:19 UTC, rickman wrote:


I'm not sure it is very
relevant that someone could be found innocent after spending 20
years in
prison if that is such a heinous punishment.

Why don't you ask the people released after 20 years whether it's
relevant.

Know any?

The point is that it is *very* few individuals. We carelessly kill more
people in highway accidents every day than we mistakenly kill death row
inmates in a decade. I would bet that motor vehicle deaths due to
governmental errors, like the sharp curve sign that points the wrong
way, are more common than innocent convicts being killed. It just
doesn't get the same press.

Then there are the convicts killed while in prison because we
can't/don't provide adequate security. How egregious is it for a person
who was never even sentenced to death being killed because of simply
being in prison?

Yes, it is terrible that an innocent person is convicted and put to
death. But in reality it is no different from being run over by a truck
with failed brakes or being shot unintentionally by criminals or police
during a shootout or dying from the wrong treatment in a hospital or
many, many other ways of dying. Not saying we shouldn't do all we can.
I'm just saying it isn't the biggest problem we have.


you are basically arguing that involuntary manslaughter and premeditated
murder is the same thing?

Sure. That's why it's called "moral equivalence". Both Ricky and
ShortRex are adherents to the leftist doctrine of moral equivalency.

 

On Sun, 19 Mar 2017 09:16:29 -0000, "Kevin Aylward"
<kevinRemovAT@kevinaylward.co.uk> wrote:

"Kevin Aylward" wrote in message
news:kfudnRgqWLyQIlDFnZ2dnUU7-XvNnZ2d@giganews.com...

"bitrex" wrote in message news:9DdzA.62942$mb5.42260@fx19.iad...


I'm a liberal and yet, in some circumstances I do support the death
penalty.

I don't see that there can be much more of a cold-bloodied, calculated
murder, than having 12 people calmly sit on seats debating the merits of
killing someone over several days, with a state sponsored judge exposing
all sorts of "rational" arguments as to how it is ethically justifiable to
execute said person being debated. Said person is then dragged to a room
with gawking onlookers watching the deliberate injection of chemicals to
terminate said life. This is no less barbaric than at a Roman gladiator ring
where the emperor points his thump up or down.

What is even more grotesque, is that large numbers of those barbarians
supporting state sponsored murder are alleged Christians, despite their role
model, Jesus, emphatically instructing them that "thou shall not kill".
More, stunningly the xtians claim that it is they that there the morally
righteous ones.

The perp gave up his right to life by taking that of another. End of
story.