Re: [AMRadio] Johnson 226-1

[Bob Maser]

A 226-1 and -3 are air inductors.  Where's the PCB going to come from?
Besides, there's lots of PCB oil filled caps being used in ham power 
supplies, which is OK if they don't leak.  If they do leak just remove them 
and don't drink from it.  You'll be OK


Bob
- Original Message - 
From: "crawfish" <[EMAIL PROTECTED]>

To: "Discussion of AM Radio" 
Sent: Wednesday, September 21, 2005 11:00 PM
Subject: Re: [AMRadio] Johnson 226-1



If it was a power supply cap, they might have PCB's, but not an air
inductor.
   Joe W4AAB
- Original Message -
From: <[EMAIL PROTECTED]>
To: 
Sent: Wednesday, September 21, 2005 9:30 PM
Subject: Re: [AMRadio] Johnson 226-1



If it was in a Viking I, it may well have PCBs in it.  Be careful.

73,

John,  W4AWM
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Re: [AMRadio] Johnson 232-620

[Mike Dorworth,K4XM]

Correction: it is a 232-620. Paralax error reading handbook!
- Original Message - 
From: "Mike Dorworth,K4XM" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio" 
Sent: Wednesday, September 21, 2005 10:48 PM
Subject: [AMRadio] Johnson 232-620


Edgewise wound, 1/4" copper strip, cadmium plated, glass bonded mica
supporting bars. Widely used commercially. Safely handles more that 1000
watts.  232-622 winding  8 5/16" Long, 4" ID. 84 Microhenry.


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Re: [AMRadio] Pi-Net vs Link Couple

[Mike Dorworth,K4XM]

The Pi-Net will give a total of 50 db suppresion of harmonics. about 20 in
one spot and 30 in the other. Link couple can pass harmonics to VHF by
capacity coupling, hence the Faraday Shield Links used for same later on.
There is a nice single 450th Pi-Net rig shown in the Editor and Engineers
handbook. Also a couple of single ended ones in the 1950 ARRL Handbook (for
triodes).  Some triodes that require lots and lots or drive can unbalance
the grid tank, which is required for triodes using Pi-Net. Lo capacity tubes
like the 450th is OK. The old timers mostly used tuners (antenna) and open
wire feeders to keep the harmonics down. Hazletine link neutralization can
also be used and no split tanks are needed in or out. Remember Class C ,
which is required for Hi level AM, is a extreme distortion  and harmonic
generator so that some plan need to be in place to handle the soup. Also a
single band dipole is very frequency selective and cuts way down on
harmonics by itself. Multiband dipoles, beams and multi dipole on one feeder
and traps etc (G5RV) are an open invitation to spread gook with only link
output. Also the guys that use CB lin years with no half wave filters get
away in mobile service without too many problems  due to the narrow
frequency discrimination of mobile antennas. Hope this helps, 73 Mike



- Original Message - 
From: "Geoff" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio" 
Sent: Wednesday, September 21, 2005 10:45 PM
Subject: [AMRadio] Pi-Net vs Link Couple


> SO, here we are, well past 1991 and the 'law' that went into effect
> saying that 1,500w PEP output is the maximum RF Power output that we
> hams can run, regarldless of mode.  That doesn't deter the homebrewing
> spirit, but it does suggest that acheiving 1,500w PEP output is much
> easier than producing 1kW DC input to the final.  With the mindset of
> still wanting to use the classic high-level plate modulation scheme,
> engineering a rig to use only one tube in the final (a 4-250, 250TH,
> 304TH/TL, 4-400, etc), modulated by a pair seems to make more common
> sense.  That, and it's a bit more economic in filament requirements.
>
> I've heard recently that matching the output of the Class C
> pate-modulated final to the antenna is better, and more efficiently
> achieved by link coupling, vs Pi-Net.  On the other hand, it's argued
> that Pi-Net coupling produces less RFI than link coupling does.
>
> So, which is better?
>
> Why?
>
> What are the effects of nuetralizing a single tube in a balanced tank
> circuit?  If Pi-Net is to be used, does the final tube still need to be
> nuetralized?
>
> I know of a guy who wants to build a rig using a single 450TL in the
> final, modulated by a pair.  He wants to pi-net the output, but I've
> heard that's a bad idea.
>
> I want to build a rig using a medium powered tride, perhaps a 250TH,
> modulated by a pair of 811's.  Pi-Net, or Link Couple?
>
> I like seeing this kind of technical discussion on the list.  I'm
> looking forward to all inputs.
>
> --
> 73 = Best Regards,
> -Geoff/W5OMR
>
> __
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> AM List Admin: Brian Sherrod/w5ami
>

[AMRadio] Johnson 232-620

[Mike Dorworth,K4XM]

Edgewise wound, 1/4" copper strip, cadmium plated, glass bonded mica supporting 
bars. Widely used commercially. Safely handles more that 1000 watts.  232-622 
winding  8 5/16" Long, 4" ID. 84 Microhenry.


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If it was a power supply cap, they might have PCB's, but not an air
inductor.
Joe W4AAB
- Original Message -
From: <[EMAIL PROTECTED]>
To: 
Sent: Wednesday, September 21, 2005 9:30 PM
Subject: Re: [AMRadio] Johnson 226-1


> If it was in a Viking I, it may well have PCBs in it.  Be careful.
>
> 73,
>
> John,  W4AWM
> __
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>

[AMRadio] Pi-Net vs Link Couple

[Geoff]

SO, here we are, well past 1991 and the 'law' that went into effect 
saying that 1,500w PEP output is the maximum RF Power output that we 
hams can run, regarldless of mode.  That doesn't deter the homebrewing 
spirit, but it does suggest that acheiving 1,500w PEP output is much 
easier than producing 1kW DC input to the final.  With the mindset of 
still wanting to use the classic high-level plate modulation scheme, 
engineering a rig to use only one tube in the final (a 4-250, 250TH, 
304TH/TL, 4-400, etc), modulated by a pair seems to make more common 
sense.  That, and it's a bit more economic in filament requirements.


I've heard recently that matching the output of the Class C 
pate-modulated final to the antenna is better, and more efficiently 
achieved by link coupling, vs Pi-Net.  On the other hand, it's argued 
that Pi-Net coupling produces less RFI than link coupling does.


So, which is better?

Why?

What are the effects of nuetralizing a single tube in a balanced tank 
circuit?  If Pi-Net is to be used, does the final tube still need to be 
nuetralized?


I know of a guy who wants to build a rig using a single 450TL in the 
final, modulated by a pair.  He wants to pi-net the output, but I've 
heard that's a bad idea.


I want to build a rig using a medium powered tride, perhaps a 250TH, 
modulated by a pair of 811's.  Pi-Net, or Link Couple?


I like seeing this kind of technical discussion on the list.  I'm 
looking forward to all inputs.


--
73 = Best Regards,
-Geoff/W5OMR

Re: [AMRadio] Johnson 226-1

[Mike Dorworth,K4XM]

Johnson 226-3 Inductance 13.5 microHenry, 19.5 turns. Heavy duty rotary
inductor for amateur and commercial use. Handle over a KW of modulated RF
energy to 30 mHz. Winding 1/4" x 1/8" edgewise copper. Spring loaded
beryllium copper contact. Variable pitch winding- wide frequency coverage.
Height 6 1/2", width 4".  Guaranteed to contain NO PCB's.


- Original Message - 
From: "Bob Maser" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio" 
Sent: Wednesday, September 21, 2005 10:13 PM
Subject: Re: [AMRadio] Johnson 226-1


> My 226-3 is 14 uH and is good for a lot more goo that that.
>
> Bob  W6TR
> - Original Message - 
> From: "Barrie Smith" <[EMAIL PROTECTED]>
> To: "Mike Dorworth, K4XM" <[EMAIL PROTECTED]>; "Discussion of AM Radio"
> 
> Sent: Wednesday, September 21, 2005 9:56 PM
> Subject: Re: [AMRadio] Johnson 226-1
>
>
> > TNX, Mike
> >
> >
> > - Original Message - 
> > From: "Mike Dorworth,K4XM" <[EMAIL PROTECTED]>
> > To: "Discussion of AM Radio" 
> > Sent: Wednesday, September 21, 2005 7:37 PM
> > Subject: Re: [AMRadio] Johnson 226-1
> >
> >
> >> 22.5 microhenry, 27 1/2 turns, 1 KW of modulated energy to 30 MHz.
> >> - Original Message - 
> >> From: "Barrie Smith" <[EMAIL PROTECTED]>
> >> To: "Discussion of AM Radio" 
> >> Sent: Wednesday, September 21, 2005 9:25 PM
> >> Subject: [AMRadio] Johnson 226-1
> >>
> >>
> >> Hello All:
> >>
> >> Anyone have the specs on the Johnson 226-1 rotary inductor?
> >>
> >> Specifically need the total inductance.
> >>
> >> 73, Barrie, W7ALW
> >> __
> >> AMRadio mailing list
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> >>
> >> __
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> >>
> >
> > __
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>

Re: [AMRadio] Johnson 226-1

[W4AWM]

If it was in a Viking I, it may well have PCBs in it.  Be careful.

73,

John,  W4AWM

Re: [AMRadio] Johnson 226-1

[Bob Maser]

My 226-3 is 14 uH and is good for a lot more goo that that.

Bob  W6TR
- Original Message - 
From: "Barrie Smith" <[EMAIL PROTECTED]>
To: "Mike Dorworth, K4XM" <[EMAIL PROTECTED]>; "Discussion of AM Radio" 


Sent: Wednesday, September 21, 2005 9:56 PM
Subject: Re: [AMRadio] Johnson 226-1



TNX, Mike


- Original Message - 
From: "Mike Dorworth,K4XM" <[EMAIL PROTECTED]>

To: "Discussion of AM Radio" 
Sent: Wednesday, September 21, 2005 7:37 PM
Subject: Re: [AMRadio] Johnson 226-1



22.5 microhenry, 27 1/2 turns, 1 KW of modulated energy to 30 MHz.
- Original Message - 
From: "Barrie Smith" <[EMAIL PROTECTED]>

To: "Discussion of AM Radio" 
Sent: Wednesday, September 21, 2005 9:25 PM
Subject: [AMRadio] Johnson 226-1


Hello All:

Anyone have the specs on the Johnson 226-1 rotary inductor?

Specifically need the total inductance.

73, Barrie, W7ALW
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Re: [AMRadio] 100 microhenry inductor

[Bob Bruhns]

Brian is right.  For receive, a small slug-tuned coil would probably work.  But 
for transmitting, it would flame out quick!  You
would need a heavy wire coil like Barrie described, and/or a rotary inductor of 
similar dimensions.

Bacon, WA3WDR


- Original Message - 
From: <[EMAIL PROTECTED]>
To: "Discussion of AM Radio" 
Sent: Wednesday, September 21, 2005 9:35 PM
Subject: Re: [AMRadio] 100 microhenry inductor


> Hmmm, shunt feed on a tower usually only requires a series
> capacitor.
>
> However, if you DO need an inductor this would NOT be a good
> idea - using a small slug-tuned core type of coil!
>
> On 21 Sep 2005 at 8:32, Barrie Smith wrote:
>
> > I don't know if slug tuning would work.
> >
> > The coil, as I see it, would be something close to 70 turns #8 wire, wound
> > on a 4" form, length unkown, as yet.
> >
> > It's to be used as part of a pi network for a 160M shunt-fed tower.
> >
> > I can make one.  I just became curious, while thinking about it, if there
> > was such a thing as a 100 microhenry inductor.
> >
> > I think Colin's idea of part fixed and part variable is well worth
> > considering.
> >
> > 73, Barrie, W7ALW
> >
> > - Original Message - 
> > From: <[EMAIL PROTECTED]>
> > To: "Discussion of AM Radio" 
> > Sent: Wednesday, September 21, 2005 3:58 AM
> > Subject: Re: [AMRadio] 100 microhenry inductor
> >
> >
> > > Can it be slug tuned? How many do you need?
> > >
> > > I may have some that would work.
> > >
> > > On 20 Sep 2005 at 19:39, Barrie Smith wrote:
> > >
> > >> 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
> > >> __
> > >> 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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> > >> AM List Admin: Brian Sherrod/w5ami
> > >>
> > >
> > >
> > >
> > > __
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> > >
> > >
> >
> >
> > __
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> >
>
>
>
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Re: [AMRadio] Johnson 226-1

[Barrie Smith]

TNX, Mike


- Original Message - 
From: "Mike Dorworth,K4XM" <[EMAIL PROTECTED]>

To: "Discussion of AM Radio" 
Sent: Wednesday, September 21, 2005 7:37 PM
Subject: Re: [AMRadio] Johnson 226-1



22.5 microhenry, 27 1/2 turns, 1 KW of modulated energy to 30 MHz.
- Original Message - 
From: "Barrie Smith" <[EMAIL PROTECTED]>

To: "Discussion of AM Radio" 
Sent: Wednesday, September 21, 2005 9:25 PM
Subject: [AMRadio] Johnson 226-1


Hello All:

Anyone have the specs on the Johnson 226-1 rotary inductor?

Specifically need the total inductance.

73, Barrie, W7ALW
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Re: [AMRadio] Johnson 226-1

[Mike Dorworth,K4XM]

22.5 microhenry, 27 1/2 turns, 1 KW of modulated energy to 30 MHz.
- Original Message - 
From: "Barrie Smith" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio" 
Sent: Wednesday, September 21, 2005 9:25 PM
Subject: [AMRadio] Johnson 226-1


Hello All:

Anyone have the specs on the Johnson 226-1 rotary inductor?

Specifically need the total inductance.

73, Barrie, W7ALW
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[AMRadio] Johnson 226-1

[Barrie Smith]

Hello All:

Anyone have the specs on the Johnson 226-1 rotary inductor?

Specifically need the total inductance.

73, Barrie, W7ALW
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Hmmm, shunt feed on a tower usually only requires a series
capacitor.

However, if you DO need an inductor this would NOT be a good
idea - using a small slug-tuned core type of coil!

On 21 Sep 2005 at 8:32, Barrie Smith wrote:

> I don't know if slug tuning would work.
>
> The coil, as I see it, would be something close to 70 turns #8 wire, wound
> on a 4" form, length unkown, as yet.
>
> It's to be used as part of a pi network for a 160M shunt-fed tower.
>
> I can make one.  I just became curious, while thinking about it, if there
> was such a thing as a 100 microhenry inductor.
>
> I think Colin's idea of part fixed and part variable is well worth
> considering.
>
> 73, Barrie, W7ALW
>
> - Original Message -
> From: <[EMAIL PROTECTED]>
> To: "Discussion of AM Radio" 
> Sent: Wednesday, September 21, 2005 3:58 AM
> Subject: Re: [AMRadio] 100 microhenry inductor
>
>
> > Can it be slug tuned? How many do you need?
> >
> > I may have some that would work.
> >
> > On 20 Sep 2005 at 19:39, Barrie Smith wrote:
> >
> >> 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
> >> __
> >> 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
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> > Post: mailto:AMRadio@mailman.qth.net
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> >
> >
>
>
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>

[AMRadio] RE: SWL'ers and AM (Also Philco and RCA too!

[Bob Scupp]

Blank>I. too, was attracted to amateur radio by listening to AMers on an old
Philco floor console that my dad had in the attic. In my earliest
adventures, I managed to scrounge 2 missing tubes from another Philco
table radio he had up there too that worked but had the frying pan
sound going on. Just as well, it didn't have SW bands. I still recall
one was a 6F6G and the other was a.7C6 lock pin type? Both radios
are still in my possession, too!<

Todd'Boomer' KA1KAQ and All!

As a collector and restorer of antique/classic amateur radio I learn 
different facts and stories just like we do in amateur radio. Philco 
sub-contracted their vacuum tube production to Sylvania in 1938. They 
determined that sub-contracting RCA was too expensive. Sylvania "stole" much 
of RCA's vacuum tube line, redesigned it with different specs, both physical 
and electronic into the new "Loktal" tube line and re-copyrighted it for 
themselves (Philco). This is why their electronic products from about 1938 
to the early 1950's changed to a different model/chassis number scheme. 
Since David Sarnoff and RCA had no material witnesses or documentation on 
what happened, RCA did not sue Philco/Sylvania! As you know that was 
Sarnoff's favorite legal trick to get more copyrights and patents for RCA. 
They were not alone as you know in this endeavor, There was fierce copyright 
wars in the old days. The Loktal tube design was very popular during the 
late 1940's through the 1950's for automotive radios. Since they snap locked 
into place they could not pop out of their sockets from vibrations.


This story was past along to me by my antique radio mentor and Elmer Jim 
Steuber who is also a radio amateur. He was starting his repair and 
restoration during the 1930's. He has truly been a wealth of information 
source for me. My sincere thanks to him for this story which I pass along to 
all on this thread!


Best 73's,

Bob K5SEP
Kilowatt Five Sporadic E Propagation

Best 73's,

Bob K5SEP
Kilowatt Five Sporadic E Propagation 

Re: [AMRadio] 100 microhenry inductor

[Barrie Smith]

I don't know if slug tuning would work.

The coil, as I see it, would be something close to 70 turns #8 wire, wound 
on a 4" form, length unkown, as yet.


It's to be used as part of a pi network for a 160M shunt-fed tower.

I can make one.  I just became curious, while thinking about it, if there 
was such a thing as a 100 microhenry inductor.


I think Colin's idea of part fixed and part variable is well worth 
considering.


73, Barrie, W7ALW

- Original Message - 
From: <[EMAIL PROTECTED]>

To: "Discussion of AM Radio" 
Sent: Wednesday, September 21, 2005 3:58 AM
Subject: Re: [AMRadio] 100 microhenry inductor



Can it be slug tuned? How many do you need?

I may have some that would work.

On 20 Sep 2005 at 19:39, Barrie Smith wrote:


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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Re: [AMRadio] Drying iron

[Rbethman]

Method used to dry out SUPER heavy iron:  (It was a 1500KW generator
left out uncovered at Hickam AFB, HI for over 30 days, in a wood
shipping crate with NO cover.

   We set up about 6 or 7 flood lamps for about 4 or 5 days in a
weatherproof facility (the housing meant for the installed generator. -
NOT available for use OR shipment - the 50 ton engine was included!)

   After the time passed, we used a megger followed by a Hi-Pot.

   Item recovered successfully!  Dried in 1975, STILL putting out full
power!

Bob - N0DGN

John Lyles wrote:

You could put a short on the secondary terminals, and run up the primary voltage with a variac, to where you get the full current flowing in the short. Voltage will be, of course, low, and this will heat the transformer up without overloading it. Be sure to not exceed the rated DC current, and maybe to be safe, run it only 50-75% of that. Other than this, 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. 


73
John 
K5PRO



 


Hi all,

Ok, I know this has been covered here before, but is there a
consensus on how to get the moisture out of HV plate transformers and
chokes, so they won't arc on me.  And before everyone jumps in with the
quick 
"just put it in an oven on xxx degrees for yy hours", I am working with

the
iron from a Broadcast transmitter, specifically, the Gates BC-1G so
these
things are 100, 150 lbs each, and my XYL would REALLY not like it if I
tried
to put them in her fancy oven.  They have been sitting in an
un-conditioned
but dry hanger/garage for several years, so I am certain they have
soaked up
a good deal of moisture over that time.

Thanks for any suggestions,

Don - W8HRQ
   



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--
Bob - NØDGN

+--+
|  \\"""//\\"""//  |
|   (@ @)   Bob Bethman - NØDGN(@ @)   |
+---oOOo-(_)-oOOo--oOOo-(_)-oOOo---+
| NØDGN 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-61ØI 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 |
+---.oooO---Oooo.---.oooO---Oooo.--+
|   () ()   () ()  |
|\  (   )  / \  (   )  /   |
| \ _) ( _/   \ _) ( _/|
+--+
|   Amateur Astronomer - Celestron Nexstar 8   |
| 12" f5 Dob coming soon!  Being built |
|  Meade ETX-6Ø|
|   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  |
+--.oooO---Oooo.---+
|  () ()   |
|   \  (   )  /|
|\ _) ( _/ |
|ALL E-mail received and sent scanned by AVG & Norton System Works |
+--+

Re: [AMRadio] Re: SWL'ers and AM

[Todd, KA1KAQ]

On 9/20/05, Mark Cobbeldick [KB4CVN] <[EMAIL PROTECTED]> wrote:

> 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.

The other thing to consider, one of the most excellent points IMHO:
you can still get virtually anything you need to repair or maintain
old tube gear. You can get tubes, caps, resistors, you can even get
transformers rewound if needed. But look out on your ten year old
Yaecomwood when something takes out the firmware...

I. too, was attracted to amateur radio by listening to AMers on an old
Philco floor console that my dad had in the attic. In my earliest
adventures, I managed to scrounge 2 missing tubes from another Philco
table radio he had up there too that worked but had the frying pan
sound going on. Just as well, it didn't have SW bands. I still recall
one was a 6F6G and the other was a.7C6 lock pin type? Both radios
are still in my possession, too!

What a hoot, listening not only to the AMers but to aircraft, ships at
sea, and stations like Radio Havana, Radio Moscow, and the Voice of
America. Countless hours spent day and night, tuning around the first
of many dials to come.

Is it any wonder that we can't attract younger people to radio today
when the push seems to be to make it more like the internet and less
like 'radio'?

de Todd/'Boomer'  KA1KAQ

Re: [AMRadio] Drying iron

[Todd, KA1KAQ]

On 9/20/05, Donald Chester <[EMAIL PROTECTED]> wrote:

> 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.

Absolutely. And they are usually free or dirt cheap. Easy enough to
put another 220 line in the shop or garage, and you can also use it
for baking paintwork like cabinets, panels, or car rims.

I have an old General Motors range from the 50s with radio type slide
rule dials (backlit with red needles and all) that came with the house
when I bought it. Terrible for cooking and it would be gone by now
except for the small overall size and utility of drying iron and
baking paint. I've only used it for small transformers and chokes so
far, but I plan to make a rack out of heavy rails that will sit in
bottom and straddle the element, for larger items. Until then, the old
chromed rack shelves work fine for the average painted item.

Re: [AMRadio] Drying iron

[Rbethman]

Method used to dry out SUPER heavy iron:  (It was a 1500KW generator 
left out uncovered at Hickam AFB, HI for over 30 days, in a wood 
shipping crate with NO cover.


   We set up about 6 or 7 flood lamps for about 4 or 5 days in a 
weatherproof facility (the housing meant for the installed generator. - 
NOT available for use OR shipment - the 50 ton engine was included!)


   After the time passed, we used a megger followed by a Hi-Pot.

   Item recovered successfully!  Dried in 1975, STILL putting out full 
power!


Bob - N0DGN

John Lyles wrote:

You could put a short on the secondary terminals, and run up the primary voltage with a variac, to where you get the full current flowing in the short. Voltage will be, of course, low, and this will heat the transformer up without overloading it. Be sure to not exceed the rated DC current, and maybe to be safe, run it only 50-75% of that. Other than this, 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. 


73
John 
K5PRO



 


Hi all,

Ok, I know this has been covered here before, but is there a
consensus on how to get the moisture out of HV plate transformers and
chokes, so they won't arc on me.  And before everyone jumps in with the
quick 
"just put it in an oven on xxx degrees for yy hours", I am working with

the
iron from a Broadcast transmitter, specifically, the Gates BC-1G so
these
things are 100, 150 lbs each, and my XYL would REALLY not like it if I
tried
to put them in her fancy oven.  They have been sitting in an
un-conditioned
but dry hanger/garage for several years, so I am certain they have
soaked up
a good deal of moisture over that time.

Thanks for any suggestions,

Don - W8HRQ
   



__
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
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AMfone Website: http://www.amfone.net
AM List Admin: Brian Sherrod/w5ami


 



--
Bob - NØDGN
  
+--+

|  \\"""//\\"""//  |
|   (@ @)   Bob Bethman - NØDGN(@ @)   |
+---oOOo-(_)-oOOo--oOOo-(_)-oOOo---+
| NØDGN 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-61ØI 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 |
+---.oooO---Oooo.---.oooO---Oooo.--+
|   () ()   () ()  |
|\  (   )  / \  (   )  /   |
| \ _) ( _/   \ _) ( _/|
+--+
|   Amateur Astronomer - Celestron Nexstar 8   |
| 12" f5 Dob coming soon!  Being built |
|  Meade ETX-6Ø|
|   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  |
+--.oooO---Oooo.---+
|  () ()   |
|   \  (   )  /|
|\ _) ( _/ |
|ALL E-mail received and sent scanned by AVG & Norton System Works |
+--+


   

Re: [AMRadio] Double Bazooka Antennas

[Geoff]

Geoff wrote:


[EMAIL PROTECTED] wrote:



Already at 120' long, adding another 120' meant a 240' loop of wire, 
fed wtih 60' of 450 ohm ladder line, and using a Heathkit 2060 
impedance matching device.  I don't think I'll ever go back to a 
'regular' dipole, again.
  



So basically it sounds like you had one element of a cubical quad...
No wonder it did well!!



DOES well ;-)  (I should be on the air, right now in fact.  And will 
be, when I get through with this message)


As it's been explained to me, a 'loop' is basically a folded-dipole 
that's been pulled apart.


Quad elements, Bry, by virtue of their name, have -4- sides (Quad = 
4)  Delta is more of a Triangle shaped creature (Tri = 3).


So, this three sided antenna is apex'ed at around 60', and the feed 
line is along a sloping element.  Works wonderfully well.



In fact, I just got off the air, w/W5SUM, WA5CMI, WB5WUX, W0XV, W5LJ, 
KG4UVU, W5OLI and maybe some others but I don't recall the calls.


Good signals on 75m this morning.  We try to do this in the early 
morning hours starting around 4am, because there's less SSB activity on 
the band, conditions are great for long-haul stuff and it just works for 
us.  Besides that, most of the neighbors aren't up at 4am using whatever 
electronic device that acts improperly as a radio receiver :-)


Where do we do this?  Around 3.885Mc  ERAM (Early Riser AM)

--
73 = Best Regards,
-Geoff/W5OMR

Re: [AMRadio] Double Bazooka Antennas

[Geoff]

[EMAIL PROTECTED] wrote:


On 21 Sep 2005 at 4:18, Geoff wrote:

 

Already at 120' long, adding 
another 120' meant a 240' loop of wire, fed wtih 60' of 450 ohm ladder 
line, and using a Heathkit 2060 impedance matching device.  I don't 
think I'll ever go back to a 'regular' dipole, again.
   



So basically it sounds like you had one element of a cubical quad...
No wonder it did well!!



DOES well ;-)  (I should be on the air, right now in fact.  And will be, 
when I get through with this message)


As it's been explained to me, a 'loop' is basically a folded-dipole 
that's been pulled apart.


Quad elements, Bry, by virtue of their name, have -4- side (Quad = 4)  
Detla is more of a Triangle shaped creature (Tri = 3).


So, this three sided antenna is apexed at around 60', and the feed line 
is along a sloping element.  Works wonderfully well.


--
73 = Best Regards,
-Geoff/W5OMR

Re: [AMRadio] RE: Eliminate AM!

[Dave Aabye]

Amen Don!

50% of the 80 meter band reserved for (maybe) 10% of
the activity.  Why???  

QST...QST...Is anyone awake in Newington? 

nothing heard.

73 de Dave





 

Re: [AMRadio] Double Bazooka Antennas

[bcarling]

On 21 Sep 2005 at 4:18, Geoff wrote:

> Already at 120' long, adding 
> another 120' meant a 240' loop of wire, fed wtih 60' of 450 ohm ladder 
> line, and using a Heathkit 2060 impedance matching device.  I don't 
> think I'll ever go back to a 'regular' dipole, again.

So basically it sounds like you had one element of a cubical quad...
No wonder it did well!!

73s - Brian, AF4K

Re: [AMRadio] Double Bazooka Antennas

[bcarling]

Consider the Bird Cage dipole if you want a broad bandwidth 
antenna.

They are also heavy but with the proper support and in the 
Inverted Vee configuration, I did very well with one. 
Low SWR from  3.5 to 4.0 megasickles.

On 21 Sep 2005 at 0:40, [EMAIL PROTECTED] wrote:

> Anybody have experience with Double Bazooka antennas?..Sound like a pretty 
> good antenna to me,I am considering trying one on 75mtrs..All comments 
> appreciated..Keep those filaments lit...73's Ron W6MAU
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> AM List Admin: Brian Sherrod/w5ami
> 

Re: [AMRadio] 100 microhenry inductor

[bcarling]

Can it be slug tuned? How many do you need?

I may have some that would work.

On 20 Sep 2005 at 19:39, Barrie Smith wrote:

> 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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> Home: http://mailman.qth.net/mailman/listinfo/amradio
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> Post: mailto:AMRadio@mailman.qth.net
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> AM List Admin: Brian Sherrod/w5ami
> 

Re: [AMRadio] Double Bazooka Antennas

[Geoff]

On Wed, 21 Sep 2005 00:40:35 EDT [EMAIL PROTECTED] writes:

Anybody have experience with Double Bazooka antennas?..Sound like a 
pretty good antenna to me,I am considering trying one on 75mtrs..All 
comments appreciated.




The biggest difference in antennas I've ever been first-hand witness to 
(as far as simple wire antennas) was making the change in feed line from 
coax to 450 ohm ladder line.


After that, it was when I closed in the bottom of the 75m inverted vee, 
and made a Delta-wave loop out of it.  Already at 120' long, adding 
another 120' meant a 240' loop of wire, fed wtih 60' of 450 ohm ladder 
line, and using a Heathkit 2060 impedance matching device.  I don't 
think I'll ever go back to a 'regular' dipole, again.



--
73 = Best Regards,
-Geoff/W5OMR

Re: [AMRadio] Double Bazooka Antennas

[peter markavage]

Tried a double bazooka type antenna back in the 80's on 75. Compared it
to an existing 75 meter dipole at approx. the same height. Bazooka was
considerably heavier (because of the coax weight, Large center insulator
broke in half during a windy and rainy storm. During the winter, end
supports broke on two occasions due to heavy ice loading on the larger
surface area of the coax. In the end, found no difference in performance
with either antenna. Claims of "lower noise" with the bazooka were never
seen. The claims of a wider bandwidth on the frequency range of interest
were minuscule and probably attributed to the larger surface area with
the coax. Stations on the end of a QSO could tell no difference between
either antenna. Lots written up on the web about the "fabled" claims of
the double bazooka. Personally, it's not worth the time, energy, or
expense unless you have lots of spare coax to waste. A plain old wire
dipole works just as well and probably would stay up longer.

Pete, wa2cwa

On Wed, 21 Sep 2005 00:40:35 EDT [EMAIL PROTECTED] writes:
> Anybody have experience with Double Bazooka antennas?..Sound like a 
> pretty 
> good antenna to me,I am considering trying one on 75mtrs..All 
> comments 
> appreciated..Keep those filaments lit...73's Ron W6MAU

[AMRadio] Double Bazooka Antennas

[Rivpapa1]

Anybody have experience with Double Bazooka antennas?..Sound like a pretty 
good antenna to me,I am considering trying one on 75mtrs..All comments 
appreciated..Keep those filaments lit...73's Ron W6MAU

[AMRadio] BC-610 XFMR

[Patrick Jankowiak]

I apologize, I don't hace it anymore. I went to look at it, and remembered 
I let it go with a KW 2M amp last year.


I must be getting oldzheimers' or something.

From: Patrick Jankowiak <[EMAIL PROTECTED]>

If anyone wants a BC-610 transformer, ...