Dummy Loads - What liquid do you fill them with ?
Richard Smith
Can anybody tell me what liquid I need to fill it with ? (I forgot to ask
when I bought it). I guess gasoline is not a good idea (only kidding !!),
but what sort of oil should I use ?
Cheers,
Richard.
--
Please remove the "NOSPAM" from my address if replying via email.
tn...@mucks.net
<rsm...@NOSPAMplaneteer.com> wrote:
>I bought a 'paint can' style dummy load at a local HAM fleamarket recently.
>Can anybody tell me what liquid I need to fill it with ? (I forgot to ask
>when I bought it). I guess gasoline is not a good idea (only kidding !!),
>but what sort of oil should I use ?
>
>Cheers,
>
>Richard.
I believe Mineral oil would be the best. You can also use Caster oil.
Wild Bill
since that load probably is only 1kw max anyhow.
"Richard Smith" <rsm...@NOSPAMplaneteer.com> wrote in message
news:JBVU5.2683$tj4....@tor-nn1.netcom.ca...
> I bought a 'paint can' style dummy load at a local HAM fleamarket
recently.
> Can anybody tell me what liquid I need to fill it with ? (I forgot to ask
> when I bought it). I guess gasoline is not a good idea (only kidding !!),
> but what sort of oil should I use ?
>
> Cheers,
>
> Richard.
>
RH3333
Brad KA8TOK
Transformer oil is the better one thou. You can ask for it at your
local power company.
On Tue, 28 Nov 2000 16:38:37 -0500, "Richard Smith"
<rsm...@NOSPAMplaneteer.com> wrote:
BillN6VLR
rh3...@aol.com (RH3333) wrote:
> cooking oil - vegatable type
>
Cool! I like it.Switch into the dummy load, fire up the rig,fire up the
amp, and fry some chicken :) Seriously, I would assume transformer oil
would be the best, is there a particular order of preference?
--
BillN6VLR
Sent via Deja.com http://www.deja.com/
Before you buy.
Scott (Unit 69 Chesapeake Bay)
N8wwm wrote:
>
> Have a cb'er masturbate into it...that's a DUMMY LOAD if I ever saw one...
That's it. Into the SHITCAN with you.
What did you do with all the dummy loads you've wasted?
(Don't answer, you are the first one to make it into my killfile.
I might read the first sentence of a Dave/Debby post, but you're outta there!)
twist...@webtv.net
fault everytime you hear a testube break you call out, "momma"?
Michael J.Talkington
can use transformer oil.
Richard Smith wrote:
> I bought a 'paint can' style dummy load at a local HAM fleamarket recently.
> Can anybody tell me what liquid I need to fill it with ? (I forgot to ask
> when I bought it). I guess gasoline is not a good idea (only kidding !!),
> but what sort of oil should I use ?
>
> Cheers,
>
> Richard.
>
Jeff Mayner
Jeff
"Richard Smith" <rsm...@NOSPAMplaneteer.com> wrote in message
news:JBVU5.2683$tj4....@tor-nn1.netcom.ca...
N8wwm
LOL...nope you got it wrong...I wasn't made in a test tube...I was assembled
from spare parts and surplus from Fair Radio Sales.
Quoth twist...@webtv.net....
Muk_AU
i have built a few dummy loads to test amps with and i use peanut oil
--
Muk_AU
http://www.desktopdollars.com/default.asp?id=muk69
"Jeff Mayner" <bk...@pacbell.net> wrote in message
news:t298sff...@news.supernews.com...
Miles Davis
"N8wwm" <n8...@aol.com> wrote in message
news:20001128181107...@ng-ci1.aol.com...
> Have a cb'er masturbate into it...that's a DUMMY LOAD if I ever saw one...
>
>
Miles Davis
LZBoyz
writes:
>Subject: Re: Dummy Loads - What liquid do you fill them with ?
>From: "Muk_AU" <muk...@iprimus.com.au>
>Date: Wed, 29 Nov 2000 22:20:51 +1100
>
>peanut oil is the best oil to use it wont get hot quick
>i have built a few dummy loads to test amps with and i use peanut oil
How many watts does it take to get the peanut oil up to temp. to fry turkey ??
I was thinking about buying a stainless steel turkey fryer. What is the max
temp rating of the dummy load ??? This may work out pretty good cause I need a
need a big dummy load and a turkey fryer.
Can you remove that dummy load from the 1 gallon pail ???
Lemme know
Thanx
Randy
>Muk_AU
>http://www.desktopdollars.com/default.asp?id=muk69
>"Jeff Mayner" <bk...@pacbell.net> wrote in message
>news:t298sff...@news.supernews.com...
>> Mineral oil.
>>
>> Jeff
>>
>> "Richard Smith" <rsm...@NOSPAMplaneteer.com> wrote in message
>> news:JBVU5.2683$tj4....@tor-nn1.netcom.ca...
>> > I bought a 'paint can' style dummy load at a local HAM fleamarket
>> recently.
>> > Can anybody tell me what liquid I need to fill it with ? (I forgot to
>ask
>> > when I bought it). I guess gasoline is not a good idea (only kidding
>!!),
>> > but what sort of oil should I use ?
>> >
>> > Cheers,
>> >
>> > Richard.
>> >
>> > --
>> > Please remove the "NOSPAM" from my address if replying via email.
>> >
>> >
>> >
>> >
>> >
>> >
>>
>>
>
>
>
>
>
>
>
>
>
> ------------------- Headers --------------------
>
>Path:
>lobby!newstf02.news.aol.com!portc01.blue.aol.com!cyclone2.usenetserver.co
m!news-out.usenetserver.com!news.maxwell.syr.edu!news.mel.connect.com.au!n
ews1.optus.net.au!optus!news0.optus.net.au!news.iprimus.com.au!203.134.126.96
>From: "Muk_AU" <muk...@iprimus.com.au>
>Newsgroups: rec.radio.cb
>References: <JBVU5.2683$tj4....@tor-nn1.netcom.ca>
><t298sff...@news.supernews.com>
>Subject: Re: Dummy Loads - What liquid do you fill them with ?
>Lines: 38
>X-Priority: 3
>X-MSMail-Priority: Normal
>X-Newsreader: Microsoft Outlook Express 5.00.2919.6600
>X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2919.6600
>X-Original-NNTP-Posting-Host: 203.134.126.96
>Message-ID: <3a24...@news.iprimus.com.au>
>X-Original-Trace: 29 Nov 2000 22:20:47 +1100, 203.134.126.96
>Date: Wed, 29 Nov 2000 22:20:51 +1100
>NNTP-Posting-Host: 203.134.64.67
>X-Trace: news0.optus.net.au 975496848 203.134.64.67 (Wed, 29 Nov 2000
>22:20:48 EST)
>NNTP-Posting-Date: Wed, 29 Nov 2000 22:20:48 EST
>Organization: CWO Customer - reports relating to abuse should be sent to
>ab...@cwo.net.au
>
>
LZBoyz
<KA8...@four-way.net> writes:
>Subject: Re: Dummy Loads - What liquid do you fill them with ?
>From: Brad KA8TOK <KA8...@four-way.net>
>Date: Tue, 28 Nov 2000 18:11:12 -0500
>
>Usually tranformer oil. or mineral oil. heck even motor oil will work.
>Transformer oil is the better one thou. You can ask for it at your
>local power company.
Make sure you tell the power company you want "new" oil. I`d bet that they
would be happy to give you all the pcb contaminated oil you can use. hahahahaha
!!!
Seriously, I think you can buy mineral oil in a drug store can`t you ????
73
Randy
>On Tue, 28 Nov 2000 16:38:37 -0500, "Richard Smith"
><rsm...@NOSPAMplaneteer.com> wrote:
>
>>I bought a 'paint can' style dummy load at a local HAM fleamarket recently.
>>Can anybody tell me what liquid I need to fill it with ? (I forgot to ask
>>when I bought it). I guess gasoline is not a good idea (only kidding !!),
>>but what sort of oil should I use ?
>>
>>Cheers,
>>
>>Richard.
>
>
>
>
>
>
>
>
>
>
> ------------------- Headers --------------------
>
>Path:
>lobby!newstf02.news.aol.com!portc01.blue.aol.com!newsfeed.skycache.com!Ci
dera!cyclone-sjo1.usenetserver.com!news-out.usenetserver.com!cyclone-pass-
sjo.usenetserver.com!cyclone1.usenetserver.com!e420r-sjo3.usenetserver.com
.POSTED!not-for-mail
>From: Brad KA8TOK <KA8...@four-way.net>
>Newsgroups: rec.radio.cb
>Subject: Re: Dummy Loads - What liquid do you fill them with ?
>Message-ID: <ppe82ts4t29i08gf8...@4ax.com>
>References: <JBVU5.2683$tj4....@tor-nn1.netcom.ca>
>X-Newsreader: Forte Agent 1.8/32.548
>MIME-Version: 1.0
>Content-Type: text/plain; charset=us-ascii
>Content-Transfer-Encoding: 7bit
>Lines: 16
>X-Abuse-Info: Please be sure to forward a copy of ALL headers
>X-Abuse-Info: Otherwise we will be unable to process your complaint properly
>X-Complaints-To: ab...@webusenet.com
>NNTP-Posting-Date: Tue, 28 Nov 2000 18:10:35 EST
>Organization: WebUseNet Corp http://www.usenetserver.com - Home of the
>fastest NNTP servers on the Net.
>Date: Tue, 28 Nov 2000 18:11:12 -0500
>
>
Richard Smith
I will try the mineral oil suggestion, as it is easier to get hold of, and I
do not plan on using more than 100 watts.
Cheers !
Richard
"Richard Smith" <rsm...@NOSPAMplaneteer.com> wrote in message
news:JBVU5.2683$tj4....@tor-nn1.netcom.ca...
> I bought a 'paint can' style dummy load at a local HAM fleamarket
recently.
> Can anybody tell me what liquid I need to fill it with ? (I forgot to ask
> when I bought it). I guess gasoline is not a good idea (only kidding !!),
> but what sort of oil should I use ?
>
> Cheers,
>
> Richard.
>
-=PEAKABOO=-
"Scott (Unit 69 Chesapeake Bay)" <upp...@hotmail.com> wrote in message
news:3A244536...@hotmail.com...
>
>
> N8wwm wrote:
> >
> > Have a cb'er masturbate into it...that's a DUMMY LOAD if I ever saw
one...
>
-=PEAKABOO=-
believe it is like 450 degrees, could be wrong but I beleive thats close.
"LZBoyz" <lzb...@aol.com> wrote in message
news:20001129114008...@nso-bk.aol.com...
>
> >Subject: Re: Dummy Loads - What liquid do you fill them with ?
> >Date: Wed, 29 Nov 2000 22:20:51 +1100
> >
> >peanut oil is the best oil to use it wont get hot quick
> >i have built a few dummy loads to test amps with and i use peanut oil
>
> How many watts does it take to get the peanut oil up to temp. to fry
turkey ??
> I was thinking about buying a stainless steel turkey fryer. What is the
max
> temp rating of the dummy load ??? This may work out pretty good cause I
need a
> need a big dummy load and a turkey fryer.
> Can you remove that dummy load from the 1 gallon pail ???
> Lemme know
> Thanx
> Randy
>
> >Muk_AU
> >http://www.desktopdollars.com/default.asp?id=muk69
> >"Jeff Mayner" <bk...@pacbell.net> wrote in message
> >news:t298sff...@news.supernews.com...
> >> Mineral oil.
> >>
> >> Jeff
> >>
> >> news:JBVU5.2683$tj4....@tor-nn1.netcom.ca...
> >> > I bought a 'paint can' style dummy load at a local HAM fleamarket
> >> recently.
> >> > Can anybody tell me what liquid I need to fill it with ? (I forgot to
> >ask
> >> > when I bought it). I guess gasoline is not a good idea (only kidding
> >!!),
> >> > but what sort of oil should I use ?
> >> >
> >> > Cheers,
> >> >
> >> > Richard.
> >> >
> >> > --
> >> > Please remove the "NOSPAM" from my address if replying via email.
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >>
> >>
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >Path:
> >lobby!newstf02.news.aol.com!portc01.blue.aol.com!cyclone2.usenetserver.co
> m!news-out.usenetserver.com!news.maxwell.syr.edu!news.mel.connect.com.au!n
>
ews1.optus.net.au!optus!news0.optus.net.au!news.iprimus.com.au!203.134.126.9
6
> >From: "Muk_AU" <muk...@iprimus.com.au>
> >Newsgroups: rec.radio.cb
> >References: <JBVU5.2683$tj4....@tor-nn1.netcom.ca>
> ><t298sff...@news.supernews.com>
Wild Bill
kw put some cheap old transmission fluid in it and be done with it . If you
had a nice fancy 3-510 kw load that is a different story. cripes the oil is
going to be worth more than the paint can load.
Wild Bill
transmission oil is more than you will ever need and probably cheaper than 1
gallon of mineral oil. Ever heard of severe overkill.
"Richard Smith" <rsm...@NOSPAMplaneteer.com> wrote in message
> Thanks for your help guys !
>
> I will try the mineral oil suggestion, as it is easier to get hold of, and
I
> do not plan on using more than 100 watts.
>
> Cheers !
>
> Richard
>
Richard McCollum
"Richard Smith" <rsm...@NOSPAMplaneteer.com> wrote in message
news:BIeV5.2930$tj4....@tor-nn1.netcom.ca...
> Thanks for your help guys !
>
> I will try the mineral oil suggestion, as it is easier to get hold of, and
I
> do not plan on using more than 100 watts.
>
> Cheers !
>
> Richard
>
> "Richard Smith" <rsm...@NOSPAMplaneteer.com> wrote in message
>
I wonder how long it will be before you work a station 1000+ miles away on
your dummy load. We all have done it.
Scott (Unit 69 Chesapeake Bay)
I used 4 packs of RS part # 271-1118 connected with RG-8M braid.
I will take a picture of it before I dunk it seal it up.
Should I just fill it with motor oil or ATF? I'm leaning
towards ATF because of the wetting factor of that fluid.
How much power can it handle wet and what kind of duty cycle
should I use?
Bendowersagain
about 6 years ago. Just about any industrial electronic supply company will
have it.
www.kp82.com
73 de Tim
Knight Patrol #82
http://www.kp82.com
JAMES HAMPTON
'offered help' to people to become a ham and (I wonder why) no one took him
up on the offer! I am having problems figuring out why some hams come into
the CB ngs, spew their venom, and then have the audacity to wonder why
people neither want their help nor appreciate their 'knowlege'. Excuse me
please, I've gotta find a barf bag.
Jim
Scott (Unit 69 Chesapeake Bay)
"www.kp82.com" wrote:
>
> when it gets too hot unkey. theres no precision science at work.
>
Should I dunk my hand in the oil to feel the resistors?!?! <g>
In free air it handles a 10 watt dead key. It doesn't get hot
enough to burn my hand. The oil should transfer the heat away,
but in a sealed one gallon bucket, it's kind of hard to tell
when "it gets too hot".
Since it is agreed that transformer oil is over kill, should I
use 10W30 or Dexron II? I have a case of motor oil on the porch.
www.kp82.com
touch its time to unkey and let it cool.
Wild Bill
and get real messynews:3A2674ED...@hotmail.com...
Scott (Unit 69 Chesapeake Bay)
purposes. I designed the load to start down in the can, not right at
the SO-239.
Donnie
>when it gets too hot unkey. theres no precision science at work.
>
>>
>>I just finished putting mine together with 20 1K 1/2 watt resistors.
>>I used 4 packs of RS part # 271-1118 connected with RG-8M braid.
>>
>>I will take a picture of it before I dunk it seal it up.
>>
>>Should I just fill it with motor oil or ATF? I'm leaning
>>towards ATF because of the wetting factor of that fluid.
>>
>>How much power can it handle wet and what kind of duty cycle
>>should I use?
>>
>>Richard Smith wrote:
>>>
>>> I bought a 'paint can' style dummy load at a local HAM fleamarket recently.
>>> Can anybody tell me what liquid I need to fill it with ? (I forgot to ask
>>> when I bought it). I guess gasoline is not a good idea (only kidding !!),
>>> but what sort of oil should I use ?
>>>
>>> Cheers,
>>>
>>> Richard.
>>>
>>> --
>>> Please remove the "NOSPAM" from my address if replying via email.
>>
>>
>>
>>
>>
>>
>
>
> 73 de Tim
> Knight Patrol #82
>http://www.kp82.com
Just piss on it!
Scott (Unit 69 Chesapeake Bay)
Dummie wrote:
>
> Just piss on it!
Handy Andy
Don't take them all, I need a few too...
On Thu, 30 Nov 2000 14:55:23 GMT, while the modem was pondering it's
navel, "JAMES HAMPTON" <j.r.h...@worldnet.att.net> dissertated the
following:
:+> Can you believe this ...[...]...
:+> I am having problems figuring out why some hams come into
:+> the CB ngs, spew their venom, and then have the audacity to wonder why
:+> people neither want their help nor appreciate their 'knowlege'.
:+> Excuse me please, I've gotta find a barf bag.
:+>
:+> Jim
Regards!
:+> Andy <+:
...
... You know you're a Hard-Core CB'er when...
... You have a Ham for dinner, and you *DO* remember
... what the Call-Sign was...
w8ron
Major Tom
"w8ron" <w8...@stratos.net> wrote in message
news:3a27d977$0$35389$6d9...@news.stratos.net...
Mike Yetsko
Mike
Speedbuggy714
to find but also may contain PCB's. Best bet is to get Mineral
oil at your local hardware store or at larger grocery stores. ATF
and motor oils are not the thing to use! If your afraid of
transformer oil because of the PCB's then the next best thing is
the Mineral oil. You can sometimes go to your local power company
and get the new style transformer oil which doesn't contain PCB's
and that is the very best stuff to use. They sometimes will fill
a gallon can for you at no charge. Next best... Mineral oil. Yes
you can mix these also. Some older oil filled dummy loads had
transformer oil in them and if you need to add some oil from
years of use you can mix it with Mineral oil. Mineral oil is like
baby oil but thicker. Do not use baby oil in a dummy load!
Mike
--
www.bcity.com/dino
w8ron wrote in message
<3a27d977$0$35389$6d9...@news.stratos.net>...
Scott (Unit 69 Chesapeake Bay)
Speedbuggy714 wrote:
>
> Finally...... Mineral oil or transformer oil which will be hard
> to find but also may contain PCB's. Best bet is to get Mineral
> oil at your local hardware store or at larger grocery stores. ATF
> and motor oils are not the thing to use!
Please explain why motor oil or ATF are not good to use. Do you
have a wattage in mind when you say that?
Ramirez327948198
connect a short length of coax to a 100 watt light bulb.
Triple 3
T4A11 @T4D08 (B)
Would a 100 watt light bulb make a good dummy load for tuning a transceiver?
A. Yes; a light bulb behaves exactly like a dummy load
B. No; the impedance of the light bulb changes as the filament gets hot
C. No; the light bulb would act like an open circuit
D. No; the light bulb would act like a short circuit
Scott (Unit 69 Chesapeake Bay)
Triple 3 wrote:
>
> T4A11 @T4D08 (B)
> Would a 100 watt light bulb make a good dummy load for tuning a transceiver?
> A. Yes; a light bulb behaves exactly like a dummy load
> B. No; the impedance of the light bulb changes as the filament gets hot
> C. No; the light bulb would act like an open circuit
> D. No; the light bulb would act like a short circuit
>
> Ramirez327948198 wrote:
> >
> > Or just skip the oil can. To make a simple dummy load for up to 100 watts
> > connect a short length of coax to a 100 watt light bulb.
Go ahead and tune your transmitter to a light bulb!
tn...@mucks.net
wrote:
>
>T4A11 @T4D08 (B)
>Would a 100 watt light bulb make a good dummy load for tuning a transceiver?
>A. Yes; a light bulb behaves exactly like a dummy load
>B. No; the impedance of the light bulb changes as the filament gets hot
>C. No; the light bulb would act like an open circuit
>D. No; the light bulb would act like a short circuit
B
Although light bulbs have been used for dummy loads they
are not optimum. They do not present a good SWR to the radio.
A light bulb dummy load does have a benefit. It unlike most
wattmeters will show an increase in brightness/power with
modulation. Most average reading wattmeters because of the
simplicity of the design can not show the 50% increase in
power with modulation.
Fred Hambrecht
If you are dealing with a radio that has a 50 ohm output you could have some
problems.
"Ramirez327948198" <ramirez3...@aol.com> wrote in message
news:20001204153703...@ng-fc1.aol.com...
tn...@mucks.net
wrote:
>I think you'd be surprised. A #47 light bulb is precisely 50 Ohms and
>works great for a 4W radio. You can also solder four of them together to
>up that to about 16W, which should cover off a stock CB 12W SSB rig. For
>higher powers, I think you'll find that a 250W Sylvania light bulb is
>deadly close to 52 Ohms. Think about it, the formulae is V2/R.
>(115x115)/50 = 250W. Just keep the lead lengths as short as possible and
>you should be fine on 27MHz and below. This is actually a good test of
>power as there is no arguing that a 250W light bulb that is glowing dim
>does not have 250W going into it.
The thread was about a 100 watt light bulb. I'm not sure what a # 47
bulb is. Certainly not 100 watts.
A 250 watt light bulb is 55 ohms at 117vac. At this voltage the
filament is hot and its resistance goes up. The filament in this bulb
when used with a 4 watt CB is considerably less than 55 ohms.
Although I don't have a 250 watter available I would guess it would
be closer to 10 ohms than 55 when used as a dummy load on a
4 watt radio.
Fred Hambrecht
12.5 ohms unless you series wired two bulbs and put it in parallel with a
second set of series wired bulbs.
<tn...@mucks.net> wrote in message
news:g7no2tcff9kl3vjlb...@4ax.com...
MC 10kW Jesus
works great for a 4W radio. You can also solder four of them together to
up that to about 16W, which should cover off a stock CB 12W SSB rig. For
higher powers, I think you'll find that a 250W Sylvania light bulb is
deadly close to 52 Ohms. Think about it, the formulae is V2/R.
(115x115)/50 = 250W. Just keep the lead lengths as short as possible and
you should be fine on 27MHz and below. This is actually a good test of
power as there is no arguing that a 250W light bulb that is glowing dim
does not have 250W going into it.
MC
JR
MC 10kW Jesus wrote:
> I think you'd be surprised. A #47 light bulb is precisely 50 Ohms and
> works great for a 4W radio. You can also solder four of them together to
> up that to about 16W, which should cover off a stock CB 12W SSB rig.
Just how do you maintain 50 ohms when you parallel or series four of them together?
> For
> higher powers, I think you'll find that a 250W Sylvania light bulb is
> deadly close to 52 Ohms. Think about it, the formulae is V2/R.
> (115x115)/50 = 250W. Just keep the lead lengths as short as possible and
> you should be fine on 27MHz and below. This is actually a good test of
> power as there is no arguing that a 250W light bulb that is glowing dim
> does not have 250W going into it.
Maybe 52 ohms at 60 Hz, but who knows what it is at 27 MHz...a lot of difference.
Scott (Unit 69 Chesapeake Bay)
JR wrote:
>
> MC 10kW Jesus wrote:
>
> > I think you'd be surprised. A #47 light bulb is precisely 50 Ohms and
> > works great for a 4W radio. You can also solder four of them together to
> > up that to about 16W, which should cover off a stock CB 12W SSB rig.
>
> Just how do you maintain 50 ohms when you parallel or series four of them together?
Make two pairs. Put two 50 ohm resistors in series. Makes 100 ohms. Then
put the two 100 ohm pairs in parallel. Makes 50 ohms again.
For a cheap dummy load, you can put twenty 1000 ohms CARBON resistors
in parallel. Or forty 2000 ohm resistors in parallel.
Simple average for several same value resistors.
For two resistors in parallel, the formula is:
R1+R2/R1*R2. This formula also works for capacitors in series.
Just make sure the values are in the same format (uF or pF).
Resistors in series just add up. Capacitors in parallel just add up.
(more below)
>
> > For
> > higher powers, I think you'll find that a 250W Sylvania light bulb is
> > deadly close to 52 Ohms. Think about it, the formulae is V2/R.
> > (115x115)/50 = 250W. Just keep the lead lengths as short as possible and
> > you should be fine on 27MHz and below. This is actually a good test of
> > power as there is no arguing that a 250W light bulb that is glowing dim
> > does not have 250W going into it.
>
> Maybe 52 ohms at 60 Hz, but who knows what it is at 27 MHz...a lot of difference.
Remember, a tungsten filament is coiled. This creates inductance that is added
in series to the bulb's DC resistance. That changes everything.
MC 10kW Jesus
tn...@mucks.net wrote:
>
> On Tue, 05 Dec 2000 02:30:02 GMT, MC 10kW Jesus <qs...@hotmail.com>
> wrote:
>
> >I think you'd be surprised. A #47 light bulb is precisely 50 Ohms and
> >works great for a 4W radio. You can also solder four of them together to
> >up that to about 16W, which should cover off a stock CB 12W SSB rig. For
> >higher powers, I think you'll find that a 250W Sylvania light bulb is
> >deadly close to 52 Ohms. Think about it, the formulae is V2/R.
> >(115x115)/50 = 250W. Just keep the lead lengths as short as possible and
> >you should be fine on 27MHz and below. This is actually a good test of
> >power as there is no arguing that a 250W light bulb that is glowing dim
> >does not have 250W going into it.
>
JR
"Scott (Unit 69 Chesapeake Bay)" wrote:
> JR wrote:
> >
> > MC 10kW Jesus wrote:
> >
> > > I think you'd be surprised. A #47 light bulb is precisely 50 Ohms and
> > > works great for a 4W radio. You can also solder four of them together to
> > > up that to about 16W, which should cover off a stock CB 12W SSB rig.
> >
> > Just how do you maintain 50 ohms when you parallel or series four of them together?
>
> Make two pairs. Put two 50 ohm resistors in series. Makes 100 ohms. Then
> put the two 100 ohm pairs in parallel. Makes 50 ohms again.
>
Series-parallel is the way you have to do it, but the impedance is not likely to be
anywhere near 50 ohms at 27 MHz.
N8wwm
He know all about dummy loads. Don't ya Scottiekins?
Scottiekins drools out his open mouth, splattering his keyboard with a mixture
of squirrel turds, Red Man, and saliva.
Hows the marriage going Scottiekins...are tnom and twistie being faithful?
Scott (Unit 69 Chesapeake Bay)
JR wrote:
> Maybe 52 ohms at 60 Hz, but who knows what it is at 27 MHz...a lot of difference.
"Scott (Unit 69 Chesapeake Bay)" wrote:
Remember, a tungsten filament is coiled. This creates inductance that is added
in series to the bulb's DC resistance. That changes everything.
JR wrote:
>
> "Scott (Unit 69 Chesapeake Bay)" wrote:
>
> > JR wrote:
> > >
> > > MC 10kW Jesus wrote:
> > >
> > > > I think you'd be surprised. A #47 light bulb is precisely 50 Ohms and
> > > > works great for a 4W radio. You can also solder four of them together to
> > > > up that to about 16W, which should cover off a stock CB 12W SSB rig.
> > >
> > > Just how do you maintain 50 ohms when you parallel or series four of them together?
> >
> > Make two pairs. Put two 50 ohm resistors in series. Makes 100 ohms. Then
> > put the two 100 ohm pairs in parallel. Makes 50 ohms again.
> >
>
MC 10kW Jesus
Do yourself a favor and just try it. Don't proclaim something as being
-not likely to be anywhere near 50 Ohms- until you try it yourself. I
have done it and I assure you it is deadly close to 50 Ohms at 27MHz and
110% safe. A couple of messages back you didn't know how to get 50 Ohms
from four 50 Ohm loads used together and now you have the audacity to
question my original premise without even investigating it? Turn the
computer off, go to the local library and get up to speed on basic
electronics. Then you can come back and add some value to the group.
MC just got down!
JR wrote:
>
> "Scott (Unit 69 Chesapeake Bay)" wrote:
>
> > JR wrote:
> > >
> > > MC 10kW Jesus wrote:
> > >
> > > > I think you'd be surprised. A #47 light bulb is precisely 50 Ohms and
> > > > works great for a 4W radio. You can also solder four of them together to
> > > > up that to about 16W, which should cover off a stock CB 12W SSB rig.
> > >
> > > Just how do you maintain 50 ohms when you parallel or series four of them together?
> >
> > Make two pairs. Put two 50 ohm resistors in series. Makes 100 ohms. Then
> > put the two 100 ohm pairs in parallel. Makes 50 ohms again.
> >
>
JR
MC 10kW Jesus wrote:
> JR,
>
> Do yourself a favor and just try it. Don't proclaim something as being
> -not likely to be anywhere near 50 Ohms- until you try it yourself. I
> have done it and I assure you it is deadly close to 50 Ohms at 27MHz and
> 110% safe.
And just how did you measure this impedance so that you know is so deadly close to 50 ohms
at 27 MHz?
> A couple of messages back you didn't know how to get 50 Ohms
> from four 50 Ohm loads used together and now you have the audacity to
> question my original premise without even investigating it? Turn the
> computer off, go to the local library and get up to speed on basic
> electronics. Then you can come back and add some value to the group.
I know perfectly well how to series/parallel resistances/impedances to arrive at another
resistance/impedance. I just wondered if you did. As far as basic electronics, my entire
career has been in electronics/computers. I was probably working in electronics before you
were born.
MC 10kW Jesus
> And just how did you measure this impedance so that you know is so deadly close to 50 ohms
> at 27 MHz?
With a VSWR bridge. Funny, when the load is exactly 50 Ohms, there is no
deflection in the reverse direction.
> I know perfectly well how to series/parallel resistances/impedances to arrive at another
> resistance/impedance. I just wondered if you did. As far as basic electronics, my entire
> career has been in electronics/computers. I was probably working in electronics before you
> were born.
I will resist the temptation to pose a question to you that will
embarrass you even further.
MC