RF police
Daniel Kunkel,
FCC allows you to transmit 0.1 watts.
Dick
-----Original Message-----
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To: tesla@xxxxxxxxxx
Subject: Tesla Digest, Vol 141, Issue 4
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Today's Topics:
1. Re: Need capacitors (Douglas Johnson)
2. The RF Police (Daniel Kunkel)
3. Re: The RF Police (jimlux)
4. Fwd: The RF Police (Jay Howson)
5. Re: The RF Police (Steve White)
6. Re: The RF Police (Daniel Kunkel)
7. PFC Cap Bank (Daniel Kunkel)
8. Re: The RF Police (John Darwin Powers)
9. Re: The RF Police (jimlux)
10. Re: The RF Police (Steve White)
11. Re: The RF Police (Jay Howson)
12. Re: PFC Cap Bank (Steve White)
13. Re: The RF Police (Steve White)
14. Re: The RF Police (jimlux)
15. Re: PFC Cap Bank (David Rieben)
----------------------------------------------------------------------
Message: 1
Date: Wed, 28 Aug 2019 08:14:38 -0400
From: Douglas Johnson <doug379306@xxxxxxxxx>
To: undisclosed recipient <arcin_n_sparkin@xxxxxxxxx>, Tesla Coil
Mailing List <tesla@xxxxxxxxxx>
Subject: Re: [TCML] Need capacitors
Message-ID:
<CAD=mYbPAEuLdmnbVoyqg7LQDttwjLCf1hc8ZSAzV2NSDYSKtjw@xxxxxxxxxxxxxx>
Content-Type: text/plain; charset="UTF-8"
I have 2 MMC's made with 15 each of these Caps, never had a problem with
them.
On Tue, Aug 27, 2019 at 7:20 PM undisclosed recipient via Tesla <
tesla@xxxxxxxxxx> wrote:
> There are these little caps from IU aka amazing1 .15ufd at 2KVAC
> Metallized Polypropylene Film Foil Capacitor
> I tried these 4 years ago and let the magic smoke out of a couple?(I think
> I was short one or two) for my 12kV primaries.
> If allowed I can post the info sent to me a week or so ago.
>
> > On Aug 27, 2019, at 13:22, Thomas Shurtz via Tesla <tesla@xxxxxxxxxx>
> wrote:
> >
> > I did see some similar GTO snubber film caps made by Vishay on ebay
> recently. Haven't seen any of the Eurofarad ones for quite some time now.
> > Thomas
> > On Tuesday, August 27, 2019, 12:23:22 PM CDT, Bert Hickman <
> bert@xxxxxxxxxxxxxxxxxxxxx> wrote:
> >
> > These are high-current (152 Amps RMS at 580 Volts RMS) self-healing
> > polypropylene metalized-film-foil snubber capacitors. Ideal for primary
> > circuits in solid state Tesla coils when stacked in series. A good
> > discussion about this particular cap can be found here on the 4hv list:
> >
> > https://4hv.org/e107_plugins/forum/forum_viewtopic.php?123061.post
> >
> > Bert
> >
> > Allen Bishop via Tesla wrote:
> >> Whatever for? Those are starting motor caps and surely would never work
> as a capacitor string for the primary of a Tesla coil.
> >> Allen BishopColorado Springs
> >>
> >>
> >> -----Original Message-----
> >> From: Brian Decosta <briandecosta38305@xxxxxxxxx>
> >> To: Tesla Mailing List <Tesla@xxxxxxxxxx>
> >> Sent: Tue, Aug 27, 2019 5:20 am
> >> Subject: [TCML] Need capacitors
> >>
> >>
> >> Does anyone on the list have any SP2550-2 Eurofarad 3.75 uF 580V RMS
> caps that they are not using? If so I need about 10 of them.
> >>
> >> Thanks
> >>
> >> Brian
> >>
> >> Sent from my iPhone
> >> _______________________________________________
> >> Tesla mailing list
> >> Tesla@xxxxxxxxxxxxxxxxxx
> >> https://www.pupman.com/mailman/listinfo/tesla
> >> _______________________________________________
> >> Tesla mailing list
> >> Tesla@xxxxxxxxxxxxxxxxxx
> >> https://www.pupman.com/mailman/listinfo/tesla
> >>
> >
> >
> > _______________________________________________
> > Tesla mailing list
> > Tesla@xxxxxxxxxxxxxxxxxx
> > https://www.pupman.com/mailman/listinfo/tesla
> >
> > _______________________________________________
> > Tesla mailing list
> > Tesla@xxxxxxxxxxxxxxxxxx
> > https://www.pupman.com/mailman/listinfo/tesla
>
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxxxxxxxxxx
> https://www.pupman.com/mailman/listinfo/tesla
>
------------------------------
Message: 2
Date: Wed, 28 Aug 2019 14:18:43 -0500
From: Daniel Kunkel <dankunkel@xxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: [TCML] The RF Police
Message-ID:
<CAA7NYCfSZBJ171xty98YtwZRDx5OM8B37+SDU_=hagGC4F6UrA@xxxxxxxxxxxxxx>
Content-Type: text/plain; charset="UTF-8"
I am currently working on a pig powered magnifier. I am wondering at what
power levels do I need to be concerned with RF interference and (USA)
Federal Laws and entities getting angry. I don't plan on going over 10KVA.
The good news is, I live out in the country. The bad news is, I live 2.5
miles (as the RF crow flies) away from a military base. And in between my
house and the base, is an off base facility 1.2 miles away (as the RF crow
flies). I believe it is a training center, but there are many antennas and
my radar detector goes crazy there, so I know there is some sort of comm
link between the base and the building.
Advice?
~Dan
Kansas City area
------------------------------
Message: 3
Date: Wed, 28 Aug 2019 15:58:31 -0700
From: jimlux <jimlux@xxxxxxxxxxxxx>
To: tesla@xxxxxxxxxxxxxxxxxx
Subject: Re: [TCML] The RF Police
Message-ID: <408aec5a-3f52-8ae6-2898-2a21417b889f@xxxxxxxxxxxxx>
Content-Type: text/plain; charset=utf-8; format=flowed
On 8/28/19 12:18 PM, Daniel Kunkel wrote:
> I am currently working on a pig powered magnifier. I am wondering at what
> power levels do I need to be concerned with RF interference and (USA)
> Federal Laws and entities getting angry. I don't plan on going over 10KVA.
>
> The good news is, I live out in the country. The bad news is, I live 2.5
> miles (as the RF crow flies) away from a military base. And in between my
> house and the base, is an off base facility 1.2 miles away (as the RF crow
> flies). I believe it is a training center, but there are many antennas and
> my radar detector goes crazy there, so I know there is some sort of comm
> link between the base and the building.
>
> Advice?
fortunately, tesla coils are terrible antennas.. So you're not an
"intentional radiator" for which damped wave emissions are prohibited.
Basically, if you interfere, and someone complains, you have to turn it
off.
Part 15:
? 15.5 General conditions of operation.
(a) Persons operating intentional or unintentional radiators shall not
be deemed to have any vested or recognizable right to continued use of
any given frequency by virtue of prior registration or certification of
equipment, or, for power line carrier systems, on the basis of prior
notification of use pursuant to ? 90.35(g) of this chapter.
(b)Operation of an intentional, unintentional, or incidental radiator is
subject to the conditions that no harmful interference is caused and
that interference must be accepted that may be caused by the operation
of an authorized radio station, by another intentional or unintentional
radiator, by industrial, scientific and medical (ISM) equipment, or by
an incidental radiator.
(c) The operator of a radio frequency device shall be required to cease
operating the device upon notification by a Commission representative
that the device is causing harmful interference. Operation shall not
resume until the condition causing the harmful interference has been
corrected.
(d)Intentional radiators that produce Class B emissions (damped wave)
are prohibited.
But, should you want to go further and see if you WOULD be compliant
https://www.law.cornell.edu/cfr/text/47/part-15/subpart-B
you're not marketing, so you don't need an authorization (Supplier's
Documentation of Conformity or certification) called out in 15.101
You're probably not in the 15.103 exempted devices, although conceivably
you could fit in (c) digital device used in test equipment..
Your radiated emission limits are easy: it starts at 30 MHz, and you're
probably not emitting more than 100 microvolts/meter at 30 Mhz and above.
Frequency of emission (MHz) Field strength (microvolts/meter)
30-88 100
88-216 150
216-960 200
Above 960 500
Just to add:
? 15.23 Home-built devices.
(a) Equipment authorization is not required for devices that are not
marketed, are not constructed from a kit, and are built in quantities of
five or less for personal use.
(b) It is recognized that the individual builder of home-built equipment
may not possess the means to perform the measurements for determining
compliance with the regulations. In this case, the builder is expected
to employ good engineering practices to meet the specified technical
standards to the greatest extent practicable. The provisions of ? 15.5
apply to this equipment.
------------------------------
Message: 4
Date: Wed, 28 Aug 2019 19:30:27 -0400
From: Jay Howson <jhowson4@xxxxxxxxxxx>
To: TCML tesla Coil Mailing List <tesla@xxxxxxxxxx>
Subject: [TCML] Fwd: The RF Police
Message-ID: <mailman.1172.1567117688.1143.tesla@xxxxxxxxxxxxxxxxxx>
Content-Type: text/plain; charset=utf-8
I live about 300 yards from a military air base, thus far no complaints
about my >10kva coil being operated.Jay
-------- Original message --------From: Daniel Kunkel <dankunkel@xxxxxxxxx>
Date: 8/28/19 3:18 PM (GMT-05:00) To: Tesla list <tesla@xxxxxxxxxx>
Subject: [TCML]? The RF Police I am currently working on a pig powered
magnifier. I am wondering at whatpower levels do I need to be concerned with
RF interference and (USA)Federal Laws and entities getting angry. I don't
plan on going over 10KVA.The good news is, I live out in the country. The
bad news is, I live 2.5miles (as the RF crow flies) away from a military
base. And in between myhouse and the base, is an off base facility 1.2 miles
away (as the RF crowflies). I believe it is a training center, but there are
many antennas andmy radar detector goes crazy there, so I know there is some
sort of commlink between the base and the building.Advice?~DanKansas City
area_______________________________________________Tesla mailing
listTesla@tedward.pupman.comhttps://www.pupman.com/mailman/listinfo/tesla
------------------------------
Message: 5
Date: Wed, 28 Aug 2019 20:48:55 -0400 (EDT)
From: Steve White <steve.white1@xxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Subject: Re: [TCML] The RF Police
Message-ID:
<1210244326.169904625.1567039735690.JavaMail.zimbra@xxxxxxxxx>
Content-Type: text/plain; charset=utf-8
Hello Dan,
Tesla coils are not generally operated very often. I only run mine a few
times per year. Even if you were interfering, it would take a while to
marshal the resources to detect and find you because it is so infrequent. I
am not near any military base but I live within 1/4 mile of a large
aerospace company who manufactures and tests a lot of radio equipment both
civilian and military covering frequencies ranging from 2 MHz through
several GHz. I have never had a complaint about RF emissions. Now if you
were operating it daily for extended periods then there might be some reason
for concern. Other than that, I say that you shouldn't worry about it. Just
fire it up.
Steve White
Cedar Rapids, Iowa
----- Original Message -----
From: "Daniel Kunkel" <dankunkel@xxxxxxxxx>
To: "Tesla list" <tesla@xxxxxxxxxx>
Sent: Wednesday, August 28, 2019 2:18:43 PM
Subject: [TCML] The RF Police
I am currently working on a pig powered magnifier. I am wondering at what
power levels do I need to be concerned with RF interference and (USA)
Federal Laws and entities getting angry. I don't plan on going over 10KVA.
The good news is, I live out in the country. The bad news is, I live 2.5
miles (as the RF crow flies) away from a military base. And in between my
house and the base, is an off base facility 1.2 miles away (as the RF crow
flies). I believe it is a training center, but there are many antennas and
my radar detector goes crazy there, so I know there is some sort of comm
link between the base and the building.
Advice?
~Dan
Kansas City area
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxxxxxxxxxx
https://www.pupman.com/mailman/listinfo/tesla
------------------------------
Message: 6
Date: Thu, 29 Aug 2019 07:44:09 -0500
From: Daniel Kunkel <dankunkel@xxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Subject: Re: [TCML] The RF Police
Message-ID:
<CAA7NYCdNjfOhQizr+p_h8vxGYNiz6AVRo8KXrygX9z+oP9W_0A@xxxxxxxxxxxxxx>
Content-Type: text/plain; charset="UTF-8"
Jim Lux: can you be my lawyer?
Jay: how loud is it by your house?
Steve: true they are not operated very often, but I can see my first
light/tuning session being a long one while I work out the kinks, maybe
even over an entire weekend.
Thanks for all the replies everyone! I guess I should go above and beyond
10KVA now just to find out where that pain point is hahaha!
~Dan
------------------------------
Message: 7
Date: Thu, 29 Aug 2019 07:51:02 -0500
From: Daniel Kunkel <dankunkel@xxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: [TCML] PFC Cap Bank
Message-ID:
<CAA7NYCcFuQY8HvbPSsOq4jh=sUmyueKO5Ch-f1BMeDu+MLLezg@xxxxxxxxxxxxxx>
Content-Type: text/plain; charset="UTF-8"
I am building a power supply cabinet to handle my next build and I would
like to incorporate a gang of PFC caps with switches to be able to enable
them at will.
Specs:
Supply current will be 240VAC @ 25amps
PFC will be 276uF according to JavaTC
Questions:
1) I need to buy some switches but I am not sure how robust they need to
be. How much current will the switches actually need to handle?
2) My assumption is that I should not turn the switches on/off while the
coil is running. True?
Thanks,
~Dan
Kansas City area
------------------------------
Message: 8
Date: Thu, 29 Aug 2019 15:34:44 +0000
From: John Darwin Powers <jdp3@xxxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Subject: Re: [TCML] The RF Police
Message-ID: <16D567B6-FA26-4B3A-81FC-13280ABFFA2B@xxxxxxxxxxx>
Content-Type: text/plain; charset="Windows-1252"
RF police.
?.. find the nearest amateur radio operator ?.. ARRL could help, would be
very happy to help ?.. Extra Class if possible, or contact the local radio
group. You can always contact the local FCC field office, and I am sure
that they would be curious and more than happy to take a measure. I would
probably not call the military to ask their opinion as everything is
probably a bad thing, and you house would be surrounded by very large Abrams
tanks and destroy your lawn, well you get the picture.
On Aug 29, 2019, at 8:44 09AMEDT, Daniel Kunkel <dankunkel@xxxxxxxxx> wrote:
> Jim Lux: can you be my lawyer?
> Jay: how loud is it by your house?
> Steve: true they are not operated very often, but I can see my first
> light/tuning session being a long one while I work out the kinks, maybe
> even over an entire weekend.
>
> Thanks for all the replies everyone! I guess I should go above and beyond
> 10KVA now just to find out where that pain point is hahaha!
> ~Dan
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxxxxxxxxxx
> https://www.pupman.com/mailman/listinfo/tesla
------------------------------
Message: 9
Date: Thu, 29 Aug 2019 06:59:35 -0700
From: jimlux <jimlux@xxxxxxxxxxxxx>
To: tesla@xxxxxxxxxxxxxxxxxx
Subject: Re: [TCML] The RF Police
Message-ID: <b81f9ba4-6d13-9dd3-981f-17761f687798@xxxxxxxxxxxxx>
Content-Type: text/plain; charset=utf-8; format=flowed
On 8/29/19 5:44 AM, Daniel Kunkel wrote:
> Jim Lux: can you be my lawyer?
> Jay: how loud is it by your house?
> Steve: true they are not operated very often, but I can see my first
> light/tuning session being a long one while I work out the kinks, maybe
> even over an entire weekend.
I have never heard of anyone, ever, hearing from the FCC about a tesla
coil. You're much more likely to hear from the constabulary about noise.
>
> Thanks for all the replies everyone! I guess I should go above and beyond
> 10KVA now just to find out where that pain point is hahaha!
That is, in fact, a decent goal. 1 MVA is a nice round number.
> ~Dan
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxxxxxxxxxx
> https://www.pupman.com/mailman/listinfo/tesla
>
------------------------------
Message: 10
Date: Thu, 29 Aug 2019 09:50:47 -0400 (EDT)
From: Steve White <steve.white1@xxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Subject: Re: [TCML] The RF Police
Message-ID:
<1758914936.171589009.1567086647119.JavaMail.zimbra@xxxxxxxxx>
Content-Type: text/plain; charset=utf-8
Dan,
You may get lucky. My big coil worked the first time I switched it on from
the suggested tap point of JAVATC. It only required minor re-tuning. It took
maybe a total of 30 minutes with only a small fraction of that time actually
in operation.
Steve White
Cedar Rapids, Iowa
----- Original Message -----
From: "Daniel Kunkel" <dankunkel@xxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Thursday, August 29, 2019 7:44:09 AM
Subject: Re: [TCML] The RF Police
Jim Lux: can you be my lawyer?
Jay: how loud is it by your house?
Steve: true they are not operated very often, but I can see my first
light/tuning session being a long one while I work out the kinks, maybe
even over an entire weekend.
Thanks for all the replies everyone! I guess I should go above and beyond
10KVA now just to find out where that pain point is hahaha!
~Dan
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxxxxxxxxxx
https://www.pupman.com/mailman/listinfo/tesla
------------------------------
Message: 11
Date: Thu, 29 Aug 2019 10:04:24 -0400
From: Jay Howson <jhowson4@xxxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Subject: Re: [TCML] The RF Police
Message-ID: <mailman.1173.1567117688.1143.tesla@xxxxxxxxxxxxxxxxxx>
Content-Type: text/plain; charset=utf-8
Annoyingly loud, especially when they basically buzz our house and the kids
are asleep.? -.-?Thankfully I'm also buffered by some woods, so prying eyes
cant see me run the coil though.?Jay Howson
-------- Original message --------From: Daniel Kunkel <dankunkel@xxxxxxxxx>
Date: 8/29/19 8:44 AM (GMT-05:00) To: Tesla Coil Mailing List
<tesla@xxxxxxxxxx> Subject: Re: [TCML] The RF Police Jim Lux: can you be my
lawyer?Jay: how loud is it by your house?Steve: true they are not operated
very often, but I can see my firstlight/tuning session being a long one
while I work out the kinks, maybeeven over an entire weekend.Thanks for all
the replies everyone! I guess I should go above and beyond10KVA now just to
find out where that pain point is
hahaha!~Dan_______________________________________________Tesla mailing
listTesla@tedward.pupman.comhttps://www.pupman.com/mailman/listinfo/tesla
------------------------------
Message: 12
Date: Thu, 29 Aug 2019 10:19:42 -0400 (EDT)
From: Steve White <steve.white1@xxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Subject: Re: [TCML] PFC Cap Bank
Message-ID:
<1332894110.171647268.1567088382252.JavaMail.zimbra@xxxxxxxxx>
Content-Type: text/plain; charset=utf-8
Dan,
I use standard 10 amp toggle switches. Lets assume that 30% of the current
is flowing through the PFC bank. That would be about 7.5 amps. If that
current is now divided between 3 capacitors (100 + 100 + 50 for example) in
parallel, then each capacitor only has to handle 7.5/3 = 2.5 amps. With one
switch per capacitor, that is easily handled by a standard 10 amp toggle
switch. Even when you only have one capacitor switched in, it will only have
7.5 amps flowing through it. If you really want to be conservative just take
a 10 amp DPST switch and wire the 2 poles in parallel to make a 20 amp
toggle switch.
I assume that you also want a master switch to enable/disable PFC. Even
though a 10 amp switch should still suffice, I would use a 20 amp switch.
DPST 10 amp toggle switches are readily available at Menards or other
similar store. Just connect the 2 poles in parallel to get a 20 amp switch.
You should not enable/disable the PFC bank while in operation nor should you
switch in/out capacitors while in operation.
One item that I wish that I would have added is an amp meter connected in
series with the PFC bank. This would tell me exactly how much current is
flowing through the PFC bank.
FYI, my 6.5 KVA coil (240 volts at 27 amps) needed 200 uF of PFC capacitance
which is pretty close to what you think that you need. My adjustment
granularity is only 50 uF because I use 100 uF and 50 uF capacitors in my
PFC bank.
You probably already know this but PFC does not reduce your energy
consumption. It won't make the streamers any longer. I use it to minimize
the load on my circuit breakers in the distribution panel so that I can run
closer to the load limit without ripping the breaker.
Steve White
Cedar Rapids, Iowa
----- Original Message -----
From: "Daniel Kunkel" <dankunkel@xxxxxxxxx>
To: "Tesla list" <tesla@xxxxxxxxxx>
Sent: Thursday, August 29, 2019 7:51:02 AM
Subject: [TCML] PFC Cap Bank
I am building a power supply cabinet to handle my next build and I would
like to incorporate a gang of PFC caps with switches to be able to enable
them at will.
Specs:
Supply current will be 240VAC @ 25amps
PFC will be 276uF according to JavaTC
Questions:
1) I need to buy some switches but I am not sure how robust they need to
be. How much current will the switches actually need to handle?
2) My assumption is that I should not turn the switches on/off while the
coil is running. True?
Thanks,
~Dan
Kansas City area
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxxxxxxxxxx
https://www.pupman.com/mailman/listinfo/tesla
------------------------------
Message: 13
Date: Thu, 29 Aug 2019 13:57:28 -0400 (EDT)
From: Steve White <steve.white1@xxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Subject: Re: [TCML] The RF Police
Message-ID:
<196461311.172283331.1567101448737.JavaMail.zimbra@xxxxxxxxx>
Content-Type: text/plain; charset=utf-8
I think it would be a huge mistake to ask any authorities for "help". This
will alert them to your presence and possibly put you on their watch list.
Steve White
Cedar Rapids, Iowa
----- Original Message -----
From: "John Darwin Powers" <jdp3@xxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Thursday, August 29, 2019 10:34:44 AM
Subject: Re: [TCML] The RF Police
RF police.
?.. find the nearest amateur radio operator ?.. ARRL could help, would be
very happy to help ?.. Extra Class if possible, or contact the local radio
group. You can always contact the local FCC field office, and I am sure
that they would be curious and more than happy to take a measure. I would
probably not call the military to ask their opinion as everything is
probably a bad thing, and you house would be surrounded by very large Abrams
tanks and destroy your lawn, well you get the picture.
On Aug 29, 2019, at 8:44 09AMEDT, Daniel Kunkel <dankunkel@xxxxxxxxx> wrote:
> Jim Lux: can you be my lawyer?
> Jay: how loud is it by your house?
> Steve: true they are not operated very often, but I can see my first
> light/tuning session being a long one while I work out the kinks, maybe
> even over an entire weekend.
>
> Thanks for all the replies everyone! I guess I should go above and beyond
> 10KVA now just to find out where that pain point is hahaha!
> ~Dan
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxxxxxxxxxx
> https://www.pupman.com/mailman/listinfo/tesla
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxxxxxxxxxx
https://www.pupman.com/mailman/listinfo/tesla
------------------------------
Message: 14
Date: Thu, 29 Aug 2019 11:15:14 -0700
From: jimlux <jimlux@xxxxxxxxxxxxx>
To: tesla@xxxxxxxxxxxxxxxxxx
Subject: Re: [TCML] The RF Police
Message-ID: <222bc718-e4e4-a406-e355-7e57462b4916@xxxxxxxxxxxxx>
Content-Type: text/plain; charset=windows-1252; format=flowed
On 8/29/19 8:34 AM, John Darwin Powers wrote:
> RF police.
>
> ?.. find the nearest amateur radio operator ?.. ARRL could help, would be
very happy to help ?.. Extra Class if possible, or contact the local radio
group. You can always contact the local FCC field office, and I am sure
that they would be curious and more than happy to take a measure. I would
probably not call the military to ask their opinion as everything is
probably a bad thing, and you house would be surrounded by very large Abrams
tanks and destroy your lawn, well you get the picture.
>
ARRL may or may not help - the staff at W1AW in Connecticut might be
interested in measuring it as an interesting project. If you're
somewhere else, calling a ham club that has people interested in this
(tricky issue, some hams will not be interested, some might be
interested and incapable of making the measurements).
Somewhere like the SBMS (San Bernardino Microwave Society) which is full
of experimenters would be a good possibility.
I wouldn't suggest contacting the FCC - never ask a question to which
you do not know the answer. If they take a measurement, it's because
they need evidence you're in violation. They don't have budget and time
for speculative field trips.
------------------------------
Message: 15
Date: Thu, 29 Aug 2019 16:43:46 -0500
From: David Rieben <drieben@xxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Subject: Re: [TCML] PFC Cap Bank
Message-ID: <2FBF5683-3833-4AFD-A400-C5301310A27C@xxxxxxx>
Content-Type: text/plain; charset=utf-8
I simply use a contactor to engage my pfc bank. I have 500 uFd worth, which
will draw a whopping 42 amps with no inductive load from the pure capacitive
reactance. They definitely do tend to reduce the wall plug current draw when
the heavy inductive load of the big transformer is online, though. I don?t
think it really matters whether or not you engage them ?under load? or not.
David Rieben
Sent from my iPhone
> On Aug 29, 2019, at 7:51 AM, Daniel Kunkel <dankunkel@xxxxxxxxx> wrote:
>
> I am building a power supply cabinet to handle my next build and I would
> like to incorporate a gang of PFC caps with switches to be able to enable
> them at will.
>
> Specs:
> Supply current will be 240VAC @ 25amps
> PFC will be 276uF according to JavaTC
>
> Questions:
> 1) I need to buy some switches but I am not sure how robust they need to
> be. How much current will the switches actually need to handle?
> 2) My assumption is that I should not turn the switches on/off while the
> coil is running. True?
>
> Thanks,
> ~Dan
> Kansas City area
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxxxxxxxxxx
> https://www.pupman.com/mailman/listinfo/tesla
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