Author Topic: Tech Talk (Read 6023 times)

Whizz · « **on:** August 13, 2012, 06:19:43 PM »

So Brock, does current flow from Positive to Negative or from Negative to Positive??

Brock · « **Reply #1 on:** August 13, 2012, 06:30:12 PM »

As I was properly trained, Both theories were taught, (Hole and Electron). In most Cars n Bikes it flows from +ve to -ve, unless its one of those that has a positive Earth. Also afecting current flow is the day of the week, and which hemisphere you are in.

(P.S. Multi meters measure electron flow )

Whizz · « **Reply #2 on:** August 13, 2012, 06:44:27 PM »

Isn't it great, the majority of the population would answer that question "Positive to Negative, stupid question!" but of course it isn't. Current flow is the movement of electrons, and they are negatively charged, and move to fill holes, so the current actually flows from negative to positive, and holes flow from positive to negative... as long as there is an "R" in the month!, and electrons circle the drain of a FET anticlockwise, I think

Brock · « **Reply #3 on:** August 13, 2012, 07:41:44 PM »

I dont actually think in either, I just pick the easiest at the time to try and explain how it works in simple terms.

terrydj · « **Reply #4 on:** August 13, 2012, 11:19:10 PM »

"WOW" Whizz and Brock, I just love it when you both let me know how lucky I am and how simple my life is

Brock · « **Reply #5 on:** August 13, 2012, 11:24:12 PM »

Anything to make your life better Terry

Whizz · « **Reply #6 on:** August 14, 2012, 09:29:57 AM »

We aim to please!!

winston66 · « **Reply #7 on:** August 14, 2012, 05:11:39 PM »

Winston66
Wonders
I always thought that a multimeter when set to a voltage range would indicate the potential difference between the two connetion points that the test leads were connected to.
If it were a decent type of meter it would also indicate the polarity of the connection points as a reference to the polarity of the test leads.

Cheers
winston 66 northampton

Biggles · « **Reply #8 on:** August 14, 2012, 08:39:05 PM »

Quote from: winston66 on August 14, 2012, 05:11:39 PM

Winston66
Wonders
I always thought that a multimeter when set to a voltage range would indicate the potential difference between the two connetion points that the test leads were connected to.
If it were a decent type of meter it would also indicate the polarity of the connection points as a reference to the polarity of the test leads.

Cheers
winston 66 northampton

That's what Brock said right at the beginning:

"Pedantic I know, but you will be measuring Voltage, not current (Amps)."

"Voltage" = "potential difference"

Brock · « **Reply #9 on:** August 14, 2012, 09:29:48 PM »

This new thread could be fun in a nerdy sort of way

Biggles · « **Reply #10 on:** August 14, 2012, 09:48:50 PM »

Quote from: Brock on August 14, 2012, 09:29:48 PM

This new thread could be fun in a nerdy sort of way

You're in your element! ::)

DaleMcLean · « **Reply #11 on:** August 15, 2012, 06:29:17 AM »

AND

There are only 10 types of people in this world

those that understand BINARY

and those that dont

Brock · « **Reply #12 on:** August 15, 2012, 08:18:52 AM »

I have used that before, and understand the joke..

Whizz · « **Reply #13 on:** August 15, 2012, 08:52:43 AM »

Biggles · « **Reply #14 on:** August 15, 2012, 09:51:53 AM »

You can count on it 10 (every) (singular) time.

Whizz · « **Reply #15 on:** August 15, 2012, 06:39:57 PM »

Winston, when talking about measuring amperes (current), 99% of the time you are actually measuring voltage but interpreting it as current...I'll explain;

Mechanical meters are connected in series with the circuit that you want to measure, but these meters can only handle a very small amount of current, so what happens is that a resistor is added in parallel to the meter (it's called a Shunt Resistor) and the majority of the current goes through that resistor. This causes a voltage drop across the resistor that is directly proportional to the amount of current flowing through that resistor, so the meter can be calibrated in Amps but in actual fact is measuring volts (or if you like "Potential Difference" between one end of the resistor and the other).

Digital ammeter designs use an analog to digital converter (ADC) to measure the voltage across the shunt resistor; the digital display is calibrated to display this voltage as the current through the shunt. Such instruments are generally calibrated to indicate the RMS (Root Mean Square) value for a sine wave only. This process also holds true for measuring DC currents.

So in both cases the parameter being measured is actually voltage, but it is being scaled as Amperes.

Weird eh?

Brock · « **Reply #16 on:** August 15, 2012, 07:30:27 PM »

Actyally its all done with smoke n mirrors..

rendog · « **Reply #17 on:** August 15, 2012, 08:49:12 PM »

I have never seen electricity and believe it is a figment of some clever barstards imagination.
It's continued propagation has ensured some capitalists have become very rich.
All the while sucking the hard earned dollars from the working class who were edumacated
by by the socialist government propaganda machines to enculturate into them a so-called scientific belief in electron flow.
And we all know the political class love to suck up to the capitalists to ensure a huge campaign fund come election time.
There is no such thing as electricity, you've all been brainwashed by American bourgeoisie facist regimes.

I am a firm believer in the blue smoke theorem.
I have seen blue smoke and once it left my television the thing never worked again.

Brock · « **Reply #18 on:** August 15, 2012, 09:00:07 PM »

Quote

I am a firm believer in the blue smoke theorem

Now that you have revealed the secret to the world, Thy life shall be forfeit...

Brian · « **Reply #19 on:** August 16, 2012, 11:29:24 AM »

Hi Guys
My uniden uh044sk has the busy signal on and won't scan ....

Whizz · « **Reply #20 on:** August 16, 2012, 12:09:13 PM »

Sounds like it is stuck on Transmit. See if you can get to someone else with a UHF and use theirs to see if yours is permanently transmitting, check the transmit switch to see whether it is stuck in.

Brock · « **Reply #21 on:** August 16, 2012, 12:21:03 PM »

Can you change the channel manually, is that one busy as well. if so, check your squelch settings

JuST Peter · « **Reply #22 on:** August 16, 2012, 01:13:36 PM »

Quote from: rendog on August 15, 2012, 08:49:12 PM

I am a firm believer in the blue smoke theorem.
I have seen blue smoke and once it left my television the thing never worked again.

Brian · « **Reply #23 on:** August 16, 2012, 06:26:50 PM »

Hey all,
Every channel is 'busy' when I press the transmit button the tx indicator lights up but the busy stays on .if I press scan it moves up one channel and the scan indicator blinks...I've checked online and in the manual all to no win. Just thought someone else may have come across it b4.

Brock · « **Reply #24 on:** August 16, 2012, 07:10:38 PM »

Definitely sounds like the squelch level is set too low. The squelch adjusts your receive sensitivity. Have a look at page 11 of your manual for setting the squelch. If you have lost the manual, then get one here.

http://www.uniden.com.au/RESOURCES_MAIN/pdfs/UHO44sx_OM.pdf

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Author Topic: Tech Talk (Read 6023 times)

terrydj

rendog