Відео

Hello and sorry for my English via translator. Do you recommend this bhi DSPKR or the Dual in-line? Thanks in advance. 73

In Gestalt Psychology ground is the context out of which the figure emerges. It's a matter of perception.

Its A plot to keep us off the Air. Most of us can build an amplifier faster that renewing a license 😢 My extra class is gone! Exsprired while wrestling with fcc back and forth support emails..computer generated too..useless

Do i need a Lightning arrester for a DB420 8 bay UHF folded dipole antenna

So refreshing to hear a woman give a technical talk about radio … RfF … grd .., etc. outstanding. Wish more women would be doing this .👍🥃🇦🇺

wonderful. thanks for posting.

It was mentioned that connecting ground connector on equipment chassis to outside rods can "invite" lightning to inside. Won't coax shield itself invite lightning anyway? (lightning antenna -> coax shield -> radio -> electrical ground -> electrical rods outside house/at transformer station - as a path)

Excellent presentation Steve! Bringing more fun to ham radio - this is just the start!

FT4 would make things more exciting!

LOL need to filter out dups! KB2GCG

Howdy Y'all check out the monthly game on the @FreqFrenzy channel on youtube!

I never really paid attention when the game was posted. Now I understand the concept. Looks like fun. Third Thursday of the month!!

You lost me

Back to Pen and paper logging.

Great video, I will be in the shack out back at my QTH with temporay antennas and a generator to stay in the spirit of FD. de N9TDE

at hottest day of the year... I wonder if ARRL would consider changing that to a more pleasing season... 73 to all... BTW I am not participating in FD, forecast is 102F that weekend and I have trouble dealing with heat but that is just me of course ... best of luck to everyone... I love the event, just not "when" its done.

Greetings from Sweden! You got yourselves a thumps up and a new subscriber 🎉

Folks, after spending 1.5 weeks trying to renew, I stumbled upon the magic key that opens the door to renewal. You must make sure that you give yourself permission to view financial information on the CORES web page. Look for the manage permissions link and give yourself permission. After you adjust permission, the pay button will work. I hope this helps.

Howdy! Are there any writeups on being a GOTA Coach? I have dedicated myself to promoting Ham Radio in the Silicon Valley, and trying to build the support structure for new hams that I, as a new ham, failed to find. Sadly, it turns out if you are naive enough to raise your hand at the wrong time, you end up on the board of several clubs. Trying to get all the clubs to support the SPECS MeetUp to promote radio with other groups, I ended up as a "co-captain" of a GOTA station at my first field day. Then the captain bowed out. I have been hosting events on the MeetUp, and at the Electronics Flea Market (used by many clubs as their fundraising source) to promote ham radio, and I plan to use the GOTA to entice people to get their licenses. I don't really care about "points". I have asked our Section leader to put me in touch with an ARRL ACC to find out what that entails as I may consider that role since I may be doing it already. What resources does ARRL have to help people like me get going? I am working on PowerPoint decks, and Word docs for new hams, but seems this is something that should already exist. Feels like I am all alone out here.....

It’s a marketing ploy by Big Copper to sell you more wire. When I was a kid we didn’t have any of this grounding nonsense.

So one and done?

Excellent talk!

EXCELLENT presentation Kristen !!

As I was attending warranty training, we all noticed the heat sink (fin) at chassis ground next to the popular test point (pin) that was at 130v above earth ground. It kept us awake as the class progressed. That was a practical demonstration that "ground" is a relative term.

Why is it that it’s so complicated to renew your license person renew can’t even give me it. Why don’t they make a map for the Fcc to renew your license and make it easier for the person?

Thank you for this great presentation which complete the book grounding and bounding. Please can we get the PDF of this presentation too, to keep as reference on the subject? Thank a lot

The ground has a negative charge . air has the opposite which is positive charge

So is the ARRL insignia a myth?

Great presentation, thank you for sharing.

that person has definitely proven that you can use a different word for something and then explain it in a way that shows it was the same thing as everybody meant when they used the regular word for it.

Excellent Excellent Excellent presentation ! Absolutely enjoyed her presentation ! Thank You !!!

I would say, maybe not a myth but rather it's a question of an ideal ground vs a "real" ground. Like an ideal voltage source, ideal resistor, ideal short circuit, etc. vs their real counterparts. Theory vs practical.

Wow! Finally someone who actually understands. So many people don’t understand.

Now that I know "ground is a myth", I guess I no longer need to waste my time on lightning safety grounding or RF grounds either! Thanks ARRL, you've saved me so much money at my QTH!!

In AC generated current, at the higher voltages, the ground can be used to complete the circuit. But that is not the same as the ground that you have in you home. In your home the earth ground is used mainly to discharge static electrical charges from the devices hooked up to the system or static charges created by lightening electromagnetic discharges transferred into the structure of the building. The fact that the ground doubles as a safety in case the "hot" side of the circuit somehow comes in contact with the metal case of the device being powered does not change that fact. AC current will follow the easiest path back to the transformer, which is the "neutral" side of the circuit and is why the ground and "neutral" wires are bonded in the main distribution panel. Perhaps static charges are why you have grounds on radio circuits. I can easily see how higher powered radios would create static charges that need to be safely discharged into the earth.

A myth? Maybe not but definitely not as finite as it’s made out to be. As I understand it ground is essentially a capacitor that is far too large to be charged meaningfully by the supply voltage. The great benefit of grounding is filtering noise fed back into the line side because RF tends to do funny things to electronics not built for it. Electricity doesn’t just take the shortest path, it takes all paths proportional to their resistance/impedance. The shorter the path to ground, the lower the impedance for that path and a higher current results. The paths that run back through the utilities are higher impedance by comparison to a local ground and so pass a lower current.

Excellent Teaching Observations of the distinction between an arbitary Zero Absolute by definition of circumstances and trivial zeros floating in flat-space ground-state No-thing-defined.

Thanks

An earth ground rod is needed for household electrical circuits to enable the Earth Leakage breaker to trip if you touch an active (live) main wire while for example, you are standing in a puddle of water. As most neutral cables are earthed in the meter box, the current would flow to earth/ ground via your feet to complete a circuit back to the ground rod and hence the neutral at the meter box. This would then cause an inbalance between the active and neutral cables at the Earth Leakage breaker and trip the power, hence quickly preventing you getting a shock. So, in this type of household circuit a ground rod which provides an earth connection is very important to have. A ground fault interrupter doesn't need an earth connection, as the neutral is linked in the meter box to ground, but it does use the ground/ earth to detect a leakage current to earth and trip.

This is an overused word and not understood by most. There area two terms to use instead. One is RETURN for DC and AC circuits. For RF it is the counterpoise or other half of the antenna.

Good job. Thanks for looking at this RFI.

The next thing you know, they'll be rolling out a clickbait title like "the earth's not just flat, it's a cube."

If there is a potential gradient across the ground, there is a cause. It happens over KM+ but it should be negligible over a few meters. Chassis are connected to an earth conductor because humans are likely connected to earth already, so it minimizes potential differences experienced by humans. In the case of fully isolated circuits, like a transformer where one side is mains powered and the other side isn't, there will be no potential difference between conductors on one side to the other. Sadly, if there is a fault, for example a short across the transformer, and a human is touching the "isolated" side, there will suddenly be a large potential across the human. This is why we earth every exposed metal we practically can. Antennae are obvious exceptions.

@21:35 - this PS does not seem to have a 3 prong AC, so the chassis is probably floating and would be dangerous if the "hot" breaks off inside the chassis. Taking that ground screw - connect it to other equipment chassis'. This is not safety - it may be noise reduction. One could (not code compliant) take that ground screw to the outlet ground, and then it would be electrically "safer" but not code or CSA/UL compliant. One could replace the AC with a 3 wire AC and connect the AC ground to the chassis on the INSIDE of the PS (with strain relief). This would be CSA/UL compliant (but not certified). The DC coming out is most likely floating wrt to the chassis ground.

Neutral for homes is how we get 120v from 240v. The center tap is halfway between the full 240 coil, so running a circut through half the coil gives you 120v. Power is going back to its source. Generated power travels through ground back to the generator. "Reference" is relative.

This was fantastic and super useful to me as a new ham. Thank you Kristen!

This explains why some things worked for me at a certain QH and not work at others. I learned by trial and error working out of apartments as well as homes. This pretty well sums up what grounds are all about. Great presentation Kristen.

I think I am in love. There is a reason I run all the ground radials, they work.

Ground is when humans are not being neurotic. it's a reference. It can also be an invisible attractor to even out any difference as becomes apparent depending on the situation. Static, lightning the list goes on. I would avoid ground spread radials and stick with balanced antenna evenly matched and spaced up in the air from earth and other objects. Or. If using radials try to use a solid metal sheet such as a big tin roof, but many radials are almost as good. Ideally you would want to be able to change antenna height above earth for different situations. I guess we could say that ground is halfway between the PD but not always depending on the reason / situation.