..~wa5bxo/asyam/Amplitude%20Modulation.htm
The television visual carrier is amplitude modulated in such a
way. The black parts of the picture, in which noise is most
easily seen, are transmitted at the highest power, and the white
portions are transmitted at the lowest power.
Likewise the to
Donald Chester wrote:
From: "Robert M. Bratcher Jr." <[EMAIL PROTECTED]>
I wonder how many AM'ers run more than the legal 375 watts? I've
thought about it...
Check out the regs in Part 97. There is no mention whatever of 375
watts.
Don is right.
The legal maximum amount of power *ANY*
From: "Robert M. Bratcher Jr." <[EMAIL PROTECTED]>
I wonder how many AM'ers run more than the legal 375 watts? I've thought
about it...
Check out the regs in Part 97. There is no mention whatever of 375 watts.
Jim Wilhite wrote:
Considering how strong Otis's signal is in Sulphur, OK if his antenna is
only 25-30 ft. high, I am not sure he needs much more Geoff.
73 Jim
W5JO
Nah... we'll get him back up with a sky-hook, again.
y 14, 2005 12:21 PM
Subject: Re: [AMRadio] AM Amps
I had this discussion on the air this morning with some South Texas
locals.
Let me set this story up (it's a short transmission, and I'll listen for
breakers afterwards ;-))
I'm headed to K5SWK's tomorrow afterno
James M. Walker wrote:
Yep,
that is what the meters showed approximately 67% by my reckoning,
the 5KW dummy load gets warm only when you turn it up. There is
not enough drive from the DX-100 on AM to run it at the 3.5KW level
mentioned in the article. Ah, I might also mention that the article rig
- Original Message -
From: "Bob Bruhns" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio"
Sent: Friday, January 14, 2005 12:10 PM
Subject: Re: [AMRadio] AM Amps
> Come to think of it - since it is a grounded grid amp, some of the
> driver power is appearing in the
5 amperes
continuous. Sits in a six-foot rack with wheels and warms a corner of the
building.
Jim
- Original Message -
From: "Bob Bruhns" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio"
Sent: Friday, January 14, 2005 11:51 AM
Subject: Re: [AMRadio] AM Amps
> N
ies, modes are AM/CW from the DX-100. Adjustments
are left as an exercise for the student.
Jim
WB2FCN
- Original Message -
From: "Darrell, WA5VGO" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>; "Discussion of AM Radio"
Sent: Thursday, January 13, 2005 6:3
will be 357.5 watts.
- Original Message -
From: "Bob Bruhns" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio"
Sent: Friday, January 14, 2005 11:51 AM
Subject: Re: [AMRadio] AM Amps
> Nice amp! 670 watts dissipation, 1430 watts out means 1430 + 670
> wat
Sent: Wednesday, January 12, 2005 7:07 PM
Subject: RE: [AMRadio] AM Amps
Darrell,
That amp you built with the 4-1000 was a "killer" in more ways than one!
Time for a confession..
Regards,
Jim
WD5JKO
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf O
t;[EMAIL PROTECTED]>
To: "Discussion of AM Radio"
Sent: Thursday, January 13, 2005 11:48 AM
Subject: Re: [AMRadio] AM Amps
> Hum,
> 4-1000A G.G. amplifier, 3000 VDC plate, 700 MA Plate I, 500 MA
> Grid I, with 125 Watts out of DX-100 running apprx 2100 W input
and
> dissi
W from the DX-100. Adjustments
are left as an exercise for the student.
Jim
WB2FCN
- Original Message -
From: "Darrell, WA5VGO" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>; "Discussion of AM Radio"
Sent: Thursday, January 13, 2005 6:35 PM
Subject: Re: [AM
In a message dated 1/13/05 1:50:20 PM, [EMAIL PROTECTED] writes:
> How do you reduce the drive for AM? I take it that is how you operate CW?
>
> 73
> Gary K4FMX
>
>
> James M. Walker wrote:
> > Hum,
> > 4-1000A G.G. amplifier, 3000 VDC plate, 700 MA Plate I, 500 MA
> > Grid I, with 125 Watts
ow! This is with a 200 cfm blower, air system
> > socket and chimney.
> >
> > Jim
> > WB2FCN
> >
> > - Original Message -
> > From: "Jim candela" <[EMAIL PROTECTED]>
> > To: "Discussion of AM Radio"
> > Sent: Wednesday
Jim Candela wrote:
To keep the 4-1000 plate from shocking you, ground the
plate, and float the chassis.
Have John/WA5BXO tell you about the time I got sent (in a rather
unceremoniously manner) from my operating chair, to land upside
down on my shoulders, my feet dangling in the air, and a
Jim Candela wrote:
To keep the 4-1000 plate from shocking you, ground the
plate, and float the chassis.
Please trim up the messages when you reply, and
secondly, some of you "old timers" have garnered the trusted
respect of those who don't have as many gray hairs as y'all do.
Put a ";-)" or
00 was a "killer"
> in more ways than one!
> >>Time for a confession..
> >>
> >>Regards,
> >>Jim
> >>WD5JKO
> >>
> >>-Original Message-
> >>From: [EMAIL PROTECTED]
> >>[mailto:[EMAIL PROTECTED] Behal
Got to be CW, RTTY, etc. With AM you would either melt the tube down or
splatter all over the band.
73,
Darrell, WA5VGO
At 04:49 PM 1/13/2005 -0500, you wrote:
How do you reduce the drive for AM? I take it that is how you operate CW?
73
Gary K4FMX
James M. Walker wrote:
Hum,
4-1000A G.G
on of AM Radio"
Sent: Wednesday, January 12, 2005 7:07 PM
Subject: RE: [AMRadio] AM Amps
Darrell,
That amp you built with the 4-1000 was a "killer" in more ways than one!
Time for a confession..
Regards,
Jim
WD5JKO
-Original Message-
From: [EMAIL PROTECTED]
[mailto
good grief!! Now thats an AMP!
R
-- Original Message ---
From: "James M. Walker" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio"
Sent: Thu, 13 Jan 2005 11:48:34 -0500
Subject: Re: [AMRadio] AM Amps
> Hum,
> 4-1000A G.G. amplifier, 3000 V
In a message dated 1/13/05 8:48:33 AM, [EMAIL PROTECTED] writes:
> 4-1000A G.G. amplifier, 3000 VDC plate, 700 MA Plate I, 500 MA
> Grid I, with 125 Watts out of DX-100 running apprx 2100 W input and
> dissipating 670 watts plate = approximately 1430 watts output!
>
> While the carrier level in
glow! This is with a 200 cfm blower, air system
socket and chimney.
Jim
WB2FCN
- Original Message -
From: "Jim candela" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio"
Sent: Wednesday, January 12, 2005 7:07 PM
Subject: RE: [AMRadio] AM Amps
>
> Darrell,
&
ime for a confession..
Regards,
Jim
WD5JKO
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Darrell, WA5VGO
Sent: Tuesday, January 11, 2005 6:04 PM
To: Discussion of AM Radio
Subject: Re: [AMRadio] AM Amps
At 04:21 PM 1/11/2005 -0500, you wrote:
>In a message da
John,
If you don't have any luck here try the Amps mailing list. Sure to find
it there.[EMAIL PROTECTED]
73
Gary K4FMX
John Coleman wrote:
While on the Amplifier discussion, does any one know about a LK-800A by Amp
Supply. It has 3 forced air cooled 800 watt plate dissipation, ceramic
sion of AM Radio
Subject: Re: [AMRadio] AM Amps
At 04:21 PM 1/11/2005 -0500, you wrote:
>In a message dated 1/11/05 12:14:43 PM, [EMAIL PROTECTED] writes:
>
>
> > well all I can say is it works.. works well as a matter of fact, and has
> > been for 6 years :)
> > I typic
While on the Amplifier discussion, does any one know about a LK-800A by Amp
Supply. It has 3 forced air cooled 800 watt plate dissipation, ceramic
tubes, I think. It has some sort of a delay circuit to keep idiots from
applying drive before the heaters or up to temp. This circuit has failed
and
l Message -
From: "Geoff" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio"
Sent: Wednesday, January 12, 2005 2:46 PM
Subject: Re: [AMRadio] AM Amps
> CHRIS PAPAIOANNOU wrote:
>
> > The article it's in my hands Geoff,
> > seems very interesting
ginal Message -
From: "Geoff" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio"
Sent: Wednesday, January 12, 2005 2:46 PM
Subject: Re: [AMRadio] AM Amps
> CHRIS PAPAIOANNOU wrote:
>
> > The article it's in my hands Geoff,
> > seems very inte
CHRIS PAPAIOANNOU wrote:
The article it's in my hands Geoff,
seems very interesting by the first look.But didn't read it with care!
Thanks anyway for your contribution on the mode with the article.To all them
who are listed headline on the article!
Chris SV1DAF.
I'm puzzled by your statement e
t; <[EMAIL PROTECTED]>
To: "Discussion of AM Radio"
Sent: Tuesday, January 11, 2005 7:26 AM
Subject: Re: [AMRadio] AM Amps
> Gary Blau wrote:
>
> > Although both of these will serve to reduce the drive power and get you
> > on the air, they are less than optima
Not sure I understand that answer.
If the amp can easily handle 1500W PEP, and if your audio is symmetrical
(a big if), then the dreaded 375W number is a safe place to start. (I
can hear gaskets popping out there now...)
If you have a PEP wattmeter, then adjust while looking at that for a max
o
Hey Geoff:
Since there's already a screen at hand, why not use it to your advantage
in this case by making it variable to allow clean adjustment of output
power? It just seems like what the doctor ordered for driving a linear,
that's all.
As for your second question, I should have clarified t
Geoff wrote:
I'm not sure you can get more than around 1kW PEP output of a pair of
813's... and probably more like 800w. (3) in parallel would be a
different story, though.
73 = Best Regards,
-Geoff/W5OMR
I would say you are pretty much on the mark there. I have a pair of
813's in GG
I'm not sure you can get more than around 1kW PEP output of a pair of
813's... and probably more like 800w. (3) in parallel would be a
different story, though.
73 = Best Regards,
-Geoff/W5OMR
I would say you are pretty much on the mark there. I have a pair of
813's in GG also. I only run
Geoff wrote:
Gary Schafer wrote:
I know full well that there is no such thing as a 375 watt carrier
limit to AM power in the FCC rules. I never said there was.
Ok, good. I was just making sure ;) Too many people believe that
there's some 'magical mystification' about 375w of carrier out
Geoff wrote:
Gary Schafer wrote:
First you would need to tune it up at the 1500 watt out level. Then
apply enough drive from the ranger so you have about 375 watts carrier
out. That will be good for 100% modulation peaks.
Perhaps, if you were feeding nothing more than a sine wave to it.
Gary Schafer wrote:
First you would need to tune it up at the 1500 watt out level. Then
apply enough drive from the ranger so you have about 375 watts carrier
out. That will be good for 100% modulation peaks.
Perhaps, if you were feeding nothing more than a sine wave to it.
First you would need to tune it up at the 1500 watt out level. Then
apply enough drive from the ranger so you have about 375 watts carrier
out. That will be good for 100% modulation peaks. If you want to run
more than 100% modulation then you would need to lower the carrier level
with less driv
Byron Lichtenwalner wrote:
If you had an amp rated at 1500 pep rated for Continuous Commercial
Service and were going to drive it with a Ranger, (with W3AM's
modification as an example) where would you set the carrier level with
no modulation?
Byron, W3WKR
Where the 'scope showed that I had
If you had an amp rated at 1500 pep rated for Continuous Commercial Service
and were going to drive it with a Ranger, (with W3AM's modification as an
example) where would you set the carrier level with no modulation?
Byron, W3WKR
In my National NCL-2000, I can run 200W carrier and 800W PEP, but
I do not, as 8122's are costly and the NCL's blower is really too
small. I usually do my testing at 100W carrier and 400W PEP. In
that amp, tuned up properly for each of two carrier level cases
(approximately):
loaded for 800W
Gary Schafer wrote:
I know full well that there is no such thing as a 375 watt carrier limit
to AM power in the FCC rules. I never said there was.
Ok, good. I was just making sure ;) Too many people believe
that there's some 'magical mystification' about 375w of carrier
output being the 'l
Joe Crawford wrote:
I just found a pair of 450TL's. Trying to find sockets for them and some
HK-254's.
Joe W4AAB
Rangers typically deliver around 40w out of the SO-239.
20w out of the Ranger would be enough, if there were around 1000w of
dissapation i
I know full well that there is no such thing as a 375 watt carrier limit
to AM power in the FCC rules. I never said there was.
I was trying to "clarify" Ronnie's statement about how much power he
runs his 813's at when he says he runs them at legal power out.
And since we don't know if Ronnie h
I just found a pair of 450TL's. Trying to find sockets for them and some
HK-254's.
Joe W4AAB
Geoff writes:
Bob Maser wrote:
Why not just use a coax Tee and dump half of the output power of the
Ranger into a 50 ohm dummy load and the other half into the
I wonder if I could drive my 3CX3000 Lineeaar with my Valiant. H.
Bob
Geoff wrote:
Gary Schafer wrote:
By "legal power out of the 813's" I assume you mean 375 watts carrier?
Why assume something that is false??
That statement is -designed- to put you on edge, Gary. Perhaps it's
just my perception, but it simply appears as if you're not paying
attention.
I'm with Dennis and Gary. To run a linear amplifier at 375 watts of
carrier and 100% modulation, you will need around 800 watts of plate
dissipation. For a short time a number of years ago, I tried running an
AF-68 and a 4-1000A linear amplifier. I could never get more than around
450 watts o
Gary Schafer wrote:
By "legal power out of the 813's" I assume you mean 375 watts carrier?
Why assume something that is false??
That statement is -designed- to put you on edge, Gary. Perhaps
it's just my perception, but it simply appears as if you're not
paying attention.
NO WHERE does it
At 04:21 PM 1/11/2005 -0500, you wrote:
In a message dated 1/11/05 12:14:43 PM, [EMAIL PROTECTED] writes:
> well all I can say is it works.. works well as a matter of fact, and has
> been for 6 years :)
> I typically run between 350 and 400 watts of carrier every day. It looks
> great on the s
In a message dated 1/11/05 12:14:43 PM, [EMAIL PROTECTED] writes:
> well all I can say is it works.. works well as a matter of fact, and has
> been for 6 years :)
> I typically run between 350 and 400 watts of carrier every day. It looks
> great on the scope. Modulation envelope is perfect. 100%
PROTECTED] On Behalf Of Robert M. Bratcher Jr.
Sent: Tuesday, January 11, 2005 11:43 AM
To: Discussion of AM Radio
Subject: Re: [AMRadio] AM Amps
At 04:31 AM 1/11/2005, you wrote:
>73s to all,
>regarding Dick's problem i'd try to match 1st the Ranger's output pwr with
>the ne
that one.
Ronnie - W5SUM
-- Original Message ---
From: Gary Schafer <[EMAIL PROTECTED]>
To: Discussion of AM Radio
Sent: Tue, 11 Jan 2005 14:34:26 -0500
Subject: Re: [AMRadio] AM Amps
> By "legal power out of the 813's" I assume you mean 375 watts
>
By "legal power out of the 813's" I assume you mean 375 watts carrier?
If so there is no way the peaks are going to 1500 watts. A pair of 813's
will not put out that much power in GG linear configuration. At least
not very long.
A pair of 813's in GG are good for about the same power out as 4
it's 500 Watts over here this limit.
Chris SV1DAF.
- Original Message -
From: "Robert M. Bratcher Jr." <[EMAIL PROTECTED]>
To: "Discussion of AM Radio"
Sent: Tuesday, January 11, 2005 6:43 PM
Subject: Re: [AMRadio] AM Amps
> At 04:31 AM 1/11/2005, you
Robert M. Bratcher Jr. wrote:
If I wanted more than 100w of AM (out of my Collins 23V-3) then I'd use
it for carrier only then plate modulate an amplifier with a modulation
transformer (if I could find one) plus a speech amp. Then I'd run the
maximum legal AM power of 375 watts.
But then I r
At 04:31 AM 1/11/2005, you wrote:
73s to all,
regarding Dick's problem i'd try to match 1st the Ranger's output pwr with
the needed input pwr of one of the amps.The choice of the amp depends on the
output pwr someone wants to "push on the air".Saw a Ranger there in Ebay and
think it's using somet
Gary Blau wrote:
Not sure where the article is exactly pertinent to this.
If the exciter B+ is reduced, so is the max available exciter PEP.
If the B+ stays the same and the screen V is reduced the max available
exciter PEP is (roughly) the same, but the carrier power out (no mod)
goes down.
I
This aint rocket science at my shack.
I have a pair of trusty old 813's in grounded grid with 3200 Volts on the
plates. I drive them with my Ranger all the time with no problems at all.
I always tune the ranger up to full power into a either a dummy, or my
dipole. THEN switch the 813's into th
the 2nd grid resistance is in value the worst.It's "pushing hard on
limits" the tube depending on the B+ and grid voltages also.
Hope it helps,
Chris SV1DAF.
- Original Message -
From: "Gary Schafer" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio"
Sent:
In a message dated 1/10/05 9:12:45 PM, [EMAIL PROTECTED] writes:
> Kinda Sorta. Depends on the quality of the transmitter. If he
> reduces the carrier output power of the Ranger, then the audio
> output power will rise, because there won't be as much final
> current flowing through the seconda
Not sure where the article is exactly pertinent to this.
If the exciter B+ is reduced, so is the max available exciter PEP.
If the B+ stays the same and the screen V is reduced the max available
exciter PEP is (roughly) the same, but the carrier power out (no mod)
goes down.
If your concern is run
Gary Blau wrote:
Although both of these will serve to reduce the drive power and get you
on the air, they are less than optimal.
The problem with reducing the B+ is the max PEP goes with it. You'll
want to preserve that for positive modulation peaks. As Gary Schafer
sez you want to keep the d
Bob Maser wrote:
Why not just use a coax Tee and dump half of the output power of the
Ranger into a 50 ohm dummy load and the other half into the amp?
Rangers typically deliver around 40w out of the SO-239.
20w out of the Ranger would be enough, if there were around 1000w
of dissapation in th
Although both of these will serve to reduce the drive power and get you
on the air, they are less than optimal.
The problem with reducing the B+ is the max PEP goes with it. You'll
want to preserve that for positive modulation peaks. As Gary Schafer
sez you want to keep the driver PEP up to wher
Why not just use a coax Tee and dump half of the output power of the Ranger
into a 50 ohm dummy load and the other half into the amp?
Bob
I build a couple switchable pads that allow me to run the Ranger into
the Thunderbolt or any other amp. It's also variable. Just a few
resistors and a switch from an antenna switchbox. I think the T-Bolt
manual has the directions.
73 Chris VE3NGW Fort Lauderdale Florida
http://www.ckradio
Gary Schafer wrote:
Here is a ruff rule of thumb for amps on AM:
If the amp takes 100 watts to drive it on ssb then it will take 100
watts pep of AM to drive it. 100 watts pep of AM means 25 watts of
carrier with 100% modulation.
Kinda Sorta. Depends on the quality of the transmitter. If h
Gary Blau wrote:
I partially disagree, but with a -big- proviso.
You'll have to find a way to reduce the Ranger output to the 10-15 watt
level. Maybe the nicest way to do that is a variable screen voltage
control, similar to what you'll find here:
http://www.w3am.com/ranger.html
but I'm sure t
Here is a ruff rule of thumb for amps on AM:
If the amp takes 100 watts to drive it on ssb then it will take 100
watts pep of AM to drive it. 100 watts pep of AM means 25 watts of
carrier with 100% modulation.
You will also get 25% of the carrier out of the amp from it's pep output
level. If
I partially disagree, but with a -big- proviso.
You'll have to find a way to reduce the Ranger output to the 10-15 watt
level. Maybe the nicest way to do that is a variable screen voltage
control, similar to what you'll find here:
http://www.w3am.com/ranger.html
but I'm sure there are other metho
Hi Dick
The 30L1 would far too over stressed but the Henry would be perfect, by
the way thanks for buying my Ranger, 73 Chris
RICHARD W GILLESPIE wrote:
I just bought a Johnson Ranger and wonder if my 30L1 or Henry 2KD
would work okay. 811's in the 30L1 and a pair of 3-500's in the Henry.
38 -0700
Subject: [AMRadio] AM Amps
> I just bought a Johnson Ranger and wonder if my 30L1 or Henry 2KD
> would work okay. 811's in the 30L1 and a pair of 3-500's in the
> Henry. Thanks.
>
> Dick/K5DIC
>
> _
I just bought a Johnson Ranger and wonder if my 30L1 or Henry 2KD would work
okay. 811's in the 30L1 and a pair of 3-500's in the Henry. Thanks.
Dick/K5DIC
_
On the road to retirement? Check out MSN Life Events for advice on how to
75 matches
Mail list logo
