Re: [AMRadio] Home Brew

[Crawfish]

I am trying to figure out how to cathode modulate the 4-1000 I have. I have
a pair of 813's and have a 4-125. Have a bunch of 807's and 1625's as well.

Joe W4AAB
- Original Message -
From: <[EMAIL PROTECTED]>
To: 
Sent: Tuesday, September 28, 2004 6:47 PM
Subject: Re: [AMRadio] Home Brew


> There are all kinds of good designs in the 50's handbooks. The most fun
you
> will have is trying to find all the parts.
>
> 73,
>
>   John,  W4AWM
>
> << I'd like to build my own AM transmitter. Tube style; more than 200
watts. >
> >
> __
> AMRadio mailing list
> Home: http://mailman.qth.net/mailman/listinfo/amradio
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:AMRadio@mailman.qth.net
>

RE: [AMRadio] SB-220 controversy

[Cory Hine]

Hi Joe,

Looks like I found one Thanks for your efforts and
I wish David good luck with his. Sorry it didn't work
out...

Thanks,

Cory
--- "Joe A. Taylor" <[EMAIL PROTECTED]> wrote:

> Hi Cory:
>   Where are we on the K4PL David Welch SB-220?
> Do I need to be doing something?
> 
> >>Joe <<   [EMAIL PROTECTED]
> 
> 
> 
> 
> 
> 
> >From: Cory Hine <[EMAIL PROTECTED]>
> >Reply-To: Discussion of AM Radio
> 
> >To: amradio@mailman.qth.net
> >Subject: [AMRadio] SB-220 controversy
> >Date: Tue, 28 Sep 2004 16:05:33 -0700 (PDT)
> >
> >ALL,
> >
> >All I wanted was an amp didn't want to start a
> big
> >controversy. I now have a line on an amp and will
> get
> >it and put it on the air. At some point when I have
> >the funds I will put a big 813 rig on the air. That
> is
> >my goal, but doing it on the cheap for right now.
> >Thanks to all for the advice and leads on
> >equipment.
> >
> >Cory/AD5QP
> >
> >
> >
> >__
> >Do you Yahoo!?
> >New and Improved Yahoo! Mail - Send 10MB messages!
> >http://promotions.yahoo.com/new_mail
>
>__
> >AMRadio mailing list
> >Home:
> http://mailman.qth.net/mailman/listinfo/amradio
> >Help: http://mailman.qth.net/mmfaq.html
> >Post: mailto:AMRadio@mailman.qth.net
> 
> 
>
__
> AMRadio mailing list
> Home:
> http://mailman.qth.net/mailman/listinfo/amradio
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:AMRadio@mailman.qth.net
> 




__
Do you Yahoo!?
Yahoo! Mail - 50x more storage than other providers!
http://promotions.yahoo.com/new_mail

Re: [AMRadio] Home Brew

[Byron, W3WKR]

You might want to look at ebay.  There is a 2kw home brew that looks like
nice mechanical, but no modulator.
Byron

RE: [AMRadio] SIMPSON MAINTENANCE MANUAL

[Chuck Kembring]

Dave
The Triplett manuals are available on their website for download. I 
have a
couple of 603's and I think that is what you are referring to. They are a
VERY nice meter as well. I think their resistance scales are more inclusive.
Take Care,
73,
Chuck Kembring WB3LGG
Cochranville, Pa.
CRA #1341


-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of David Knepper
Sent: Tuesday, September 28, 2004 8:43 AM
To: Discussion of AM Radio
Subject: Re: [AMRadio] SIMPSON MAINTENANCE MANUAL


Don, would you have a Triplett VTVM/VOM in the black case.  It looks like a
260.

Thanks

Dave, W3ST
Publisher of the Collins Journal
Secretary to the Collins Radio Association
www.collinsra.com
Nets:  3805 Khz, Monday/Wednesdays 8 PM EDST
  14250 Khz Saturday, 12 Noon EDST

- Original Message -
From: "Merz Donald S" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio" 
Sent: Tuesday, September 28, 2004 10:36 AM
Subject: RE: [AMRadio] SIMPSON MAINTENANCE MANUAL


Good. I hope your meter never has a need for any of the procedures in there!

Personally, I find these old meters very likeable in all forms. You can go
to any hamfest and pick up a really nice old analog VTVM for $5. You could
quickly and cheaply have a house full of them. VOMs are more
expensive--isn't that odd?

I have one of the 260's numeric-readout successors--the Simpson 467. Runs on
a 9V battery and is bulletproof. It's a fine product also. OTOH, I also have
a Simpson meter (269? 369?--something ending in a 9) that has a large face
and claims to be a 100,000 ohms per volt VOM. This does not seem to be a
very good meter by comparison. It has not held up well over time.

73, Don Merz, N3RHT


-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of [EMAIL PROTECTED]
Sent: Monday, September 27, 2004 8:23 PM
To: amradio@mailman.qth.net
Subject: [AMRadio] SIMPSON MAINTENANCE MANUAL


Hi Don,

The envelope full of 260 info and your flier arrived safely today.  I sure
do
appreciate the time and effort that went into making copies and getting them
in the mail.  I have several 260s and swear by them when working with
boatanchors.

I recently picked up a 360 which looks the same as the 260 but with a
digital
readout in place of the analog meter. If you happen to have any info on this
one, I would be happy to pay for copies, etc.

Thanks again, you get the September Good Guy award in my book!

73,

John,  W4AWM
__
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net

The information contained in this e-mail may be confidential and is intended
solely for the use of the named addressee.
Access, copying or re-use of the e-mail or any information contained therein
by any other person is not authorized.
If you are not the intended recipient please notify us immediately by
returning the e-mail to the originator.(A)
__
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net

__
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net

RE: [AMRadio] Home Brew

[Brett gazdzinski]

Mostly depends on what you can get your hands on.
These days, you have to design around what you can get at a reasonable
price.

As far as tubes go, one or a pair of 813's works VERY well in the RF deck,
Pair of 811a or 812a tubes will also do nicely.
A 4-125 will work well at 2500 volts.

High voltage gets expensive, and the 811/812 tubes work from
1000 volts up to 2000.
813 likes 2000 but works lower.
The 4-125, 4-250, and 4-400 tubes like higher voltages.

A rice box makes a good RF exciter, and will drive 813's, 812a's, 4-125, etc
no problem.

For a modulator, KT90 tubes, 811a's, 813,s, 4-xxx will work,
The zero bias triodes are easy, no bias, drive the grids with
an 8 ohm to 6000 ohm output transformer using some solid state audio amp.

Choices are driven by what mod iron you can find, power transformers,
chokes, etc.

I have a homebrew pair of 813's in pie net 160 to 10 meters
Driven by a 4x150 (4cx250b) AB1 mod deck, I have a
Push pull pair of 812a's modulated by 811a's, and a pair
Of 4D32 tubes in pie net 40 meters only.

The old Bill Orr books have lots of good building stuff in them.

Brett
N2DTS




-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
Sent: Tuesday, September 28, 2004 3:50 PM
To: amradio@mailman.qth.net
Subject: [AMRadio] Home Brew


Hello All:

I'd like to build my own AM transmitter.
Tube style; more than 200 watts.

Sure a heck of a lot to choose from...but I'd like to hear what you think.


OR...if someone knows of a home brew for sale

Tnx,
Steve
WA2TAK __
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net

Re: [AMRadio] Home Brew

[W4AWM]

There are all kinds of good designs in the 50's handbooks. The most fun you 
will have is trying to find all the parts.

73,

  John,  W4AWM

<< I'd like to build my own AM transmitter. Tube style; more than 200 watts. >
>

RE: [AMRadio] SB-220 controversy

[Joe A. Taylor]

Hi Cory:
 Where are we on the K4PL David Welch SB-220?
Do I need to be doing something?


Joe <<   [EMAIL PROTECTED]








From: Cory Hine <[EMAIL PROTECTED]>
Reply-To: Discussion of AM Radio 
To: amradio@mailman.qth.net
Subject: [AMRadio] SB-220 controversy
Date: Tue, 28 Sep 2004 16:05:33 -0700 (PDT)

ALL,

All I wanted was an amp didn't want to start a big
controversy. I now have a line on an amp and will get
it and put it on the air. At some point when I have
the funds I will put a big 813 rig on the air. That is
my goal, but doing it on the cheap for right now.
Thanks to all for the advice and leads on
equipment.

Cory/AD5QP



__
Do you Yahoo!?
New and Improved Yahoo! Mail - Send 10MB messages!
http://promotions.yahoo.com/new_mail
__
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net

RE: [AMRadio] Home Brew

[John Coleman]

If I were going to build with tubes again and two hundred watts was
the carrier output that I wanted.  I would use a pair of 812s in push pull
class C and modulate with a pair of 811As push pull class B.  Run about 1500
volts @ 200 ma for 300 watts plate input on the 812s.  Find a Modulation
XFMR to match the output of 811A class B (about 12500 ohms as I remember) to
the 7500 ohm class C final. 

John, WA5BXO

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
Sent: Tuesday, September 28, 2004 2:50 PM
To: amradio@mailman.qth.net
Subject: [AMRadio] Home Brew

Hello All:

I'd like to build my own AM transmitter.
Tube style; more than 200 watts.

Sure a heck of a lot to choose from...but I'd like to hear what you think.


OR...if someone knows of a home brew for sale

Tnx,
Steve

Re: [AMRadio] Home Brew

[Neal Newman]

Build a Class E transmitter.
Parts for building a tube transmitter is getting harder to find everyday...

[EMAIL PROTECTED] wrote:


Hello All:

I'd like to build my own AM transmitter.
Tube style; more than 200 watts.

Sure a heck of a lot to choose from...but I'd like to hear what you think.


OR...if someone knows of a home brew for sale

Tnx,
Steve
WA2TAK
__
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net


 

[AMRadio] SB-220 controversy

[Cory Hine]

ALL,

All I wanted was an amp didn't want to start a big
controversy. I now have a line on an amp and will get
it and put it on the air. At some point when I have
the funds I will put a big 813 rig on the air. That is
my goal, but doing it on the cheap for right now.
Thanks to all for the advice and leads on
equipment.

Cory/AD5QP



__
Do you Yahoo!?
New and Improved Yahoo! Mail - Send 10MB messages!
http://promotions.yahoo.com/new_mail 

RE: [AMRadio] Gates BC250L efficiency

[Donald Chester]

I moved my BC1-T from 1230 kc to 160m, by proportionally scaling back the 
fixed capacitances in the PA tank circuit (both loading and plate tuning 
caps), readjusting the rotary and fixed inductors, and  getting the grid 
drive up to normal, and efficiency is about the same or  better  than it was 
on the BC band.


I replaced the PA grid/driver plate coil wound on the bakelite form with 
similar Miniductor coil stock and got a big boost in grid drive when I moved 
it to 160.  On 1230 it would make about 90 ma grid drive, but now I can get 
140 mills with full plate voltage, and 165 ma with plate voltage off.


Don K4KYV

[AMRadio] Home Brew

[StephenTetorka]

Hello All:

I'd like to build my own AM transmitter.
Tube style; more than 200 watts.

Sure a heck of a lot to choose from...but I'd like to hear what you think.


OR...if someone knows of a home brew for sale

Tnx,
Steve
WA2TAK

RE: [AMRadio] WTB SB-220

[George Pritchard]

Go from 1 million watts to 2 million watts and it's the same 3 dB. That's
expensive! That's where antenna gain is really cheap (assuming it doesn't
melt the ant). Dbs really get expensive once you get past 1KW. 
George AB2KC

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Edward B Richards
Sent: Tuesday, September 28, 2004 1:08 PM
To: amradio@mailman.qth.net
Subject: Re: [AMRadio] WTB SB-220


Hi Bret;

That could be because the ratio of 25 watts to 100 watts is 4, an increase
of 6 dB, while the ratio of 300 to 500 is 1.7, an increase of 2.2 dB and 300
to 600 is a ratio of 2 or 3 dB.

73, Ed Richards K6UUZ


On Tue, 28 Sep 2004 08:14:24 -0400 Brett gazdzinski
<[EMAIL PROTECTED]> writes:
> I know about the DB thing, but people running a bit of power always 
> seem much stronger than the guys running 25 or 50 watts.
> 
> I cant say why, but in a qso with a bunch of people, the guys running 
> 200 to 300 watts are always much stronger on the meter, and sounding,
> than the 50 watt guys.
> 
> For some reason, the biggest jump seems to be between about 25 watts 
> and 100 watts. I don't think you HEAR as much change between say 300 
> and 500 watts, or even 300 and 600 watts, but go between 25 and 100 
> watts and it seems very
> noticeable at the other end.
> 
> Maybe the losses in the antenna circuit are a much bigger percentage 
> of the power out when running 25 or 50 watts?
>  
> You can see the difference in signal strength when someone turns up
> the
> power,
> and it seems to track with the DB rule, but there still seems to be
> some threshold effect in most cases.
> With 25 watts, its hard to get clearly above the noise floor in many
> cases, while 100 watts and up does it easy in clear band conditions.
> 
> Most times, on clear conditions on 40 meters, the guy running the rice 
> box at 25 watts is just above the noise floor at about 1 s unit.
> He may run between s1 and s3.
> The guy running 100 watts will run s6 to s9 or higher, and be
> arm chair copy. That FIRST 3 to 6 db boost seems to be the most 
> critical. 
> 
> And I have NEVER heard someone running 25 watts and a REALLY good
> antenna
> out strapping a 500 watt rig into a regular antenna.
> 
> 
> And, although its easy to run an amp and boost power a little, it 
> seems crazy to run a pair of heavy tubes and get 300 watts out, when a 
> pair of 813 tubes plate modulated will do 700 watts of carrier easy, 
> and well over 2000 watts pep!
> 
> A pair of 812a's will give 300 watts carrier without trouble!
> 
> 
> Brett
> N2DTS
>   
> 
> 
> 
> -Original Message-
> From: [EMAIL PROTECTED] 
> [mailto:[EMAIL PROTECTED] On Behalf Of RJ Mattson
> Sent: Monday, September 27, 2004 7:07 PM
> To: Discussion of AM Radio
> Subject: Re: [AMRadio] WTB SB-220
> 
> 
> Again, It would be an S1 signal above a s9/30db level noise -  a
> barely
> perceivable difference. You would have to go from 100 to ~ 6,400 
> watts to
> get an S3 signal above that noise level.  bob...w2ami
> www.qrz.com/callsign/w2ami
> 
> 
> - Original Message -
> From: "George Pritchard" <[EMAIL PROTECTED]>
> To: "'Discussion of AM Radio'" 
> Sent: Monday, September 27, 2004 9:38 AM
> Subject: RE: [AMRadio] WTB SB-220
> 
> 
> > When the interference is also at 30 over S9(even if it's static
> > crashes) a 36 dB over signal using the 400 watts helps. First put 
> up
> > the best ant... Then crank-it with juice!!! George AB2KC 1KW 4X1 
> > lives
> >
> > -Original Message-
> > From: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED] On Behalf Of RJ Mattson
> > Sent: Monday, September 27, 2004 9:27 AM
> > To: Discussion of AM Radio
> > Subject: Re: [AMRadio] WTB SB-220
> >
> >
> > No matter what the spin, 100 to 400 watts is only 1 s-unit and
> barely
> > perceptible at the receiver. A 30db/s9 signal is from a good
> antenna
> > not from 100 or 400 watts.
> > bob...w2ami
> > www.qrz.com/callsign/w2ami
> >
> >
> > - Original Message -
> > From: "Jim Candela" <[EMAIL PROTECTED]>
> > To: 
> > Sent: Sunday, September 26, 2004 10:47 PM
> > Subject: Re: [AMRadio] WTB SB-220
> > >
> > > Hmmm, the boys on 3878 are running 1500 watts pep plus
> > > on USB, and there is a 100 watt AM'er calling CQ on
> > > 3880. How much of an antenna would the AM'er need to overcome
> the
> > > S/N ratio? I think Astabula Bill, W8VYZ says it all:
> > >
> > > http://www.amwindow.org/audio/mov/w8vyz.mov
> > >
> > > Ever hear Bill running 100 watts? When Bill and Less K6HQI (sk) 
> > > were regulars on 14286 they had to run heavy iron to hold the 
> > > frequency. A 100 watt rig was seldom heard whereas a 500 watt rig 
> > > (that 6db again) was often armchair copy, and sometimes often 
> > > drive the QRM away.
> > >
> > > Regards,
> > > Jim
> > >
> > > RJ Mattson <[EMAIL PROTECTED]> wrote:
> > > If you can't get out consistantly with a Viking II,
> > > you need an antenna -
> > > not an amp.
> > > bob...w2ami
> > > www.qrz.com/callsign/w2ami
> >
> >

[AMRadio] Re: AMRadio Digest, Vol 8, Issue 32

[Rivpapa1]

If you can't get out with a nice signal using a viking 2..Give the rig to 
me...73's Ron..W6MAU 

[AMRadio] Gates BC250L efficiency

[K9AF]

Hello to all
I have  a Gates BC250L AM broadcast transmitter that was recently taken out 
of service.  Before converting it, I fired it up into a dummy load, and 
measured all parameters.  It made a solid 250 watts, as it was intended, and 
was 
capable of  300 watts or more.   It had approximately 73% efficiency, which 
according to the Gates owner's manual was correct (72 to 75%)After 
converting it 
to 160 meters, scaling the components, reneutralizing the finals, and 
retuning it, I can still get 250 watts out with little difficulty, BUT my 
efficiency 
has dropped to 61%.  I cannot change lead lengths, due to its construction.  
Does anyone have any ideas?  While 61% isn't bad, it's not what I had on the 
broadcast band.   Many thanks.

73

Jerry K9AF

[AMRadio] TS-505 Manuals in PDF format available

[Rbethman]

Group,

   I still have the TS-505 VTVM manuals available to mail to anyone 
whom asks for them.


   They are zipped and are 711KB in size.

   Holler if you need them!

Bob - N0DGN

--
<  Bob Bethman - N0DGN
+---+--+
| N0DGN AMRadio Manassas, VA|REAL Tube Radio and AM|
+---+--+
|   Manassas Radio - Home of Homemade Kielbasa & Pirogi|
+---+--+
| Bob Bethman\\\|/// " The absence of a danger |
| rbethman(at)comcast.net   \\ ~ ~ //  signal does *NOT* mean  |
|   (/ @ @ /)  that everything is OK " |
+-oOOo-(_)-oOOo+
|   |
| 1 BC-610I w/BC-614I,1 T-213/GRC-26 w/BC614I 1 '51 Collins R-390A |
| 1 '67 EAC R-390A, Heathkit DX-60, Apache, Mohawk, SX-101, HT-32A |
+--+
|   Amateur Astronomer - Celestron Nexstar 8   |
| 12" f5 Dob coming soon!  Being built |
|  Meade ETX-60 (Got it back!) |
|   38 Deg 46.8' N - 77 Deg 28.5' W|
+--+
|   Opinions expressed are that of my own and do not necessarily   |
| coincide with or represent those of ANYONE else  |
+--+
 ALL E-mail received and sent scanned by AVG & Norton Anti-Virus>

Re: [AMRadio] WTB SB-220

[Edward B Richards]

Hi Bret;

That could be because the ratio of 25 watts to 100 watts is 4, an
increase of 6 dB, while the ratio of 300 to 500 is 1.7, an increase of
2.2 dB and 300 to 600 is a ratio of 2 or 3 dB.

73, Ed Richards K6UUZ


On Tue, 28 Sep 2004 08:14:24 -0400 Brett gazdzinski
<[EMAIL PROTECTED]> writes:
> I know about the DB thing, but people running a bit of power always
> seem much stronger than the guys running 25 or 50 watts.
> 
> I cant say why, but in a qso with a bunch of people, the guys
> running 200 to 300 watts are always much stronger on the meter, and
> sounding,
> than the 50 watt guys.
> 
> For some reason, the biggest jump seems to be between about 25 watts
> and 100 watts.
> I don't think you HEAR as much change between say 300 and 500 watts,
> or even 300 and 600 watts, but go between 25 and 100 watts and it 
> seems very
> noticeable at the other end.
> 
> Maybe the losses in the antenna circuit are a much bigger percentage
> of the power out when running 25 or 50 watts?
>  
> You can see the difference in signal strength when someone turns up 
> the
> power,
> and it seems to track with the DB rule, but there still seems to be
> some threshold effect in most cases.
> With 25 watts, its hard to get clearly above the noise floor in many
> cases, while 100 watts and up does it easy in clear band conditions.
> 
> Most times, on clear conditions on 40 meters, the guy running the
> rice box at 25 watts is just above the noise floor at about 1 s 
> unit.
> He may run between s1 and s3.
> The guy running 100 watts will run s6 to s9 or higher, and be
> arm chair copy. That FIRST 3 to 6 db boost seems to be the most 
> critical. 
> 
> And I have NEVER heard someone running 25 watts and a REALLY good 
> antenna
> out strapping a 500 watt rig into a regular antenna.
> 
> 
> And, although its easy to run an amp and boost power a little, it
> seems crazy to run a pair of heavy tubes and get 300 watts out,
> when a pair of 813 tubes plate modulated will do 700 watts
> of carrier easy, and well over 2000 watts pep!
> 
> A pair of 812a's will give 300 watts carrier without trouble!
> 
> 
> Brett
> N2DTS
>   
> 
> 
> 
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of RJ Mattson
> Sent: Monday, September 27, 2004 7:07 PM
> To: Discussion of AM Radio
> Subject: Re: [AMRadio] WTB SB-220
> 
> 
> Again, It would be an S1 signal above a s9/30db level noise -  a 
> barely
> perceivable difference. You would have to go from 100 to ~ 6,400 
> watts to
> get an S3 signal above that noise level.  bob...w2ami
> www.qrz.com/callsign/w2ami
> 
> 
> - Original Message - 
> From: "George Pritchard" <[EMAIL PROTECTED]>
> To: "'Discussion of AM Radio'" 
> Sent: Monday, September 27, 2004 9:38 AM
> Subject: RE: [AMRadio] WTB SB-220
> 
> 
> > When the interference is also at 30 over S9(even if it's static 
> > crashes) a 36 dB over signal using the 400 watts helps. First put 
> up 
> > the best ant... Then crank-it with juice!!! George AB2KC
> > 1KW 4X1 lives
> >
> > -Original Message-
> > From: [EMAIL PROTECTED] 
> > [mailto:[EMAIL PROTECTED] On Behalf Of RJ Mattson
> > Sent: Monday, September 27, 2004 9:27 AM
> > To: Discussion of AM Radio
> > Subject: Re: [AMRadio] WTB SB-220
> >
> >
> > No matter what the spin, 100 to 400 watts is only 1 s-unit and 
> barely 
> > perceptible at the receiver. A 30db/s9 signal is from a good 
> antenna 
> > not from 100 or 400 watts.
> > bob...w2ami
> > www.qrz.com/callsign/w2ami
> >
> >
> > - Original Message -
> > From: "Jim Candela" <[EMAIL PROTECTED]>
> > To: 
> > Sent: Sunday, September 26, 2004 10:47 PM
> > Subject: Re: [AMRadio] WTB SB-220
> > >
> > > Hmmm, the boys on 3878 are running 1500 watts pep plus
> > > on USB, and there is a 100 watt AM'er calling CQ on
> > > 3880. How much of an antenna would the AM'er need to overcome 
> the 
> > > S/N ratio? I think Astabula Bill, W8VYZ says it all:
> > >
> > > http://www.amwindow.org/audio/mov/w8vyz.mov
> > >
> > > Ever hear Bill running 100 watts? When Bill and Less
> > > K6HQI (sk) were regulars on 14286 they had to run
> > > heavy iron to hold the frequency. A 100 watt rig was
> > > seldom heard whereas a 500 watt rig (that 6db again)
> > > was often armchair copy, and sometimes often drive the
> > > QRM away.
> > >
> > > Regards,
> > > Jim
> > >
> > > RJ Mattson <[EMAIL PROTECTED]> wrote:
> > > If you can't get out consistantly with a Viking II,
> > > you need an antenna -
> > > not an amp.
> > > bob...w2ami
> > > www.qrz.com/callsign/w2ami
> >
> >
> > __
> > AMRadio mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/amradio
> > Help: http://mailman.qth.net/mmfaq.html
> > Post: mailto:AMRadio@mailman.qth.net
> >
> > __
> > AMRadio mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/amradio
> > Help: http://mailman.qth.net/mmfaq.h

Re: [AMRadio] WTB SB-220

[peter A Markavage]

I call it receiver capture. There is a certain level of power required by
the transmitter for the receiver at the other end to capture the signal
carrier through the noise and QRM. Once the receiver captures the signal,
barring strong fading, local interference, sun activity, etc., any
increase in power would be insignificant to the receiver. Most of the
current solid state transceivers run about 25 to 40 watts on AM
(depending on the model) and use low-level modulation. There isn't a lot
of zing to the audio when the receiver at the other end is receiving it
at QRM threshold. Adding a linear to these rigs and/or better antenna
helps the receiver capture.

If you're a builder, build a bigger transmitter. If you have neither the
time or ambition to build, a linear is an easy way to get a better signal
presence. Of course, a crappy antenna is still a crappy antenna whether
you run low or high power.

Pete, wa2cwa

On Tue, 28 Sep 2004 08:14:24 -0400 Brett gazdzinski
<[EMAIL PROTECTED]> writes:
> I know about the DB thing, but people running a bit of power always
> seem much stronger than the guys running 25 or 50 watts.
> 
> I cant say why, but in a qso with a bunch of people, the guys
> running 200 to 300 watts are always much stronger on the meter, and
> sounding,
> than the 50 watt guys.
> 
> For some reason, the biggest jump seems to be between about 25 
> watts
> and 100 watts.
> I don't think you HEAR as much change between say 300 and 500 
> watts,
> or even 300 and 600 watts, but go between 25 and 100 watts and it 
> seems very
> noticeable at the other end.
> 
> Maybe the losses in the antenna circuit are a much bigger 
> percentage
> of the power out when running 25 or 50 watts?
>  
> You can see the difference in signal strength when someone turns up 
> the
> power,
> and it seems to track with the DB rule, but there still seems to be
> some threshold effect in most cases.
> With 25 watts, its hard to get clearly above the noise floor in 
> many
> cases, while 100 watts and up does it easy in clear band 
> conditions.
> 
> Most times, on clear conditions on 40 meters, the guy running the
> rice box at 25 watts is just above the noise floor at about 1 s 
> unit.
> He may run between s1 and s3.
> The guy running 100 watts will run s6 to s9 or higher, and be
> arm chair copy. That FIRST 3 to 6 db boost seems to be the most 
> critical. 
> 
> And I have NEVER heard someone running 25 watts and a REALLY good 
> antenna
> out strapping a 500 watt rig into a regular antenna.
> 
> 
> And, although its easy to run an amp and boost power a little, it
> seems crazy to run a pair of heavy tubes and get 300 watts out,
> when a pair of 813 tubes plate modulated will do 700 watts
> of carrier easy, and well over 2000 watts pep!
> 
> A pair of 812a's will give 300 watts carrier without trouble!
> 
> 
> Brett
> N2DTS
>   
> 
> 
> 
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of RJ Mattson
> Sent: Monday, September 27, 2004 7:07 PM
> To: Discussion of AM Radio
> Subject: Re: [AMRadio] WTB SB-220
> 
> 
> Again, It would be an S1 signal above a s9/30db level noise -  a 
> barely
> perceivable difference. You would have to go from 100 to ~ 6,400 
> watts to
> get an S3 signal above that noise level.  bob...w2ami
> www.qrz.com/callsign/w2ami
> 
> 
> - Original Message - 
> From: "George Pritchard" <[EMAIL PROTECTED]>
> To: "'Discussion of AM Radio'" 
> Sent: Monday, September 27, 2004 9:38 AM
> Subject: RE: [AMRadio] WTB SB-220
> 
> 
> > When the interference is also at 30 over S9(even if it's static 
> > crashes) a 36 dB over signal using the 400 watts helps. First put 
> up 
> > the best ant... Then crank-it with juice!!! George AB2KC
> > 1KW 4X1 lives
> >
> > -Original Message-
> > From: [EMAIL PROTECTED] 
> > [mailto:[EMAIL PROTECTED] On Behalf Of RJ Mattson
> > Sent: Monday, September 27, 2004 9:27 AM
> > To: Discussion of AM Radio
> > Subject: Re: [AMRadio] WTB SB-220
> >
> >
> > No matter what the spin, 100 to 400 watts is only 1 s-unit and 
> barely 
> > perceptible at the receiver. A 30db/s9 signal is from a good 
> antenna 
> > not from 100 or 400 watts.
> > bob...w2ami
> > www.qrz.com/callsign/w2ami
> >
> >
> > - Original Message -
> > From: "Jim Candela" <[EMAIL PROTECTED]>
> > To: 
> > Sent: Sunday, September 26, 2004 10:47 PM
> > Subject: Re: [AMRadio] WTB SB-220
> > >
> > > Hmmm, the boys on 3878 are running 1500 watts pep plus
> > > on USB, and there is a 100 watt AM'er calling CQ on
> > > 3880. How much of an antenna would the AM'er need to overcome 
> the 
> > > S/N ratio? I think Astabula Bill, W8VYZ says it all:
> > >
> > > http://www.amwindow.org/audio/mov/w8vyz.mov
> > >
> > > Ever hear Bill running 100 watts? When Bill and Less
> > > K6HQI (sk) were regulars on 14286 they had to run
> > > heavy iron to hold the frequency. A 100 watt rig was
> > > seldom heard whereas a 500 watt rig (that 6db again)
> > > was often armchair cop

Re: [AMRadio] SIMPSON MAINTENANCE MANUAL

[David Knepper]

Don, would you have a Triplett VTVM/VOM in the black case.  It looks like a
260.

Thanks

Dave, W3ST
Publisher of the Collins Journal
Secretary to the Collins Radio Association
www.collinsra.com
Nets:  3805 Khz, Monday/Wednesdays 8 PM EDST
  14250 Khz Saturday, 12 Noon EDST

- Original Message -
From: "Merz Donald S" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio" 
Sent: Tuesday, September 28, 2004 10:36 AM
Subject: RE: [AMRadio] SIMPSON MAINTENANCE MANUAL


Good. I hope your meter never has a need for any of the procedures in there!

Personally, I find these old meters very likeable in all forms. You can go
to any hamfest and pick up a really nice old analog VTVM for $5. You could
quickly and cheaply have a house full of them. VOMs are more
expensive--isn't that odd?

I have one of the 260's numeric-readout successors--the Simpson 467. Runs on
a 9V battery and is bulletproof. It's a fine product also. OTOH, I also have
a Simpson meter (269? 369?--something ending in a 9) that has a large face
and claims to be a 100,000 ohms per volt VOM. This does not seem to be a
very good meter by comparison. It has not held up well over time.

73, Don Merz, N3RHT


-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of [EMAIL PROTECTED]
Sent: Monday, September 27, 2004 8:23 PM
To: amradio@mailman.qth.net
Subject: [AMRadio] SIMPSON MAINTENANCE MANUAL


Hi Don,

The envelope full of 260 info and your flier arrived safely today.  I sure
do
appreciate the time and effort that went into making copies and getting them
in the mail.  I have several 260s and swear by them when working with
boatanchors.

I recently picked up a 360 which looks the same as the 260 but with a
digital
readout in place of the analog meter. If you happen to have any info on this
one, I would be happy to pay for copies, etc.

Thanks again, you get the September Good Guy award in my book!

73,

John,  W4AWM
__
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net

The information contained in this e-mail may be confidential and is intended
solely for the use of the named addressee.
Access, copying or re-use of the e-mail or any information contained therein
by any other person is not authorized.
If you are not the intended recipient please notify us immediately by
returning the e-mail to the originator.(A)
__
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net

RE: [AMRadio] SIMPSON MAINTENANCE MANUAL

[Merz Donald S]

Good. I hope your meter never has a need for any of the procedures in there!

Personally, I find these old meters very likeable in all forms. You can go to 
any hamfest and pick up a really nice old analog VTVM for $5. You could quickly 
and cheaply have a house full of them. VOMs are more expensive--isn't that odd?

I have one of the 260's numeric-readout successors--the Simpson 467. Runs on a 
9V battery and is bulletproof. It's a fine product also. OTOH, I also have a 
Simpson meter (269? 369?--something ending in a 9) that has a large face and 
claims to be a 100,000 ohms per volt VOM. This does not seem to be a very good 
meter by comparison. It has not held up well over time.

73, Don Merz, N3RHT


-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of [EMAIL PROTECTED]
Sent: Monday, September 27, 2004 8:23 PM
To: amradio@mailman.qth.net
Subject: [AMRadio] SIMPSON MAINTENANCE MANUAL


Hi Don,

The envelope full of 260 info and your flier arrived safely today.  I sure do 
appreciate the time and effort that went into making copies and getting them 
in the mail.  I have several 260s and swear by them when working with 
boatanchors. 

I recently picked up a 360 which looks the same as the 260 but with a digital 
readout in place of the analog meter. If you happen to have any info on this 
one, I would be happy to pay for copies, etc.

Thanks again, you get the September Good Guy award in my book!

73,  

John,  W4AWM
__
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net
 
The information contained in this e-mail may be confidential and is intended 
solely for the use of the named addressee.
Access, copying or re-use of the e-mail or any information contained therein by 
any other person is not authorized.
If you are not the intended recipient please notify us immediately by returning 
the e-mail to the originator.(A)

Re: [AMRadio] WTB SB-220

[Larry Roohr]

Cory,

There's an sb-200 listed for sale here, in Colorado:

http://www.qsl.net/n0ara/swaplist.html


Larry

RE: [AMRadio] WTB SB-220

[George Pritchard]

An S1 signal above the noise level IS the difference to being heard or not.
The same is true if the band is on the way out... And the backscatter signal
is kicked up 6 dB or better... At least you can "finish-out" the QSO with
QRO. It's nice to have the juice when you need it. QRO is also fun on Ten
meters with marginal band openings.
George AB2KC
4X1 plate modulation lives on TEN meters

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of RJ Mattson
Sent: Monday, September 27, 2004 7:07 PM
To: Discussion of AM Radio
Subject: Re: [AMRadio] WTB SB-220


Again, It would be an S1 signal above a s9/30db level noise -  a barely
perceivable difference. You would have to go from 100 to ~ 6,400 watts to
get an S3 signal above that noise level.  bob...w2ami
www.qrz.com/callsign/w2ami


- Original Message - 
From: "George Pritchard" <[EMAIL PROTECTED]>
To: "'Discussion of AM Radio'" 
Sent: Monday, September 27, 2004 9:38 AM
Subject: RE: [AMRadio] WTB SB-220


> When the interference is also at 30 over S9(even if it's static 
> crashes) a 36 dB over signal using the 400 watts helps. First put up 
> the best ant... Then crank-it with juice!!! George AB2KC
> 1KW 4X1 lives
>
> -Original Message-
> From: [EMAIL PROTECTED] 
> [mailto:[EMAIL PROTECTED] On Behalf Of RJ Mattson
> Sent: Monday, September 27, 2004 9:27 AM
> To: Discussion of AM Radio
> Subject: Re: [AMRadio] WTB SB-220
>
>
> No matter what the spin, 100 to 400 watts is only 1 s-unit and barely 
> perceptible at the receiver. A 30db/s9 signal is from a good antenna 
> not from 100 or 400 watts.
> bob...w2ami
> www.qrz.com/callsign/w2ami
>
>
> - Original Message -
> From: "Jim Candela" <[EMAIL PROTECTED]>
> To: 
> Sent: Sunday, September 26, 2004 10:47 PM
> Subject: Re: [AMRadio] WTB SB-220
> >
> > Hmmm, the boys on 3878 are running 1500 watts pep plus
> > on USB, and there is a 100 watt AM'er calling CQ on
> > 3880. How much of an antenna would the AM'er need to overcome the 
> > S/N ratio? I think Astabula Bill, W8VYZ says it all:
> >
> > http://www.amwindow.org/audio/mov/w8vyz.mov
> >
> > Ever hear Bill running 100 watts? When Bill and Less
> > K6HQI (sk) were regulars on 14286 they had to run
> > heavy iron to hold the frequency. A 100 watt rig was
> > seldom heard whereas a 500 watt rig (that 6db again)
> > was often armchair copy, and sometimes often drive the
> > QRM away.
> >
> > Regards,
> > Jim
> >
> > RJ Mattson <[EMAIL PROTECTED]> wrote:
> > If you can't get out consistantly with a Viking II,
> > you need an antenna -
> > not an amp.
> > bob...w2ami
> > www.qrz.com/callsign/w2ami
>
>
> __
> AMRadio mailing list
> Home: http://mailman.qth.net/mailman/listinfo/amradio
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:AMRadio@mailman.qth.net
>
> __
> AMRadio mailing list
> Home: http://mailman.qth.net/mailman/listinfo/amradio
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:AMRadio@mailman.qth.net
>


__
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net

RE: [AMRadio] WTB SB-220

[Brett gazdzinski]

I know about the DB thing, but people running a bit of power always
seem much stronger than the guys running 25 or 50 watts.

I cant say why, but in a qso with a bunch of people, the guys
running 200 to 300 watts are always much stronger on the meter, and
sounding,
than the 50 watt guys.

For some reason, the biggest jump seems to be between about 25 watts
and 100 watts.
I don't think you HEAR as much change between say 300 and 500 watts,
or even 300 and 600 watts, but go between 25 and 100 watts and it seems very
noticeable at the other end.

Maybe the losses in the antenna circuit are a much bigger percentage
of the power out when running 25 or 50 watts?
 
You can see the difference in signal strength when someone turns up the
power,
and it seems to track with the DB rule, but there still seems to be
some threshold effect in most cases.
With 25 watts, its hard to get clearly above the noise floor in many
cases, while 100 watts and up does it easy in clear band conditions.

Most times, on clear conditions on 40 meters, the guy running the
rice box at 25 watts is just above the noise floor at about 1 s unit.
He may run between s1 and s3.
The guy running 100 watts will run s6 to s9 or higher, and be
arm chair copy. That FIRST 3 to 6 db boost seems to be the most critical. 

And I have NEVER heard someone running 25 watts and a REALLY good antenna
out strapping a 500 watt rig into a regular antenna.


And, although its easy to run an amp and boost power a little, it
seems crazy to run a pair of heavy tubes and get 300 watts out,
when a pair of 813 tubes plate modulated will do 700 watts
of carrier easy, and well over 2000 watts pep!

A pair of 812a's will give 300 watts carrier without trouble!


Brett
N2DTS
  



-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of RJ Mattson
Sent: Monday, September 27, 2004 7:07 PM
To: Discussion of AM Radio
Subject: Re: [AMRadio] WTB SB-220


Again, It would be an S1 signal above a s9/30db level noise -  a barely
perceivable difference. You would have to go from 100 to ~ 6,400 watts to
get an S3 signal above that noise level.  bob...w2ami
www.qrz.com/callsign/w2ami


- Original Message - 
From: "George Pritchard" <[EMAIL PROTECTED]>
To: "'Discussion of AM Radio'" 
Sent: Monday, September 27, 2004 9:38 AM
Subject: RE: [AMRadio] WTB SB-220


> When the interference is also at 30 over S9(even if it's static 
> crashes) a 36 dB over signal using the 400 watts helps. First put up 
> the best ant... Then crank-it with juice!!! George AB2KC
> 1KW 4X1 lives
>
> -Original Message-
> From: [EMAIL PROTECTED] 
> [mailto:[EMAIL PROTECTED] On Behalf Of RJ Mattson
> Sent: Monday, September 27, 2004 9:27 AM
> To: Discussion of AM Radio
> Subject: Re: [AMRadio] WTB SB-220
>
>
> No matter what the spin, 100 to 400 watts is only 1 s-unit and barely 
> perceptible at the receiver. A 30db/s9 signal is from a good antenna 
> not from 100 or 400 watts.
> bob...w2ami
> www.qrz.com/callsign/w2ami
>
>
> - Original Message -
> From: "Jim Candela" <[EMAIL PROTECTED]>
> To: 
> Sent: Sunday, September 26, 2004 10:47 PM
> Subject: Re: [AMRadio] WTB SB-220
> >
> > Hmmm, the boys on 3878 are running 1500 watts pep plus
> > on USB, and there is a 100 watt AM'er calling CQ on
> > 3880. How much of an antenna would the AM'er need to overcome the 
> > S/N ratio? I think Astabula Bill, W8VYZ says it all:
> >
> > http://www.amwindow.org/audio/mov/w8vyz.mov
> >
> > Ever hear Bill running 100 watts? When Bill and Less
> > K6HQI (sk) were regulars on 14286 they had to run
> > heavy iron to hold the frequency. A 100 watt rig was
> > seldom heard whereas a 500 watt rig (that 6db again)
> > was often armchair copy, and sometimes often drive the
> > QRM away.
> >
> > Regards,
> > Jim
> >
> > RJ Mattson <[EMAIL PROTECTED]> wrote:
> > If you can't get out consistantly with a Viking II,
> > you need an antenna -
> > not an amp.
> > bob...w2ami
> > www.qrz.com/callsign/w2ami
>
>
> __
> AMRadio mailing list
> Home: http://mailman.qth.net/mailman/listinfo/amradio
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:AMRadio@mailman.qth.net
>
> __
> AMRadio mailing list
> Home: http://mailman.qth.net/mailman/listinfo/amradio
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:AMRadio@mailman.qth.net
>


__
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net