Anyone know what the old "thick" records are worth these days?
73
Gary K4FMX
> -Original Message-
> From: amradio-boun...@mailman.qth.net [mailto:amradio-
> boun...@mailman.qth.net] On Behalf Of jon baker
> Sent: Thursday, January 21, 2010 7:19 AM
> To: Discussion of AM Radio in the Amate
> Jim/W5JO
>
>
> - Original Message -
> From: "Gary Schafer"
>
>
> > If you guys want some real base response I have a pair of 30 inch sub
> > woofers each mounted in 36 cubic foot enclosures with 1 1/2 inch thick
> > walls. These will
If you guys want some real base response I have a pair of 30 inch sub
woofers each mounted in 36 cubic foot enclosures with 1 1/2 inch thick
walls. These will supply true 16 Hz response with very low distortion. And
they will shake your pant legs if you desire.
They are for sale if someone is inter
There are some henry parts on QTH.com for sale. Not cheap but he does have
the meters. Ad #733267 -
73
Gary K4FMX
> -Original Message-
> From: amradio-boun...@mailman.qth.net [mailto:amradio-
> boun...@mailman.qth.net] On Behalf Of ronnie.hull
> Sent: Tuesday, April 07, 2009 5:24 PM
> To
I accidentally erased the original message so replying here.
With drifting plate current and low grid drive the first thing I would check
is the adjustment of the clamp tube circuit. Low grid drive will cause the
clamp tube to reduce screen voltage. Or maybe the clamp circuit is adjusted
right and
I acquired an rf section with a pair of 5514 tubes in it awhile back. Does
anyone know what a 5514 is?
They look a little like an 811 or 812
Thanks
Gary K4FMX
__
Our Main Website: http://www.amfone.net
AMRadio mailing list
Searchabl
No one was erroneously put on the swap list. All that was done was to split
up the Am radio list into AM radio and AM swap list. All the subscribers
were also set up on the AM swap list by the kindness of the list
administrator.
It is no different than when the list was moved to another server and
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:amradio-
> [EMAIL PROTECTED] On Behalf Of A.R.S. - WA5AM
> Sent: Thursday, March 06, 2008 10:43 AM
> To: Discussion of AM Radio in the Amateur Service
> Subject: Re: [AMRadio] Drake L-4B on AM
>
> On Thu, Mar 6, 2008 at 9:37 AM, kenw
Go here and start fresh. Forget about your old password for the swap list.
http://mailman.qth.net/mailman/listinfo/amswap
73
Gary K4FMX
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:amradio-
> [EMAIL PROTECTED] On Behalf Of Jim Isbell, W5JAI
> Sent: Wednesday, March 05, 2008
I normally don't like to get involved in this kind of thing but will put in
my 2 cents this time. I have to agree that it would be much simpler to have
the reflector set up with the "reply to" and "reply to all" to work like
most all other reflectors are set up. That, in my opinion, would solve mos
> The waveform of the rf signal is not the same thing as the waveform of the
> envelope pattern of a modulated waveform.
We could term this "modulation power of the transmitter" to distinguish it
from PEP.
>When we talk about the average
> power output, or mean power output of a transmitter,
Don wrote:
>There is no such thing a an "rf power" meter, at least when we are >talking
about an instrument that most amateurs could afford. The so->called
"wattmeters" are really rf voltmeters calibrated to the read the >level of
power delivered when the measured voltage is imposed across a
The average VOLTAGE of a sine wave is meaningless. You don't use it to
calculate average power. We are looking for the RMS value.
The RF signal is always composed of sine waves no matter if there is
modulation or no modulation. It also doesn't matter what the wave shape of
the modulating signal is
le?
>
> Bob Macklin
> K5MYJ
> Seattle, Wa,
> "Real Radios Glow in the Dark"
>
> - Original Message -
> From: "Gary Schafer" <[EMAIL PROTECTED]>
> To: "'Discussion of AM Radio in the Amateur Service'"
>
> Sent:
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:amradio-
> [EMAIL PROTECTED] On Behalf Of Bob Macklin
> Sent: Thursday, February 14, 2008 5:19 PM
> To: Discussion of AM Radio in the Amateur Service
> Subject: Re: [AMRadio] Modulation power required
>
> Why not just calibrate a Tra
Thank you John!
You are absolutely right. That should have been; at least one RF cycle at
the peak of the audio envelope. That's what I thought I wrote but I guess
the gremlins messed it up. :>)
What you are talking about, seeing it on a scope can be easily done as you
describe if you have a fast
MODULATION POWER REQUIRED
Since the discussion the other day about reducing drive when using a linear
amp seemed to have some interest maybe this will be of interest to some
also.
For a plate modulated final it is common thought that if you have a 100 watt
input final amp that you need 50 w
ing power into a dummy load, reduce Ip of the final by
> re-tuning a little till the current is about 50%. Note the modulation
> percentage level on the scope has increased and the class B modulators are
> drawing less current.
>
> John, WA5BXO
>
>
> -Original Message-
in the Amateur Service
> Subject: Re: [AMRadio] RE: Using a Ranger as a driver
>
> Gary Schafer wrote:
> > While it is true that for 100% modulation the modulation voltage must be
> > equal to the final plate voltage.
>
> No. Not equal to, but *twice* as much. 2*Ep
&g
While it is true that for 100% modulation the modulation voltage must be
equal to the final plate voltage. But it is also misleading to say that it
is strictly a function of modulation voltage.
If it were only voltage needed then we could use a very high step up ratio
modulation transformer to acco
Hi Jim,
I think what John is saying is that you do NOT want to retune when you lower
the plate voltage in order to maintain the same plate impedance.
If you were to half the plate voltage with a modification to the transmitter
then during tune up you would want to tune up to half the plate curren
Nice display Jim!
But put it in the double side band position and reduce the carrier to -60 db
or so and notice that you have exactly the same wave form as that of the SSB
with carrier at -6db, which is equal to the side band energy in this case.
It is not the transmission of the single side band
If you are trying to align it using a tone and looking for a flat response
on the scope and you have any hum in the circuit you will never get it
aligned. Hum can come from poor filter caps in the power supply or audio
leads picking it up.
The best way that I have found to align phasing rigs is to
Someone mentioned using the driver transformer from a Viking 11. It may work
ok if there is enough audio from the driver. The difference is that in the
Viking 11 the 807 modulators run AB2 and draw some grid current on peaks.
This requires a low impedance drive source so the driver transformer in
t
Can someone tell me what a 51J3 is going for these days? One was donated to
our club and they would like to sell it to raise funds for some projects.
The 51J3 is in very nice condition. Has top and bottom covers.
Thanks for the help.
Gary K4FMX
__
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:amradio-
> [EMAIL PROTECTED] On Behalf Of Bob Macklin
> Sent: Friday, April 06, 2007 11:52 PM
> To: Discussion of AM Radio in the Amateur Service
> Subject: Re: [AMRadio] Re: GB> AM vs SSB???
>
> RBethman comments:
>
> < ONLY
> one
It is a good idea to use a separate fuse for the high voltage and the low
voltage. With one fuse only you can have a short on the low voltage and it
will cook the low voltage transformer and never blow the fuse. BTDT.
73
Gary K4FMX
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:a
You had best have something to protect that microameter when you turn on the
supply as the capacitance of the transformer windings will look like a short
to the meter until the charge equalizes.
Running it up with a variac would be ok.
73
Gary K4FMX
> -Original Message-
> From: [EMAIL PR
Just a note about work bench tops if you happen to be doing this high
voltage testing on the bench. Some bench top surfaces like kitchen cabinet
counter tops that are made of formica are very conductive! Be careful.
73
Gary K4FMX
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:amr
There are different types of meggers. You may be better off with a hi-pot
tester.
http://www.somis.org/BVT.html
73
Gary K4FMX
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:amradio-
> [EMAIL PROTECTED] On Behalf Of Rick Brashear
> Sent: Tuesday, February 13, 2007 11:59 AM
> To:
Hi Jim,
Testing my patience with the computer! Trying to figure out how to edit the
address history file for the "send to" in outlook. Can't figure out how to
add or delete an address from it.
Whenever I send something to someone it automatically adds the address but I
don't know how to do
Test
___
Amradio mailing list
List Home: http://w5ami.net/mailman/listinfo/amradio_w5ami.net
Partner Website: http://www.amfone.net
Post: mailto:Amradio@w5ami.net
> >>
> >> P E P (AM)
> >> % Modulation = (( PEP - PC) / PC) *100%
> >>
> >> Example:
> >> Carrier Power PC = 100 W, PEP = 400 W.
> >>
> >> Determine % Modulation
> >> M% = (( 400 - 100) / 100) *100% = ((20-10) / 10) *100% = 100%
> > Hmmm, let's see, 400 watts -100 watts = 300 watts. Divided by
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:amradio-
> [EMAIL PROTECTED] On Behalf Of Geoff/W5OMR
> Sent: Friday, December 29, 2006 4:42 PM
> To: Discussion of AM Radio
> Subject: [AMRadio] PEP for AM
>
> Anyway, I ran across this information, and thought I'd share it with the
Coax works fine for HV leads. I have an 813 amp with around 2500 volts that
I have had a piece of rg58 on for years.
I have a commercial lab 15Kv supply that has a modified pl259 and rg8 cable
coming out of it.
Ground the shield and if it should arc it will only arc to ground.
73
Gary K4FMX
> -
I haven't listened on 80 for those signals but I have herd similar to what
you describe in the past. A few years ago there were several companies
selling scramblers that inverted the audio. A lot of them went into South
America and were used by people for their "private" radio networks. I would
gue
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:amradio-
> [EMAIL PROTECTED] On Behalf Of Anthony W. DePrato
> Sent: Saturday, December 16, 2006 9:39 PM
> To: [EMAIL PROTECTED]; Discussion of AM Radio in the Amateur Service
> Subject: RE: [AMRadio] No Code Pros and Cons
>
>
> >
>
> Well
>
>Speaking as the guy who actually brought up the 'dumbing-down' issue in
> this thread - I'd like to posit a Thought on the issue of "no-code ham
> license" vs. "IQ".
For all those that think that the code is a big part of being a
knowledgeable ham keep this in mind: In the past
>
>
> Dave, W3ST
> Publisher of the Collins Journal
> Secretary to the Collins Radio Association
> www.collinsra.com - the CRA Website
> Now with PayPal
> CRA Nets: 3.805 Mhz every Monday at 8 PM EST
> and 14.253 Mhz every Saturday at 12 Noon EST
> Collins Chatroom - D
The 813 and 572 are tubes that should never show color.
73
Gary K4FMX
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:amradio-
> [EMAIL PROTECTED] On Behalf Of Jim Wilhite
> Sent: Monday, December 11, 2006 12:24 PM
> To: Discussion of AM Radio in the Amateur Service
> Subject: Re:
See below..
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:amradio-
> [EMAIL PROTECTED] On Behalf Of Geoff/W5OMR
> Sent: Thursday, December 07, 2006 4:48 PM
> To: Discussion of AM Radio in the Amateur Service
> Subject: Re: [AMRadio] Re: Pw Supply
>
> Gary
I am not so sure the correct answer was given and there was no explanation
of why two separate transformers would not work other than the "primary
current seemed higher".
It seems this would make a much better topic to argue about than some other
recent ones.
73
Gary K4FMX
> -Original Mess
I forget where I saw someone looking for a scope tube. Was it here? Anyway
here is a guy with some scope tubes.
73
Gary K4FMX
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Greg Mijal
Sent: Tuesday, November 21, 2006 8:47 PM
To: [EMAIL PROTECTED]
Cc: [
Plate to plate impedance on the 6L6's is going to be in the neighborhood of
5000 to 6000 ohms. 400 volts plate to plate voltage swing would be around 26
watts of audio.
Plate voltage swing to ground would be 1/2 the above or around 200 volts to
ground for 1 tube.
Since there is about 26 volts of
eur Service
> Subject: Re: [AMRadio] Ranger Audio... the numbers
>
> Gary Schafer wrote:
>
> > Check at the center tap of the mod driver transformer with your scope
> and
> > see if you see anything there. Could be a bad or missing bypass cap
> there.
>
> It'
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:amradio-
> [EMAIL PROTECTED] On Behalf Of Jack Schmidling
> Sent: Thursday, November 16, 2006 10:02 PM
> To: Discussion of AM Radio in the Amateur Service
> Subject: [AMRadio] Ranger Audio... the numbers
>
> I can not do a freq respo
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:amradio-
> [EMAIL PROTECTED] On Behalf Of Larry Taft
> Sent: Thursday, November 16, 2006 11:06 AM
> To: Discussion of AM Radio in the Amateur Service
> Subject: Re: [AMRadio] Ranger Modulation
>
> Well, I tried...I wasn't right so no
You can't reverse the plate leads on the modulator tubes because it uses
negative feedback from a winding on the transformer. Reversing the plate
leads puts the feed back in phase rather than out of phase. It will
oscillate!
First check to see that you have proper grid current on the 6146. Low gri
Or you could just reduce the loading with a 6146 in place and do the same
thing. You end up with the same plate load impedance either way. No free
lunch.
73
Gary K4FMX
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:amradio-
> [EMAIL PROTECTED] On Behalf Of Jack Schmidling
> Sent
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:amradio-
> [EMAIL PROTECTED] On Behalf Of Jack Schmidling
> Sent: Friday, December 08, 2006 11:43 AM
> To: Discussion of AM Radio in the Amateur Service
> Subject: Re: [AMRadio] Re: Ranger... good news, bad news
I have never had a ranger hooked to an SB200 but it sounds to me that 12 to
15 watts is not enough drive for it. The SB200 has a gain of about 6 if I
remember right.
That means that 100 watts of drive will give 600 watts output.
If you want 125 watts carrier output that requires the amp be capable
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Jack Schmidling
Sent: Thursday, December 07, 2006 5:49 PM
To: Discussion of AM Radio in the Amateur Service
Subject: Re: [AMRadio] Ranger... good news, bad news
Gary Schafer wrote:
>If you want to run
I should have re-titled the subject for this.
Using a ranger or other AM transmitter with a linear amp requires the
amplifier be tuned up with full modulation on the ranger with reduced power
out of the ranger watching a scope at the output of the amplifier. It does
not have enough carrier at full
I am not sure that you are really tuning up as you describe but if so you
will be flat toping quite seriously.
Using a ranger or other AM transmitter with a linear amp requires the
amplifier be tuned up with full modulation on the ranger with reduced power
out of the ranger watching a scope at the
Put a T connector on the output rf connector and put a capacitor on one side
of the T.
73
Gary K4FMX
> As for my SB200 with a carrier only output of 75 watts the tubes
> will show a little color after ten minutes. I would like to drive the
> SB200
> harder and unload the output to dip th
John,
Are you peaking the output circuit on the SB200 after you reduce the drive?
If you are just using carrier out of it to drive the grid of the next amp
you should peak everything to get maximum efficiency. Efficiency should be
near 60% even at the low power level if you retune the plate circui
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:amradio-
> [EMAIL PROTECTED] On Behalf Of Jack Schmidling
> Sent: Saturday, November 04, 2006 10:04 PM
> To: Discussion of AM Radio in the Amateur Service
> Subject: Re: [AMRadio] Ranger... good news, bad news
>
> Mike Sawyer wrote:
If you haven't done so already look in the tube manual at the tube that goes
into that socket. Some tubes have more than one pin connection for the
cathode. As an example, tubes with a suppressor grid sometimes have that
grid run to a pin and also an internal connection between the suppressor and
c
Probably sizes for conduit.
73
Gary K4FMX
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:amradio-
> [EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
> Sent: Thursday, October 19, 2006 8:01 PM
> To: [EMAIL PROTECTED]; [EMAIL PROTECTED]; amradio@mailman.qth.net;
> [EMAIL PROTECTED]
Hi Mike,
While the sharp pointed rods are ok at the top of the towers to try and make
them the place where lightning strikes first, the insulated down lead is not
a good idea.
It is better to connect the lightning rod directly to the tower. The tower
will have much less inductance than the down le
A square plate buried in the ground makes a poor ground for lightning.
Lightning is dissipated in a sphere around a ground rod. The longer the rod
the larger the sphere of dissipation. Length is what is important, not
surface area.
On the other hand too long a rod does little good either. As lengt
>
> While I like the list in its current configuration, I do see how it
> could be annoying to get duplicates sent to both the list and the
> original poster(s). Having just done this to Gary and Geoff, from now
> on I'll try to remedy this and send only to the list. Old habits die
> hard. Sorry
very Monday at 8 PM EST
> and 14255 every Saturday at 12 Noon EST
> - Original Message -
> From: "Gary Schafer" <[EMAIL PROTECTED]>
> To: "'Stevan A. White'" <[EMAIL PROTECTED]>; "'Discussion of AM Radio'"
> ; <[EMAIL PR
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:amradio-
> [EMAIL PROTECTED] On Behalf Of W5OMR/Geoff
> Sent: Monday, June 12, 2006 10:52 PM
> To: Discussion of AM Radio
> Subject: [AMRadio] Re: upside down reply buttons, sending to whom, and
> tops VS bottoms and other non AM tech
>This affords you the
> opportunity
> to bond the tower, rebar, AND several copper clad ground rods together for
> the best possible DC ground for your tower. If you want an RF ground
> return
> for your installation, install a heavy duty copper ring and bond it to the
> ground rods.
> Best Re
Be careful when giving this advice.
A UFER ground is a good SUPLEMENTAL ground in a tower base but it should not
be the only ground. A large area like a floor of a building provides more
surface for the lightning to dissipate. A tower concrete foundation may not
be large enough by itself and there
Every other list that I subscribe to operates the way you now have it set.
That is how I would prefer it to be.
Reply: goes only to the sender.
Reply to all: goes to the list.
When you set it the other way the only way to reply to an individual is to
cut and past his address.
Everyone should be
This sounds like a class C linear screen driven amp. I couldn't find the
article on it but W9VMQ built such an amp using 6DQ5's in the early 60's. I
think he also did some experimenting with the 813 also. I think the article
was in Ham Radio magazine. Maybe someone can do a search for it. Probably
Some of this seems a little backwards. The typical CB 1/4 wave antenna is a
rather low angle radiator not a high angle radiator. The major lobe is very
low, less than 10 degrees. Many higher angle lobes do occur however.
Antenna height as a great effect on take off angle, typically lower angle at
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:amradio-
> [EMAIL PROTECTED] On Behalf Of Brian Carling
>
> The power may not be wasted very much in the tuner, BUT
> REFLECTED power goes back into the RF final and is disippated
> in the famil amplifier device(s) - at least many pe
Hi John,
Boy you can tell you are an AM'r with the long post! :>)
In some of the following I am saying the same thing as John with a little
different explanation.
Some is a bit of a correction.
Lots of good stuff from John!
I don't consider myself an expert either.
This was going to be rather
>
> The point is, adjusting any one or combination of the following: the PA
> tank
> settings, the antenna tuner settings, the antenna turner coupling coil (if
> link coupling is used), the length of the open wire feeder, the length of
> the antenna, will affect the resonant frequency and thus t
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:amradio-
> [EMAIL PROTECTED] On Behalf Of Donald Chester
> Sent: Friday, April 21, 2006 7:15 PM
> To: amradio@mailman.qth.net
> Subject: RE: [AMRadio] antenna tuners
>
> >From: "Gary Schafer"
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:amradio-
> [EMAIL PROTECTED] On Behalf Of Donald Chester
> Sent: Friday, April 21, 2006 7:56 PM
> To: amradio@mailman.qth.net
> Subject: Re: [AMRadio] antenna tuners
>
>
> > > I don't believe in them.
> > >
> > > If you can't resona
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:amradio-
> [EMAIL PROTECTED] On Behalf Of kenw2dtc
> Sent: Friday, April 21, 2006 11:31 AM
> To: [EMAIL PROTECTED]; Discussion of AM Radio
> Subject: Re: [AMRadio] antenna tuners
>
> Gary K4FMX said:
>
> > By having the meter in th
insra.com - the CRA Website
> Now with PayPal
> CRA Nets: 3805 Khz every Monday at 8 PM EST
> and 14255 every Saturday at 12 Noon EST
> - Original Message -
> From: "Gary Schafer" <[EMAIL PROTECTED]>
> To: "'Discussion of AM Radio'"
&
This is another tidbit to keep in mind for those that still may think that
an antenna has to be resonant to give 1:1 swr.
A dipole antenna rarely is 50 ohms at resonance. It is very dependent on
height above ground as to what impedance it presents at the feed point. It
can range anywhere from bel
>
> Another factor causing loss with a high SWR is dielectric losses at the
> recurring high rf voltage points along the line. At low impedances, it is
> the resistive loss in the wire, and at high impedances, it is dielectric
> losses that combine to cause signal loss. But SWR is much, much l
Hi Alan,
No need to go away! You will get lots of good info here and asking /
discussing is how to understand.
As to resonant antennas, it makes no difference in how well they radiate.
Resonance of the antenna is not required.
SWR is not all that bad either as long as the transmitter sees a matc
EF Johnson mad a similar screen modulator to the one WRL made.
73
Gary K4FMX
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:amradio-
> [EMAIL PROTECTED] On Behalf Of Rev. Don Sanders
> Sent: Friday, April 14, 2006 11:56 AM
> To: Discussion of AM Radio
> Subject: Re: [AMRadio] Mo
For 1 amp an LM317 voltage regulator should work just fine. Then you can
just use a large capacitor on the supply in front of it and job done.
73
Gary K4FMX
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:amradio-
> [EMAIL PROTECTED] On Behalf Of Rick Brashear
> Sent: Wednesday, A
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:amradio-
> [EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
> Sent: Monday, March 27, 2006 10:23 PM
> To: [EMAIL PROTECTED]; [EMAIL PROTECTED]; amradio@mailman.qth.net
> Subject: Re: [AMRadio] RE: Modulator design needed
>
>
> In a
Monday, March 27, 2006 1:06 PM
> To: [EMAIL PROTECTED]; Discussion of AM Radio
> Subject: Re: Modulator design needed
>
> While other tubes may do better, I've had good luck using AB1 807s in
> VikingI/II/DX-100 class transmitters - they'll do 100% cleanly.
>
> -
Just remember if you are going to use a tube phase inverter rather than a
driver transformer the modulator tubes need to be run in AB1 and not AB2.
You can't run any grid current without a driver transformer.
This leaves out 807's as modulators as you can't get very much power out of
them in AB1 b
> If you want to hear your AM roundtable while you are called away to the
> telephone or using the bathroom, get a good speaker, attach it to your
> receiver, and turn up the volume.
>
An old cordless phone would do the trick.
73
Gary K4FMX
Actually the 10 watt ratting on the CE 10A/B is 10 watts PEP input. That
gives around 5 to 6 watts output PEP for available drive.
73
Gary K4FMX
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:amradio-
> [EMAIL PROTECTED] On Behalf Of Bob Bruhns
> Sent: Friday, February 17, 2006
He is telling you that a pair of 813's as a linear are good for only 125
watts of carrier output on AM and that it takes tubes with at least 800
watts plate dissipation to run the legal limit on AM linear.
73
Gary K4FMX
73
Gary K4FMX
> -Original Message-
> From: [EMAIL PROTECTED] [mail
Hi John,
I think this "hi-fi" thing gets carried a little far with a lot of people. I
agree with you that most sound "not so good" with narrow receiver filters.
Like you say unless it is a pretty much local qso you can't use wide
bandwidth on the receiver.
There is a lot of energy in the low fre
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of John E. Coleman (ARS
WA5BXO)
Sent: Tuesday, January 17, 2006 5:11 PM
To: 'Discussion of AM Radio'
Subject: RE: [AMRadio] Web page appears in opposition to RM-11306
As for measure of power, it was 1KW DC
in
Did you know that clipping an asymmetrical audio signal produces even order
harmonics where clipping symmetrical signals produces only odd order
products.
73
Gary K4FMX
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Bob Bruhns
Sent: Wednesday, January
If you over tighten the millen connectors they will crack the shell of the
chassis part pretty easily. You may not realize they have cracked. This can
be a leakage point.
73
Gary K4FMX
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of david knepper
Sent:
Hi Eddy,
The first thing I would do is get rid of those resistors and capacitors
across the diodes! They can cause more problems than they cure. Especially
if the resistors are carbon type. They change values tremendously. But if
you want to still use old vintage diodes you should have resistors a
s running at. The result was pretty
> > amazing since the overload point of this amplifier
> > went up about 25% from before when using a sustained
> > sine wave drive.
> >
> > The cathode bias situation with the 4-400 AB1 grid
> > driven amplifier is workable,
nd finally resorted to a T network on the
> input, loaded with about 2000 ohms worth of resistors.
>
> -Larry/NE1S
>
> Gary Schafer writes:
>
> > The input impedance should be very near what the value of the resistor
> is.
> > In this case 170 ohms. The 4-
The input impedance should be very near what the value of the resistor is.
In this case 170 ohms. The 4-400's will most likely be run in AB1 so no grid
current.
I would put in a 50 ohm resistor instead. You should get enough drive with
it. Figure what the bias voltage will be on the tubes. Then fig
quot;W5OMR/Geoff" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio"
Sent: Thursday, September 29, 2005 6:03 AM
Subject: Re: [AMRadio] GG 813 Linear in GE Ham News
Gary Schafer wrote:
A pair of 813s in GG are only good for 150 watts carrier out on AM.
73
Gary K4FMX
I
You got it Geoff!! :>)
73
Gary K4FMX
W5OMR/Geoff wrote:
Gary Schafer wrote:
See? I -knew- I was getting muddled again. (~sigh~)
Gary, let me apologize for not understanding your statements, but I'll
stand by what I said to be wholly true.
I've been corrected, and it'
W5OMR/Geoff wrote:
Hi Geoff,
Yes both statements are true. Remember that the PEP is 4 times the
carrier power with a 100% modulated AM signal.
if it's modulated with a sine-wave, that's a true statement.
A pair of 813s are good for about 600 watts PEP output. So that limits
carrier p
re, but 200 watts? I don't think so. Maybe those broadband
couplers in the patented 600L somehow boost the efficiency. I have never
figured out why the 600L can do that.
Jim
WD5JKO
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Gary Schafer
Sent: Wednesday
Hi Eddy,
Yes that is also a good rule.
73
Gary K4FMX
[EMAIL PROTECTED] wrote:
Gary...
Look at the tube charts for the tube(s) you are planning to use, take note
of the plate dissipation...your carrier output should be HALF of that
figure for safe use as an AM linear.
~73~ Eddy VE3CUI - VE3X
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