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winter project

 

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I am looking for an?SX146/HT46 station. I would prefer a nonfunctioning but complete?and unmodified set.
I intend to write a repair manual for each.
Re: 2-wire, unpolarized outlet ?

 

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Eric, that is another topic, but is very real concern, and requires a different test..

?

From: [email protected] [mailto:[email protected]] On Behalf Of Eric via groups.io
Sent: Sunday, January 5, 2025 9:58 AM
To: [email protected]
Subject: Re: [HallicraftersRadios] 2-wire, unpolarized outlet ?

?

I trust grounded (neutral and grounding) wires even less than "hot" ones. ? If the connections aren't solid, what was cold can, without warning, get "kinda warm" as the loads in the building switch on and off.

?

This happened to me when a refrigerator in another room turned on.? It was in a church/grade school and I barely managed to not provide an example of "words you shouldn't say in front of a nun".?

?

Eric

_._,_._,_


--
don??? va3drl
Re: 2-wire, unpolarized outlet ?

 

I trust grounded (neutral and grounding) wires even less than "hot" ones. ? If the connections aren't solid, what was cold can, without warning, get "kinda warm" as the loads in the building switch on and off.
?
This happened to me when a refrigerator in another room turned on.? It was in a church/grade school and I barely managed to not provide an example of "words you shouldn't say in front of a nun".?
?
Eric
Re: 2-wire, unpolarized outlet ?

 

Since it tells you hot or netral, great. You can never trust what's there until you verify. You never know what someone in the past did. Everyone should check their receptacles to make sure they're wired correctly.
Bob W4JFA?

On Sat, Jan 4, 2025, 1:42 PM Gordon, KJ6IKT via <gfsmith=[email protected]> wrote:
Hi Bob,
Yes, that is exactly the function of the tool. It senses what wire/receptacle slot is hot/has potential on it and what wire/receptacle does not. It can do it even with the wire insulated. I have used it extensively to find out what wires in my house are "hot" and which are neutral. If you have a Romex cable you can even determine which side of it the hot wire is on. It's quite a sensitive tool and I most highly recommend that anyone working with electrical wiring get one.
?
73, Gordon KJ6IKT
?
On Sat, Jan 4, 2025 at 02:51 AM, Bob wrote:
That tool looks good but the op wanted to know which wire is hot and which wire is neutral. Will it do that?
Bob W4JFA?

On Fri, Jan 3, 2025, 9:57 PM Gordon, KJ6IKT via <gfsmith=[email protected]> wrote:
Hi Skip,
What you need is a Non Contact Voltage sensing Tester. Specifically, a Klein Tools NCVT. They come in various configurations. I use an older version of the NCVT2P (Link here: ) and can most highly recommend it. This tester allows you to sense if a wire has a voltage potential on it without it ever drawing any current or you touching a bare wire. It will sense through the insulation and has a tip that you can push into the receptacle slot to see if that particular slot is energize/has power. Please get one, you'll never regret it.
?
This tester was given to all engineering personal in my department on the recommendation of our lead electrician Danny Miller. Danny routinely worked on our equipment hooked directly to the power grid (we had some unique projects where we needed a LOT of power) and is the safest man I've ever met. He used this tester, recommend it and it saved his life one time when the mechanical mechanism of a high power circuit breaker failed and one of the phases was still connected to the grid line feeding it, even though the external breaker indication erroneously showed the breaker to be open. This tester gave him a warning that the circuit was still live.
?
73, Gordon KJ6IKT
?
On Wed, Jan 1, 2025 at 12:50 PM, Waldo Magnuson wrote:
My house was built in 1955 and has several outlets that are unpolarized outlets. If I replace an outlet with a 2-prong polarized outlet (neutral opening larger than the hot opening) how do tell which wire is hot?
Thanks.
Skip Magnuson
Re: 2-wire, unpolarized outlet ?

 

Hi Bob,
Yes, that is exactly the function of the tool. It senses what wire/receptacle slot is hot/has potential on it and what wire/receptacle does not. It can do it even with the wire insulated. I have used it extensively to find out what wires in my house are "hot" and which are neutral. If you have a Romex cable you can even determine which side of it the hot wire is on. It's quite a sensitive tool and I most highly recommend that anyone working with electrical wiring get one.
?
73, Gordon KJ6IKT
?
On Sat, Jan 4, 2025 at 02:51 AM, Bob wrote:

That tool looks good but the op wanted to know which wire is hot and which wire is neutral. Will it do that?
Bob W4JFA?

On Fri, Jan 3, 2025, 9:57 PM Gordon, KJ6IKT via <gfsmith=[email protected]> wrote:
Hi Skip,
What you need is a Non Contact Voltage sensing Tester. Specifically, a Klein Tools NCVT. They come in various configurations. I use an older version of the NCVT2P (Link here: ) and can most highly recommend it. This tester allows you to sense if a wire has a voltage potential on it without it ever drawing any current or you touching a bare wire. It will sense through the insulation and has a tip that you can push into the receptacle slot to see if that particular slot is energize/has power. Please get one, you'll never regret it.
?
This tester was given to all engineering personal in my department on the recommendation of our lead electrician Danny Miller. Danny routinely worked on our equipment hooked directly to the power grid (we had some unique projects where we needed a LOT of power) and is the safest man I've ever met. He used this tester, recommend it and it saved his life one time when the mechanical mechanism of a high power circuit breaker failed and one of the phases was still connected to the grid line feeding it, even though the external breaker indication erroneously showed the breaker to be open. This tester gave him a warning that the circuit was still live.
?
73, Gordon KJ6IKT
?
On Wed, Jan 1, 2025 at 12:50 PM, Waldo Magnuson wrote:
My house was built in 1955 and has several outlets that are unpolarized outlets. If I replace an outlet with a 2-prong polarized outlet (neutral opening larger than the hot opening) how do tell which wire is hot?
Thanks.
Skip Magnuson
Re: 2-wire, unpolarized outlet ?

 

That tool looks good but the op wanted to know which wire is hot and which wire is neutral. Will it do that?
Bob W4JFA?

On Fri, Jan 3, 2025, 9:57 PM Gordon, KJ6IKT via <gfsmith=[email protected]> wrote:
Hi Skip,
What you need is a Non Contact Voltage sensing Tester. Specifically, a Klein Tools NCVT. They come in various configurations. I use an older version of the NCVT2P (Link here: ) and can most highly recommend it. This tester allows you to sense if a wire has a voltage potential on it without it ever drawing any current or you touching a bare wire. It will sense through the insulation and has a tip that you can push into the receptacle slot to see if that particular slot is energize/has power. Please get one, you'll never regret it.
?
This tester was given to all engineering personal in my department on the recommendation of our lead electrician Danny Miller. Danny routinely worked on our equipment hooked directly to the power grid (we had some unique projects where we needed a LOT of power) and is the safest man I've ever met. He used this tester, recommend it and it saved his life one time when the mechanical mechanism of a high power circuit breaker failed and one of the phases was still connected to the grid line feeding it, even though the external breaker indication erroneously showed the breaker to be open. This tester gave him a warning that the circuit was still live.
?
73, Gordon KJ6IKT
?
On Wed, Jan 1, 2025 at 12:50 PM, Waldo Magnuson wrote:
My house was built in 1955 and has several outlets that are unpolarized outlets. If I replace an outlet with a 2-prong polarized outlet (neutral opening larger than the hot opening) how do tell which wire is hot?
Thanks.
Skip Magnuson
Re: 2-wire, unpolarized outlet ?

 

Hi Skip,
What you need is a Non Contact Voltage sensing Tester. Specifically, a Klein Tools NCVT. They come in various configurations. I use an older version of the NCVT2P (Link here: ) and can most highly recommend it. This tester allows you to sense if a wire has a voltage potential on it without it ever drawing any current or you touching a bare wire. It will sense through the insulation and has a tip that you can push into the receptacle slot to see if that particular slot is energize/has power. Please get one, you'll never regret it.
?
This tester was given to all engineering personal in my department on the recommendation of our lead electrician Danny Miller. Danny routinely worked on our equipment hooked directly to the power grid (we had some unique projects where we needed a LOT of power) and is the safest man I've ever met. He used this tester, recommend it and it saved his life one time when the mechanical mechanism of a high power circuit breaker failed and one of the phases was still connected to the grid line feeding it, even though the external breaker indication erroneously showed the breaker to be open. This tester gave him a warning that the circuit was still live.
?
73, Gordon KJ6IKT
?
On Wed, Jan 1, 2025 at 12:50 PM, Waldo Magnuson wrote:

My house was built in 1955 and has several outlets that are unpolarized outlets. If I replace an outlet with a 2-prong polarized outlet (neutral opening larger than the hot opening) how do tell which wire is hot?
Thanks.
Skip Magnuson
Re: 2-wire, unpolarized outlet ?

 

You can install a GFCI without using a bonded ground wire, see:
Regards,
Jim

Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy


On Thursday, January 2, 2025 at 12:24:27 PM CST, don Root <drootofallevil@...> wrote:


Skip, that was me. At one time the code allowed a separate bare? ground wire to be run from a water pipe or whatever ?when having upgrading problems. Don’t quote my wording, but might that work for some outlets?

?

Also, I have yet to find an actual NFPA 70/ 1962 code? book on-line to read for myself.

?

From: [email protected] [mailto:[email protected]] On Behalf Of Waldo Magnuson via groups.io
Sent: Thursday, January 2, 2025 11:34 AM
To: [email protected]
Subject: Re: [HallicraftersRadios] 2-wire, unpolarized outlet ?

?

Thanks guys for the suggestions. ?One suggestion was: ?“You should most likely ?install a 3-wire cable.” But my home (downstairs) is a log home and the 2-conductor wire went in when the logs were placed. ?Upstairs is all code.

Skip


--
don??? va3drl

Re: 2-wire, unpolarized outlet ?

 

开云体育

Skip, that was me. At one time the code allowed a separate bare? ground wire to be run from a water pipe or whatever ?when having upgrading problems. Don’t quote my wording, but might that work for some outlets?

?

Also, I have yet to find an actual NFPA 70/ 1962 code? book on-line to read for myself.

?

From: [email protected] [mailto:[email protected]] On Behalf Of Waldo Magnuson via groups.io
Sent: Thursday, January 2, 2025 11:34 AM
To: [email protected]
Subject: Re: [HallicraftersRadios] 2-wire, unpolarized outlet ?

?

Thanks guys for the suggestions. ?One suggestion was: ?“You should most likely ?install a 3-wire cable.” But my home (downstairs) is a log home and the 2-conductor wire went in when the logs were placed. ?Upstairs is all code.

Skip


--
don??? va3drl
Re: 2-wire, unpolarized outlet ?

 

Hi Skip,

A Polarized, ungrounded, receptacle is readily available e.g. from Home Depot:


And replacing your old Non-polarized ungrounded receptacle with this one meets code:

NEC 406.4 D(2) Non-Grounding-Type Receptacles
Where attachment to an equipment grounding conductor does not exist in the receptacle enclosure, the installation shall comply with 406.4(D)(2) (a), (D)(2) (b), or (D)(2) (c).

? (a) A non-grounding-type receptacle(s) shall be permitted to be replaced with another non-grounding-type receptacle(s).

? (b)A non-grounding-type receptacle(s) shall be permitted to be replaced with a ground-fault circuit interrupter-type of receptacle(s). These receptacles or their cover plates shall be marked "No Equipment Ground." An equipment grounding conductor shall not be connected from the ground-fault circuit-interrupter-type receptacle to any outlet supplied from the ground-fault circuit-interrupter receptacle.

? (c)A non-grounding-type receptacle(s) shall be permitted to be replaced with a grounding-type receptacle(s) where supplied through a ground-fault circuit interrupter. Where grounding-type receptacles are supplied through the ground-fault circuit interrupter, grounding-type receptacles or their cover plates shall be marked "GFCI Protected" and "No Equipment Ground," visible after installation. An equipment grounding conductor shall not be connected between the grounding-type receptacles.

73
Chris
Re: 2-wire, unpolarized outlet ?

 

开云体育

Thanks guys for the suggestions. ?One suggestion was: ?“You should most likely ?install a 3-wire cable.” But my home (downstairs) is a log home and the 2-conductor wire went in when the logs were placed. ?Upstairs is all code.
Skip
Re: 2-wire, unpolarized outlet ?

 

That's why I said temporarily wire it up.
Bob W4JFA?

On Thu, Jan 2, 2025, 10:55 AM Bob via <W4JFABob=[email protected]> wrote:
You have to use an adapter or wire it direct.
Bob W4JFA?

On Wed, Jan 1, 2025, 10:02 PM don Root via <drootofallevil=[email protected]> wrote:

Will it fit into an old 2prong outlet???

?

From: [email protected] [mailto:[email protected]] On Behalf Of Bob via
Sent: Wednesday, January 1, 2025 6:26 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] 2-wire, unpolarized outlet ?

?

Temporarily wire up one of these...
Bob W4JFA?

?

,_


--
don??? va3drl

Re: 2-wire, unpolarized outlet ?

 

You have to use an adapter or wire it direct.
Bob W4JFA?

On Wed, Jan 1, 2025, 10:02 PM don Root via <drootofallevil=[email protected]> wrote:

Will it fit into an old 2prong outlet???

?

From: [email protected] [mailto:[email protected]] On Behalf Of Bob via
Sent: Wednesday, January 1, 2025 6:26 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] 2-wire, unpolarized outlet ?

?

Temporarily wire up one of these...
Bob W4JFA?

?

,_


--
don??? va3drl

Re: SR-150 PWR Supply

 
Edited

If the GFCI disconnects a radio or similar appliance from the AC line voltage then there is a problem with a leakage current that is forming an alternate path for the line current.? A properly working GFCI will trip when there is approximately a 5 mA difference between the current carried in the "hot" conductor and the current carried in the "neutral" conductor.??

Any capacitor connected between either the hot, common or both to the chassis in the radio should be sized so that the maximum current allowed to flow is below the 5 mA trip point of the GFCI.? In every radio I have worked on that tripped a GFCI, I found a faulty AC line bypass capacitor.? I suppose a faulty power transformer would also do the same thing but I guess I have been lucky in that the leakage was always caused by a faulty AC line to chassis bypass capacitor.

In and earlier post I said that the GFCI trip current was 15 mA but my memory was in error, it is actually around 5 mA.? It seems that 1 mA is the tingle threshold of feeling the flow of current for the average person.? Above 5 mA is a painful feeling and above 25 mA is the loss of muscle control.? Above 50 mA there is a real problem.? See:??

My understanding of the NEC is that the third conductor, ground, is not supposed to carry any current so there is no voltage drop in this wire.? The neutral conductor and the ground conductor are bonded together at the distribution panel.? As to where the NEC code ends, some professional electricians say at the outlet, others say beyond and into the equipment plugged into the outlet.? The answer to this is beyond my understanding if the professionals cannot agree!??

But I do think that the Underwriters Laboratory (UL) is the agency that issues the requirements and does the testing for appliances plugged into an outlet.? If the radio has received the UL label, then it has met the UL requirements at the time it was tested.? Of course I understand that those requirements have changed over time.??

I do not know if the UL has changed it's position on switching the neutral line as was done in AA5 radios.? AFAIK the AA5 was designed as an insulated appliance with the outside cabinet shielding anyone from contact with a hot chassis.? Any shock that one gets from touching an antenna or other terminal is caused by the AC line to chassis bypass capacitor.? Below 5 mA is a nuisance but not lethal as is suggested by at least one sensationally done YouTube video.

Using a polarized plug will guarantee that the AA5 chassis will be at or near ground potential, assuming that the outlet was properly installed.? In researching this note, I found that AI is mistaken when it mentions the date of 1962 for when the polarized plug was developed.? Per????The following was found:

"Many of the safety requirements for extension cords predate the existence of the CPSC, (Consumer Product Safety Commission).? For example, CPSC staff believes that UL incorporated requirements for polarized (and grounded) plugs and receptacles on cord sets around 1962.? A search by CPSC staff found that grounded plugs were developed as early as 1911, and polarized plugs became available in 1914.? The National Electrical Code (“NEC”) adopted requirements for polarized electrical outlets in 1948 and for grounded 120-volt receptacles in 1962.? Since 1987, UL 817 has addressed the identified, readily observable characteristics that are included in the rule (minimum wire size, sufficient strain relief, proper polarization, proper continuity, outlet covers for indoor cords, and jacketed cords for outdoor extension cords).
Just another opinion,
Jim
Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy


On Tuesday, December 31, 2024 at 09:35:36 PM CST, Dave Jordan via groups.io <wa3gin@...> wrote:


Haha, I wondered about both and not worried about it!?I hate GFIs and all the other?rip-offs EATON?and HomeDespot have devised to extract my money from my pocket.? I'm trying to adapt to having pink cerromax in the ham shack!
?
Ungrounded two-prong outlets are typically only found in older homes.?Since 1962, the National Electric Code (NEC) has prohibited them in new construction?to minimize the risk of electric shock and electrical equipment damage.?

I'd bet Hallicrafters had the design for the SR-150 on the drawing board long before 1962.?

Best,
dave
wa3gin



On Tue, Dec 31, 2024 at 9:56?PM don Root via <drootofallevil=[email protected]> wrote:

Well Dave. if in 1963 you had? one slot smaller than the other, you were ahead of the game; the house I am in [1956] was all non polarized, except for the Garage, washing machine and outdoor outlets.

?

The drawing indicates nothing about any polarity for the PS 150.?

if I were putting a new 2 wire polarized plug ?and cord and on one, ?the hot would go to the fuse as you mentioned ?.

?

of course the chassis/cabinet will tend to float at ?some ?midway voltage due to the ?two 1400 volt line caps connect to ground also, just as before

?

I would have a little dilemma ?if I were putting a ?new 3 wire ?plug ?and cord on one, as where would the ground wire go? Other than the chasses?

But then it would connect? Neutral to ground, and that would defeat the intent of the NEC code ?and GFCI on that circuit.? ?

?

enddd

From: [email protected] [mailto:[email protected]] On Behalf Of Dave Jordan via
Sent: Tuesday, December 31, 2024 8:14 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] SR-150 PWR Supply

?

Ok, but for me during my ham years starting in 1963 the smaller of the two socket openings was always hot. The smooth side of the cord was always hot as well.?

?

Funny how time seems to change things…but those standards remain the same even today.?

?

Happy New Year

Dave

Wa3gin

?


--
don??? va3drl


_._,_._,_
Re: 2-wire, unpolarized outlet ?

 

开云体育

Will it fit into an old 2prong outlet???

?

From: [email protected] [mailto:[email protected]] On Behalf Of Bob via groups.io
Sent: Wednesday, January 1, 2025 6:26 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] 2-wire, unpolarized outlet ?

?

Temporarily wire up one of these...
Bob W4JFA?

?

,_


--
don??? va3drl
Re: 2-wire, unpolarized outlet ?

 

开云体育

Jerry, you must be a one-half capacitor! ????What in invention!

?

From: [email protected] [mailto:[email protected]] On Behalf Of Jerry Miel via groups.io
Sent: Wednesday, January 1, 2025 6:15 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] 2-wire, unpolarized outlet ?

?

Here is what I do.? Use a voltmeter on the AC voltage range.? Hold one lead in you hand and stick the other lead in the socket.? The low side will be essentially zero.? The high side will show some voltage, like 47 volts.? The voltmeter is a high impedance between you and the electric line and your body is another high impedance to ground.? I have often used this method and lived to tell about it.? Never felt a tingle.? Caution, make sure you are on a voltage setting, not a current setting.

Jerry, W6XL

On 1/1/2025 3:03 PM, don Root via groups.io wrote:

Skip, The codes said for a long time neutral is the white wire? and hot is the black wire. You can check that by using a meter connected to a copper water line where the hot should be 120 and neutral = nothing [maybe needing a very long wire to reach the water line ] ?but? if the wiring has no ground wire? things get messy as the an ungrounded polarized receptacle is likely hard to get.? You should most likely ?install a 3-wire cable. I am too far out of date to know what the codes allow now when updating older houses.

?

From: [email protected] [mailto:[email protected]] On Behalf Of Waldo Magnuson via groups.io
Sent: Wednesday, January 1, 2025 3:51 PM
To: [email protected]
Subject: [HallicraftersRadios] 2-wire, unpolarized outlet ?

?

My house was built in 1955 and has several outlets that are unpolarized outlets. If I replace an outlet with a 2-prong polarized outlet (neutral opening larger than the hot opening) how do tell which wire is hot?
Thanks.
Skip Magnuson


--
don??? va3drl

?


--
don??? va3drl
Re: 2-wire, unpolarized outlet ?

 
Edited

Temporarily wire up one of these...



Bob W4JFA?

On Wed, Jan 1, 2025, 6:14 PM Jerry Miel via <jmiel=[email protected]> wrote:

Here is what I do.? Use a voltmeter on the AC voltage range.? Hold one lead in you hand and stick the other lead in the socket.? The low side will be essentially zero.? The high side will show some voltage, like 47 volts.? The voltmeter is a high impedance between you and the electric line and your body is another high impedance to ground.? I have often used this method and lived to tell about it.? Never felt a tingle.? Caution, make sure you are on a voltage setting, not a current setting.

Jerry, W6XL

On 1/1/2025 3:03 PM, don Root via wrote:

Skip, The codes said for a long time neutral is the white wire? and hot is the black wire. You can check that by using a meter connected to a copper water line where the hot should be 120 and neutral = nothing [maybe needing a very long wire to reach the water line ] ?but? if the wiring has no ground wire? things get messy as the an ungrounded polarized receptacle is likely hard to get.? You should most likely ?install a 3-wire cable. I am too far out of date to know what the codes allow now when updating older houses.

?

From: [email protected] [mailto:[email protected]] On Behalf Of Waldo Magnuson via
Sent: Wednesday, January 1, 2025 3:51 PM
To: [email protected]
Subject: [HallicraftersRadios] 2-wire, unpolarized outlet ?

?

My house was built in 1955 and has several outlets that are unpolarized outlets. If I replace an outlet with a 2-prong polarized outlet (neutral opening larger than the hot opening) how do tell which wire is hot?
Thanks.
Skip Magnuson


--
don??? va3drl

Re: 2-wire, unpolarized outlet ?

 

开云体育

Here is what I do.? Use a voltmeter on the AC voltage range.? Hold one lead in you hand and stick the other lead in the socket.? The low side will be essentially zero.? The high side will show some voltage, like 47 volts.? The voltmeter is a high impedance between you and the electric line and your body is another high impedance to ground.? I have often used this method and lived to tell about it.? Never felt a tingle.? Caution, make sure you are on a voltage setting, not a current setting.

Jerry, W6XL

On 1/1/2025 3:03 PM, don Root via groups.io wrote:

Skip, The codes said for a long time neutral is the white wire? and hot is the black wire. You can check that by using a meter connected to a copper water line where the hot should be 120 and neutral = nothing [maybe needing a very long wire to reach the water line ] ?but? if the wiring has no ground wire? things get messy as the an ungrounded polarized receptacle is likely hard to get.? You should most likely ?install a 3-wire cable. I am too far out of date to know what the codes allow now when updating older houses.

?

From: [email protected] [mailto:[email protected]] On Behalf Of Waldo Magnuson via groups.io
Sent: Wednesday, January 1, 2025 3:51 PM
To: [email protected]
Subject: [HallicraftersRadios] 2-wire, unpolarized outlet ?

?

My house was built in 1955 and has several outlets that are unpolarized outlets. If I replace an outlet with a 2-prong polarized outlet (neutral opening larger than the hot opening) how do tell which wire is hot?
Thanks.
Skip Magnuson


--
don??? va3drl

Re: SR-150 PWR Supply

 

Jack
I seem to have missed the comment by Walter Cates on 60 cycle hum on TX.? Can you tell me the message date or message number so that I can refresh my memory?

If the GFCI is tripping then there is an imbalance of current between the common and hot leads of the line cord.? The GFCI is doing it's job in detecting this imbalance.? There is a leakage path there, possibly through the station ground?
Regards,
Jim

Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy


On Wednesday, January 1, 2025 at 10:30:56 AM CST, Jack Brabham - KZ5A via groups.io <kz5a.jack@...> wrote:


I just finished a complete rebuild on my? PS 150-120.? I choose to stay with a 2 prong polarized power cord mostly due to Walter Cates recommendation to avoid 60hz hum on the TX.? ?Didn't see why at first but I think I've codgertated it out.? ?The TRX? and PS were designed together and? the TX is intended to be the common signal ground point for both.? With? a 2? prong polarized plug and cord this works fine but will not support a GFI.? ?
?
If you add? a? 3 prong? cord to? the PS the 60hz current passed? by C201 and C202 appears on the electrical Ground and can be passed to the electrical Common via the main AC breaker box? where the 2 are terminated to the same buss.? ?This can appear as a 60hz potential between a station RF ground and the electrical Common which apparently can find it's way into the TX audio.
?
This is no doubt highly situational depending? on house and station wiring.? ?If you use a 3 prong AC cord and encounter the hum, deleting C201 and C202 might fix it.? Also the 60hz current passed onto the electrical Ground by the capacitors? could? trip a GFI considering that is the current they are intended to sense.??
?
A ferrite on the power cord can functionally? replace? the caps.
?
73 Jack KZ5A
?
?
?
Re: 2-wire, unpolarized outlet ?

 

开云体育

Skip, The codes said for a long time neutral is the white wire? and hot is the black wire. You can check that by using a meter connected to a copper water line where the hot should be 120 and neutral = nothing [maybe needing a very long wire to reach the water line ] ?but? if the wiring has no ground wire? things get messy as the an ungrounded polarized receptacle is likely hard to get.? You should most likely ?install a 3-wire cable. I am too far out of date to know what the codes allow now when updating older houses.

?

From: [email protected] [mailto:[email protected]] On Behalf Of Waldo Magnuson via groups.io
Sent: Wednesday, January 1, 2025 3:51 PM
To: [email protected]
Subject: [HallicraftersRadios] 2-wire, unpolarized outlet ?

?

My house was built in 1955 and has several outlets that are unpolarized outlets. If I replace an outlet with a 2-prong polarized outlet (neutral opening larger than the hot opening) how do tell which wire is hot?
Thanks.
Skip Magnuson


--
don??? va3drl
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