Re: [AMRadio] The AM Window

[peter A Markavage]

Actually Geoff, in a number of published band plans, including the
ARRL's, 29.0 to 29.2 is actually designated as an AM slice of
frequencies. Not that we have exclusive use but at least a "noted
agreement". And, as I had been saying in earlier e-mails, like yourself,
3885, 7290, 14.286, 50.4 are designated as merely calling frequencies.
But, like all things human, amateur calls CQ on the calling frequency,
makes a contact, and then doesn't QSY. After years of doing this, AM'ers
wanting to start there own QSO, move up 3, 5 or 10 KHz's in either
direction of the calling frequency, and hence the formalization of the
imaginary window. The rest of the band could be void of signals to move
30, 40, 50 KHz away but generally it seems hard to grasp. The reasons, as
mentioned earlier, antenna is cut for 3885, have no VFO, have only 1
crystal, SSB'ers will get mad at me, transmitter is only tuned for 3885,
etc., etc. always seem to be the answers.

Anyway, this past Sunday, listening on 75 in the late afternoon, at one
point there were AM QSO's on 3810, 3825, 3837(AWA net meets around here),
3852, 3860, 3875, and 3885. Most weekends, at least here in the
Northeast, a number of AM'ers have at least found the VFO knob, and have
moved to other parts of the band. I'm willing to bet, at least here in
the Northeast/middle Atlantic area,  there will more of this type
spreading out throughout the holiday week.

Pete, wa2cwa

On Tue, 21 Dec 2004 19:40:13 -0600 "Geoff/W5OMR"
<[EMAIL PROTECTED]> writes:
> 
> > Quote - "...to have a one to one contact but if this were the case 
> then
> > 3880-3890 will only have 6 AM Stations on it at a time."
> 
> > You hit the nail on the head. So I guess, unless I want to break 
> into a
> > one-on-one discussion, even through I may have no interest in what 
> the
> > discussion is about, I should shut down the rig and go and do 
> something
> > else. Unfortunately, my perception of many "AM Windowers" is like 
> timid
> > sheep in a pen with no gate.
> 
> Nothing anywhere says you can not operate AM mode anywhere in the
> phone band your license will allow you to operate.
> 
> There is no "Window", just a calling freq of 3.885.  Same on 10m - 
> the AM
> calling frequency is 29.00.  Just like 146.52, and 52.525Mc, those 
> simplex
> "calling frequencies" are just that, and as soon as you establish 
> contact,
> move off of the calling frequency (where*EVER* you can find a clear 
> spot)
> and move your conversation (phone)/QSO (CW) there.  (CW is allowed
> everywhere still, right? ;-))
> 
> So, if I call CQ on 3.885, and there's an AM conversation on 3.880 
> and another
> on 3.890, I'm gonna go hunt up/down and find a hole somewhere else 
> that
> this station and I can mutually work, together.  I, being the Extra, 
> would ask
> the other party where he'd be comfortable at.  3.870?  3.875?  
> 3.753.45?
>  I -have-
> a VFO, so it don't matter.
> 
> Speaking of which... Not Having a VFO is no excuse, either.  If 
> you've a
> crystal, you can feed a vfo signal in that same socket.  Even if 
> it's only a
> low-
> level output from a ricebox, you can feed a small amount of RF in 
> there, to
> make that old rig frequency agile.
> 
> I conlude that the general concession is that a lot of the "local 
> discussions"
> on
> 75m is, well.. let's just say it's not fit for mixed company.  Not 
> that I'm a
> prude,
> but I also get that more gentlemen operate AM than there are 
> Gentlemen on
> most SSB frequencies.  Being polite Gentlemen, and not being 
> diliberate, why
> -not- fire up AM QSO's, starting at 3.753 (if the frequency is 
> clear) and having
> a pair of guys every 6kc (when possible) and fill the whole cotton 
> pickin' band
> with AM.  THEN, when the Sidebanders whine and complain about ALL 
> the
> AM, we -could- say "Fine.  We'll confine ourselves to these 30kc 
> *if* you
> keep your SSB QSO's off of say between 3.860 to 3.890."  But, then 
> that puts
> us back in a "window" or a box, if you will.  No.. upon further 
> reflection, I
> believe that operating an AM rig anywhere you're allowed phone 
> operation
> is what the answer is.  Being limited to 3.870/75/80/85 and 90 on 
> 75m is -not-
> conducive to further growth of our little spectrum of the hobby.
> 
> If we want to 'raise the level of politeness' on 75m, then let's get 
> AM'ers on
> the band, starting from 3.753, and getting a qso going every 6kc up 
> the band.
> 
> Getting everyone on, at the same time, is a logistical nightmare, 
> but a -lot- of
> people have a -lot- more free-time during the holiday season.
> 
> Any suggestions as to when this should happen?
> 
> 73 = Best Regards,
> -Geoff/W5OMR

[AMRadio] AM Rig available

[Brian Carling]

This may interest some of our AM friends in the "frozen north."

Usual disclaimers.

- Original Message -
From: Roger Parsons <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, December 20, 2004 5:44 AM
Subject: [Amps] Marconi AM Transmitter

> A friend of mine (VE3AC) has an old (1952) Marconi
> 500W AM transmitter, which is ex Canadian military and
> covers 1.5-15MHz. It uses a pair of 4-125s in both PA
> and modulator. It is very nice, but also very heavy!
>
> Does anybody know if this is worth anything, or
> collectable, or would he be best to take it apart and
> sell the tubes/vacuum variable/transformers etc?
>
> Thanks
> 73 Roger
> VE3ZI

Re: [AMRadio] The AM Window

[Brian Carling]

Well if they use "offensive language" it is guaranteed that they
will probably get the attention that they so desperately crave. 
That is basically what it is down to, for these insignificant, 
self-loathing babies that try so hard to offend others. They 
are really just a little child inside an adult body, just hoping 
that someone, somewhere will notice that they exist.

I'm glad most hams are not that psychotic.  Yes, a few AM ops 
in the northeast go off the deep end, but I always get a good laugh
out of them, even if they embarrass me. Most of it is really 
good-natured and not intended to harm anyone else. The slop
bucket ops , on the other hand, can be an entirely different kettle 
of squids.

On 21 Dec 2004 at 21:53, Paul Sokoloff wrote:

> Hello gentlemen,
> I have been enjoying the conversation here and I agree with Geoff.  As a
> relatively new AMer we need to find a hole and call CQ.  The trick is that
> the rest of us have to tune the entire band looking for QSOs.
> I had an interesting experience a few Saturday evenings ago.  There were
> NO QSOs in the AM window at 10pm.  I called CQ for 30 minutes and got no
> response.  What happened to everyone?
> There are a few AM folks here in the northeast who use somewhat
> offensive language on the air.  It is really ashame and does give us a bad
> name.  Anyway enjoy the bands while we have them.  See you on the air.
> 
> 73s,  Paul   WA3GFZ
> 
> 
> 
> - Original Message - 
> From: "Geoff/W5OMR" <[EMAIL PROTECTED]>
> To: "Discussion of AM Radio" 
> Sent: Tuesday, December 21, 2004 8:40 PM
> Subject: Re: [AMRadio] The AM Window
> 
> 
> >
> > > Quote - "...to have a one to one contact but if this were the case then
> > > 3880-3890 will only have 6 AM Stations on it at a time."
> >
> > > You hit the nail on the head. So I guess, unless I want to break into a
> > > one-on-one discussion, even through I may have no interest in what the
> > > discussion is about, I should shut down the rig and go and do something
> > > else. Unfortunately, my perception of many "AM Windowers" is like timid
> > > sheep in a pen with no gate.
> >
> > Nothing anywhere says you can not operate AM mode anywhere in the
> > phone band your license will allow you to operate.
> >
> > There is no "Window", just a calling freq of 3.885.  Same on 10m - the AM
> > calling frequency is 29.00.  Just like 146.52, and 52.525Mc, those simplex
> > "calling frequencies" are just that, and as soon as you establish contact,
> > move off of the calling frequency (where*EVER* you can find a clear spot)
> > and move your conversation (phone)/QSO (CW) there.  (CW is allowed
> > everywhere still, right? ;-))
> >
> > So, if I call CQ on 3.885, and there's an AM conversation on 3.880 and
> another
> > on 3.890, I'm gonna go hunt up/down and find a hole somewhere else that
> > this station and I can mutually work, together.  I, being the Extra, would
> ask
> > the other party where he'd be comfortable at.  3.870?  3.875?  3.753.45?
> >  I -have-
> > a VFO, so it don't matter.
> >
> > Speaking of which... Not Having a VFO is no excuse, either.  If you've a
> > crystal, you can feed a vfo signal in that same socket.  Even if it's only
> a
> > low-
> > level output from a ricebox, you can feed a small amount of RF in there,
> to
> > make that old rig frequency agile.
> >
> > I conlude that the general concession is that a lot of the "local
> discussions"
> > on
> > 75m is, well.. let's just say it's not fit for mixed company.  Not that
> I'm a
> > prude,
> > but I also get that more gentlemen operate AM than there are Gentlemen on
> > most SSB frequencies.  Being polite Gentlemen, and not being diliberate,
> why
> > -not- fire up AM QSO's, starting at 3.753 (if the frequency is clear) and
> having
> > a pair of guys every 6kc (when possible) and fill the whole cotton pickin'
> band
> > with AM.  THEN, when the Sidebanders whine and complain about ALL the
> > AM, we -could- say "Fine.  We'll confine ourselves to these 30kc *if* you
> > keep your SSB QSO's off of say between 3.860 to 3.890."  But, then that
> puts
> > us back in a "window" or a box, if you will.  No.. upon further
> reflection, I
> > believe that operating an AM rig anywhere you're allowed phone operation
> > is what the answer is.  Being limited to 3.870/75/80/85 and 90 on 75m
> is -not-
> > conducive to further growth of our little spectrum of the hobby.
> >
> > If we want to 'raise the level of politeness' on 75m, then let's get
> AM'ers on
> > the band, starting from 3.753, and getting a qso going every 6kc up the
> band.
> >
> > Getting everyone on, at the same time, is a logistical nightmare, but
> a -lot- of
> > people have a -lot- more free-time during the holiday season.
> >
> > Any suggestions as to when this should happen?
> >
> > 73 = Best Regards,
> > -Geoff/W5OMR
> >
> >
> > __
> > AMRadio mailing list
> > Home: http://mailman.qth.net/mailman/lis

Re: [AMRadio] The AM Window

[Geoff/W5OMR]

> The reasons, as
> mentioned earlier, antenna is cut for 3885, have no VFO, have only 1
> crystal, SSB'ers will get mad at me, transmitter is only tuned for 3885,
> etc., etc. always seem to be the answers.

Then those aren't what we call "real hams".  I don't think I know of an
AM Radio Operator that would be caught *dead* running a store-bought
dipole antenna.  Them folks are no more than an appliance operator.

I can't fathom anyone giving credence to an argument of "my dipole is 
only cut for 3.885", and no AM'er worth his salt, CARES whether or not
the SSB'ers are mad at him!  TRANSMITTER is only tuned for 3885?

C'mon, Pete... yer making my teeth itch! ;-)
 
> Anyway, this past Sunday, listening on 75 in the late afternoon, at one
> point there were AM QSO's on 3810, 3825, 3837(AWA net meets around here),
> 3852, 3860, 3875, and 3885. Most weekends, at least here in the
> Northeast, a number of AM'ers have at least found the VFO knob, and have
> moved to other parts of the band. I'm willing to bet, at least here in
> the Northeast/middle Atlantic area,  there will more of this type
> spreading out throughout the holiday week.

And, that's a GOOD thing! :-)

Merry CHRISTmas!

73 = Best Regards,
-Geoff/W5OMR

[AMRadio] AM space

[StephenTetorka]

Hello All:

It is my observation that there is a goodly amount of 'open' space from 14.3 to 
14.35 MHz. most of the time.

Conditions are not favorable as 75...but having ample 'elbow room' sure feels 
good.

Would it be worthwhile to consider an AM gathering location there?

PS: anyone familiar with Rothman AM modulation? 

Happy Holidays,
Steve 
WA2TAK

Re: [AMRadio] The AM Window

[Donald Chester]

Then those aren't what we call "real hams".  I don't think I know of an
AM Radio Operator that would be caught *dead* running a store-bought
dipole antenna.  Them folks are no more than an appliance operator.


I get a chuckle when someone tells me they are using a "homebrew dipole".  I 
assume, by default, that when someone puts up a dipole, it is homebrew, 
especially within the AM community.

[AMRadio] Rothman Modulation

[Geoff/W5OMR]

This is a new term, for me.  So, a Googling I went.

Not much information on Rothman Modulation, but there was some.
Perhaps someone else on here can add to this?

73 = Best Regards,
-Geoff/W5OMR

--
Article: 101889 of rec.radio.amateur.boatanchors
From: Edward Knobloch <[EMAIL PROTECTED]>
Subject: Re: Info needed on "Taylor Modulation" from the 50's.
References: <[EMAIL PROTECTED]>
Message-ID: <[EMAIL PROTECTED]>
Date: Fri, 22 Oct 2004 17:06:49 GMT

Mike Baker <[EMAIL PROTECTED]> wrote:
> Hello to all.
> When I was a kid I recall reading something in an old CQ/73/QST
> magazine about a modulation method for AM called Tayor Modulation.  It
> was sort of a precursor to controlled carrier and used a seperate
> modulator tube hooked up sort of in parallel to the final amp and
> usually was the same tube type.  There was no modulation transformer
> like in typical class B High level modulation schemes.


Hi, Mike

You are thinking of "Rothman Modulation" April 1952 CQ.
(Which I can't find).  If I recall correctly, controlled
carrier screen voltage for the finals was derived from the rf output
carrier power.  I remember a picture of an outboard box with a couple
of 6Y6 style tubes (perhaps it was a single 6Y6 and a rectifier tube),
modulating a pair of 813's.

73,
Ed Knobloch
---

and the reply was...

---

Article: 101890 of rec.radio.amateur.boatanchors
From: "COLIN LAMB" <[EMAIL PROTECTED]>
References: <[EMAIL PROTECTED]>
<[EMAIL PROTECTED]>
Subject: Re: Info needed on "Taylor Modulation" from the 50's.
Message-ID: <[EMAIL PROTECTED]>
Date: Fri, 22 Oct 2004 18:05:19 GMT

Hello Ed:

My wife says I have so much crap I could not possibly find anything - but I
walked right to the shelf where the April 1952 CQ magazine was.

You are therefore batting 1 for 3, since you got it right on the outboard
chassis, but wrong on the 6Y6 style tube.  However, when you get to be our
age and have forgotten more circuits than the younger hams have ever read
about, that is not that bad.

Anyway, there were two different circuits shown.  A 100 watt mobile
modulator using a 6X4 rf rectifier with a 6SN7 modulator tube, and a fixed
station modulator for up to 1000 watts uisng an 80 rf rectifier, a 6SL7
speech amp and a 6CD6 modulator tube.  Since the 6CD6 tube has a plate cap,
it does not look like a 6Y6.  The 6BQ6 and 6BG6 can also be used.

I have a number of 6CD6 and 6BG6 tubes and never could figure out what to do
with them.  This is the answer.  Build dozens of Rothman modulators.

I think later that year and into 1953, you could buy an "efficiency
Modulator" using this system.  They claimed 70% efficiency, which was much
better than the 52% efficiency of high level plate modulation.

And my wife thinks I cannot find things.  Ha.

73,  Colin  K7FM
-

RE: [AMRadio] AM space

[Donald Chester]

There is already an AM group on approx 14.286.  I haven't run 20m AM since 
the early 70's.  It is OK for one-on-one contacts, but when roundtables 
develop, there is the problem of the erormous skip zone on 20.  You can 
count on one or more members of the roundtable being inaudible, so you spend 
much of the QSO listening to noise and random QRM.


Maybe the top end of the band would be appropriate for contacts understood 
to be 1-on-1, or at least that it is poor operating practice to break in on 
a QSO unless you are certain that you are hearing everyone satisfactorily.  
A group with 3 mutually audible members is not unusual, but once the group 
builds up to 4 or more, you can nearly always expect someone in the group 
not to be hearing someone else.


The lack of activity on 20m is an indicator that overall amateur activity is 
dwindling.  Years ago, whenever the band was open, the phone band was packed 
end to end.


Even 75m in the evening in wintertime during prime time operating hours has 
many more vacant holes than you used to be able to expect...  why not use 
these as opportunities to start up on AM outside the "window"?


We may have lost the top end of 75, 3990-4000 to Radio Deutche-Welle's 
Digital Radio Mondiale (DRM) digital broadcasting mode.  There is also one 
of these on opprox 7260.  They take up a solid swath of 10 kHz with S9 + 20 
dB white noise.  Wait till more broadcasters on 40 switch to this mode.


-k4kyv

Re: [AMRadio] The AM Window

[Geoff/W5OMR]

> >Then those aren't what we call "real hams".  I don't think I know of an
> >AM Radio Operator that would be caught *dead* running a store-bought
> >dipole antenna.  Them folks are no more than an appliance operator.
> 
> I get a chuckle when someone tells me they are using a "homebrew dipole".  I 
> assume, by default, that when someone puts up a dipole, it is homebrew, 
> especially within the AM community.

There used to be arguments disguised as "intelligent debates" when someone
said "Rig here is homebrew", and someone would say "Did you blow the glass
in those tubes, yourself?  Wind your own transformers?  Roll your own Caps?"

Where does it end?  Sure, there's a point when you say "homebrew".  But, 
even classic car builders/restorers don't forge their own metal, for goodness
sake!

Grab a couple of tubes, mount the sockets, place the plate tuning cap on a 
chassis... "build" from parts laying around.  That is my idea of 'homebrew'.

73 = Best Regards,
-Geoff/W5OMR

Re: [AMRadio] Rothman Modulation

[Bob Bruhns]

I saw some stuff too... if I understood, Rothman and others are
experimenting with FM on a room-temperature laser to get precise
spectrographic readings from low-cost gear.  Kind of scientific ham stuff.

  Bacon, WA3WDR


- Original Message - 
From: "Geoff/W5OMR" <[EMAIL PROTECTED]>
To: 
Sent: Wednesday, December 22, 2004 10:24 AM
Subject: [AMRadio] Rothman Modulation


> This is a new term, for me.  So, a Googling I went.
>
> Not much information on Rothman Modulation, but there was some.
> Perhaps someone else on here can add to this?
>
> 73 = Best Regards,
> -Geoff/W5OMR
>
> --
> Article: 101889 of rec.radio.amateur.boatanchors
> From: Edward Knobloch <[EMAIL PROTECTED]>
> Subject: Re: Info needed on "Taylor Modulation" from the 50's.
> References: <[EMAIL PROTECTED]>
> Message-ID: <[EMAIL PROTECTED]>
> Date: Fri, 22 Oct 2004 17:06:49 GMT
>
> Mike Baker <[EMAIL PROTECTED]> wrote:
> > Hello to all.
> > When I was a kid I recall reading something in an old CQ/73/QST
> > magazine about a modulation method for AM called Tayor Modulation.  It
> > was sort of a precursor to controlled carrier and used a seperate
> > modulator tube hooked up sort of in parallel to the final amp and
> > usually was the same tube type.  There was no modulation transformer
> > like in typical class B High level modulation schemes.
> 
>
> Hi, Mike
>
> You are thinking of "Rothman Modulation" April 1952 CQ.
> (Which I can't find).  If I recall correctly, controlled
> carrier screen voltage for the finals was derived from the rf output
> carrier power.  I remember a picture of an outboard box with a couple
> of 6Y6 style tubes (perhaps it was a single 6Y6 and a rectifier tube),
> modulating a pair of 813's.
>
> 73,
> Ed Knobloch
> ---
>
> and the reply was...
>
> ---
>
> Article: 101890 of rec.radio.amateur.boatanchors
> From: "COLIN LAMB" <[EMAIL PROTECTED]>
> References: <[EMAIL PROTECTED]>
> <[EMAIL PROTECTED]>
> Subject: Re: Info needed on "Taylor Modulation" from the 50's.
> Message-ID: <[EMAIL PROTECTED]>
> Date: Fri, 22 Oct 2004 18:05:19 GMT
>
> Hello Ed:
>
> My wife says I have so much crap I could not possibly find anything - but
I
> walked right to the shelf where the April 1952 CQ magazine was.
>
> You are therefore batting 1 for 3, since you got it right on the outboard
> chassis, but wrong on the 6Y6 style tube.  However, when you get to be our
> age and have forgotten more circuits than the younger hams have ever read
> about, that is not that bad.
>
> Anyway, there were two different circuits shown.  A 100 watt mobile
> modulator using a 6X4 rf rectifier with a 6SN7 modulator tube, and a fixed
> station modulator for up to 1000 watts uisng an 80 rf rectifier, a 6SL7
> speech amp and a 6CD6 modulator tube.  Since the 6CD6 tube has a plate
cap,
> it does not look like a 6Y6.  The 6BQ6 and 6BG6 can also be used.
>
> I have a number of 6CD6 and 6BG6 tubes and never could figure out what to
do
> with them.  This is the answer.  Build dozens of Rothman modulators.
>
> I think later that year and into 1953, you could buy an "efficiency
> Modulator" using this system.  They claimed 70% efficiency, which was much
> better than the 52% efficiency of high level plate modulation.
>
> And my wife thinks I cannot find things.  Ha.
>
> 73,  Colin  K7FM
> -
>
>
> __
> 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] Rothman Modulation

[David Knepper]

Wasn't there a commercial modulator using the "Rothman" circuit some years
ago.  I remember seeing it somewhere in a catalog.


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: "Geoff/W5OMR" <[EMAIL PROTECTED]>
To: 
Sent: Wednesday, December 22, 2004 11:24 AM
Subject: [AMRadio] Rothman Modulation


> This is a new term, for me.  So, a Googling I went.
>
> Not much information on Rothman Modulation, but there was some.
> Perhaps someone else on here can add to this?
>
> 73 = Best Regards,
> -Geoff/W5OMR
>
> --
> Article: 101889 of rec.radio.amateur.boatanchors
> From: Edward Knobloch <[EMAIL PROTECTED]>
> Subject: Re: Info needed on "Taylor Modulation" from the 50's.
> References: <[EMAIL PROTECTED]>
> Message-ID: <[EMAIL PROTECTED]>
> Date: Fri, 22 Oct 2004 17:06:49 GMT
>
> Mike Baker <[EMAIL PROTECTED]> wrote:
> > Hello to all.
> > When I was a kid I recall reading something in an old CQ/73/QST
> > magazine about a modulation method for AM called Tayor Modulation.  It
> > was sort of a precursor to controlled carrier and used a seperate
> > modulator tube hooked up sort of in parallel to the final amp and
> > usually was the same tube type.  There was no modulation transformer
> > like in typical class B High level modulation schemes.
> 
>
> Hi, Mike
>
> You are thinking of "Rothman Modulation" April 1952 CQ.
> (Which I can't find).  If I recall correctly, controlled
> carrier screen voltage for the finals was derived from the rf output
> carrier power.  I remember a picture of an outboard box with a couple
> of 6Y6 style tubes (perhaps it was a single 6Y6 and a rectifier tube),
> modulating a pair of 813's.
>
> 73,
> Ed Knobloch
> ---
>
> and the reply was...
>
> ---
>
> Article: 101890 of rec.radio.amateur.boatanchors
> From: "COLIN LAMB" <[EMAIL PROTECTED]>
> References: <[EMAIL PROTECTED]>
> <[EMAIL PROTECTED]>
> Subject: Re: Info needed on "Taylor Modulation" from the 50's.
> Message-ID: <[EMAIL PROTECTED]>
> Date: Fri, 22 Oct 2004 18:05:19 GMT
>
> Hello Ed:
>
> My wife says I have so much crap I could not possibly find anything - but
I
> walked right to the shelf where the April 1952 CQ magazine was.
>
> You are therefore batting 1 for 3, since you got it right on the outboard
> chassis, but wrong on the 6Y6 style tube.  However, when you get to be our
> age and have forgotten more circuits than the younger hams have ever read
> about, that is not that bad.
>
> Anyway, there were two different circuits shown.  A 100 watt mobile
> modulator using a 6X4 rf rectifier with a 6SN7 modulator tube, and a fixed
> station modulator for up to 1000 watts uisng an 80 rf rectifier, a 6SL7
> speech amp and a 6CD6 modulator tube.  Since the 6CD6 tube has a plate
cap,
> it does not look like a 6Y6.  The 6BQ6 and 6BG6 can also be used.
>
> I have a number of 6CD6 and 6BG6 tubes and never could figure out what to
do
> with them.  This is the answer.  Build dozens of Rothman modulators.
>
> I think later that year and into 1953, you could buy an "efficiency
> Modulator" using this system.  They claimed 70% efficiency, which was much
> better than the 52% efficiency of high level plate modulation.
>
> And my wife thinks I cannot find things.  Ha.
>
> 73,  Colin  K7FM
> -
>
>
> __
> 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] AM

[Cory Hine]

Maybe, just maybe we are all too excited about this am
thing. Or maybe I'm just a casual operator, but when I
get on in the late afternoon, things are ususally
pretty quiet, and I can have a nice qso with someone.
If the band is noisy, I'll go do something else. If
there are ssb stations on, I will either talk on am or
go somewhere else. We are not guaranteed good
conditions. Big antennas and amps will help, but I
think we have to accept conditions as they are, just
like the weather. Improve the station, put out a
better signal, and enjoy whatever comes your way.
Innovate, adapt, overcome, succeed.

Cory/AD5QP

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Re: [AMRadio] The AM Window

[peter A Markavage]

Quote - "Then those aren't what we call "real hams".  I don't think I
know of an AM Radio Operator that would be caught *dead* running a
store-bought dipole antenna.  Them folks are no more than an appliance
operator."

In today's world of amateur radio, what does the phrase "real hams"
really mean? If, you're comparing hams of today with hams of 40 or 50
years ago, there are major differences in their outlook and perception of
what ham radio is to them. It doesn't make them less of a "real ham"
because they choose to use a modern appliance-type radio. They're
interested in operating and using the mode and probably have less
interest in what generates it. Up in the Northeast there are a number of
hams who currently use modern (Icom, Kenwood, Yaesu) radios as their main
source of AM operating.  Some of these guys have been on AM as short 2
years, whereas others have been active for over 40 years. Many AM'ers are
now choosing the ease, flexibility, and overall superiority of a modern
rig versus the constant smell and diddling of a 50 year or older radio.
Doesn't make them less of a "real ham". As far as store-bought antennas,
AM amateurs with restricted space, yards with one tree 5 foot tall,
apartments, condos, etc. sometimes have to resort to commercially made
short or trap type antennas in order to get on the air at all. Appliance
operator doesn't fit here either.

Heck, I run AM most of the time either with a Icom 756 PRO II, Kenwood
Twins, C.E. 100V, Apache, and, on rare occasions, several Johnson rigs.
The smell and diddle has started to waned for me. It just doesn't drive
my interest as much today.

Pete, wa2cwa

On Wed, 22 Dec 2004 06:44:29 -0600 "Geoff/W5OMR"
<[EMAIL PROTECTED]> writes:
> 
> > The reasons, as
> > mentioned earlier, antenna is cut for 3885, have no VFO, have only 
> 1
> > crystal, SSB'ers will get mad at me, transmitter is only tuned for 
> 3885,
> > etc., etc. always seem to be the answers.
> 
> Then those aren't what we call "real hams".  I don't think I know of 
> an
> AM Radio Operator that would be caught *dead* running a 
> store-bought
> dipole antenna.  Them folks are no more than an appliance operator.
> 
> I can't fathom anyone giving credence to an argument of "my dipole 
> is 
> only cut for 3.885", and no AM'er worth his salt, CARES whether or 
> not
> the SSB'ers are mad at him!  TRANSMITTER is only tuned for 3885?
> 
> C'mon, Pete... yer making my teeth itch! ;-)
>  
> > Anyway, this past Sunday, listening on 75 in the late afternoon, 
> at one
> > point there were AM QSO's on 3810, 3825, 3837(AWA net meets around 
> here),
> > 3852, 3860, 3875, and 3885. Most weekends, at least here in the
> > Northeast, a number of AM'ers have at least found the VFO knob, 
> and have
> > moved to other parts of the band. I'm willing to bet, at least 
> here in
> > the Northeast/middle Atlantic area,  there will more of this type
> > spreading out throughout the holiday week.
> 
> And, that's a GOOD thing! :-)
> 
> Merry CHRISTmas!
> 
> 73 = Best Regards,
> -Geoff/W5OMR

[AMRadio] AM Opns

[Rbethman]

Seems like a hornet's nest has been stirred up, and I am ONE of those 
that stirred it up.


I won't apologize.

First - I stay away from 75mtrs like the plague.  Too many "lids" whom 
are obviously running WAY too much RF out for "their" local NE area 
"group"!  THEY won't even recognize anyone outside THEIR clique.


Second - the group on 40mtrs that runs in the mornings, always pauses 
after transmitting, to listen for ANY new callers.  Typically "we" start 
from 7283 and go up as needed.


If too many groups are running close, I, and some of the others, will 
sometimes slip our R-390As and/or SP-600 RXs to sideband/CW mode and 
pick up ONE sideband to allow us to be able to listen.  That is sort of 
a RARE thing.


Most of the group are running either home-brew 813 X 813s, T-368s, 
4X250s, BC-610s, and other such rigs.  Mine are BC-610s.  VFO capability 
is VERY much there.


As to the antenna cut to ONE freq, there IS a range of +/- X kc where 
the VSWR is within limits of the TX.  I flip the coax sw to the ME-165 
dummy load, tune the osc to the new RX freq, then flip on plate to dip 
final.  THEN I flip the coax sw to the antenna, touching it up when it 
is my turn - on the fly.


So far "we" haven't had much trouble within the Mid-Atlantic, NE, SE, 
and the East Coast.


All of us try our VERY level best to NOT use more oomph than necessary.  
This can be a "bit" difficult with BC-610s, BUT it IS doable.


I just DON'T see any useful purpose in firing up where I KNOW the SSB 
and Ricebox folks run.  Why aggravate and agitate?


It is a "little" off from my retired military personality, BUT, I have 
no desire to fight and start wars.


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 |
|  SP-600/NR Type 159, Heath DX-60, Apache, Mohawk, SX-101, HT-32A |
+--+
|   Amateur Astronomer - Celestron Nexstar 8   |
| 12" f5 Dob coming soon!  Being built |
|  Meade ETX-60|
|   38 Deg 46'48.62"' N - 77 Deg 28'26.89" 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 System Works |
+--+

Re: [AMRadio] The AM Window

[Jim Wilhite]

You have given me an idea Don.  My next building project will be a home brew 
dipole.  What a great idea 


73  Jim
W5JO

- Original Message - 
From: "Donald Chester" <[EMAIL PROTECTED]>

To: 
Sent: Wednesday, December 22, 2004 9:12 AM
Subject: Re: [AMRadio] The AM Window





Then those aren't what we call "real hams".  I don't think I know of an
AM Radio Operator that would be caught *dead* running a store-bought
dipole antenna.  Them folks are no more than an appliance operator.


I get a chuckle when someone tells me they are using a "homebrew dipole". 
I assume, by default, that when someone puts up a dipole, it is homebrew, 
especially within the AM community.



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Re: [AMRadio] The AM Window

[Geoff/W5OMR]

> Quote - "Then those aren't what we call "real hams".  I don't think I
> know of an AM Radio Operator that would be caught *dead* running a
> store-bought dipole antenna.  Them folks are no more than an appliance
> operator."
 
> In today's world of amateur radio, what does the phrase "real hams"
> really mean? If, you're comparing hams of today with hams of 40 or 50
> years ago, there are major differences in their outlook and perception of
> what ham radio is to them. It doesn't make them less of a "real ham"
> because they choose to use a modern appliance-type radio. 

John Coleman, constant lurker and sometimes poster to this list, said it best.

I'm sure John wouldn't mind, if we were all to take a look at what he wrote,
about "What AM Means To Me", found at
http://www.amwindow.org/features/htm/wa5bxo.htm

73 = Best Regards,
-Geoff/W5OMR

[AMRadio] Off Topic: Nuts!

[Merz Donald S]

Helluva day... 60 years ago today, General McAuliffe was telling the Germans 
what they could do with their suggestion that he surrender Bastogne...and on 
this day 80 years prior to that, General Sherman was giving the city of 
Savannah to President Lincoln as a Christmas present. 

73, Don Merz, N3RHT
 
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] Off Topic: Nuts!

[ronnie.hull]

and in that same thread, I was looking at a 506PIR 101st A/B website today 
and saw a picture of a paratrooper in bastogne, that looked amazingly like 
the son of a good friend of mine. Imagine my surprise when I read the caption 
and discovered that indeed, it was his grandfather, my good friends Dad. This 
is true, I just discovered this not 15 minutes ago.

My own father jumped at Normandy with the 82nd, and in Holland where he was 
wounded out of the airborne, and fought at Bastogne with the 30th Inf? I have 
to look that part back up. But he was there.

73's and Merry Christmas y'all

Ronnie



-- Original Message ---
From: "Merz Donald S" <[EMAIL PROTECTED]>
To: "'Amradio (E-mail)" , "'Glowbugs (E-mail)" 
<[EMAIL PROTECTED]>
Sent: Wed, 22 Dec 2004 13:25:12 -0500
Subject: [AMRadio] Off Topic: Nuts!

> Helluva day... 60 years ago today, General McAuliffe was telling the 
> Germans what they could do with their suggestion that he surrender 
> Bastogne...and on this day 80 years prior to that, General Sherman 
> was giving the city of Savannah to President Lincoln as a Christmas 
> present. 
> 
> 73, Don Merz, N3RHT
>  
> 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) 
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--- End of Original Message ---

Re: [AMRadio] Heavy Metal Rally

[Todd, KA1KAQ]

Geoff - 

This year's Rally is next year, second week of January as I recall.
Ray said that some people complained about it being too close to the
holiday. I'd tend to agree, if it were on Christmas eve and not
Christmas night and the following day. Hopefully no one will tell the
CW folks that SK night is on New Years Eve. s!

IIRC, operation on 75 was allowed last year. I missed the first
couple, so I can't say if it always was. Big change this year (other
than the date) includes allowing solid state gear, provided it runs a
big amp w/tubes after it. No idea why beyond the 'all-inclusive'
nature of today's world. I always thought that anyone could
participate, only 'heavy metal' stations were eligible to win,
however.

Word has it that some of the tall ships will be getting together on
Christmas night/weekend as usual for an informal gathering in the
spirit of Bill's original idea. I have one of the big rigs pecolating
again here, just need to get my 'homebrew dipole' back up in the air.

Seems like the holiday week is a great time to get on the air and
enjoy some good radio fun. Listening in to last year's Rally really
got me going to get a big station back on the air. Need to finish up
the BC project for 160 (I've advanced to reparing the area of the mod
reactor meltdown), but at least I have one rig ready to go. Of course,
I still need to roll it out into the kitchen and move the electric
range to plug it in, but us single guys can get away with that. The YL
likes the 'nice old radios', though. (-:

73 de Todd/'Boomer'  KA1KAQ


On Tue, 21 Dec 2004 15:45:52 -0600, Geoff/W5OMR <[EMAIL PROTECTED]> wrote:
> Has anyone given a specific time/date for this years "Heavy Metal Rally"?
> 
> Is it only on 160m, or has it now expanded to 75m?
> 
> 73 = Best Regards,
> -Geoff/W5OMR

Re: [AMRadio] Rothman Modulation

[Mark Foltarz]

Yup,  I own one NOS.  Manual is of course on BAMA.

de KA4JVY
Mark


--- David Knepper <[EMAIL PROTECTED]> wrote:

> Wasn't there a commercial modulator using the "Rothman" circuit some years
> ago.  I remember seeing it somewhere in a catalog.
> 
> 
> 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: "Geoff/W5OMR" <[EMAIL PROTECTED]>
> To: 
> Sent: Wednesday, December 22, 2004 11:24 AM
> Subject: [AMRadio] Rothman Modulation
> 
> 
> > This is a new term, for me.  So, a Googling I went.
> >
> > Not much information on Rothman Modulation, but there was some.
> > Perhaps someone else on here can add to this?
> >
> > 73 = Best Regards,
> > -Geoff/W5OMR
> >
> > --
> > Article: 101889 of rec.radio.amateur.boatanchors
> > From: Edward Knobloch <[EMAIL PROTECTED]>
> > Subject: Re: Info needed on "Taylor Modulation" from the 50's.
> > References: <[EMAIL PROTECTED]>
> > Message-ID: <[EMAIL PROTECTED]>
> > Date: Fri, 22 Oct 2004 17:06:49 GMT
> >
> > Mike Baker <[EMAIL PROTECTED]> wrote:
> > > Hello to all.
> > > When I was a kid I recall reading something in an old CQ/73/QST
> > > magazine about a modulation method for AM called Tayor Modulation.  It
> > > was sort of a precursor to controlled carrier and used a seperate
> > > modulator tube hooked up sort of in parallel to the final amp and
> > > usually was the same tube type.  There was no modulation transformer
> > > like in typical class B High level modulation schemes.
> > 
> >
> > Hi, Mike
> >
> > You are thinking of "Rothman Modulation" April 1952 CQ.
> > (Which I can't find).  If I recall correctly, controlled
> > carrier screen voltage for the finals was derived from the rf output
> > carrier power.  I remember a picture of an outboard box with a couple
> > of 6Y6 style tubes (perhaps it was a single 6Y6 and a rectifier tube),
> > modulating a pair of 813's.
> >
> > 73,
> > Ed Knobloch
> > ---
> >
> > and the reply was...
> >
> > ---
> >
> > Article: 101890 of rec.radio.amateur.boatanchors
> > From: "COLIN LAMB" <[EMAIL PROTECTED]>
> > References: <[EMAIL PROTECTED]>
> > <[EMAIL PROTECTED]>
> > Subject: Re: Info needed on "Taylor Modulation" from the 50's.
> > Message-ID: <[EMAIL PROTECTED]>
> > Date: Fri, 22 Oct 2004 18:05:19 GMT
> >
> > Hello Ed:
> >
> > My wife says I have so much crap I could not possibly find anything - but
> I
> > walked right to the shelf where the April 1952 CQ magazine was.
> >
> > You are therefore batting 1 for 3, since you got it right on the outboard
> > chassis, but wrong on the 6Y6 style tube.  However, when you get to be our
> > age and have forgotten more circuits than the younger hams have ever read
> > about, that is not that bad.
> >
> > Anyway, there were two different circuits shown.  A 100 watt mobile
> > modulator using a 6X4 rf rectifier with a 6SN7 modulator tube, and a fixed
> > station modulator for up to 1000 watts uisng an 80 rf rectifier, a 6SL7
> > speech amp and a 6CD6 modulator tube.  Since the 6CD6 tube has a plate
> cap,
> > it does not look like a 6Y6.  The 6BQ6 and 6BG6 can also be used.
> >
> > I have a number of 6CD6 and 6BG6 tubes and never could figure out what to
> do
> > with them.  This is the answer.  Build dozens of Rothman modulators.
> >
> > I think later that year and into 1953, you could buy an "efficiency
> > Modulator" using this system.  They claimed 70% efficiency, which was much
> > better than the 52% efficiency of high level plate modulation.
> >
> > And my wife thinks I cannot find things.  Ha.
> >
> > 73,  Colin  K7FM
> > -
> >
> >
> > __
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> 




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[AMRadio] BAMA Files

[Bob Maser]

What do I need to do to be able to print manuals on the BAMA website?  Do I 
need Netscape?
Also, I am looking for a 575A HV Rectifier or the solid state plug-in 
diodes.  Anyone have some to sell?
I am in the process of converting a Collins 20V-3 for 75M.  I was reading 
some of the "AM Window" discussions with a chuckle.  Don't you realize that 
the biggest signal gets the frequency regardless of emission type.  If a SSB 
station jumps on to an AM QSO, just turn off the AM rig and reach over and 
turn on that big linear and tell them to move.  It doesn't do any good to 
argue with them on AM cuz they probably don't know how to switch their rice 
box to that mode.  I'll give y'all a demo one of these evenings.



Bob W6TR 

Re: [AMRadio] BAMA Files

[Jim Wilhite]

What do I need to do to be able to print manuals on the BAMA website?  Do 
I need Netscape?




Bob:  You do not mention which type of file you have downloaded.  There are 
file types GIF, DjVu, PDF and others.  Also you didn't mention if you 
downloaded from BAMA itself or the mirror site.


Check the extension and if it is djvu, then download the plugin for Explorer 
and it should come right up and you can print from that.  If it is pdf then 
Adobe Reader should print from the Adobe bar, not the Explorer bar.


73  Jim
W5JO 

[AMRadio] AM Window on 15 Meters?

[Mike Duke, K5XU]

As 10 meters began its decline a few years ago, I would often ask AM 
operators if they ever used 15 meters. With very few exceptions, the answer 
would usually go something like: "No, because I never hear anyone else down 
there."

There was AM activity for a brief time around 21.400, and on 21.430. But, in 
casual tuning on the weekends, I have heard less than 5 AM stations on 15 
meters within the past year.

I say all that to ask just where is the "AM window" on 15 meters?

And, why don't more of us operate there?

Unless there's a contest, 15 meters is usually not crowded. Those of us who 
run rice boxes or similar power can usually hold our own there once a 
contact is established.


Mike Duke, K5XU
American Council of Blind Radio Amateurs 

Re: [AMRadio] AM Window on 15 Meters?

[Russmill47]

Mike, 
I'd give AM a try on 15 meters.
 
Maybe a sked?
 
73,
 
Russ
WA3FRP

Re: [AMRadio] The AM Window

[Vince Wesa Werber]

The transmitter is at One Long Point the same as his home.  The transmitters 
are in a run down old lodge behind his house.  Nothing special.

Yo might find it interesting that Belgrade Lakes is the mythical "On Golden 
Pond' from the movie...  Now I will tell you why the 'pond' is 'golden'...

This 'high class' place (so called) is the location of the largest 'Septage 
Utilization Site' in the state of Maine.  What is a 'Septage Utilization 
site'; you ask???  A farm when raw human feces is spread to grow hay and or 
vegetables.

Over one million gallons of raw septic tank (and BFI sludge) is spread here 
per year.  The 'pond' is so polluted that even one swim for many folks will 
bring on a bad case of 'swimmers itch'...  they blame it on the Ducks pooping 
in the water...

 

So let's face facts...  if any one of us were to drink the water from that 
place we all would be babbling idiots like Mr. Baxter...

BTW I'm the Ham that Mr. Baxter (K1MAN) said that Walter Cronkite 'hang out to 
dry'...  NOT TRUE!!!  For that to happen Mr. Cronkite would have to know me 
in one way or the other, facts are facts,  Mr. Cronkite doesn't know me from 
Adam!

Also, I was taken to court by Mr. Baxter...  I was award this case by 
default...  Mr. Baxter did not want to face me in court...  And for those 
that don't know, Mr. Baxter ALWAYS acts as his own attorney...  he has a fool 
for a client don't you think and an idiot for an attorney!

In one of Mr Baxter's spam editorials he refers to himself as having some sort 
of mental illness...  to the best of my knowledge this is NOT a fact...  
there has been no hearing at any court or order of insanity handed down by 
any judge as of yet...

Thanks for the rant guys... I'm done...
73
vince
ka1iic


On Tuesday 21 December 2004 03:21 pm, Schichler, Don wrote:
> The transmitter is in Belgrade Lakes, Maine.  It appears to be operated by
> remote control from an undisclosed location.
>
> 73, Don K2FY
>

Re: [AMRadio] The AM Window

[Vince Wesa Werber]

and go here to see what he might do in his spare time (no I'm not sure)

http://k1man.itishot.us/

Don't go there with children around ok???  It's the 'Home Sex Network'
73
vince
ka1iic



On Tuesday 21 December 2004 03:18 pm, peter A Markavage wrote:
> Go here for a view of the area in Maine:
> http://www.k1man.com/web16/Page_30x.html
> or go here and poke around, http://www.k1man.com/web16/Page_1x.html
>
> Pete, wa2cwa
>
> On Tue, 21 Dec 2004 14:36:28 -0500 "Chris K." <[EMAIL PROTECTED]> writes:
> > Does anyone know where K1MAN is really broadcasting from?
> > Transmitter site and studio site.  What does he use for equipment
> > and
> > antenna?
> > Thanks,  73, Chris VE3NGW/W4 Florida
>
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Re: [AMRadio] Antenna Tuner Wonderings

[Donald Chester]

What kind of "crappy" antennas are you using, i.e., doublets fed with coax,
open wire lines, etc., or end-fed wires?   Or, some combination of types 
maybe?



Rather that building up a bunch of tuners you might consider putting your
efforts into erecting a set of antennas that all worked directly off a 50 
or 75
ohm coax feedlines.   Half-wave dipoles, one for each band, for example, or 
one

or more of the multi-band arrangements (G5RV, fan and trap dipole, etc.).


I think the best solution would be to erect one good dipole, as high as you 
can get it, for the lowest frequency band you operate.  If you don't have 
that much space, consider a  shortened dipole for the lowest band.  Feed it 
with open wire  line and a balanced tuner (not one of those bogus jobs with 
unbalanced T or L network coupled to the balanced line via a balun).  I 
prefer to make my multi-band tuners using plug in coils and split stator air 
variables.  You should be able to transform the driving impedance of that 
antenna to 50 ohms nonreactive on about any amateur frequency, without a 
forest of separate dipoles growing out of the shack.  Then couple whichever 
transmitter you are using to the tuner.


At present I use a system a little more complicated.  I still use one dipole 
for all bands, but a separate tuner for each band.  That way the tuner is 
pre-tuned to frequency and all I have to do is load the appropriate 
transmitter into it and switch the feedline to it.


The dipole is cut for 80m, but I can load it up on 160 as a quarterwave 
dipole with fairly good results.  It is about 110 ft. high, so the height 
somewhat compensates for the shortness of it on 160.


I use a separate L-network to match the the quarterwave base-insulated 
vertical on 160, which is  my main topband antenna.


73, Don K4KYV

[AMRadio] Re: [Amps] Marconi AM Transmitter

[Patrick Jankowiak]

Don't tear it up!

Maybe someone on the MIL list might want to collect it. I posted 
it over there. Please don't part it out if it's complete..


- Original Message -
From: Roger Parsons <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, December 20, 2004 5:44 AM
Subject: [Amps] Marconi AM Transmitter


>> A friend of mine (VE3AC) has an old (1952) Marconi
>> 500W AM transmitter, which is ex Canadian military and
>> covers 1.5-15MHz. It uses a pair of 4-125s in both PA
>> and modulator. It is very nice, but also very heavy!
>>
>> Does anybody know if this is worth anything, or
>> collectable, or would he be best to take it apart and
>> sell the tubes/vacuum variable/transformers etc?
>>
>> Thanks
>> 73 Roger
>> VE3ZI

Re: [AMRadio] Rothman Modulation

[W7QHO]

In a message dated 12/22/04 12:50:52 PM, [EMAIL PROTECTED] writes:


> Yup,  I own one NOS.  Manual is of course on BAMA.
> 

Under what name?

Dennis D. W7QHO
Glendale, CA

[AMRadio] Rothman Modulation

[Patrick Jankowiak]

I would like to know more, here's all I ever found.

--

From: [EMAIL PROTECTED]
Subject: [AMRadio] AM space


Hello All:

It is my observation that there is a goodly amount of 'open' 
space from 14.3 to 14.35 MHz. most of the time.


Conditions are not favorable as 75...but having ample 'elbow 
room' sure feels good.


Would it be worthwhile to consider an AM gathering location there?

PS: anyone familiar with Rothman AM modulation?

Happy Holidays,
Steve
WA2TAK



Mike Baker <[EMAIL PROTECTED]> wrote:
Hello to all.
When I was a kid I recall reading something in an old CQ/73/QST
magazine about a modulation method for AM called Tayor 
Modulation.  It was sort of a precursor to controlled carrier and 
used a seperate modulator tube hooked up sort of in parallel to 
the final amp and usually was the same tube type.  There was no 
modulation transformer like in typical class B High level 
modulation schemes.



Hi, Mike

You are thinking of "Rothman Modulation" April 1952 CQ.
(Which I can't find).  If I recall correctly, controlled
carrier screen voltage for the finals was derived from the rf 
output carrier power.  I remember a picture of an outboard box 
with a couple of 6Y6 style tubes (perhaps it was a single 6Y6 and 
a rectifier tube), modulating a pair of 813's.


73,
Ed Knobloch

Article: 101890 of rec.radio.amateur.boatanchors
From: "COLIN LAMB" <[EMAIL PROTECTED]>
References: <[EMAIL PROTECTED]> 
<[EMAIL PROTECTED]>

Subject: Re: Info needed on "Taylor Modulation" from the 50's.
Message-ID: <[EMAIL PROTECTED]>
Date: Fri, 22 Oct 2004 18:05:19 GMT

Hello Ed:

My wife says I have so much crap I could not possibly find 
anything - but I walked right to the shelf where the April 1952 
CQ magazine was.


You are therefore batting 1 for 3, since you got it right on the 
outboard chassis, but wrong on the 6Y6 style tube.  However, when 
you get to be our age and have forgotten more circuits than the 
younger hams have ever read about, that is not that bad.


Anyway, there were two different circuits shown.  A 100 watt 
mobile modulator using a 6X4 rf rectifier with a 6SN7 modulator 
tube, and a fixed station modulator for up to 1000 watts uisng an 
80 rf rectifier, a 6SL7 speech amp and a 6CD6 modulator tube. 
Since the 6CD6 tube has a plate cap, it does not look like a 6Y6. 
 The 6BQ6 and 6BG6 can also be used.


I have a number of 6CD6 and 6BG6 tubes and never could figure out 
what to do with them.  This is the answer.  Build dozens of 
Rothman modulators.


I think later that year and into 1953, you could buy an 
"efficiency Modulator" using this system.  They claimed 70% 
efficiency, which was much better than the 52% efficiency of high 
level plate modulation.


And my wife thinks I cannot find things.  Ha.

73,  Colin  K7FM

--

[AMRadio] Thank You to everyone

[w6om]

As the year draws to a close I want to say thanks to many of you who assisted 
me with several restoration projects during the year.  Your support, schematics 
and suggestions for improvement along with on the air tests once again affirmed 
the strong bond of friendship between Ham's and those of us who love old rigs 
and AM.

Happy Holidays to all from W6OM 

Ron Weaver - W6OM

[AMRadio] Hamvention 2005

[peter A Markavage]

Has anyone, who was a outside vendor this past year (2004), received a
packet of info to reserve your same spaces for the 2005 Hamvention. I
thought this stuff was suppose to be in our hands already. E-mail to the
flea market chairman has gone unanswered.

Pete, wa2cwa

Re: [AMRadio] AM Opns

[k0ng]

Hi Bob:  Nice reply. I like to work 7290 +/-, especially Sunday afternoon.
If we had 3 sidebands, I would listen there too.

73 DE Charlie, K0NG

PS, being ex Air Force, we naturally liked "flight before fight".

Quoting Rbethman <[EMAIL PROTECTED]>:

> Seems like a hornet's nest has been stirred up, and I am ONE of those 
> that stirred it up.
> 
> I won't apologize.
> 
> First - I stay away from 75mtrs like the plague.  Too many "lids" whom 
> are obviously running WAY too much RF out for "their" local NE area 
> "group"!  THEY won't even recognize anyone outside THEIR clique.
> 
> Second - the group on 40mtrs that runs in the mornings, always pauses 
> after transmitting, to listen for ANY new callers.  Typically "we" start 
> from 7283 and go up as needed.
> 
> If too many groups are running close, I, and some of the others, will 
> sometimes slip our R-390As and/or SP-600 RXs to sideband/CW mode and 
> pick up ONE sideband to allow us to be able to listen.  That is sort of 
> a RARE thing.
> 
> Most of the group are running either home-brew 813 X 813s, T-368s, 
> 4X250s, BC-610s, and other such rigs.  Mine are BC-610s.  VFO capability 
> is VERY much there.
> 
> As to the antenna cut to ONE freq, there IS a range of +/- X kc where 
> the VSWR is within limits of the TX.  I flip the coax sw to the ME-165 
> dummy load, tune the osc to the new RX freq, then flip on plate to dip 
> final.  THEN I flip the coax sw to the antenna, touching it up when it 
> is my turn - on the fly.
> 
> So far "we" haven't had much trouble within the Mid-Atlantic, NE, SE, 
> and the East Coast.
> 
> All of us try our VERY level best to NOT use more oomph than necessary.  
> This can be a "bit" difficult with BC-610s, BUT it IS doable.
> 
> I just DON'T see any useful purpose in firing up where I KNOW the SSB 
> and Ricebox folks run.  Why aggravate and agitate?
> 
> It is a "little" off from my retired military personality, BUT, I have 
> no desire to fight and start wars.
> 
> 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 |
> |  SP-600/NR Type 159, Heath DX-60, Apache, Mohawk, SX-101, HT-32A |
> +--+
> |   Amateur Astronomer - Celestron Nexstar 8   |
> | 12" f5 Dob coming soon!  Being built |
> |  Meade ETX-60|
> |   38 Deg 46'48.62"' N - 77 Deg 28'26.89" 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 System Works |
> +--+
> 
> 
> __
> 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] Rothman Modulation

[k0ng]

There was a Rothman circuit, worked well but I would not use it today.
The tube in the antenna lead could generate harmonics without a low pass
filter, at the band of operation.

Mike was correct, Taylor Modulation did and does exist, dont tell the
collectors but I modified an ARC-5 for Taylor. Uses one final, modulated
by a single 829B.Not currently on the air but available.

73 Charlie, K0NG

Quoting David Knepper <[EMAIL PROTECTED]>:

> Wasn't there a commercial modulator using the "Rothman" circuit some years
> ago.  I remember seeing it somewhere in a catalog.
> 
> 
> 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: "Geoff/W5OMR" <[EMAIL PROTECTED]>
> To: 
> Sent: Wednesday, December 22, 2004 11:24 AM
> Subject: [AMRadio] Rothman Modulation
> 
> 
> > This is a new term, for me.  So, a Googling I went.
> >
> > Not much information on Rothman Modulation, but there was some.
> > Perhaps someone else on here can add to this?
> >
> > 73 = Best Regards,
> > -Geoff/W5OMR
> >
> > --
> > Article: 101889 of rec.radio.amateur.boatanchors
> > From: Edward Knobloch <[EMAIL PROTECTED]>
> > Subject: Re: Info needed on "Taylor Modulation" from the 50's.
> > References: <[EMAIL PROTECTED]>
> > Message-ID: <[EMAIL PROTECTED]>
> > Date: Fri, 22 Oct 2004 17:06:49 GMT
> >
> > Mike Baker <[EMAIL PROTECTED]> wrote:
> > > Hello to all.
> > > When I was a kid I recall reading something in an old CQ/73/QST
> > > magazine about a modulation method for AM called Tayor Modulation.  It
> > > was sort of a precursor to controlled carrier and used a seperate
> > > modulator tube hooked up sort of in parallel to the final amp and
> > > usually was the same tube type.  There was no modulation transformer
> > > like in typical class B High level modulation schemes.
> > 
> >
> > Hi, Mike
> >
> > You are thinking of "Rothman Modulation" April 1952 CQ.
> > (Which I can't find).  If I recall correctly, controlled
> > carrier screen voltage for the finals was derived from the rf output
> > carrier power.  I remember a picture of an outboard box with a couple
> > of 6Y6 style tubes (perhaps it was a single 6Y6 and a rectifier tube),
> > modulating a pair of 813's.
> >
> > 73,
> > Ed Knobloch
> > ---
> >
> > and the reply was...
> >
> > ---
> >
> > Article: 101890 of rec.radio.amateur.boatanchors
> > From: "COLIN LAMB" <[EMAIL PROTECTED]>
> > References: <[EMAIL PROTECTED]>
> > <[EMAIL PROTECTED]>
> > Subject: Re: Info needed on "Taylor Modulation" from the 50's.
> > Message-ID: <[EMAIL PROTECTED]>
> > Date: Fri, 22 Oct 2004 18:05:19 GMT
> >
> > Hello Ed:
> >
> > My wife says I have so much crap I could not possibly find anything - but
> I
> > walked right to the shelf where the April 1952 CQ magazine was.
> >
> > You are therefore batting 1 for 3, since you got it right on the outboard
> > chassis, but wrong on the 6Y6 style tube.  However, when you get to be our
> > age and have forgotten more circuits than the younger hams have ever read
> > about, that is not that bad.
> >
> > Anyway, there were two different circuits shown.  A 100 watt mobile
> > modulator using a 6X4 rf rectifier with a 6SN7 modulator tube, and a fixed
> > station modulator for up to 1000 watts uisng an 80 rf rectifier, a 6SL7
> > speech amp and a 6CD6 modulator tube.  Since the 6CD6 tube has a plate
> cap,
> > it does not look like a 6Y6.  The 6BQ6 and 6BG6 can also be used.
> >
> > I have a number of 6CD6 and 6BG6 tubes and never could figure out what to
> do
> > with them.  This is the answer.  Build dozens of Rothman modulators.
> >
> > I think later that year and into 1953, you could buy an "efficiency
> > Modulator" using this system.  They claimed 70% efficiency, which was much
> > better than the 52% efficiency of high level plate modulation.
> >
> > And my wife thinks I cannot find things.  Ha.
> >
> > 73,  Colin  K7FM
> > -
> >
> >
> > __
> > 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] Lowest level modulation

[StephenTetorka]

Hi All:

As I understand it, low level modulation is anything prior to the amp.

Therefore, is it possible to modulate the grid oscillator RF input signal - 
crystal or otherwise - and expect an AM output?

Next question: how?

Regards,
Steve
WA2TAK

Re: [AMRadio] AM space

[k0ng]

Hi Steve: Yes, Rothman Modulation is a sort of "clamp tube" modulation
where a tube is placed at the antenna output point and the RF is "clamped"
to look like 100% modulation. As I recall, it mainly modulates downward to
acheive modulation because there is no sideband power from the modulator
to add to the carrier. There were Rothman Modulators sold around 1950. They
were popular for a while because the CW transmitters could be changed to AM
without any modifications to the transmitter. I might try it sometime but I will
be sure to put a low pass filter after the modulator (LP on the band
selected).  

73 , Charlie,  K0NG

Quoting [EMAIL PROTECTED]:

> Hello All:
> 
> It is my observation that there is a goodly amount of 'open' space from 14.3
> to 14.35 MHz. most of the time.
> 
> Conditions are not favorable as 75...but having ample 'elbow room' sure feels
> good.
> 
> Would it be worthwhile to consider an AM gathering location there?
> 
> PS: anyone familiar with Rothman AM modulation? 
> 
> Happy Holidays,
> 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] Lowest level modulation

[Mike Dorworth, K4XM]

Hi , it is illegal to use a modulated oscillator below about 2 meters. It
will work but adds FM even to a crystal oscillator. In fact commercial vhf
equipment using crystals actually phase modulate the crystal oscillator to
get FM. They of course go through several multiplications to get the plus
and minus 5 kc deviation.. That's kHz for youngsters!.. The rules simply
state NO!..hope this helps.. Mike K4XM
- Original Message -
From: <[EMAIL PROTECTED]>
To: 
Sent: Wednesday, December 22, 2004 8:51 PM
Subject: [AMRadio] Lowest level modulation


> Hi All:
>
> As I understand it, low level modulation is anything prior to the amp.
>
> Therefore, is it possible to modulate the grid oscillator RF input
signal -
> crystal or otherwise - and expect an AM output?
>
> Next question: how?
>
> Regards,
> 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
>
>
>
> --
> No virus found in this incoming message.
> Checked by AVG Anti-Virus.
> Version: 7.0.298 / Virus Database: 265.6.4 - Release Date: 12/22/2004
>
>



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Re: [AMRadio] AM WINDOW

[Anthony W. DePrato]

Hi John:
MERRY CHRISTMAS MY FRIEND
GOD BLESS
73 TONY WA4JQS

Anthony W. DePrato WA4JQS
Since 1962  AM
U.S. NAVY 63-70 USS ESSEX CVS 9 USS WASP CVS 18 VAW 121 SOG RVN 68-70
WA4JQS / VP8BZL / VP8SSI / 3Y0PI
CQ DX Hall Of Fame # 35

[AMRadio] Ampliphase modulation

[Jim candela]

I found an interesting web site that has a lot concerning AM. It has
detailed theory on Ampliphase modulation for a 50KW am broadcast
transmitter. I think the rig at the following link could firmly establish an
"AM Window". :-) Back up a notch with your browser for other neat topics
such as trf receivers, etc..

http://users.rcn.com/jbyrns/Ampliphase.html

Jim
WD5JKO

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Re: [AMRadio] Lowest level modulation

[Edward B Richards]

I would not modulate the oscillator, Steve. You would probably get more
FM than AM. Low level means the early stages of a transmitter. You should
have a buffer stage between the osc and the mod to prevent pulling the
osc during modulation. All stages after the modulator have to be linear.
That means class A for a single tube or class AB or B for push-pull
stages. 

73, Ed Richards K6UUZ


On Wed, 22 Dec 2004 20:51:22 EST [EMAIL PROTECTED] writes:
> Hi All:
> 
> As I understand it, low level modulation is anything prior to the 
> amp.
> 
> Therefore, is it possible to modulate the grid oscillator RF input 
> signal - 
> crystal or otherwise - and expect an AM output?
> 
> Next question: how?
> 
> Regards,
> 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] Rothman Modulation

[W7QHO]

In a message dated 12/22/04 4:14:03 PM, [EMAIL PROTECTED] writes:


> > Yup,  I own one NOS.  Manual is of course on BAMA.
> >
> 
> Under what name?
> 
> 

Found it!   Advert   in CQ, July 52 page 51.   The company was MARMAX in 
Alamogordo, NM.   BAMA site has manual for the mobile and 1 KW modulators.

Dennis D.   W7QHO
Glendale, CA

RE: [AMRadio] Lowest level modulation

[Jim candela]

Steve,

What about some of us AM'ers that have a sub-audible frequency shift with
modulation due to poor power supply regulation, and decoupling? This is
pretty common with some of our "cherished" vintage equipment. It does have a
beneficial effect though in that it when strong discourages a SSB station
from trying to zero beat. The famous BC-375 with a MO-PA arrangement had
some audio rate FM as did the BC-223 that I once had (801 osc + 801 PA
modulated with PP 46's). I believe "Timtron" Wa1HLR once had a BC-375 that
he used as the "SBE rig". SBE stood for "side band eliminator". I had dinner
once with Tim 20+ years ago where he described a TPTG 450th oscillator on 75
meters AM, FM, PM, or just "all modulation". He said it sure cleared out the
frequency, and sounded great on a wide band AM receiver.. These examples may
be illegal, but...

Regards,
Jim
WD5JKO

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Mike Dorworth, K4XM
Sent: Wednesday, December 22, 2004 8:01 PM
To: Discussion of AM Radio
Subject: Re: [AMRadio] Lowest level modulation


Hi , it is illegal to use a modulated oscillator below about 2 meters. It
will work but adds FM even to a crystal oscillator. In fact commercial vhf
equipment using crystals actually phase modulate the crystal oscillator to
get FM. They of course go through several multiplications to get the plus
and minus 5 kc deviation.. That's kHz for youngsters!.. The rules simply
state NO!..hope this helps.. Mike K4XM
- Original Message -
From: <[EMAIL PROTECTED]>
To: 
Sent: Wednesday, December 22, 2004 8:51 PM
Subject: [AMRadio] Lowest level modulation


> Hi All:
>
> As I understand it, low level modulation is anything prior to the amp.
>
> Therefore, is it possible to modulate the grid oscillator RF input
signal -
> crystal or otherwise - and expect an AM output?
>
> Next question: how?
>
> Regards,
> 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
>
>
>
> --
> No virus found in this incoming message.
> Checked by AVG Anti-Virus.
> Version: 7.0.298 / Virus Database: 265.6.4 - Release Date: 12/22/2004
>
>



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__
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net
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RE: [AMRadio] Lowest level modulation

[Jim candela]

Ed,

My recent EL-34 project runs linear AM with a single tube biased and
driven for AB2. With a resonant tank circuit on the plate you don't have to
run class A for single ended class linear amplifier. You are correct for
most audio circuits however.

Regards,
Jim WD5JKO

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Edward B Richards
Sent: Wednesday, December 22, 2004 8:07 PM
To: amradio@mailman.qth.net
Subject: Re: [AMRadio] Lowest level modulation


I would not modulate the oscillator, Steve. You would probably get more
FM than AM. Low level means the early stages of a transmitter. You should
have a buffer stage between the osc and the mod to prevent pulling the
osc during modulation. All stages after the modulator have to be linear.
That means class A for a single tube or class AB or B for push-pull
stages.

73, Ed Richards K6UUZ

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Re: [AMRadio] The AM Window

[Robert Nickels]

> I get a chuckle when someone tells me they are using a "homebrew dipole"

I have to confess, as a young teen Novice my Dad and I put up a "storebought
dipole" - one of those HyGain jobs with traps for 80/40/15 meters.
Pre-Elmer, I didn't really know any better.   For Christmas that year my
folks got me a Heath SWR bridge that I carefully put together - but
concluded was defective as it showed about 5:1 SWR.   Even so, I made lots
of CW contacts using my Halli HT-40.

But after I got my General and fired it up on AM fone, the going was a lot
tougher.  A fella who was passing thru town offered to stop by and help
check out my antenna, and guess what?  His SWR bridge read the same as mine!
With his help, the trap dipole was quickly replaced with a "real dipole"
that had a flat SWR and even my pipsqueak controlled carrier AM got out a
lot better!That was 35 years ago, and I've never bought a dipole since.

73, Bob W9RAN

Re: [AMRadio] Hamvention 2005

[David Knepper]

Peter, I have not gotten anything from the Dayton Hamvention Committee?

I suspect that we may see something by January, 2005.

Please let me know if you get the customary packet for outdoor vendors.

Thank you.

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: "peter A Markavage" <[EMAIL PROTECTED]>
To: 
Cc: <[EMAIL PROTECTED]>
Sent: Wednesday, December 22, 2004 9:18 PM
Subject: [AMRadio] Hamvention 2005


> Has anyone, who was a outside vendor this past year (2004), received a
> packet of info to reserve your same spaces for the 2005 Hamvention. I
> thought this stuff was suppose to be in our hands already. E-mail to the
> flea market chairman has gone unanswered.
> 
> Pete, wa2cwa
> __
> 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] Equipment Rack for Collins Radios

[Mark Bell]

Equipment Rack for Collins Radios with blower.

Weight: about 200 pounds. 
Price: $75 
Location: Wilmington DE. Pickup Only. 

The following name plate is on the rack: 

Cabinet. Electrical Equipment 
CY-1807/C 
Oneida Electronics, Inc 
Order No. 15498-PP-63 

Contact John KS3E ( [EMAIL PROTECTED] ) for details. 

I have no monetary interest in this item. Just posting it for a friend.

73 Mark K3MSB

[AMRadio] transformer

[CHRIS PAPAIOANNOU]

73 all,
looking for a 350-0-350 @ 300-350mA transformer.Not interested if 6.3V & 5.00V 
there are or not.
Merry Christmas and the happiest 2005 to all ya & ur families!
Chris SV1DAF.
From [EMAIL PROTECTED]  Wed Dec 22 22:29:44 2004
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Message-ID: <[EMAIL PROTECTED]>
From: "Mark Bell" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio" 
References: <[EMAIL PROTECTED]>
Subject: Re: [AMRadio] AM Window on 15 Meters?
Date: Wed, 22 Dec 2004 22:18:32 -0500
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X-List-Received-Date: Thu, 23 Dec 2004 03:29:44 -

Awk!!  There is no "AM Window" on 15 meters.  You can use the entire phone
band.  Typically though, AM activity is around 21.420.

As to why it isn't used much, I suspect it's because 10M has been good.  As
we head further into the sunspot doldrums, you'll probably see more activity
on 15M.

A lot of us that are 10M addicts monitor 29.0 whilst putzing in the shack.
It would probably be a good idea to set a second receiver on 21.420!   I'm
not sure what the AM calling frequency is for 15 though, it might not be
21.420.  Check the band plan.

73 Mark K3MSB


.
- Original Message -
From: "Mike Duke, K5XU" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio" 
Sent: Wednesday, December 22, 2004 5:48 PM
Subject: [AMRadio] AM Window on 15 Meters?


> As 10 meters began its decline a few years ago, I would often ask AM
> operators if they ever used 15 meters. With very few exceptions, the
answer
> would usually go something like: "No, because I never hear anyone else
down
> there."
>
> There was AM activity for a brief time around 21.400, and on 21.430. But,
in
> casual tuning on the weekends, I have heard less than 5 AM stations on 15
> meters within the past year.
>
> I say all that to ask just where is the "AM window" on 15 meters?
>
> And, why don't more of us operate there?
>
> Unless there's a contest, 15 meters is usually not crowded. Those of us
who
> run rice boxes or similar power can usually hold our own there once a
> contact is established.
>
>
> Mike Duke, K5XU
> American Council of Blind Radio Amateurs
>
>
>
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>

Re: [AMRadio] Hamvention 2005

[W4AWM]

I have not received anything for 2005 either and have had an outside space 
for many years.

Season's greetings to all.

John,  W4AWM

Re: [AMRadio] AM WINDOW

[W4AWM]

Hi Tony,

I don't know if I am the John you referred to, but Merry Christmas and a 
happy, healthy and prosperous New Year to you, too.

73,  

John,  W4AWM

Re: [AMRadio] Lowest level modulation

[Mike Sawyer]

My RCA ET-4336F is a SBE. Due to the fact it uses single source B+. Its 
legit though because I am not intentionally modulating the oscillator. The 
PM/FM is being generated due to poor voltage regulation. The rig uses a 
Thyrite resistor with taps for the bias voltages. It is pretty simple but 
not very effective.
Mike(y)
W3SLK
- Original Message - 
From: "Jim candela" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio" 
Sent: Wednesday, December 22, 2004 9:17 PM
Subject: RE: [AMRadio] Lowest level modulation


Steve,

What about some of us AM'ers that have a sub-audible frequency shift with
modulation due to poor power supply regulation, and decoupling? This is
pretty common with some of our "cherished" vintage equipment. It does have a
beneficial effect though in that it when strong discourages a SSB station
from trying to zero beat. The famous BC-375 with a MO-PA arrangement had
some audio rate FM as did the BC-223 that I once had (801 osc + 801 PA
modulated with PP 46's). I believe "Timtron" Wa1HLR once had a BC-375 that
he used as the "SBE rig". SBE stood for "side band eliminator". I had dinner
once with Tim 20+ years ago where he described a TPTG 450th oscillator on 75
meters AM, FM, PM, or just "all modulation". He said it sure cleared out the
frequency, and sounded great on a wide band AM receiver.. These examples may
be illegal, but...

Regards,
Jim
WD5JKO

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Mike Dorworth, K4XM
Sent: Wednesday, December 22, 2004 8:01 PM
To: Discussion of AM Radio
Subject: Re: [AMRadio] Lowest level modulation


Hi , it is illegal to use a modulated oscillator below about 2 meters. It
will work but adds FM even to a crystal oscillator. In fact commercial vhf
equipment using crystals actually phase modulate the crystal oscillator to
get FM. They of course go through several multiplications to get the plus
and minus 5 kc deviation.. That's kHz for youngsters!.. The rules simply
state NO!..hope this helps.. Mike K4XM
- Original Message -
From: <[EMAIL PROTECTED]>
To: 
Sent: Wednesday, December 22, 2004 8:51 PM
Subject: [AMRadio] Lowest level modulation


> Hi All:
>
> As I understand it, low level modulation is anything prior to the amp.
>
> Therefore, is it possible to modulate the grid oscillator RF input
signal -
> crystal or otherwise - and expect an AM output?
>
> Next question: how?
>
> Regards,
> Steve
> WA2TAK
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>
>
>
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>
>



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Re: [AMRadio] AM WINDOW

[Anthony W. DePrato WA4JQS]

YEP you are that guy south of me i sent it too hi..
been cooking in one of my HT 32's for a week now. I am off next week and 
going to pull the tranny out of my Globe Champ 350A and send it to Gary to 
rewind.

cu on the bands
73 Tony


At 10:33 PM 12/22/2004 -0500, you wrote:

Hi Tony,

I don't know if I am the John you referred to, but Merry Christmas and a
happy, healthy and prosperous New Year to you, too.

73,

John,  W4AWM
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