Level 1 Charger Plug...

[micky]

In alt.home.repair, on Sat, 24 Jul 2021 10:21:07 -0400, Ralph Mowery
<rmowery42@charter.net> wrote:

In article <q76ofg9e48u9nb1k4kpouknn7vdpr704ba@4ax.com>, NONONOmisc07
@fmguy.com says...

And for decades, one car radio after another, (maybe the Buick,) Chryler
and Toyota, would get WAMU, 88.5FM, (American University in DC),
perfectly, when only one inside radio would get it. Even now a much
different Toyota radio gets WAMU usually perfectly, when the one inside
radio no longer does as well. (For a while I was reporting to the WAMU
engineer when reception was good or bad, and he got it good, but months
later, it got weak again sometimes. (And like I say, that\'s the one
radio that gets it at all.)


One other thing about the radio in the house is that some homes have so
much metal in them , especially the aluminum siding and foil reflecting
insulation that the radio signals have a hard time getting in to the
house.

I have T1-11 siding, not alumininum As to foil clad insulation, I
don\'t think so. I\'ve been in the walls a little bit when I put a
floodlight in the outside bedroom wall. House built in \'79, not cheap
but not the most expensive either. Plus there is a 6-foot wide window
facing DC from the bedroom, where many of the radios have been, with
aluminum window frames but the frames are not very big.

 

[micky]

In alt.home.repair, on Sat, 24 Jul 2021 10:26:38 -0400, Ralph Mowery
<rmowery42@charter.net> wrote:

In article <q76ofg9e48u9nb1k4kpouknn7vdpr704ba@4ax.com>, NONONOmisc07
@fmguy.com says...

The urls people have posted here (before electronics.repair was added)
make clear that the ground plane in the car makes a difference, and that
cars without one need a special antenna cable, but a) they\'re mostly
pushed for CB radios, b) it\'s not at all clear that the special antenna
is as good c) when shopping for an antenna, any with ground plane
provision probably make note of it, but those without do not, afaik,
warn people what is missing.



For AM radios in cars, the ground plane effect is almost nill. There is
some capacitance coupling from the frame to the gound, but that plays
very little in the AM band. The FM antennas are often built in the
windshelds and the metal of the car does not com into play there either
to ammount to anything.

Only one car had the antenna in the windshield. A long time ago, I
can\'t remember which.

To be much of a ground plane at the AM band you would need a plate of
around 100 feet, 200 feet would be better. Just look at how tall the AM
transmitter antennas are. Those antennas have about 120 wires as long
as the antenna is tall burried in the ground.

So what can I do to get reception inside as good as what I get in the
car? Especially FM. In the past year, reception for WAMU, 88.5 and
C-Span, 90.1, seems to have gone downhill.

 

[Jeff Liebermann]

On Sat, 24 Jul 2021 10:06:23 -0400, micky <NONONOmisc07@fmguy.com>
wrote:

The urls people have posted here (before electronics.repair was added)
make clear that the ground plane in the car makes a difference, and that
cars without one need a special antenna cable, but a) they\'re mostly
pushed for CB radios, b) it\'s not at all clear that the special antenna
is as good c) when shopping for an antenna, any with ground plane
provision probably make note of it, but those without do not, afaik,
warn people what is missing.

I beg to differ. Nobody seems to have mentioned the bane of all MF
(medium frequency) reception, RF noise. A metal ground plane (car
body) does a tolerable job of isolating the AM antenna from the noise
generating ignition, black boxes, and gizmos. With a plastic body,
the antenna will pickup more noise from the engine.

The typical car antenna is sometimes located as far away from the
noisy engine as possible and connected to the AM receiver with RG-62/u
93 ohm low-capacitance coaxial cable. There is an adjustable
capacitor between the antenna and the receiver input capacitance to
resonate the antenna system. The coax cable capacitance and the
receiver input capacitance act as a voltage divider. The more coax
cable capacitance to ground, the less signal and noise arrive at the
receiver. Choose your coax cable type and length carefully.

You can have a really sensitive AM receiver, and still not be able to
hear much. The threshold of sensitivity is atmospheric and man-made
noise.
<https://en.wikipedia.org/wiki/Atmospheric_noise>
Note the graph. At 1MHz, the RF noise (mostly from thunderstorms) is
huge.
<https://map.blitzortung.org/#3.91/39.62/-91.39>
RF noise from neon signs, motors, sparking of any kind, etc just makes
it worse. If you simply build a bigger antenna, or add an RF
amplifier, you increase both the desired signal and the noise
proportionally. If a receiver and antenna produce some SNR (signal to
noise ratio), and I add more antenna gain, or more RF amplification,
the resultant SNR will be the same. In other words, a bigger antenna
or a \"signal booster\" don\'t buy you anything. The trick is to somehow
improve the SNR, which is not easy. See various articles on the
PA0RDT mini-whip antenna for clues:
<https://www.google.com/search?q=pa0rdt+mini+whip>

Car AM radios tend to have the minimum sensitivity and RF front end
gain needed to function in a strong signal environment. They\'re not
made for digging signals out of the noise. That\'s NOT because AM car
radios are made to be inexpensive. It\'s because the receiver is
sitting next to a very noisy car engine. Were it designed to be as
sensitive as an LF or HF receiver, all you would hear is engine noise.
Try it. Build yourself a BCB (broadcast band) RF amplifier and attach
it to your car radio antenna input. In most cases, you\'ll hear your
engine, pump motors, and atmospherics quite well, but the distant AM
stations will still be buried under the noise.

I don\'t have any suggestions to improve your mobile AM reception.
Well, maybe the obvious suggestion to do what you can to eliminate,
move, shield, or isolate sources of RF noise. If weak AM signals
magically appear when you turn off the engine, the source of the noise
is obvious. The problem is that you might do a wonderful job of noise
reduction on your car, such as buy a diesel, but that does nothing if
you\'re stuck in traffic and surrounded by other noisy vehicles. Notice
that the ultimate noise generator, the all electric car, usually does
not come with an AM radio. For example, Tesla will sell you an
optional overpriced infotainment package that includes AM:
<https://electrek.co/2020/10/28/tesla-brings-back-radio-infotainment-retrofit/>

Vendors used to sell rubber grounding straps, that discharge any
static buildup on the car body. That should get rid of some noise.
However, I believe carbon doped car tires have largely eliminated the
need for those straps.

So, to answer your question, yes a plastic body gives lousy AM
reception if your engine belches lots of RF noise and your receiver is
reasonably sensitive. If your receiver is stone deaf, it doesn\'t
matter.

Good luck.

--
Jeff Liebermann jeffl@cruzio.com
PO Box 272 http://www.LearnByDestroying.com
Ben Lomond CA 95005-0272
Skype: JeffLiebermann AE6KS 831-336-2558

 

[Ralph Mowery]

In article <lebofg5ovck64gg67ed1kmdvb0va3cug2n@4ax.com>, NONONOmisc07
@fmguy.com says...

So what can I do to get reception inside as good as what I get in the
car? Especially FM. In the past year, reception for WAMU, 88.5 and
C-Span, 90.1, seems to have gone downhill.

For in the house put up an outside antenna and feed it with coax cable.

 

[Ralph Mowery]

In article <lebofg5ovck64gg67ed1kmdvb0va3cug2n@4ax.com>, NONONOmisc07
@fmguy.com says...

So what can I do to get reception inside as good as what I get in the
car? Especially FM. In the past year, reception for WAMU, 88.5 and
C-Span, 90.1, seems to have gone downhill.

For in the house put up an outside antenna and feed it with coax cable.

 

[rbowman]

On 07/23/2021 10:13 PM, Michael Trew wrote:

On 7/23/2021 8:47 PM, micky wrote:
Actually, it\'s that car radios have always given me better reception
than house radios have. Is it the antenna, the ground plane? What?

Typically better reception in the car, yes, but that all depends on the
antenna set up. You can have a very good antenna at home, but one with
a fault in a car. I\'ve owned both. I\'d like to build an AM loop in my
attic to get better AM reception at some point.

I am very into AM radio, especially long-distance AM stations at night.
I\'ve owned cars where they seem to put no thought into the AM radio
band, and it shows (sounds). Dad had a Chevy Trailblazer (2006?) where
you could always hear the transmission or something interfering with the
AM reception.

http://socalradiowaves.com/columns/am_antenna.html

I built a variation of this theme and it worked well. At the time I was
living about 20 miles from the Mexican border and the highly directional
nature of loop antennas let me null out the Mexican power houses.

This is a simpler version that doesn\'t require building a frame:

https://ccrane.com/How-To-Make-a-Simple-Powerful-AM-Loop-Antenna-For-Free/

http://earmark.net/gesr/loop/

That one is more technical. I didn\'t look through all the links but onr
method was to use ribbon cable. When you solder the ends you offset the
conductors and solder them to the one next to it so you\'re forming one
long conductor.

 

[rbowman]

On 07/24/2021 08:26 AM, Ralph Mowery wrote:

In article <q76ofg9e48u9nb1k4kpouknn7vdpr704ba@4ax.com>, NONONOmisc07
@fmguy.com says...

The urls people have posted here (before electronics.repair was added)
make clear that the ground plane in the car makes a difference, and that
cars without one need a special antenna cable, but a) they\'re mostly
pushed for CB radios, b) it\'s not at all clear that the special antenna
is as good c) when shopping for an antenna, any with ground plane
provision probably make note of it, but those without do not, afaik,
warn people what is missing.



For AM radios in cars, the ground plane effect is almost nill. There is
some capacitance coupling from the frame to the gound, but that plays
very little in the AM band. The FM antennas are often built in the
windshelds and the metal of the car does not com into play there either
to ammount to anything.

To be much of a ground plane at the AM band you would need a plate of
around 100 feet, 200 feet would be better. Just look at how tall the AM
transmitter antennas are. Those antennas have about 120 wires as long
as the antenna is tall burried in the ground.

And for the best outcome, build in a swamp.

 

[Peter W.]

Mpffff....

Car radios are optimized for cars. Cars are tiny, noisy, poorly laid out devices operating in a noisy environment where the primary expectation is good reception. So, the radio designers ignore such niceties as S/N ratios, separation, bandwidth, and so forth for capture. As such, a car radio will receive reliably under conditions that would have a home tuner in full-mute. And were you to take that car tuner and connect it to your home system - assuming the system is reasonably good - you would be horrified at the results.

Horses for courses.

Peter Wieck
Melrose Park, PA

 

[Peeler]

On Sat, 24 Jul 2021 11:11:42 -0600, lowbrowwoman, the endlessly driveling,
troll-feeding, senile idiot, blabbered again:


> And for the best outcome, build in a swamp.

You just HAVE to open your endlessly driveling gob! LOL

 

[Peeler]

On Sat, 24 Jul 2021 11:09:02 -0600, lowbrowwoman, the endlessly driveling,
troll-feeding, senile idiot, blabbered again:


> I built a variation of this theme.

\"A variation of this theme\", eh, you ridiculous verbose bigmouth? LMAO

 

[Rod Speed]

rbowman <bowman@montana.com> wrote

Ralph Mowery wrote
NONONOmisc07@fmguy.com wrote

The urls people have posted here (before electronics.repair was added)
make clear that the ground plane in the car makes a difference, and that
cars without one need a special antenna cable, but a) they\'re mostly
pushed for CB radios, b) it\'s not at all clear that the special antenna
is as good c) when shopping for an antenna, any with ground plane
provision probably make note of it, but those without do not, afaik,
warn people what is missing.

For AM radios in cars, the ground plane effect is almost nill. There is
some capacitance coupling from the frame to the gound, but that plays
very little in the AM band. The FM antennas are often built in the
windshelds and the metal of the car does not com into play there either
to ammount to anything.

To be much of a ground plane at the AM band you would need a plate of
around 100 feet, 200 feet would be better. Just look at how tall the AM
transmitter antennas are. Those antennas have about 120 wires as long
as the antenna is tall burried in the ground.

And for the best outcome, build in a swamp.

But that’s for the transmitter, it isn\'t the best way to do an AM receiver.

 

[Rod Speed]

rbowman <bowman@montana.com> wrote

Ralph Mowery wrote
NONONOmisc07@fmguy.com wrote

The urls people have posted here (before electronics.repair was added)
make clear that the ground plane in the car makes a difference, and that
cars without one need a special antenna cable, but a) they\'re mostly
pushed for CB radios, b) it\'s not at all clear that the special antenna
is as good c) when shopping for an antenna, any with ground plane
provision probably make note of it, but those without do not, afaik,
warn people what is missing.

For AM radios in cars, the ground plane effect is almost nill. There is
some capacitance coupling from the frame to the gound, but that plays
very little in the AM band. The FM antennas are often built in the
windshelds and the metal of the car does not com into play there either
to ammount to anything.

To be much of a ground plane at the AM band you would need a plate of
around 100 feet, 200 feet would be better. Just look at how tall the AM
transmitter antennas are. Those antennas have about 120 wires as long
as the antenna is tall burried in the ground.

And for the best outcome, build in a swamp.

But that’s for the transmitter, it isn\'t the best way to do an AM receiver.

 

[Max D.]

On Tuesday, May 4, 2021 at 10:45:44 AM UTC-4, Peter W. wrote:

On Thursday, June 12, 2008 at 11:51:40 PM UTC-4, Wilton Itamoto wrote:
I am currently working on a Panasonic microwave oven model NN-S762WF. I need
the part# for Q702 on the inverter board. The transistor is burnt and I
cannot read the number on the case. Unfortunately I do not have another
inverter board on hand and Panasonic does not provide the schematic.
Anyone replaced one of these or know the part number?
There is always this - if you can find a data-sheet.

https://alltransistors.com/mosfet/

Peter Wieck
Melrose Park, PA

I just ordered a pulled 1M30D-060 from Dalbani which is based in FL. I\'ve checked around and they appear to be a reliable source that has been around for ages. They\'re not fake proof but, apparently, when a problem occur, they\'re quick to dispatch a replacement.

 

[Max D.]

On Tuesday, May 4, 2021 at 10:45:44 AM UTC-4, Peter W. wrote:

On Thursday, June 12, 2008 at 11:51:40 PM UTC-4, Wilton Itamoto wrote:
I am currently working on a Panasonic microwave oven model NN-S762WF. I need
the part# for Q702 on the inverter board. The transistor is burnt and I
cannot read the number on the case. Unfortunately I do not have another
inverter board on hand and Panasonic does not provide the schematic.
Anyone replaced one of these or know the part number?
There is always this - if you can find a data-sheet.

https://alltransistors.com/mosfet/

Peter Wieck
Melrose Park, PA

I just ordered a pulled 1M30D-060 from Dalbani which is based in FL. I\'ve checked around and they appear to be a reliable source that has been around for ages. They\'re not fake proof but, apparently, when a problem occur, they\'re quick to dispatch a replacement.

 

[Peeler]

On Sun, 25 Jul 2021 05:46:25 +1000, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again:

<FLUSH the trolling senile asshole\'s latest trollshit unread>

--
Xeno to trolling senile Rodent:
\"You\'re a sad old man Rod, truly sad.\"
MID: <id04c3F50peU1@mid.individual.net>

 

[bruce bowser]

On Saturday, July 24, 2021 at 10:21:11 AM UTC-4, Ralph Mowery wrote:

In article <q76ofg9e48u9nb1k4...@4ax.com>, NONONOmisc07
@fmguy.com says...

And for decades, one car radio after another, (maybe the Buick,) Chryler
and Toyota, would get WAMU, 88.5FM, (American University in DC),
perfectly, when only one inside radio would get it. Even now a much
different Toyota radio gets WAMU usually perfectly, when the one inside
radio no longer does as well. (For a while I was reporting to the WAMU
engineer when reception was good or bad, and he got it good, but months
later, it got weak again sometimes. (And like I say, that\'s the one
radio that gets it at all.)

One other thing about the radio in the house is that some homes have so
much metal in them , especially the aluminum siding and foil reflecting
insulation that the radio signals have a hard time getting in to the
house.

That\'s odd. If you go to the NASA space museums, you see that the early 1970\'s satellites have all of this gold and copper looking foil around the satellite\'s lower regions. I thought that helped with transceiver communications.

 

[Peter W.]

> That\'s odd. If you go to the NASA space museums, you see that the early 1970\'s satellites have all of this gold and copper looking foil around the satellite\'s lower regions. I thought that helped with transceiver communications.

Heat.

Peter Wieck
Melrose Park, PA

 

[Peter W.]

> That\'s odd. If you go to the NASA space museums, you see that the early 1970\'s satellites have all of this gold and copper looking foil around the satellite\'s lower regions. I thought that helped with transceiver communications.

Heat.

Peter Wieck
Melrose Park, PA

 

[Phil Allison]

rbowman wrote:
==============

http://socalradiowaves.com/columns/am_antenna.html

I built a variation of this theme and it worked well.

--------------------------------------------------------------
** LOL

I have been using a 5 turn frame antenna *just* like that since the late 70s !!

My * tube AM tuner* has a transformer balanced input for use with a loop.
Like the Carver TX-11b, it also has 15kHz audio bandwidth and low THD at 95% mod plus a switchable, sharp notch at 9kHz.

But the maker ( here in Sydney) did not suggest using a frame antenna in the handbook, nor had one been tried when I asked.
His method was to run a fixed, single turn loop around a window.

The frame is better as you can orient it to maximise the signal or null an unwanted one.

... Phil

 

[Max D.]

On Thursday, June 26, 2008 at 5:27:36 PM UTC-4, Franc Zabkar wrote:

On Thu, 26 Jun 2008 21:43:13 +1000, Franc Zabkar
fza...@iinternode.on.net> put finger to keyboard and composed:
Q701
*GT60N321 (G60N90
AESCGT60N321
Toshiba GT60N321, 1000V 60A N-channel IGBT:
http://www.toshiba.com/taec/components/Datasheet/GT60N321.pdf
Q702
1M30D-060
AESPGT30J322
Toshiba GT30J322, 600V 30A N-channel IGBT:
http://www.datasheetcatalog.org/datasheet/toshiba/1549.pdf
- Franc Zabkar
--
Please remove one \'i\' from my address when replying by email.

I\'m currently working on a Panasonic NN-C994S Convection Oven, and the converter has a blown mosfet # 1M30D-060. The inverter model is A606Y4T00AP.
Will any 1M30D-060 do the job?

Regards