Digest for sci.electronics.repair@googlegroups.com - 24 updates in 6 topics

tabbypurr@gmail.com: Oct 09 08:46AM -0700

A standing issue is pots that include on/off switches, lack of availability thereof. Anyone have any suggestions on repairing or replacing these?
 
 
NT
"pfjw@aol.com" <peterwieck33@gmail.com>: Oct 09 09:31AM -0700

> A standing issue is pots that include on/off switches, lack of availability thereof. Anyone have any suggestions on repairing or replacing these?
 
> NT
 
https://www.oldradioparts.net/
 
Mark Oppat calls himself, with justification, the King of Kontrols.
 
Peter Wieck
Melrose Park, PA
Rob <nomail@example.com>: Oct 09 04:31PM

> Nothing I found will answer this simple question >>> Does a usb type c
> port need something connected to negotiate for the output power to be
> turned on ?? <<<
 
They start at 5V/0.5A and need negotiation to get a higher output
voltage or -current.
etpm@whidbey.com: Oct 08 11:19AM -0700

On Mon, 7 Oct 2019 12:03:13 -0500, Fox's Mercantile <jdangus@att.net>
wrote:
 
 
>Leave the silver dipped micas, tubular ceramics, and any "postage
>stamp" micas alone for the time being.
 
>Replace them one at a time. Take pictures, make notes.
I have tried to identify what types of caps are in this scope but
have been unable to find a site that shows the caps I'm wondering
about. I think some are tubular ceramic caps because they are white
ceramic tubes that are filled with some sort of hard potting compound.
The other type of cap is also tubular but is molded brown hard
plastic. These caps are 5/8" diameter x 1 5/8" long. They are .1 MFD
at 400 WVDC. Anybody know?
Thanks,
Eric
Fox's Mercantile <jdangus@att.net>: Oct 08 01:56PM -0500

> The other type of cap is also tubular but is molded brown hard
> plastic. These caps are 5/8" diameter x 1 5/8" long. They are .1 MFD
> at 400 WVDC. Anybody know?
 
The wax paper caps come in several varieties.
(Usually) Brown cardboard with a wax coating.
Molded plastic, and ceramic tube.
All of those need to be replaced.
 
 
--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com
etpm@whidbey.com: Oct 08 01:56PM -0700

On Tue, 8 Oct 2019 13:56:52 -0500, Fox's Mercantile <jdangus@att.net>
wrote:
 
>(Usually) Brown cardboard with a wax coating.
>Molded plastic, and ceramic tube.
>All of those need to be replaced.
What kind of cap should I replace them with?
Thanks,
Eric
Fox's Mercantile <jdangus@att.net>: Oct 08 04:03PM -0500

> What kind of cap should I replace them with?
 
These:
<http://www.tuberadios.com/capacitors/>
Yellow mylar film 630 vdc.
 
 
--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com
etpm@whidbey.com: Oct 09 08:48AM -0700

On Tue, 8 Oct 2019 16:03:45 -0500, Fox's Mercantile <jdangus@att.net>
wrote:
 
 
>These:
><http://www.tuberadios.com/capacitors/>
>Yellow mylar film 630 vdc.
Thanks. I'm ordering all the caps right now on my tablet. With the
little inductor its way I''l be set to repair the scope. BTW, as I was
looking for all the caps I found a broken wire in the vertical stage.
After figuring out where it was supposed to go and re-soldering it I
tried the scope again and now it works! Still, the waveform is messed
up so the new caps are needed.
Eric
tabbypurr@gmail.com: Oct 09 08:53AM -0700

On Monday, 7 October 2019 18:03:22 UTC+1, Fox's Mercantile wrote:
 
> Leave the silver dipped micas, tubular ceramics, and any "postage
> stamp" micas alone for the time being.
 
> Replace them one at a time. Take pictures, make notes.
 
You will of course encounter restorers who don't agree with this approach. Foxy is not known for seeing both sides of this picture.
 
Ceramic tube caps are often paper. A chinese component tester picks up most bad caps, and is supereasy to use. £12 last time I looked.
 
 
NT
Trevor Wilson <trevor@rageaudio.com.au>: Oct 09 06:59AM +1100

> Hi Comrades, please what is the simplest way to reduce the speed of a single phase induction motor to about 50%?
> also can a universal motor run for 24 hours on 90% load? (with all name plate ratings observed)
> thank you.
 
**This may be of some use:
 
http://www.siliconchip.com.au/Issue/2012/April/1.5kW+Induction+Motor+Speed+Controller%2C+Pt.1?res=nonflash
 
Appropriate alterations to suit your local mains supply will be required
of course.
 
--
Trevor Wilson
www.rageaudio.com.au
 
--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
tabbypurr@gmail.com: Oct 09 08:50AM -0700


> Hi Comrades, please what is the simplest way to reduce the speed of a single phase induction motor to about 50%?
 
As folk have said, that's not a simple thing. There are various ways but all have issues, in some case the issue is just cost/complexity.
 
 
> also can a universal motor run for 24 hours on 90% load? (with all name plate ratings observed)
> thank you.
 
if it's rated to run continuously at 90% or greater load, yes. Otherwise no.
 
 
NT
KenW <ken1943@invalid.net>: Oct 09 09:44AM -0600

Nothing I found will answer this simple question >>> Does a usb type c
port need something connected to negotiate for the output power to be
turned on ?? <<<
 
My new usb tester shows no voltage on this type port, but type A is
ok.
 
Thanks
Arlen _G_ Holder <_arlen.george@halder.edu>: Oct 09 05:52AM

Just curious how far your Wi-Fi access point is from your desktop computer.
<https://i.postimg.cc/VvqLKQtQ/wifi.jpg>
 
The access point my desktop connects to is about a half dozen miles away.
An antenna is plugged into the RJ45 Ethernet port on the desktop.
The signal strength, even at more than a half-dozen miles, is about -55dBM.
 
Just curious how far your nearest WiFi access point is from your desktop?
Fox's Mercantile <jdangus@att.net>: Oct 09 01:54AM -0500

On 10/9/19 12:52 AM, Arlen _G_ Holder wrote:
[ The usual pointless shit ]
 
"Ma, call the plumber, the toilet's backed up again."
 
 
--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com
Arlen _G_ Holder <_arlen.george@halder.edu>: Oct 09 07:47AM

On Wed, 9 Oct 2019 03:56:13 -0300, pjp wrote:
 
> pay for faster package and I suspect there's very few others using
> attenna at same speed given it's very rural area, e.g. most would be
> basic package I suspect.
 
Hi pjp,
Thanks for that information where you have a transceiver, like I do,
instead of a cable or dsl modem, about a kilometer away, line of sight.
 
Our transceivers are essentially equivalent in function to the cable modems
that most people who live in suburbia or in cities have in their homes.
 
My setup, like yours, is also WISP, where, being rural, we don't have
access to cables or pipelines either - just like you. We have wells. We
have septic systems. We have thousand gallon propane tanks. We even have
our own electrical generators, since the power company is highly
unreliable. (For example, tonight, the power is scheduled to go off, as one
temporal example - for about a day or two - as far as we know.)
<https://sanfrancisco.cbslocal.com/2019/10/08/power-outage-quarter-million-bay-area-residents-pge-red-flag-winds/>
 
The only "utilities" that we have which are public are the electrical and
phone wires, but, like you, we're way too far from the station for DSL to
ever work.
 
Like you, I have to aim my antenna at the nearest access point by sight,
where there's also an "aimer application" in the radio which beeps ever
faster, and lights up various colors (red orange yellow green blue, etc.)
as our signal strength increases. Since we're in a windy area, we sometimes
need to manually re-align the antennas, where, as you've likely found out,
we can eyeball it pretty closely (within a few decibels anyway).
 
If you know what equipment you're using, that would be of interest. I'm
using a Rocket M5 from Ubituiti, on the 5GHz spectrum, transmitting at near
or about the legal limit for the USA (which, luckily, is higher than it
seems to be in most other countries for some reason).
 
The radios are set to never exceed the legal limit - but they need to be
set up pretty close, since the distance is miles (about 10 km) to the
nearest WiFi Internet access point.
 
Do you know your transmit power?
 
I was on the 2.4GHz Wi-Fi spectrum for the longest time, but when I ran
waterfall spectrum analysis, it was horrid how much noise there was from
all sorts of frequencies, not all of which were WiFi signals.
 
Even our cellular is a bit dicey where we are, as T-Mobile gave me BOTH a
cellular repeater and a femtocell, so I can either pick up cellular signal
from about 10 or 15 miles away (or so), or, I can pick up the cellular
antenna that is literally inside my house (both work but the femtocell
seems to connect more reliably, based on the software utility on my iOS and
Android cellular devices).
 
Here's a picture of just some of the access points in my house, where the
iPad shows the physical size of the access points. That black device on the
shelf to the left of the blue router is the cellular repeater from T-Mobile
(all the carriers provide repeaters & femtocells):
<https://i.postimg.cc/YqTk0q1T/ap.jpg>
 
Where you are, what do you use for amplifying your cellular signal?
Gavin <gavin.newsom@kalifornia.guv>: Oct 09 06:57AM -0400

On 10/9/19 1:52 AM, Arlen _G_ Holder wrote:
> An antenna is plugged into the RJ45 Ethernet port on the desktop.
> The signal strength, even at more than a half-dozen miles, is about -55dBM.
 
> Just curious how far your nearest WiFi access point is from your desktop?
 
Wifi access point is off, I use ethernet.
"pfjw@aol.com" <peterwieck33@gmail.com>: Oct 09 04:25AM -0700

Don't Feed the Troll!
 
Peter Wieck
Melrose Park, PA
Terry Coombs <snag_one@msn.com>: Oct 09 06:40AM -0500

On 10/9/2019 12:52 AM, Arlen _G_ Holder wrote:
> An antenna is plugged into the RJ45 Ethernet port on the desktop.
> The signal strength, even at more than a half-dozen miles, is about -55dBM.
 
> Just curious how far your nearest WiFi access point is from your desktop?
 
  My desktop isn't wireless ... but the comp hooked to the TV and the
one hooked to the stereo are , and the WiFi router sits on a shelf above
my desk . Right next to our DSL modem .
 
--
Snag
Yes , I'm old
and crochety - and armed .
Get outta my woods !
Frank <"frank "@frank.net>: Oct 09 07:44AM -0400

On 10/9/2019 6:57 AM, Gavin wrote:
>> -55dBM.
 
>> Just curious how far your nearest WiFi access point is from your desktop?
 
> Wifi access point is off, I use ethernet.
 
Mine too. Where my machines are, catercorner on first floor to modem on
2nd floor I get about 3X speed with ethernet vs wifi.
Fox's Mercantile <jdangus@att.net>: Oct 09 08:03AM -0500

Pay attention folks.
Our resident cesspool of useless discussions isn't talking about
your in the house WiFi modem.
He's talking about Wireless internet service.
 
--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com
Frank <"frank "@frank.net>: Oct 09 09:21AM -0400

On 10/9/2019 9:03 AM, Fox's Mercantile wrote:
> Our resident cesspool of useless discussions isn't talking about
> your in the house WiFi modem.
> He's talking about Wireless internet service.
 
Close enough. Perhaps once speeds reach wired, none will need wired.
But not me as towers are behind a hill where I live.
I involves the home and is an on topic topic.
"pfjw@aol.com" <peterwieck33@gmail.com>: Oct 09 06:27AM -0700

On Wednesday, October 9, 2019 at 9:22:19 AM UTC-4, Frank wrote:
 
> Close enough. Perhaps once speeds reach wired, none will need wired.
> But not me as towers are behind a hill where I live.
> I involves the home and is an on topic topic.
 
Not really. You will find that this particular troll does not ask a question unless it has a rigid, fully conceived answer. And the posts are not to gather information, but rather to see itself engaged and meaningful.
 
Repeat, do not feed the troll!
 
Peter Wieck
Melrose Park, PA
Gary <g.majors@att.net>: Oct 09 10:36AM -0400

Just curious how far your Wi-Fi access point is from your desktop
computer.
<https://i.postimg.cc/VvqLKQtQ/wifi.jpg>
 
The access point my desktop connects to is about a half dozen
miles away.
An antenna is plugged into the RJ45 Ethernet port on the desktop.
The signal strength, even at more than a half-dozen miles, is
about -55dBM.
 
Just curious how far your nearest WiFi access point is from your
desktop?
--------------------------------------------------------------------------
To answer the OP, I use a neighborhood wifi for insecure use.
Only get about 1/2 block away near my bedroom window.
Move out of the bedroom and connection is lost.
 
It's 54 Mbps optimum but normally connect speed goes down
to 1 Mbps.
 
For secure stuff, I still use dial-up.
Fox's Mercantile <jdangus@att.net>: Oct 09 10:04AM -0500

On 10/9/19 9:36 AM, Gary wrote:
[ nothing of interest ]
 
Piss off Arlen.
 
 
 
--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com
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