Digest for sci.electronics.repair@googlegroups.com - 23 updates in 6 topics

jaugustine@verizon.net: Feb 22 11:08AM -0500

Hi,
 
My Bearcat BC855XLT looses it's memory once in a great
while. Note: I am a service technician.
 
I did NOT find (Google search) a schematic for this scanner.
 
This scanner has a "unique capacitor type memory back-up".
 
I would like to modify this scanner and use a battery back-up because
it is a HASSLE to reprogram the 50 channels.
 
Does anyone know where I can find (willing to buy it) schematic?
 
Or.....
 
Does anyone know where I can find the modification I want to make
to maintain memory?
 
Thank You in advance, John
Jeff Liebermann <jeffl@cruzio.com>: Feb 21 06:03PM -0800


>Last year
 
That would be 2018.
 
>I had several month's
 
Several would be 2 or more months.
 
>of TV interference
>on some channels,
 
Is that OTA TV, cable TV, satellite TV? How many channels do you
normally see on your TV? How many of those channels show
interference? VHF, UHF, or both? Interference is rarely on more than
one channel at a time unless you have a broadband source (6MHz per
channel) that's causing the alleged interference.
 
>mainly pixelation but sometimes
>"no signal".
 
Pixelation can mean many things. Usually, it means a weak signal or
bit loss. Lots of possible culprits.
 
>Worse on some channels.
 
Which channels?
 
>Then, up to now, the interference has stopped, all
>by itself,
 
Are you sure you didn't do anything to make it go away? Antenna
connection? Loose shield on the RG-6/u coax cable? Nearby noise
source got turned off? I once disarmed a "negative ion generator"
that was wiping out OTA TV reception in part of an apartment building.
 
>I live in town opposite a large telecommunications
>building, and here's a picture of it over my back
>fence.....
 
The cellular antennas have a very narrow vertical beamwidth. My
guess(tm) is 11 degrees vertical beamwidth on 850MHz and 6 degrees on
1900MHz. In other words, all the RF is going over your head and not
into your house. However, if you have a rooftop antenna, or live in a
multistory house that puts you into the beam, then maybe the cellular
stuff is causing a problem.
 
 
>Note the plethora of weird aerials on its roof
>which might be causing the interference on my 2006
>Sony wide-screen TV.
 
Ah, you decided to disclose the maker and age of the TV without
bothering to supply a model number. Very good. It's a start. I
don't suppose there might be something wrong with a 13 year TV? The
transition from analog to digital TV started in 1996 and was done in
2009. So, your TV probably has an ATSC tuner. 2006 puts your TV in
the middle of the transition, which makes it difficult for me to guess
the quality of the tuner.
 
Cellular interference to OTA TV is quite real, especially LTE in the
700MHz band. This might offer a few clues:
"Out-of-Band Interference: Myth or Reality?"
<https://www.tvtechnology.com/opinions/outofband-interference-myth-or-reality>
 
>If the interference starts up again what do I do?
 
You walk over to the neighbors and see if they are getting the same
interference on the same channels. If yes, then find the owner of the
nearby antenna farm and unload your frustrations on their public
relations department. If no, and you have an outside antenna, try to
borrow a different TV and compare what you see on the screen. If only
your 2006 Sony has the problem, it might be time to get a better TV.
 
>Are there special filters for this sort of thing,
 
Yes, there are TV bandpass filters. However, few of these will work
with unspecified multiple channels. It might be helpful if you would
insert some numbers in your description. If you are numerically
challenged, just look for an "LTE TV Filter" such as:
<https://www.techhive.com/article/3235649/tv-antenna/lte-filters-for-tv-antennas.html>
<https://www.channelmaster.com/TV_Antenna_LTE_Filter_p/cm-3201.htm>
More:
<https://www.google.com/search?q=lte+tv+filter>
 
>and if not how should I frame a complaint?
 
Try an LTE filter first and see if it helps. Then find whomever owns
the antenna farm and ask them whom to contact. Most large
teleconfusion establishments have a mechanism for handling such
complaints.
 
Good luck.
--
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
Peter Jason <pj@jostle.com>: Feb 22 02:45PM +1100

On Thu, 21 Feb 2019 18:03:25 -0800, Jeff
 
>On Wed, 20 Feb 2019 15:53:14 +1100, Peter Jason <pj@jostle.com> wrote:
 
>>Last year
 
>That would be 2018.
 
Yes.
 
 
>>I had several month's
 
>Several would be 2 or more months.
 
About 4 months
 
 
>interference? VHF, UHF, or both? Interference is rarely on more than
>one channel at a time unless you have a broadband source (6MHz per
>channel) that's causing the alleged interference.
 
OTA? The TV has an aerial with no amplifier, with
a coax cable. The assy is shown here.....
https://postimg.cc/XGG83TfM
The top set have been disconnected because they're
too high to reach, so the TV runs on the bottom
one.
>bit loss. Lots of possible culprits.
 
>>Worse on some channels.
 
>Which channels?
 
All channels, though the lower-freq ones are
worse.
 
>connection? Loose shield on the RG-6/u coax cable? Nearby noise
>source got turned off? I once disarmed a "negative ion generator"
>that was wiping out OTA TV reception in part of an apartment building.
 
No. It all just stopped.
 
>2009. So, your TV probably has an ATSC tuner. 2006 puts your TV in
>the middle of the transition, which makes it difficult for me to guess
>the quality of the tuner.
 
A good point, so next time it happens I'll put it
up into the maid's room, and buy a
newone..especially since these have greater
functionallity for movie formats.
>relations department. If no, and you have an outside antenna, try to
>borrow a different TV and compare what you see on the screen. If only
>your 2006 Sony has the problem, it might be time to get a better TV.
 
I have an el-cheapo signal-strength meter, and
this shows up to the second-top indication.
https://www.jaycar.com.au/digital-tv-signal-strength-meter/p/LT3332
>teleconfusion establishments have a mechanism for handling such
>complaints.
 
>Good luck.
Thank you.
I can always use a bit of luck.
John-Del <ohger1s@gmail.com>: Feb 22 06:39AM -0800

On Thursday, February 21, 2019 at 10:45:24 PM UTC-5, Peter Jason wrote:
 
> up into the maid's room, and buy a
> new one..especially since these have greater
> functionallity for movie formats.
 
LOL, glad I read the whole thread!!
technowb <pietrarca@gmail.com>: Feb 22 03:47AM -0800

Hi guys, thank you all.
I can confirm that in AMW842IX - that uses magnetron 2M236-M62 by default - we can use as an alternative magnetron 2M236-M42 by Panasonic. I am not sure if other brands of the same model works the same, however the oven is on duty again, and trying to repair it was worth the effort. :)
 
Thank you again
Phil Allison <pallison49@gmail.com>: Feb 21 11:58AM -0800


> On Tuesday, February 19, 2019 at 8:52:40 PM UTC-5, Phil Allison wrote:
 
> > ** Same composition as WD-40 at *many times* the price.
 
> Twit:
 
** Vile troll.
 
 
 
> Please note on the description: "Moderate Evaporation",
 
** Please do the planet a favour - go top yourself.
 
Autistic nut cases like are no use to anyone.
 
 
 
.... Phil
Peter Jason <pj@jostle.com>: Feb 22 07:44AM +1100

On Thu, 21 Feb 2019 11:58:18 -0800 (PST), Phil
 
>** Please do the planet a favour - go top yourself.
 
> Autistic nut cases like are no use to anyone.
 
>.... Phil
 
Are you in the correct NG? Are you lost?
Peter Jason <pj@jostle.com>: Feb 22 07:46AM +1100

On Tue, 19 Feb 2019 17:41:12 -0800, John Robertson
>as the composition of the sprays varies from ones for switches, etc..
 
>Do NOT use WD-40!!!!!(and on!!! and on!!!)
 
>John :-#)#
 
Would finely-powdered graphite work in this case.
Like the type used for door locks?
Phil Allison <pallison49@gmail.com>: Feb 21 12:51PM -0800

Peter Jason wrote:
 
 
 
> Are you in the correct NG? Are you lost?
 
** You are obviously lost AND on the wrong NG.
 
Smart arsed shits like you are a dime a dozen you know.
 
 
 
 
.... Phil
Phil Allison <pallison49@gmail.com>: Feb 21 12:54PM -0800

Some retard called Peter Jason wrote:
 
 
> Would finely-powdered graphite work in this case.
> Like the type used for door locks?
 
** Yeah - go ahead use plenty of it.
 
It can only be good for electronics.
 
 
 
 
..... Phil
"pfjw@aol.com" <peterwieck33@gmail.com>: Feb 21 12:54PM -0800

On Thursday, February 21, 2019 at 3:46:30 PM UTC-5, Peter Jason wrote:
 
> Would finely-powdered graphite work in this case.
> Like the type used for door locks?
 
 
Graphite is a rather good conductor. Not an ideal material for the purpose.
 
Peter Wieck
Melrose Park, PA
tabbypurr@gmail.com: Feb 22 12:41AM -0800

On Thursday, 21 February 2019 20:46:30 UTC, Peter Jason wrote:
 
> >John :-#)#
 
> Would finely-powdered graphite work in this case.
> Like the type used for door locks?
 
No.
1. It does not remove the gunk causing bad contact
2. It tends to short the resistance in use
3. It tends to create a short from track to case, which sometimes would be a problem.
 
It was sometimes used in the 1940s on pot tracks that had worn away, but that is not likely to be the problem, and certainly was not used by pouring powder in, and was at best a temporary bodge.
 
 
NT
Tim Schwartz <tim@bristolnj.com>: Feb 21 03:19PM -0500

Hello all,
 
A customer has an AR CD-04 with a bad display. This is a 4 digit green
LED display on a small board that mounts to the front panel board.
 
While the machine is a Philips/Magnavox based player, I do not know
what an equivalent model that might share the same display is.
 
Since I'd guess that many of these have been scrapped because of a
defective CDM-2 mechanism, I'm hoping someone has saved a chassis that
might have a good display or display board that they would be willing to
sell me.
 
Gentlemen, please check you junk rooms!
 
Regards,
Tim Schawrtz
Bristol Electronics
Ho-Ho-Kus, New Jersey
"pfjw@aol.com" <peterwieck33@gmail.com>: Feb 21 12:53PM -0800

https://www.google.com/search?rlz=1C1GCEU_enUS821US821&q=4-digit+LED+display&tbm=isch&source=univ&sa=X&ved=2ahUKEwjFtaOy2s3gAhVION8KHenJD-0QsAR6BAgAEAE&biw=1920&bih=969
 
 
Maybe just replace the LED Display?
 
Been there, done that, although not necessarily with the same color.
 
Peter Wieck
Melrose Park, PA
Look165 <look165@numericable.fr>: Feb 21 10:02PM +0100

Maybe the flat ribbon cable ; just shrten it at the end.
 
Tim Schwartz a écrit le 21/02/2019 à 21:19 :
Tim Schwartz <tim@bristolnj.com>: Feb 21 07:35PM -0500

Not possible to change the display to something else. This is a welded
construction type with a 'blob chip' on the back of the board that
interfaced to the microprocessor. Must be original type.
 
Thanks for the thought,
Tim
Bristol Electronics
 
 
Adam <adamg@pobox.comNOSPAM>: Feb 22 05:23AM

> LED display on a small board that mounts to the front panel board.
 
> While the machine is a Philips/Magnavox based player, I do not know
> what an equivalent model that might share the same display is.
 
I believe the Philips CD160, CD460, CD560, Magnavox CDB460, CDB560 and
Sylvania CD1650 have this display. There are a few on eBay but they're
not cheap!
 
There is a design for a DIY retrofit which may or may not be suitable:
https://www.diyaudio.com/forums/digital-source/259790-nsm4202a-led-display-module-replacement-philips-sony-cdm-transports.html
 
-- Adam
"pfjw@aol.com" <peterwieck33@gmail.com>: Feb 21 08:58AM -0800

https://www.politifact.com/facebook-fact-checks/statements/2018/dec/13/blog-posting/no-nancy-pelosis-home-doesnt-sit-behind-high-wall/
 
Facts here.
 
Peter Wieck
Melrose Park, PA
George <george@spacely-sprokets.com>: Feb 21 01:12PM -0500

On 2/21/2019 11:38 AM, Bob F wrote:
 
>> Nancy Pelosi has an immoral wall around her compound.  She also has people with guns protecting her home as well.
 
> With people like you in this country, I can certainly understand her worries.
 
Ted Kennedy's Oldsmobile has killed more people than my handguns.
"pfjw@aol.com" <peterwieck33@gmail.com>: Feb 21 10:48AM -0800

On Thursday, February 21, 2019 at 1:12:37 PM UTC-5, George wrote:
 
> Ted Kennedy's Oldsmobile has killed more people than my handguns.
 
As it happens, it was the water, not the car. And the car is a tool of the driver, much as weapons are the tool of the user.
 
You really are a Maroon!
 
Peter Wieck
Melrose Park, PA
John-Del <ohger1s@gmail.com>: Feb 21 11:38AM -0800

On Thursday, February 21, 2019 at 1:12:37 PM UTC-5, George wrote:
 
> Ted Kennedy's Oldsmobile has killed more people than my handguns.
 
 
 
 
You shouldn't pick on our American Treasures.
 
Ted Kennedy is reverently known as "The Naval Hero of Chappaquiddick"..
John-Del <ohger1s@gmail.com>: Feb 21 11:48AM -0800


> You really are a Maroon!
 
> Peter Wieck
> Melrose Park, PA
 
 
Yeah, but the car was still the instrument in her death. She was trapped in the Oldsmobile and couldn't escape from it. If she was thrown clear of the Olds, she would have lived assuming she could swim, and assuming she would have "survived" being a witness to an incident that included a Kennedy and a woman not his wife..
 
Maroon is such a underappreciated hue..
Bob F <bobnospam@gmail.com>: Feb 21 08:38AM -0800

On 2/21/2019 3:32 AM, George wrote:
>> around your house.  Open borders don't work.
 
> Nancy Pelosi has an immoral wall around her compound.  She also has
> people with guns protecting her home as well.
 
With people like you in this country, I can certainly understand her
worries.
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