Digest for sci.electronics.repair@googlegroups.com - 16 updates in 7 topics

sam a <sadi.facee@gmail.com>: Feb 23 12:19AM -0800

YouTube videos of
 

 
U.S. Congress money laundering hearing
 
 
of
 
Saudi Billionaire " Maan Al sanea"
 
with bank of America
 
 
and The owner of Saad Hospital and Schools
 
in the Eastern Province in Saudi Arabia
 

 
and the Chairman of the Board of Directors of Awal Bank in Bahrain
 
 
With Arabic Subtitles
 

 

 
موقع اليوتيوب الذي عرض جلسة استماع الكونجرس الأمريكي
 
لمتابعة نشاطات غسل الأموال ونشاطات
 

 
السعودي معن عبدالواحد الصانع
 

 
مالك مستشفى وشركة سعد ومدارس سعد بالمنطقة الشرقية بالسعودية ورئيس مجلس ادارة بنك اوال البحريني
 

 
مترجم باللغة العربية
 

 
http://www.youtube.com/watch?v=mIBNnQvhU8s
luis.cova09@gmail.com: Feb 22 10:42PM -0800

shawneesdad@gmail.com: Feb 22 05:51PM -0800

Hi. I have a IFR1600 service monitor that was working perfectly but now will not power on. I suspect that the power supply module has a stuck relay as last time it worked it would not turn off and I unplugged it to get it to turn off. Anyone have a schematic of the power supply and power up circuit? Or if you have run into this problem please feel free to offer suggestions. Thanks for your time and help.
 
Regards
 
Richard in NC
Jeff Liebermann <jeffl@cruzio.com>: Feb 22 08:18PM -0800


>Hi. I have a IFR1600 service monitor that was working perfectly but now will not power on. I suspect that the power supply module has a stuck relay as last time it worked it would not turn off and I unplugged it to get it to turn off. Anyone have a schematic of the power supply and power up circuit? Or if you have run into this problem please feel free to offer suggestions. Thanks for your time and help.
 
IFR power supplies seem to be a problem. I have an IFR-1500, also
with a power supply problem:
<http://www.learnbydestroying.com/jeffl/IFR-1500%20Power%20Supply%20Repair/IFR-1500%20power%20supply%20repair.html>
The repair didn't last and it died again after about 2 years. I then
replaced every semiconductor and capacitor in the AC power supply
section trying to revive the PS but no luck. I'm now looking into a
replacement brick power supply for AC only operation because I don't
need 12V operation. Amazingly, the original PS still runs on 12V,
which is the way I currently run it. You might want to check if yours
also runs on 12V.
 
You should be able to find the necessary documentation here:
<http://www.repeater-builder.com/test-equipment/aeroflex/aeroflex-index.html>
 
If you want to buy a power supply or have yours repaired:
<http://www.siliconinvestigations.com/ifrrep/ifr1600/ifr1600.htm>
 
Good luck and please let me know if you find anything in your power
supply. I suspect the IFR-1600 might be similar to the IFR-1500 power
supply design.
 
--
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
shawneesdad@gmail.com: Feb 22 06:06PM -0800

You can always use the high voltage probe to check microwave oven magnatrons. Of course a neon bulb works fine for that too
Fred McKenzie <fmmck@aol.com>: Feb 22 12:14PM -0500

In article <93707e9n1eca880srascnr59t56g1krnnr@4ax.com>,
 
> Or.....
 
> Does anyone know where I can find the modification I want to make
> to maintain memory?
 
John-
 
I have a Radio Shack HTX-10 transceiver with that problem. When
disconnected from any power source, memory contents were maintained by
the charge on a 220 Microfarad capacitor. Over a month, memory contents
were lost due to leakage.
 
I installed a 3.6 Volt Lithium battery, isolated by a 1N4004 diode,
across the capacitor. This approach may work for you if the operating
memory voltage is higher than 3.6 Volts.
 
Last time I checked, memory contents were still good after ten years!
 
Fred
Lucifer <LuciferMorningstar@bigpond.com>: Feb 23 08:28AM +1100


>Hi,
 
> My Bearcat BC855XLT looses it's memory once in a great
>while. Note: I am a service technician.
 
Have you tried bending the pins to stop the memory
becoming loose?
 
Allodoxaphobia <trepidation@example.net>: Feb 23 01:52AM

On Sat, 23 Feb 2019 08:28:43 +1100, Lucifer wrote:
>> while. Note: I am a service technician.
 
> Have you tried bending the pins to stop the memory
> becoming loose?
 
https://theoatmeal.com/static/misspelling.html
thekmanrocks@gmail.com: Feb 22 09:50AM -0800

Peter Jason wrote: "Last year I had several month's of TV interference
on some channels, mainly pixelation but sometimes
"no signal". Worse on some channels.
 
Then, up to now, the interference has stopped, all
by itself, "
 
 
Welcome to the world of digital OTA TV broadcast - the
biggest scam ever perpetuated on American consumers
since the 'Federal' Reserve"
Jeff Liebermann <jeffl@cruzio.com>: Feb 22 02:48PM -0800


>On Thu, 21 Feb 2019 18:03:25 -0800, Jeff
>Liebermann <jeffl@cruzio.com> wrote:
 
>>On Wed, 20 Feb 2019 15:53:14 +1100, Peter Jason <pj@jostle.com> wrote:
 
Hmmm... The time zone shows that you're in +1100 which I would
guess(tm) is south-eastern Australia on DST. Is that correct?
If so, much of what I said may not apply as the TV and cellular
standards might be different. I know zero about those for Australia
and therefore suggest you find a local source of technical help.
 
>OTA?
 
OTA = Over The Air as in broadcast TV.
 
>The top set have been disconnected because they're
>too high to reach, so the TV runs on the bottom
>one.
 
I see a few problems.
1. You are well below the main lobes of the cellular antennas on the
nearby roof but close enough that you are going to see problems
created by all the transmitters.
2. Running the 3 guy wires through the elements of the lower antenna
will have a detrimental effect on the antenna pattern and gain. I
suggest you remove the galvanized guy wires and replace them with a
non-conductive equivalent such as a UV resistant polyester or kevlar
guy wires.
3, The mast clamp, where the 3 guy wires meet, is heavily rusted.
This is normally not a problem. However, in a high RF field
environment, rusted metal can produce a diode junction, which will mix
two or more signals or their harmonics to produce what is called
intermodulation. This intermodulation is a possible source of your
alleged interference. You can temporarily fix a problem cause by a
rusty connection by simply beating on the mast with a hammer to break
through the rust. However, given time and weather, it will be back. I
suggest you replace the clamp with something that is hot dip
galvanized or plastic insulated.
4. The unused upper antenna appears to include a small UHF antenna
below the main VHF antenna. I only see a single coaxial cable, but no
VHF/UHF band splitter. If you eventually resurrect the upper antenna,
you might check if it's wired properly.
5. Thank you for the nice photo of the upper antenna, which is not
being used, but only part of the lower antenna, which is being used. I
wanted to see the feed point of the lower antenna, which was cut off.
Also, I can barely see half of what might be a UHF element on the
front of the lower antenna.
 
 
>>Which channels?
 
>All channels, though the lower-freq ones are
>worse.
 
Improbable. There are no jammers or signal sources that can wipe out
the entire TV spectrum. For Australia DTV, that would be 694-820 MHz.
<https://www.communications.gov.au/what-we-do/spectrum/digital-dividend-spectrum>
Certainly not interference caused by a cellular transmitter, which
would be far more noticeable on the higher channels than the lower.
 
It's possible that there is so much RF that the front end of your
unspecified model Sony TV receiver is being overload. This is called
"blocking" where the high RF level is rectified by the amplifying
devices in the front end of the receiver, causing the biasing of the
devices to change, and generally reducing its gain. This would reduce
the receiver sensitivity on all channels, as you describe. However,
unless something in the antenna farm is running really high power, or
your unspecified model Sony TV receiver is poorly designed, such
blocking is improbable. (Possible, but not likely).
 
>>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.
 
Well, I see three possibilities:
1. Your antenna and/or coaxial cable system is intermittent due to
either a short across the coax, or a bad connection on the center pin
or shield. It could be anywhere but most likely at the connector
ends. Also, look for "U" staples punching through the coax cable.
2. Your TV has a problem. Test with by borrowing another TV and
comparing. If only your TV has the problem, the culprit is obvious.
3. A fairly high power cellular transmitter nearby was turned off.
 
>up into the maid's room, and buy a
>newone..especially since these have greater
>functionallity for movie formats.
 
Is there some reason why you have failed twice to provide the model
number of your 2006 Sony 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
 
I'm not familiar with that product. It will tell you if you have a
signal in the TV band, but will not tell you on what channel, or
whether it's a TV transmitter or cellular transmitter.
 
>Thank you.
>I can always use a bit of luck.
 
You're welcome. However, there's a problem. You're doing a splendid
job of obscuring your information and ignoring my questions. This is
YOUR problem, not mine. I'm trying to help, but making me do extra
work by having to guess your location, your TV model, and your
relative position to the likely source of interference, is not being
very cooperative or helpful. When you see a sentence end in a
question mark, please try to answer the question.
 
--
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
Phil Allison <pallison49@gmail.com>: Feb 22 03:16PM -0800

Jeff Liebermann wrote:
 
 
> Improbable. There are no jammers or signal sources that can wipe out
> the entire TV spectrum. For Australia DTV, that would be 694-820 MHz.
 
 
** Australian DTV is broadcast on the VHF band in all capitol cities using channels 6 to 12. Rural areas use UHF.
 
 
https://en.wikipedia.org/wiki/Australian_and_New_Zealand_television_frequencies#Frequency_allocation_table
 
The OP's antenna pic shows he is still using VHF signals.
 
 
> <https://www.communications.gov.au/what-we-do/spectrum/digital-dividend-spectrum>
 
 
** That link is irrelevant cos it speaks only of the frequencies that were "freed up" by the switch to DTV - they were all UHF ones.
 
The VHF band acquired new DTV signals on all the previously unused gaps between analogue TV signals as well as the existing ones.
 
 
.... Phil
Peter Jason <pj@jostle.com>: Feb 23 11:58AM +1100

On Fri, 22 Feb 2019 14:48:51 -0800, Jeff
>relative position to the likely source of interference, is not being
>very cooperative or helpful. When you see a sentence end in a
>question mark, please try to answer the question.
 
Thanks
 
I'll be back. And have some more details next
week.
"pfjw@aol.com" <peterwieck33@gmail.com>: Feb 22 10:15AM -0800

Imagine if our Tourette's Twit from Australia were to engage in its little fits face-to-face with its neighbors, acquaintances and customers?
 
Dubious that it would still be alive, much less at liberty.
 
I have often thought about asking a friend of mine who travels throughout the Down Under on a regular basis to see if he can get a picture of Mr. Allison - just for giggles. He is an ordained minister, so no threat.
 
Peter Wieck
Melrose Park, PA
Phil Allison <pallison49@gmail.com>: Feb 22 12:20PM -0800

pf...@aol.com wrote:
 
 
 
** Grandiose, autistic shitheads need to be got rid of.
 
People like Peter Wieck are a pox on the face of the earth.

In ordinary life one simply avoids complete pricks like them - but on usenet the cretins are in your face and will not go away no matter how many times you direct them.
 
 
> Peter Wieck
> Melrose Park, PA
 
 
This old fool is a demented troll who thinks he OWNS the NG.

He fucking well does not.
 
 
 
..... Phil
"pfjw@aol.com" <peterwieck33@gmail.com>: Feb 22 12:25PM -0800

Yo, twit:
 
Watch for that stranger with a phone pointed in your direction. Could happen at any time, anywhere that you crawl out from under your rock, or out of your cellar. Really.
 
Pete Wieck
Melrose Park, PA
tabbypurr@gmail.com: Feb 22 01:28PM -0800

On Friday, 22 February 2019 20:20:35 UTC, Phil Allison wrote:
 
> This old fool is a demented troll who thinks he OWNS the NG.
 
> He fucking well does not.
 
> ..... Phil
 
now there's irony
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