Digest for sci.electronics.repair@googlegroups.com - 15 updates in 5 topics

N_Cook <diverse@tcp.co.uk>: Jul 31 02:26PM +0100

Intermittant failure to heat.
Not due to failing switch, but original plastic stress-relief sheathing
at the blue body gone hard with age and causing stress to cable and then
a conductor break. Makes you wonder where all that plasticiser migrates
to, presumably us , quite a bit.
Terry Schwartz <tschw10117@aol.com>: Jul 31 08:34AM -0700

On Tuesday, July 31, 2018 at 8:26:55 AM UTC-5, N_Cook wrote:
> at the blue body gone hard with age and causing stress to cable and then
> a conductor break. Makes you wonder where all that plasticiser migrates
> to, presumably us , quite a bit.
 
It outgasses..... to atmosphere. Just like the buildup of haze on the inside of your windshield after a hot summer. That's your dashboard, vinyl, carpeting, wire insulation, powder coated parts, upholstery, foam, virtually everything in your car's interior except the metal itself, condensing on the glass and every other surface. Good reason to keep the air flowing thru the vehicle as you drive, minimize the inhalation of those compounds. Gotta love that new car smell.
"Mr. Man-wai Chang" <toylet.toylet@gmail.com>: Jul 31 09:18PM +0800

On 7/31/2018 8:13 PM, Paul wrote:
 
>     however, an unsafe power level may be collected by a
>     magnifying optic with larger aperture."
 
So all we need is an "accident" to hurt some babies' eyes? Which will
force them to see eye doctors and pay some treatment? Or maybe buying a
few pair glasses?
 
Oh well, I agree, it'll be good business. :)
 
--
@~@ Remain silent! Drink, Blink, Stretch! Live long and prosper!!
/ v \ Simplicity is Beauty!
/( _ )\ May the Force and farces be with you!
^ ^ (x86_64 Ubuntu 9.10) Linux 2.6.39.3
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"Mr. Man-wai Chang" <toylet.toylet@gmail.com>: Jul 31 10:51PM +0800

On 7/31/2018 10:40 PM, Paul wrote:
 
> And what treatment is there for a retinal burn ?
> I don't think there is any treatment, except for the
> doctor to say he can't help you.
 
Stem cells? :)
 
Would retina of some very old persons be more vulnerable to Class 1
laser burn? OK, I know Class 1 is supposed to 100% safe. But ... you
know there may be exceptions. :)
 
--
@~@ Remain silent! Drink, Blink, Stretch! Live long and prosper!!
/ v \ Simplicity is Beauty!
/( _ )\ May the Force and farces be with you!
^ ^ (x86_64 Ubuntu 9.10) Linux 2.6.39.3
不借貸! 不詐騙! 不賭錢! 不援交! 不打交! 不打劫! 不自殺! 不求神! 請考慮綜援
(CSSA):
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micky <NONONOmisc07@bigfoot.com>: Jul 31 04:02AM -0400

Satruday, july 28, at 10:50AM I was driving through Westminster Md,
listening to 88.1 FM, Baltimore,and I was getting two copies of the same
sounds, one a second or so delayed compared to the other.
 
This went on for at least 5 miles, at least 10 minutes.
 
It was nearly impossible to tell what was being said.
 
How could this happen?
 
It's a rural area with no very tall buildings and even if there were a
reflection, it would not reflect at me everywhere along a 5 mile line.
 
I've been there many times before, usually listening to the same
station, and it never happened before. So I don't think there is a
second station on the same frequency in radio range.
 
 
Could it be that the transmitter itself was sending out two copies of
the sound, one second apart?
 
 
After about 10 minutes, it stopped and the sound was good again.
bruce2bowser@gmail.com: Jul 31 03:14AM -0700

On Tuesday, July 31, 2018 at 4:02:55 AM UTC-4, micky wrote:
 
> This went on for at least 5 miles, at least 10 minutes.
 
> It was nearly impossible to tell what was being said.
 
> How could this happen?
 
Have you thought of calling and telling that radio station?
Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>: Jul 31 07:48AM -0400

On 07/31/2018 04:02 AM, micky wrote:
 
> Could it be that the transmitter itself was sending out two copies of
> the sound, one second apart?
 
> After about 10 minutes, it stopped and the sound was good again.
 
Well, to be multipath the echo would have to be coming from 150,000 km
away, so that isn't too likely. ;)
 
Maybe a repeater that got out of sync?
 
Cheers
 
Phil Hobbs
 
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics
 
160 North State Road #203
Briarcliff Manor NY 10510
 
hobbs at electrooptical dot net
http://electrooptical.net
Terry Schwartz <tschw10117@aol.com>: Jul 31 06:12AM -0700

On Tuesday, July 31, 2018 at 3:02:55 AM UTC-5, micky wrote:
 
> Could it be that the transmitter itself was sending out two copies of
> the sound, one second apart?
 
> After about 10 minutes, it stopped and the sound was good again.
 
We have a local AM radio station that on a daily basis, I can hear two or more commercials playing on top of each other. Typically gets corrected before the programming starts again. I think I'm hearing a locally fed commercial and a network based spot at the same time. Sometimes both over traffic or weather... Just poor production.
Bob F <bobnospam@gmail.com>: Jul 31 07:12AM -0700

On 7/31/2018 1:02 AM, micky wrote:
 
> Could it be that the transmitter itself was sending out two copies of
> the sound, one second apart?
 
> After about 10 minutes, it stopped and the sound was good again.
 
Very likely an out of sync repeater. It looks like they have 2 repeaters.
http://www.wypr.org/your-public-radio-fcc-public-file
Jeff Liebermann <jeffl@cruzio.com>: Jul 31 07:50AM -0700


>Very likely an out of sync repeater. It looks like they have 2 repeaters.
>http://www.wypr.org/your-public-radio-fcc-public-file
 
Agreed, but WYPR only simulcasts with one station on 88.1MHz (WYPF):
<https://en.wikipedia.org/wiki/WYPR>
The station broadcasts on 88.1 MHz on the FM band. Its
studio is in the Charles Village neighborhood of
northern Baltimore, while its transmitter is in
Park Heights. The station is simulcast in the
Frederick and Hagerstown area on WYPF (88.1 FM) and
in the Ocean City area on WYPO (106.9 FM).
 
For a generic FM broadcast receiver, capture effect requires that one
signal is 2dB more than the other in order to get a 30dB of reduction
in "noise" from the weaker station. If the two signals are roughly
equal at the receiver, then you'll get no isolation and hear both
stations. Since KYPR and WYPF are both on 88.1 and fairly close to
each other, my guess(tm) is that their transmit frequencies are both
phase locked to some common reference, and that their audio feeds are
adjusted for identical delays. In other words, they're setup for
simulcast. However, that's a guess(tm) because I'm in a rush and
don't have time to read exactly what they're doing.
 
 
--
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
"Mr. Man-wai Chang" <toylet.toylet@gmail.com>: Jul 31 09:03PM +0800

On 7/31/2018 8:13 PM, Paul wrote:
>     however, an unsafe power level may be collected by a
>     magnifying optic with larger aperture."
 
> Looks like that baby is safe. Nothing to worry about.
 
There are counters with handheld laser scanner. And those handheld
scanners are NOT placed carefully to avoid customers, at least I saw
that in Hong Kong.
 
Did they do it deliberately? Is it a secret laser experiment? Well... :)
 
--
@~@ Remain silent! Drink, Blink, Stretch! Live long and prosper!!
/ v \ Simplicity is Beauty!
/( _ )\ May the Force and farces be with you!
^ ^ (x86_64 Ubuntu 9.10) Linux 2.6.39.3
不借貸! 不詐騙! 不賭錢! 不援交! 不打交! 不打劫! 不自殺! 不求神! 請考慮綜援
(CSSA):
http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa
Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>: Jul 31 10:09AM -0400

On 07/31/2018 09:03 AM, Mr. Man-wai Chang wrote:
> scanners are NOT placed carefully to avoid customers, at least I saw
> that in Hong Kong.
 
> Did they do it deliberately? Is it a secret laser experiment? Well... :)
 
That beam is moving so fast that the dwell time on the retina is really,
really short--probably tens of microseconds. That helps a lot.
 
Cheers
 
Phil Hobbs
 
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510
 
http://electrooptical.net
http://hobbs-eo.com
"Mr. Man-wai Chang" <toylet.toylet@gmail.com>: Jul 31 10:27PM +0800

On 7/31/2018 10:09 PM, Phil Hobbs wrote:
 
> That beam is moving so fast that the dwell time on the retina is really,
> really short--probably tens of microseconds.  That helps a lot.
 
And you are not wearing those handheld laser scanners like a VR
glass/helmet ...oh well... Um....
 
Is there safety classification for VR glasses/helmets? :)
 
--
@~@ Remain silent! Drink, Blink, Stretch! Live long and prosper!!
/ v \ Simplicity is Beauty!
/( _ )\ May the Force and farces be with you!
^ ^ (x86_64 Ubuntu 9.10) Linux 2.6.39.3
不借貸! 不詐騙! 不賭錢! 不援交! 不打交! 不打劫! 不自殺! 不求神! 請考慮綜援
(CSSA):
http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa
Terry Schwartz <tschw10117@aol.com>: Jul 30 07:11PM -0700

Late era TV tubes. I pay shipping + nominal pricing. Must be in original boxes.
Terry
 
 
3DZ4 medium mu triode
6BK7/6BQ7 twin triode uhf preamp
6BS8 dual triode
6DS4 triode rf amp
6EV5 sharp cutoff tetrode vhf amp
6GK6 beam power pentode audio/video amp
6KD8 triode pentode vhf osc mixer
10JV8 10JY8 triode pentode sync vid amp
12AE6 double diode triode det amp car radio
12AF6 pentode amp car radio
12DS7 duplex diode tetrode auto radio
12K5 tetrode auto radio pwr amp
15CW5 pentode af amp
36AM3 1/2 wave rectifier
2AS2 hv rect
6AF11 double triode pentode agc sync video amp
6AL11 beam power pentode fm det & audio
6AR11 twin pentode if amp
6AX3 damper diode
6EW7 double triode v osc v amp
6HE5 pentode v amp
6Q11/6K11 triple triode sync clipper & agc
12AY3 1/2 wave rect damper
5U4/5V3 full wave rect
6BY5 double diode damper, rect
6DQ6 beam pentode h defl amp
6GT5 beam pentode h defl amp
6GW6 beam pentode h defl amp
6JE6 beam pentode h defl amp
21HJ5 beam pentode h defl amp
25CD6/25DN6 beam pentode h defl amp
bruce2bowser@gmail.com: Jul 31 03:15AM -0700

On Monday, July 30, 2018 at 10:11:33 PM UTC-4, Terry Schwartz wrote:
> 6JE6 beam pentode h defl amp
> 21HJ5 beam pentode h defl amp
> 25CD6/25DN6 beam pentode h defl amp
 
Aren't drug store pyrex glass tubes used for smoking rock cocaine?
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