[AMRadio] 100 microhenry inductor

[Barrie Smith]

Hello All:

For an antenna project, I have need for a 100 microhenry adjustable inductor.

I can wind one, and provide taps throughout.  However, I'm wondering if there 
is such a thing as a 100 microhenry rotary inductor.

And, if there is, where would I find one?

73, Barrie, W7ALW
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Date: Tue, 20 Sep 2005 19:00:17 -0700 (PDT)
From: "Mark Cobbeldick [KB4CVN]" <[EMAIL PROTECTED]>
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Subject: [AMRadio] Re: SWL'ers and AM
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Hi Bob,
Very good point about the SWL's listening to AM phone ham
transmissions.  I was one...

Back in the early 1960's, I wanted to listen to 2 MHz marine radio
traffic.  Not having enough funds to purchase a multi-band radio, I
found an old tube AM Broadcast receiver, and modified it to listen to
the 2000 to 3000 kHz band.  A couple of hundred feet of wire up in some
pine trees and a ground on our well casing pipe, I was in business!

There was a bit of lower overlap below 2000 kHz.  (As a kid, I did not
even realize that there was ham band down there.)   But was thrilled to
hear ham QSO's on 160 meters.

This lead to an interest in electronics at a tender age.  (I did not
get my novice ticket until I got out of the army, and returned home to
Miami.)  Now I work for a large two-way radio manufacturer in Virginia
as a technical support engineer.  (AKA: a cross between Mr. Goodwrench
and Dr. Phil!)

All the two-way stuff now is basically a computer with a dsp board and
an antenna jack!  :o\


The other day, I got several 'newly minted' 20'ish engineers VERY
stirred-up after working for hours on a tricky problem.  I told them:

"IF WE HAD JUST STAYED WITH VACUUM TUBES, AND AM MODULATION, WE WOULD
NOT BE IN THIS MESS!"

They were not amused...


After working on this newer stuff all day long, I sure don't want to
look at it when home.  My ham YL agrees.  So I tinker with older gear.
Easier to work on.  Plus, SSB was always too darn hard on the ol ears.
I now convert older AM Phone 2-3 MHz marine radios over to 160  & 75
meters.  Four xtal controlled channels, and I am ready to roll.


73,
Mark Cobbeldick, KB4CVN  (Ex: C6AMC)
Monroe, VA



- Original Message -
From: "Bob Bruhns" <[EMAIL PROTECTED]>
To: 
Sent: Sunday, September 18, 2005 1:10 PM
Subject: Re: [AMRadio] The zeal to eliminate AM mode on the amateur
bands.




SWLs would tune the bands, but sidebanders sounded like Donald Duck, so
the AMers were the ones the SWLs listened to.  The control freaks sure
didn't like that!



   Bacon, WA3WDR


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Re: [AMRadio] Re: Wd5EHS

[Geoff]

Jim candela wrote:


<>Back around 1990, I sold my NOS UTC CVM-5 600 watt mod transformer for
$75.00 to John. Problem was we got our wires crossed, and I delivered 
it to
John Mohn, W5MEU at the same time as Sulpher John was knocking on my 
door in
Kyle, Tx. I was with Robert Sisco, K5LYT. We eventually got it 
straight, and
all had dinner curtesy of Bobby (W5MEU's XYL). That was an interesting 
day.

Anybody know what became of Sulpher John's HB KW with my old CVM-5?



I thought he was gone long before, Jim.  But, he apparently died right 
before I started traveling in/out of New Orleans, in Jan of 2002.


John (all of 'em, W5MEU,WD5EHS, WA5BXO) was/is a great guy.

heh - intrestingly enough, -all- of 'em need our prayers

;-)


--
73 = Best Regards,
-Geoff/W5OMR

Re: [AMRadio] Drying out HV transformers / Chokes

[Donald Chester]

I just took the back off of my HT-4B, which is similar to the BC-610, to 
take a look at the modulation transformer.


It looks like a "pick up with one hand" object to me.


The open frame ones with cast iron end-bells are heavier, but I still think 
it could be carried by one person using one arm.  The BC 610E used those.  
The more modern hermetically sealed ones are "pick u with one hand" objects. 
 Hopefully, they made them smaller and lighter by using more modern 
materials.


Don K4KYV

Re: [AMRadio] Drying out HV transformers / Chokes

[Donald Chester]

I have several 2.5v and 10v rusty,dirty, and rattling UTC small can S 
series filament transformers that I want rebuild and would like to know a 
source for transformer varnish and potting material, wax,tar, or whatever.
On pulling the cover off the most rattling around one I found only sections 
of corrugated cardboard to be the "packing/potting"  material !!.


Those were the "cheapies" made by UTC.  Their higher quality transformers 
were potted with tar.  Some of the older S series actually had louvres in 
the case for ventilation.  These were essentially open frame transformers 
with a protective case against physical abuse.  Later S series did use 
potting material.  These were the lowest quality transformers UTC made, and 
their ratings are for intermittent amateur service.


Don k4kyv

RE: [AMRadio] Drying iron

[Donald Chester]

, you could put a plywood or polyethylene sheet tent around it, and heat it 
with a radiant heater of any type. All you need is 120 deg F or so for so 
many days.


I would think you would need something porous or ventilated.  Even if you 
heat it, but it is surrounded with impermeable material such as plastic 
sheet, all you are doing is heating the moisture inside the transformer, and 
it will re-condens when cooled.  In needs to be able to evarorate, and that 
requires a low humidity environment.


Gas ovens are not satisfactory for this purpose, either, because water is a 
natural by-product of the combustion of natural gas and propane.  An 
electric stove oven works well.


Don k4kyv

[AMRadio] Re: AMRadio Digest, Vol 20, Issue 27

[Brian Sherrod]

That explains it Geoff.  I knew that I had been in QSO with him as late as '99 
or '00
for sure.
I was really hoping you were wrong...  Appears you are right.  Really sad to 
hear.

Brian

> We might, but I -swear- Bill Ross (K5LLK) who was close friends with
> John told me, -long- before he died (and I was -at- that funeral) that
> Sulphur John was a silent key.  John's Father was still hanging around,
> after he passed away.
>
> I knew it was true.  I can't get wrapped around my head that this is
> already 2005   :-(
>
> John A. Shelton - 2/11/2001
> SULPHUR - Memorial services for John A. Shelton, 58, will be at 4 p.m. 
> Saturday,
> Feb. 12, in Maplewood Methodist Church.
> The Rev. Karen Davis will officiate. The body will be cremated.
> Mr. Shelton died at 3:15 a.m. Thursday, Feb. 10, 2000, in his residence.
> He was a native of Ponca City, Okla., and had lived in Sulphur since 1955. He
> was a graduate of Sulphur High School and attended McNeese State University. 
> He
> was an Air Force veteran and a retired Conoco operator. He was a troop leader
> and a counselor with the Boy Scouts. He was a ham radio operator; his call
> letters were WD5EHS-73. He was a member of Maplewood Methodist Church.
> Survivors include his wife, Dianne R. Shelton of Sulphur; one son, Michael A.
> Shelton of Sulphur; one daughter, Elizabeth A. Shelton of Denver; one brother,
> Roy Scott Shelton of Sulphur; one sister, Marilyn Jean Richmond of Beaumont,
> Texas; his parents, Leonard and Jean Shelton of Sulphur; and three
> grandchildren.
>

RE: [AMRadio] Re: AM and SSB history (was: Eliminate AM)

[Donald Chester]

...In Terman's book "Radio Engineering", the standard text for this subject 
in the 30s and 40s, he points out that (in 1932) "The only single side-band 
radio system in commercial operation is the long-wave transatlantic 
telephone...", and that SSB "... is extensively used in carrier-current 
communication over wire lines, but the difficulty of producing large 
amounts of single side-band power at radio frequencies and the difficulty 
of receiving the signals have prevented single side-band transmission from 
being standard practice in radio work."



Actually, amateur SSB would have been very practical in the early 30's.  The 
vast majority of ham operation in those  days was on CW, and if a receiver 
will copy CW it will copy SSB.  I still have my 1935 model HRO, and when I 
used to use it as my station  receiver, it was stable enough to copy 20m SSB 
for hours at a time.  And it would copy it well with the simple BFO and 
diode dectector, after I increased the size of the coupling capacitance 
between the BFO and detector stage.  The xtal filter wasn't the greatest, 
but it wasn't great for AM, either.


As for the transmitter, a multi-conversion filter exciter, starting out with 
a  low frequency i.f., say below 50 kc/s and capable of generating an 
acceptable SSB signal could have been built by knowledgeable amateurs of the 
day, with components and test equipment readily available at that time.  
Such an exciter, using L-C transformers to filter out the unwanted sideband, 
would have been no more difficultt to construct than an early 
superheterodyne receiver.


Linear amplifiers capable of generating large amounts of power were already 
in use before 1930.  In fact, high power linears had been used for AM long 
before high level class-B plate modulation was developed.  The class-B audio 
amplifier was invented when it occurred to someone that a linear amplifier 
would amplify audio frequencies just as well as rf, if the proper 
transformers were used, with pushpull stages that would allow the entire 
audio cycle to be amplified.  Single ended rf linears only amplify half the 
cycle and depend on the flywheel effect of the rf tank circuit to fill in 
the missing half. The same  linear amplifiers used to generate AM would have 
worked just as well on SSB.  There were 50 kw broadcast stations on the air 
in 1930 that used linear amplifiers.


The main problem was economics, just like cathode-ray television.  Modern TV 
was developed in the mid-30's too, and regular programming began in London 
in about 1936.  But this was in the midst of the great worldwide depression, 
and most hams worldwide were lucky to be able to get on the air with a 
crude, homebrew one-tube xtal oscillator on CW, using a simple  regenerateve 
receiver.  High power transmitters, even on AM were extremely rare, as only 
the well-to-do could afford one.  The National HRO was a luxury receiver 
only a few amateurs could afford, as well.


There was a brief article about SSB in QST sometime in the early 30's, but 
the article was cut off right in the middle in mid sentence.  There was 
never any explanation why only part of the article appeared in the magazine, 
and the follow-up articles that were promised were never mentioned again.  
Reportedly, there were a few experimental amateur SSB stations on the air in 
the mid-30's.  But as in the case of TV, the technology existed but WW2 came 
along and placed development on the back burner until after the war, when 
both technoligies took off.


Don k4kyv

RE: [AMRadio] Re: Wd5EHS

[Jim candela]

Back around 1990, I sold my NOS UTC CVM-5 600 watt mod transformer for
$75.00 to John. Problem was we got our wires crossed, and I delivered it to
John Mohn, W5MEU at the same time as Sulpher John was knocking on my door in
Kyle, Tx. I was with Robert Sisco, K5LYT. We eventually got it straight, and
all had dinner curtesy of Bobby (W5MEU's XYL). That was an interesting day.
Anybody know what became of Sulpher John's HB KW with my old CVM-5?

Jim
WD5JKO

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Geoff
Sent: Tuesday, September 20, 2005 4:30 PM
To: Discussion of AM Radio
Subject: [AMRadio] Re: Wd5EHS


Brian Sherrod wrote:

>Geoff,
>
>I think something is wrong with John being an SK since the early 90's.  I
talked with
>him shortly before I moved in the late 90's along with Kent, KA5MIR.
>
>See: http://www.qrz.com/detail/WD5EHS
>
>It is not a vanity call is was renewed in '98.  Any ideas?
>
>Last I heard, his father (who lived with him) did pass away sometime in the
90's, but
>not John.
>
>We might need to make a correction on the list about him being SK.
>
>Brian
>

We might, but I -swear- Bill Ross (K5LLK) who was close friends with
John told me, -long- before he died (and I was -at- that funeral) that
Sulphur John was a silent key.  John's Father was still hanging around,
after he passed away.

I knew it was true.  I can't get wrapped around my head that this is
already 2005   :-(

John A. Shelton - 2/11/2001
SULPHUR - Memorial services for John A. Shelton, 58, will be at 4 p.m.
Saturday,
Feb. 12, in Maplewood Methodist Church.
The Rev. Karen Davis will officiate. The body will be cremated.
Mr. Shelton died at 3:15 a.m. Thursday, Feb. 10, 2000, in his residence.
He was a native of Ponca City, Okla., and had lived in Sulphur since 1955.
He
was a graduate of Sulphur High School and attended McNeese State University.
He
was an Air Force veteran and a retired Conoco operator. He was a troop
leader
and a counselor with the Boy Scouts. He was a ham radio operator; his call
letters were WD5EHS-73. He was a member of Maplewood Methodist Church.
Survivors include his wife, Dianne R. Shelton of Sulphur; one son, Michael
A.
Shelton of Sulphur; one daughter, Elizabeth A. Shelton of Denver; one
brother,
Roy Scott Shelton of Sulphur; one sister, Marilyn Jean Richmond of Beaumont,
Texas; his parents, Leonard and Jean Shelton of Sulphur; and three
grandchildren.



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Re: [AMRadio] RE: Eliminate AM!

[Donald Chester]

...The SSBers complain about bandwidth and carriers of the AM stations and 
the AMers complain about the Quack Quack
from SSB.  This may never ever be resolved as long as we are both trying to 
compete for the same space on the bandsWe take up a very small 
percentage of the total available bandwidth and we actively enjoy and 
preserve the heritage and rich history of the hobby.


There is really room for all of us! ...



73,  Jack, W9GT


Something that makes the situation worse is the present subband structure.  
During primetime evening hours, especially on winter weekends, the 75m phone 
band may be jam packed with signals to the point that it is difficult to  
find a frequency clear enough to fire up, whether on AM or SSB.  Of course, 
in amateur radio no-one is guaranteed a clear channel, and a certain amount 
of frequency overlap is to be expected under crowded condx.


But at the same time, try tuning down below 3700 kc/s.  Most likely, unless 
there is a major CW contest going on, there will be vast expanses of 
unoccupied frequency spectrum.  The CW activity is usually concentrated at 
the bottom end of the band, with a few clusters up past 3600 with a lot of 
empty space in between.  There are usually a few clusters of RTTY and other 
"digital" modes scattered above 3600, again with vast empty spaces in 
between.


If we got rid of the outdated subband system that ham radio is saddled with 
here in the US, amateurs could work out voluntary band plans to make for 
more efficient use of the spectrum we do have.  If there is still a need to 
maintain a CW-only subband mandated by the FCC, it could be cut back to 
3500-3550 and more than accomodate the amount of CW that is heard on 80m 
these days, even in midwinter.


The ARRL bandwidth proposal would expand the present phone band down by only 
an additional 25 kc/s.


The present day phone band congestion is largely artificial, due to subband 
restrictions.


Most other countries in the world, including Canada, have abandoned subbands 
years ago, and operate entirely on the basis of voluntary band plans.


160m in this country has no subbands, and the band works just fine.

Even though I am Extra class (since 1963), I wouldn't mind seeing all 
subbands eliminated, both by emission mode and licence class.  I do think we 
should have kept the 5/13/20 wpm code tests, but that's the subject of 
another topic altogether.


Don K4KYV

Re: [AMRadio] RE: GB> The True Variac

[AB3L1]

 

General Radio "Handbook of Voltage Control With The Variac  Autotransformer." 
This little treasure is a reprint photocopy of a 40-page  booklet published 
in 1963 by General Radio Company which "designed, patented,  introduced and 
manufactured" the Variac sometime around 1933. It is in an 8.5 x  x11 format. 
The 
booklet contains 12 pages on Theory and Principles, 19 pages on  circuits 
using Variacs and 8 pages on specific Variac applications. All the GR  Variac 
models are discussed in detail including connection diagrams and so  forth. One 
section shows how to use Variacs in series and parallel applications  (with the 
use of a choke to prevent current oscillation when the 2 Variacs'  brushes 
are not perfectly synchronized). Motor-driven Variacs are also  discussed. In 
short, this may be all you ever wanted to know (and then some)  about the 
mighty 
Variac. $10.50 PPD. Five copies left out of  25.

Thanks.
73, Don Merz, N3RHT



Hi Don,
Does this book have any info on the 1582A motor driven variac?
 
Bob

[AMRadio] Re: Wd5EHS

[Geoff]

Brian Sherrod wrote:


Geoff,

I think something is wrong with John being an SK since the early 90's.  I 
talked with
him shortly before I moved in the late 90's along with Kent, KA5MIR.

See: http://www.qrz.com/detail/WD5EHS

It is not a vanity call is was renewed in '98.  Any ideas?

Last I heard, his father (who lived with him) did pass away sometime in the 
90's, but
not John.

We might need to make a correction on the list about him being SK.

Brian



We might, but I -swear- Bill Ross (K5LLK) who was close friends with 
John told me, -long- before he died (and I was -at- that funeral) that 
Sulphur John was a silent key.  John's Father was still hanging around, 
after he passed away. 

I knew it was true.  I can't get wrapped around my head that this is 
already 2005   :-(


John A. Shelton - 2/11/2001
SULPHUR - Memorial services for John A. Shelton, 58, will be at 4 p.m. Saturday, 
Feb. 12, in Maplewood Methodist Church.

The Rev. Karen Davis will officiate. The body will be cremated.
Mr. Shelton died at 3:15 a.m. Thursday, Feb. 10, 2000, in his residence.
He was a native of Ponca City, Okla., and had lived in Sulphur since 1955. He 
was a graduate of Sulphur High School and attended McNeese State University. He 
was an Air Force veteran and a retired Conoco operator. He was a troop leader 
and a counselor with the Boy Scouts. He was a ham radio operator; his call 
letters were WD5EHS-73. He was a member of Maplewood Methodist Church.
Survivors include his wife, Dianne R. Shelton of Sulphur; one son, Michael A. 
Shelton of Sulphur; one daughter, Elizabeth A. Shelton of Denver; one brother, 
Roy Scott Shelton of Sulphur; one sister, Marilyn Jean Richmond of Beaumont, 
Texas; his parents, Leonard and Jean Shelton of Sulphur; and three 
grandchildren.

Re: [AMRadio] RE: AM Window and the Survival of AM

[Jim Wilhite]

Wrong Sulphur for me.  His call is still good in QRZ, or at least 
the one you mentioned.  If he has been gone since the early 90's,

 it should have expired by now
  73  Jim
W5JO


Geoff wrote:


Donald Chester wrote:



I believe Sulphur John went SK several years ago.





Sulphur, Louisiana.  Just outside of Lake Charles.

--
73, I say, means Best RegardS
-Geoff/W5OMR

Re: [AMRadio] RE: AM Window and the Survival of AM

[Geoff]

Jim Wilhite wrote:

Does anyone remember his call or full name?  I live in Sulphur and can 
find out.  I haven't heard him but just overheard someone mention him 
in passing.  I have been here almost 2 years and would have heard him 
if he was still on the air


73  Jim
W5JO

Donald Chester wrote:



I believe Sulphur John went SK several years ago.




Sulphur, Louisiana.  Just outside of Lake Charles.

--
73, I say, means Best RegardS
-Geoff/W5OMR

Re: [AMRadio] RE: AM Window and the Survival of AM

[Jim Wilhite]

Does anyone remember his call or full name?  I live in Sulphur 
and can find out.  I haven't heard him but just overheard someone 
mention him in passing.  I have been here almost 2 years and 
would have heard him if he was still on the air


73  Jim
W5JO

Donald Chester wrote:


I believe Sulphur John went SK several years ago.

Re: [AMRadio] RE: AM Window and the Survival of AM

[Geoff]

Brian Sherrod wrote:


(See original text by John Coleman below)

VERY good John.  Your words hit home for me even though I've not been around 
quite as
long as you.  Sorry OM!  You gave it away when you mentioned the 1950's TV set.
However I DO remember the TV man coming to fix the 1960's set right in our 
house.  I
sat right there on the floor with him and watched intensely wondering how all 
this
"stuff" made the pictures and sounds come in as they did.  I will also never 
forget
the "smell" coming from inside the opened up TV with the tubes hot and dust 
cooking
on the resistors.  Not long after all my questions about how this stuff worked, 
my
father came home with a used Hallicrafters S-38 so I could listen to the SW 
stations
coming in from all over the world.  My older brother and father setup a long 
wire
antenna outside and the rest is history.  I was forever hooked...

BTW, one Ham your list did not have that I noted right away was W5PYT, "Ozona 
Bob".
He made some real long "old buzzards", but nevertheless was very captivating to 
me
and a good friend.

Others I can mention who are now gone are; K5NYT Gene, W0BVA Mike,  Paul in NM 
(can't
remember his call), and I'm sure I'm forgetting some...  Oh and whatever 
happened to
"Sulphur John"?  I haven't heard from him in many years.



Sorry to inform you, Brian (and anyone else who didn't know) but Sulphur 
John/WD5EHS became a silent key, back in the early to mid 90's.


I'm sure that Ozona Bob was around, but probably up on 10, 20 and 160m 
mostly.  Back in the 'old' days, I have fond memories when I was a kid, 
watching dad work stations like K5SWK, K5OCW, W5BCD, W5TMI, W5HVU, 
W5HQJ, K5MOF, K5HLP, K5DKM, W5FAO, W5FAP (who, by the way, is still 
alive, and Alton will be 99 years old, the first or second weed of 
October) and many, many more.  But, those were pretty much back then, 
strictly 40m operators.  Later, Otis and a couple of others moved ot 
75m, and dad never left 40.


All in all, I think John's point was, that since he got his ticket at 
the ripe old age of 15, in 1963, those were the hams that were known to 
him, and he to them, because they all pretty much lived relativly close 
to each other.


On my personal list of mentors and elmers, I would proudly include 
WA5BXO, right after W5OMR (my Dad). 

After all, John did engineer one of the best AM rigs I think I've ever 
been witness to...

a pair of 304TH's modulated by (4) 813's in push-pull parallel. (pre-1991)

The 813's are still in use, although running a business, raising kids 
and keeping the wife happy preclude much amatuer time (I'm saddened to say)



--
73 = Best Regards,
-Geoff/W5OMR

RE: [AMRadio] RE: AM Window and the Survival of AM

[Donald Chester]

I believe Sulphur John went SK several years ago.

[AMRadio] RE: AM Window and the Survival of AM

[Brian Sherrod]

(See original text by John Coleman below)

VERY good John.  Your words hit home for me even though I've not been around 
quite as
long as you.  Sorry OM!  You gave it away when you mentioned the 1950's TV set.
However I DO remember the TV man coming to fix the 1960's set right in our 
house.  I
sat right there on the floor with him and watched intensely wondering how all 
this
"stuff" made the pictures and sounds come in as they did.  I will also never 
forget
the "smell" coming from inside the opened up TV with the tubes hot and dust 
cooking
on the resistors.  Not long after all my questions about how this stuff worked, 
my
father came home with a used Hallicrafters S-38 so I could listen to the SW 
stations
coming in from all over the world.  My older brother and father setup a long 
wire
antenna outside and the rest is history.  I was forever hooked...

BTW, one Ham your list did not have that I noted right away was W5PYT, "Ozona 
Bob".
He made some real long "old buzzards", but nevertheless was very captivating to 
me
and a good friend.

Others I can mention who are now gone are; K5NYT Gene, W0BVA Mike,  Paul in NM 
(can't
remember his call), and I'm sure I'm forgetting some...  Oh and whatever 
happened to
"Sulphur John"?  I haven't heard from him in many years.

Brian / w5ami

--
What AM Is To Me

by John E. Coleman, WA5BXO

Operating AM is not about communicating using the most efficient mode of
transmission or the latest technology. It is about technical
understanding of what is really happening in one's transmitter. Not just
the standard old definitions but down in the nitty-gritty. It is about
understanding the technology of old and new. It's about understanding
why one circuit is better suited for a job than another even though both
have the same definition. It is about home-brew equipment and
modifications. It is about fellowship and a gentleman's mannerisms. It
is about fun in learning. It's a little new stuff mixed with some
nostalgia and used in a mode that is pleasurable to the operator and the
listener.

Sounds a lot like Ham Radio in general.

Don't misunderstand me, there is a lot more to Ham Radio than operating
AM. There are so many aspects of Ham Radio that I'm sure I could not do
the list justice. For this I am glad. Ham Radio has always been the
seeds of electronic and communication technology. And I hope it
continues to be.

Somewhere deep in my brain are the memories of the days of learning and
wonderment. I can not forget the first time I saw the bottom of the
Sears 1950 TV as the repairman went in with his meter and hand tools to
repair the set so that I could watch Roy Rogers and Dale Evans on the
next Saturday Morning. All the tubes glowing and how did it get in there
(the picture and the sound) I asked myself and many others. Then later
while in high school and having upgraded to general class, I was
privileged to not only see some of the greatest radio transmitters to
have ever been home brewed, but I was known by the men that built them
on a first name basis. Walking in to the shack of K5SWK in the evening
to see the 833s and 866s glowing and to hear the feedback from the
modulation transformer and slight hum of the pole pegs is a memory that
will always make me stop what I doing and ponder the nostalgia. Do I
operate AM because I can't let go of a childhood memory? You bet I do.
And I hope to stir some of those memories in others if possible and to
plant some seeds of my own.

Many Thanks and 73 to those Elmers

Wayne, W5FJS
Otis, K5SWK
Tom, K5IBW
Koby, K5MZH
Jake, K5IQV
Bill, WA5DWX Gene, WA5ATH
Gene, W5HQJ
Roy, W5MRY
Steve, K5LTK
Ronnie, K5MKB
Don, K4KYV

This is just to name a few and I know that a lot are silent keys and
some have changed their calls. But I will always remember them with the
calls heard first.

---

[AMRadio] FS: Glen Martin 50' aluminum tower with "Hazer"(PRICE REDUCED)

[Frank J. Mercurio]

I have for sale a Glen Martin Engineering 50', 18" face aluminum tower 
with the famous "Hazer" (#H-6) system for raising and lowering your 
antenna and rotor. Also included is the tilt base. This is part of the 
Glen Martin model M-1850A package, which currently sells for $2341.95.


Buyer supplies 210' Kevlar guy cable, turnbuckles(3ea #TB-3806),
guy anchors(3ea #ES-40) and tower concrete footing (CHB-18)to complete 
the package.


All items are currently available through Glen Martin Engineering 
(www.glenmartin.com).


Price:  $550.00

For pickup only:
Schaumburg, IL
Phone:  847-524-2546
Email:  [EMAIL PROTECTED]

[AMRadio] RE: GB> The True Variac

[Merz Donald S]

Reminder to all--I still have five copies left of the Variac manual below...

General Radio "Handbook of Voltage Control With The Variac Autotransformer." 
This little treasure is a reprint photocopy of a 40-page booklet published in 
1963 by General Radio Company which "designed, patented, introduced and 
manufactured" the Variac sometime around 1933. It is in an 8.5 x x11 format. 
The booklet contains 12 pages on Theory and Principles, 19 pages on circuits 
using Variacs and 8 pages on specific Variac applications. All the GR Variac 
models are discussed in detail including connection diagrams and so forth. One 
section shows how to use Variacs in series and parallel applications (with the 
use of a choke to prevent current oscillation when the 2 Variacs' brushes are 
not perfectly synchronized). Motor-driven Variacs are also discussed. In short, 
this may be all you ever wanted to know (and then some) about the mighty 
Variac. $10.50 PPD. Five copies left out of 25.

Thanks.
73, Don Merz, N3RHT

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Ralph
Zekelman
Sent: Monday, September 19, 2005 8:06 PM
To: [EMAIL PROTECTED]
Subject: GB> The True Variac


Can anyone supply the specs for a General Radio
Model 200B Variac? The unit is removed from a
1947 Raytheon diathermy apparatus. The variac
looks heavy enuff for at least 10 A.

This thing is interesting because GR has the name VARIAC
embossed into the bakelite frame. It appears that GR may
have originated the variac name which has now become
generic for all variable transformers of the general type.

ZEKE
W9HZX
 
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Access, copying or re-use of the e-mail or any information contained therein by 
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Re: [AMRadio] RE: AM Window and the Survival of AM

[Geoff]

John doesn't like to blow his own horn.  He gets emarrassed when someone 
gives him credit for something.


Forgive me, my friend.  Some of the newer guys here, need to see this.

73 = Best RegardS
-Geoff/W5OMR



from http://www.amwindow.org/features/htm/wa5bxo.htm

What AM Is To Me

by John E. Coleman, WA5BXO

Operating AM is not about communicating using the most efficient mode of 
transmission or the latest technology. It is about technical 
understanding of what is really happening in one's transmitter. Not just 
the standard old definitions but down in the nitty-gritty. It is about 
understanding the technology of old and new. It's about understanding 
why one circuit is better suited for a job than another even though both 
have the same definition. It is about home-brew equipment and 
modifications. It is about fellowship and a gentleman's mannerisms. It 
is about fun in learning. It's a little new stuff mixed with some 
nostalgia and used in a mode that is pleasurable to the operator and the 
listener.


Sounds a lot like Ham Radio in general.

Don't misunderstand me, there is a lot more to Ham Radio than operating 
AM. There are so many aspects of Ham Radio that I'm sure I could not do 
the list justice. For this I am glad. Ham Radio has always been the 
seeds of electronic and communication technology. And I hope it 
continues to be.


Somewhere deep in my brain are the memories of the days of learning and 
wonderment. I can not forget the first time I saw the bottom of the 
Sears 1950 TV as the repairman went in with his meter and hand tools to 
repair the set so that I could watch Roy Rogers and Dale Evans on the 
next Saturday Morning. All the tubes glowing and how did it get in there 
(the picture and the sound) I asked myself and many others. Then later 
while in high school and having upgraded to general class, I was 
privileged to not only see some of the greatest radio transmitters to 
have ever been home brewed, but I was known by the men that built them 
on a first name basis. Walking in to the shack of K5SWK in the evening 
to see the 833s and 866s glowing and to hear the feedback from the 
modulation transformer and slight hum of the pole pegs is a memory that 
will always make me stop what I doing and ponder the nostalgia. Do I 
operate AM because I can't let go of a childhood memory? You bet I do. 
And I hope to stir some of those memories in others if possible and to 
plant some seeds of my own.


Many Thanks and 73 to those Elmers

Wayne, W5FJS
Otis, K5SWK
Tom, K5IBW
Koby, K5MZH
Jake, K5IQV
Bill, WA5DWXGene, WA5ATH
Gene, W5HQJ
Roy, W5MRY
Steve, K5LTK
Ronnie, K5MKB
Don, K4KYV

This is just to name a few and I know that a lot are silent keys and 
some have changed their calls. But I will always remember them with the 
calls heard first.

[AMRadio] RE: AM Window and the Survival of AM

[Bob Scupp]

BlankPete, Jack, Darrell, Donald and All-

"Well, I must be mellowing. I have to agree with Paul. Constraining AM QSO's 
to an imaginary window (since for the most part, only AM'ers really 
acknowledge that it exists) can be counterproductive. Unless you like 6, 8, 
10, 14 member roundtables,  grab the receiver tuning knob and find a vacant 
spot elsewhere on the dial and then move the VFO dial there. I have called 
CQ numerous times on AM, out of the imaginary window, and have been answered 
by AM'ers. Many times I get answered by SSB'ers who don't realize I'm on AM, 
and after telling them so, they press that AM button their transceiver, and 
we have a great QSO. Some even comment that this was the first time they 
tried that button. It always winds up being an enjoyable experience for both 
sides and we get to spread the super sound of AM."


Pete, wa2cwa

First I wish to thank those like Darrell and Donald for posting the 
historical background on this issue. I first got my Novice ticket in 
September, 1967 as WN2CXS in Passaic, New Jersey. My second transmitter as 
an upgrade to General Class as WA2CXS was an E.F. Johnson Viking II with 
matching external VFO in 1968.  remember the enjoyment of working AM on 40 
and 75 meters back then. It was truly a blast!


I believe as Pete and others have mentioned in one form or another that our 
flexibility in our operating practices on AM is utmost important. While our 
main objective is to enjoy Amateur Radio, it's survival for the future has 
become extremely important. While there have been many disagreements in the 
past between different operating modes, it should not distract us from those 
such as BPL and commercial interests who want to interfere and/or buy us out 
of what we are licensed for and use. This has been a concern of mine for a 
long time and even more so ever today.


I am very proud and honored to be a participant in this AMRadio group! I 
will post and assist in anyway I can.


Best 73's,

Bob K5SEP
Kilowatt Five Sporadic E Propagation

Re: [AMRadio] Anyone have?

[Todd, KA1KAQ]

On 9/19/05, Jim Wilhite <[EMAIL PROTECTED]> wrote:
> Does anyone have a junker 75A2 out there?  I need the ferrite
> core for my 10 meter antenna coil.


Jim - 

I have a couple of donors but getting to them might take a few
minutes. Shoot me your address or confirm if you're okay on QRZ and
I'll se if I can get one out to you this weekend.

~ Todd/'Boomer'  KA1KAQ

Re: [AMRadio] Anyone have?

[Jim Wilhite]

HI Ronnie.  I sent him a message late Sunday but haven't heard 
from him yet.  Good to see you as well.  Those kind of things are 
not as much fun because we never have enough time to spend 
together.  See you next time.


73  Jim
W5JO

ronnie.hull wrote:

Jim
contact Howard Mills W3HM... I bet he can help

it was good shaking your paw and having an eyeball qso last weekend!!

take care friend

Ronnie - W5SUM



-- Original Message ---
From: Jim Wilhite <[EMAIL PROTECTED]>
To: AM Radio Discussion List , Boatanchors Mail List 
<[EMAIL PROTECTED]>

Sent: Mon, 19 Sep 2005 21:06:55 -0500
Subject: [AMRadio] Anyone have?


Does anyone have a junker 75A2 out there?  I need the ferrite 
core for my 10 meter antenna coil.


Am not sure if the A1 or A3 is the same, or any other for that 
matter, but would bet they could be.


If anyone has something they would sell or trade, I would be 
appreciative.  Please email direct to limit extraneous messages 
on the board.


73  Jim
W5JO

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Help: http://mailman.qth.net/mmfaq.html
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AM List Admin: Brian Sherrod/w5ami


--- End of Original Message ---

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AM List Admin: Brian Sherrod/w5ami


.

[AMRadio] Schematic Search Woes

[Bill Pancake]

Once again I'd like to ask for the group's help in finding a CORRECT schematic 
for a rig I'm trying to breath some life back into. Will gladly pay copying & 
postage costs.

I've had no luck at all finding the "correct" schematic for my SWAN 500C 
(serial# I 246515). 

It's the one with the 3-position mode switch (CAL-REC-TUNE/CW), the 6BN8 tube 
(V11) mounted UNDER the chassis (no typo here, it is mounted on a small pc 
board under the chassis) and has a 6JH8 for the modulator tube.

Any help would be greatly appreciated. Thanks & 73, Bill, [EMAIL PROTECTED] 

Re: [AMRadio] Anyone have?

[ronnie.hull]

Jim
contact Howard Mills W3HM... I bet he can help

it was good shaking your paw and having an eyeball qso last weekend!!

take care friend

Ronnie - W5SUM



-- Original Message ---
From: Jim Wilhite <[EMAIL PROTECTED]>
To: AM Radio Discussion List , Boatanchors Mail List 
<[EMAIL PROTECTED]>
Sent: Mon, 19 Sep 2005 21:06:55 -0500
Subject: [AMRadio] Anyone have?

> Does anyone have a junker 75A2 out there?  I need the ferrite 
> core for my 10 meter antenna coil.
> 
> Am not sure if the A1 or A3 is the same, or any other for that 
> matter, but would bet they could be.
> 
> If anyone has something they would sell or trade, I would be 
> appreciative.  Please email direct to limit extraneous messages 
> on the board.
> 
> 73  Jim
> W5JO
> 
> __
> AMRadio mailing list
> Home: http://mailman.qth.net/mailman/listinfo/amradio
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:AMRadio@mailman.qth.net
> AMfone Website: http://www.amfone.net
> AM List Admin: Brian Sherrod/w5ami
--- End of Original Message ---

Re: [AMRadio] Drying out HV transformers / Chokes

[Geoff]

Jim candela wrote:


My BC-610 plate transformer (open frame) is available free to pick up from
Roundrock, Texas...
 


can ya bring it to Belton?

30 Sep/1 Oct

-Geoff/W5OMR

Re: [AMRadio] Drying out HV transformers / Chokes

[GBrown]

Jim:
This is what I do, rewind transformers. I know the problems you had.
Regards,
Gary...WZ1M
- Original Message - 
From: "Jim candela" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio" 
Sent: Tuesday, September 20, 2005 1:24 AM
Subject: RE: [AMRadio] Drying out HV transformers / Chokes


>
> My BC-610 plate transformer (open frame) is available free to pick up from
> Roundrock, Texas...
>
> I once rebuilt a Globe King 500 RF plate transformer, and made the
secondary
> winding w/o a ct, to save wire, and use a bridge rectifier. I did a really
> good job with it, and vacuum impregnated it, baked it, and all that.
Problem
> was however that when I went to reinstall the E & I laminations, I only
got
> about 95% of them dudes back on before I ran out of room. The core had
> shrunk on the mandrel when I rewound it. The consequence? The primary when
> excited with 120 vac was saturating (pulled 10 amps unloaded), and was
only
> OK at 105 vac and below. Turned into a door stop, and then landfill. sigh.
>
> So Gary, if you rewind your 610 plate transformer, I have a suggestion.
> Whatever the turns ratio is, maintain that, BUT increase the number of
> primary turns at least 5% to avoid the problem that I had with core
> saturation at normal 2005 line voltage.
>
> Jim
>
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] Behalf Of GBrown
> Sent: Monday, September 19, 2005 5:07 PM
> To: Discussion of AM Radio
> Subject: Re: [AMRadio] Drying out HV transformers / Chokes
>
>
> Read it closely, "MY PLANS ARE TO REWIND IT". Thats about as plane as it
> gets.
> Regards,
> Gary...WZ1M
> - Original Message -
> From: "Geoff" <[EMAIL PROTECTED]>
> To: "Discussion of AM Radio" 
> Sent: Monday, September 19, 2005 5:50 PM
> Subject: Re: [AMRadio] Drying out HV transformers / Chokes
>
>
> > GBrown wrote:
> >
> > >Speaking of HV trannys for the BC-610. I have one with a shorted
> secondary.
> > >My plans are to rewind this hunk of iron and turn the primary into a
dual
> > >voltage, 115/230. This tranny is from the "E" model. Would I have
anyone
> out
> > >there that mite be interested? Also, the transformer has those big
> beautiful
> > >cast endbells.
> > >
> >
> > interested... in?
> >
> > rewinding it?
> > Buying it?
> > rewinding and retapping it for dual primaries?
> >
> > ya gotta talk a bit clearer than that, to communicate ;-)
> >
> > --
> > 73 = Best Regards,
> > -Geoff/W5OMR
> >
> >
> >
> >
> > __
> > AMRadio mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/amradio
> > Help: http://mailman.qth.net/mmfaq.html
> > Post: mailto:AMRadio@mailman.qth.net
> > AMfone Website: http://www.amfone.net
> > AM List Admin: Brian Sherrod/w5ami
> >
> >
>
>
> __
> AMRadio mailing list
> Home: http://mailman.qth.net/mailman/listinfo/amradio
> Help: http://mailman.qth.net/mmfaq.html
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> AM List Admin: Brian Sherrod/w5ami
> --
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> AM List Admin: Brian Sherrod/w5ami
>
>

RE: [AMRadio] Drying out HV transformers / Chokes

[Jim candela]

My BC-610 plate transformer (open frame) is available free to pick up from
Roundrock, Texas...

I once rebuilt a Globe King 500 RF plate transformer, and made the secondary
winding w/o a ct, to save wire, and use a bridge rectifier. I did a really
good job with it, and vacuum impregnated it, baked it, and all that. Problem
was however that when I went to reinstall the E & I laminations, I only got
about 95% of them dudes back on before I ran out of room. The core had
shrunk on the mandrel when I rewound it. The consequence? The primary when
excited with 120 vac was saturating (pulled 10 amps unloaded), and was only
OK at 105 vac and below. Turned into a door stop, and then landfill. sigh.

So Gary, if you rewind your 610 plate transformer, I have a suggestion.
Whatever the turns ratio is, maintain that, BUT increase the number of
primary turns at least 5% to avoid the problem that I had with core
saturation at normal 2005 line voltage.

Jim

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of GBrown
Sent: Monday, September 19, 2005 5:07 PM
To: Discussion of AM Radio
Subject: Re: [AMRadio] Drying out HV transformers / Chokes


Read it closely, "MY PLANS ARE TO REWIND IT". Thats about as plane as it
gets.
Regards,
Gary...WZ1M
- Original Message -
From: "Geoff" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio" 
Sent: Monday, September 19, 2005 5:50 PM
Subject: Re: [AMRadio] Drying out HV transformers / Chokes


> GBrown wrote:
>
> >Speaking of HV trannys for the BC-610. I have one with a shorted
secondary.
> >My plans are to rewind this hunk of iron and turn the primary into a dual
> >voltage, 115/230. This tranny is from the "E" model. Would I have anyone
out
> >there that mite be interested? Also, the transformer has those big
beautiful
> >cast endbells.
> >
>
> interested... in?
>
> rewinding it?
> Buying it?
> rewinding and retapping it for dual primaries?
>
> ya gotta talk a bit clearer than that, to communicate ;-)
>
> --
> 73 = Best Regards,
> -Geoff/W5OMR
>
>
>
>
> __
> AMRadio mailing list
> Home: http://mailman.qth.net/mailman/listinfo/amradio
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:AMRadio@mailman.qth.net
> AMfone Website: http://www.amfone.net
> AM List Admin: Brian Sherrod/w5ami
>
>


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