Automobile air conditioning line? Or perhaps tubing from a refrigerator?
Bill
- Original Message -
From: Rick Brashear [EMAIL PROTECTED]
To: 'Discussion of AM Radio in the Amateur Service'
amradio@mailman.qth.net
Sent: Monday, July 09, 2007 6:51 PM
Subject: [AMRadio] Tubing
I need to
I would stay with copper, plated with tin or silver (you can get silver-dip
to plate copper, though it is expensive).
Steel, particularly stainless steel is a poor RF conductor. You'd be better
off with aluminum.
Are you trying to make coaxial cable or just use large conductors between
Rick, did you get my direct email to you?
Bill
- Original Message -
From: Rick Brashear [EMAIL PROTECTED]
To: 'Discussion of AM Radio in the Amateur Service'
amradio@mailman.qth.net
Sent: Monday, July 02, 2007 7:13 AM
Subject: RE: [AMRadio] Meter Revisited
Thanks Todd. It is similar
Hi Rick,
I have this one, you can see it below. If you like it you can have it.
Bill
- Original Message -
From: Rick Brashear [EMAIL PROTECTED]
To: 'Discussion of AM Radio in the Amateur Service'
amradio@mailman.qth.net
Sent: Saturday, June 30, 2007 11:27 AM
Subject: [AMRadio] Meter
I'll send it if it exactly matches your picture, but I am running IE7 and I
didn't see any picture either, even after digging into the website you
specified.
Bill
- Original Message -
From: Rick Brashear [EMAIL PROTECTED]
To: 'Discussion of AM Radio in the Amateur Service'
Do you have a picture of what the escutcheon (and/or the transmitter) look
like?
Bill
- Original Message -
From: David Knepper [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Cc: amradio@mailman.qth.net
Sent: Friday, June 22, 2007 4:39 AM
Subject: [AMRadio] Dial reproductions
I am builidng a
Try this supplier:
http://www.sourcetelsupply.com/catalog/index.php?cPath=27
- Original Message -
From: Rick Brashear [EMAIL PROTECTED]
To: 'Discussion of AM Radio in the Amateur Service'
amradio@mailman.qth.net
Sent: Sunday, May 27, 2007 9:33 AM
Subject: [AMRadio] Lacing Cord
I
Don't be afraid to use large wire in primary feeds. I have seen the result
of skimping with the result conduit noticeably warms after about 10 - 15
minutes of operation. The worst consequence is a power sag when the
transmitter comes on with the result that in the extreme, contactors won't
- Original Message -
From: Peter Markavage [EMAIL PROTECTED]
snips
Jim:
What justification would you or someone present to the FCC raise the
power level back to 1000 watts as it was a number of years ago?
And Bill said: a petition for an AM Window from 3870 to 3885.
I view the AM
- Original Message -
From: Geoff/W5OMR [EMAIL PROTECTED]
snips
Are you sure -you- know how much PEP your rig is running, without
distorting/flat-topping the peaks?
73, etc
-Geoff/W5OMR
Hi Geoff,
Been there, tried that.. have run increased carrier, and with an
asymmetrical limiter
Pete,
I think you only have to listen to the on-air comments made by the diehard
SSB operators and AM'ers to determine the motivation behind stations that
are clustered around an imaginary window.
From the AM viewpoint (this is the amradio list, isn't it?) considerable
effort has been made by AM
- Original Message -
From: J.D. Mac Aulay, WQ8U [EMAIL PROTECTED]
snips
Mike (W3SLK),
. We need to tell the ARRL directly what we want now - and also what we want
for the future. Like training some animals, a smart rap on the nose can be
very effective.
We need to recognize
From the coil, it appears to be a 80 meter amplifier, might be 40 meters...
It is probably a linear unless the transformer in the back of the 813's is a
mod trannie. It has a PI output stage, would guess the coax feed from the
loading capacitor (the big one) goes to either a t/r relay underneath
Forgot to mention, it is probably a grounded-grid design (don't see any
input tuning). Underneath, there should be two long ferrite transformers
connected between the filament transformer and the filaments of the 813's.
If there are, the circuit is a grounded grid linear amplifier. You should
be
- Original Message -
From: Bow [EMAIL PROTECTED]
To: 'Discussion of AM Radio in the Amateur Service'
amradio@mailman.qth.net
Sent: Saturday, April 21, 2007 3:06 AM
Subject: RE: [AMRadio] My Amplifer Quest took a strange turn today
Thanks Bill..
Any idea about the input impedance? For
Well stated, except for the AM window which does exist. Further the ARRL
has announced 3870 as the West Coast Calling Frequency. I do notice that it
is hard to find on the present web site.
Only one question. You seem to be very concerned about AM operation on
3970. Why haven't we ever heard
- Original Message -
From: ars.w5omr [EMAIL PROTECTED]
To: Discussion of AM Radio in the Amateur Service
amradio@mailman.qth.net
Sent: Wednesday, April 18, 2007 2:11 PM
Subject: Re: [AMRadio] the post about amfone.net post last week...
Bill Smith wrote:
Well stated, except
You are absolutely correct, Pete, no one owns any frequency in Amateur
Radio. I have operated SSB on 3870 and on a number of other frequencies
also, and will likely do so in the future. I listen before transmitting and
don't intend to interfere with other stations, and hope that other stations
Put a t/r relay in the antenna, and switch the speaker. Remember to switch
in a resistor load in place of the speaker. I think the SX-99 has 500 ohm
and 8 ohm outputs, you might bridge a 680 ohm resistor across the receiver's
high impedance terminals.
You should be feeding the receiver's 300
Try http://www.cnjradio.cn/radio.net/tubedb/read.cgi?tube=15E
Ought to make a neat AM radio transmitter. :-)
73 de Bill, ab6mt
[EMAIL PROTECTED]
- Original Message -
From: Barrie Smith [EMAIL PROTECTED]
To: Discussion of AM Radio amradio@mailman.qth.net
Sent: Sunday, April 15, 2007
Bill Smith wrote:
Try http://www.cnjradio.cn/radio.net/tubedb/read.cgi?tube=15E
Ought to make a neat AM radio transmitter. :-)
that link is broken...
Subject: [AMRadio] Eimac 15E
Anyone know where I can get a complete spec sheet for the Eimac 15E?
Didn't find a complete spec
What a horrible thing to do to a RA1000. :-(
Better to put up a tuned antenna, and restore the RA1000 to service. :-)
73 de Bill, AB6MT
[EMAIL PROTECTED]
- Original Message -
From: John Lyles [EMAIL PROTECTED]
To: amradio@mailman.qth.net
Sent: Wednesday, April 11, 2007 4:32 PM
Do you mean 45 watts carrier? (180 watts /4). You might get away with
this power level at the peak of the sunspot cycle. Otherwise, the
transmitter would be suitable as a driver for a linear amplifier.
It sounds like a fun project.
73 de Bill, AB6MT
[EMAIL PROTECTED]
- Original Message
- Original Message -
From: A.R.S. - W5AMI [EMAIL PROTECTED]
To: Discussion of AM Radio in the Amateur Service
amradio@mailman.qth.net
Sent: Monday, April 02, 2007 11:09 PM
Subject: Re: [AMRadio] AM Forum
On 4/2/07, Bill Smith [EMAIL PROTECTED] wrote:
First of all, from what can
- Original Message -
From: Rick Brashear [EMAIL PROTECTED]
To: 'Discussion of AM Radio in the Amateur Service'
amradio@mailman.qth.net
I have been unable to find a 2 RPM Synchron motor for the timing delay on
the old GE BT-20-A I am bringing back to life. I can find plenty 1 RPM,
Make that BT-20-A
- Original Message -
From: Bill Smith [EMAIL PROTECTED]
To: Discussion of AM Radio in the Amateur Service
amradio@mailman.qth.net
Sent: Monday, April 02, 2007 12:29 PM
Subject: Re: [AMRadio] Motor revisited
- Original Message -
From: Rick Brashear [EMAIL
I for one would like to see 5-land AM activity on 3870. We seem to have a
very active, if few in number, contingent of SSB operator(s) on the West
Coast Calling Frequency. Where are AM operators? There is only one station
from Oklahoma who checks in regularly to the West Coast AMI net,
- Original Message -
From: A.R.S. - W5AMI [EMAIL PROTECTED]
To: Discussion of AM Radio in the Amateur Service
amradio@mailman.qth.net
Sent: Monday, April 02, 2007 8:18 PM
Subject: Re: [AMRadio] AM Forum
On 4/2/07, Bill Smith [EMAIL PROTECTED] wrote:
I for one would like to see 5
- Original Message -
From: Rick Brashear [EMAIL PROTECTED]
To: 'Discussion of AM Radio in the Amateur Service'
amradio@mailman.qth.net
Sent: Friday, March 30, 2007 5:31 PM
Subject: [AMRadio] Timer Motor
Does anyone know of a source for Synchron timer motors? I'm in need of a
Model
Did you practice this exercise just before a test? :-}
- Original Message -
From: D. Chester [EMAIL PROTECTED]
To: amradio@mailman.qth.net
Sent: Friday, March 30, 2007 10:27 PM
Subject: [AMRadio] More electricity
In high school we used to play a variation of chicken using a
- Original Message -
From: VJB [EMAIL PROTECTED]
Man, with all the warnings on here about voltage, it's
enough to make me quit licking 9V batteries as a test.
.
Definitely bad taste.
__
AMRadio mailing list
List Rules (must
- Original Message -
From: John Lawson [EMAIL PROTECTED]
.Back in the day - there were batteries available for 'photoflash'
applications 450 terminal volts.
here, taste this big 9-v battery
FLASH! :^0
__
- Original Message -
From: [EMAIL PROTECTED]
To: Discussion of AM Radio in the Amateur Service
amradio@mailman.qth.net
When I was in High School Voc.Tech. in the late 60's we used to charge
up a good axial H.V. electrolytic with the leads wrapped around the ends and
say catch, to
Hi Rick,
I don't recall seeing any. RCA made custom equipment, and control consoles
for transmitters above 5 Kw. They were not remote control but were designed
for emplacement in front of the large transmitters. Don't know if they made
a panel for the 1R. That doesn't mean much, as only have
- Original Message -
From: John Lawson [EMAIL PROTECTED]
To: amradio@mailman.qth.net
Sent: Friday, March 23, 2007 7:16 AM
Subject: [AMRadio] 4-400 first made when?
In doing some research - I notice that the 4-400 seems to be a fairly
late arrival, at least as far as RCA is
- Original Message -
From: [EMAIL PROTECTED]
To: amradio@mailman.qth.net
Sent: Friday, March 23, 2007 1:09 PM
Subject: Re: [AMRadio] 4-400 first made when?
Brad and the group,
My posting said 20Jno such animal to my knowledge. My
age is allowing the thoughts of the
- Original Message -
From: Brett gazdzinski [EMAIL PROTECTED]
To: 'Discussion of AM Radio in the Amateur Service'
amradio@mailman.qth.net
Sent: Saturday, March 10, 2007 4:57 PM
Subject: RE: [AMRadio] new antenna (again).
Bill,
The ARRL antenna book as lengths to use, but only on
cancellation.
I will have to think about what to try next.
Brett
N2DTS
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Bill Smith
Sent: Saturday, March 10, 2007 12:26 AM
To: Discussion of AM Radio in the Amateur Service
Subject: Re: [AMRadio
Try:
http://www.datasheets.electron-tube.net/sheets/084/3/3B24WA.pdf
73 de Bill, ab6mt
[EMAIL PROTECTED]
- Original Message -
From: Rick Brashear [EMAIL PROTECTED]
To: 'Discussion of AM Radio in the Amateur Service'
amradio@mailman.qth.net
Sent: Sunday, March 11, 2007 5:24 PM
Hi Brad,
It sounds like you had the ideal antenna to begin with. There is nothing
wrong if the antenna is a bit long. Short antennas' radiation reisistance
takes a nose dive.
I've used a similar antenna for years and have enjoyed great performance.
73 de Bill, ab6mt
[EMAIL PROTECTED]
-
readily available in red, white and black.
Bill
- Original Message -
From: Bill Smith
To: Discussion of AM Radio in the Amateur Service
Sent: Friday, March 02, 2007 6:38 PM
Subject: Re: [AMRadio] Knobs
Mouser Part No. 690-5149A black, oval
Mouser Part No. 690-SSKW white, fan shaped
Mouser
Hi Brett,
Generally, you can bend an antenna all over the place as long as you =
keep the center straight and in the air. Don't bend the ends more than =
90 degrees or you will introduce cancellation with the other part of the =
antenna. Bends introduce all sorts of funny patterns, but overall
They are still available new from Mouser Electronics. They were Centralab
knobs, but think now are offered by another company.
They aren't $0.25 anymore, either.
Bill
- Original Message -
From: Rick Brashear
To: AMRadio@mailman.qth.net
Sent: Friday, March 02, 2007 5:31 PM
Subject:
mode and didn't even think they might still be around. I had another
gent remind me they are used on the Fender Tele. I kept thinking I had
seen some around here some where and I had, but they're on my Tele!
Sometimes I can't see the forest for the trees.
Thanks a million.
Rick/K5IZ
Bill Smith
Hmm... you may have shorted turns in the modulation transformer, but it is
difficult to know without terminating the secondary with a resistive load,
and measuring the power output. I would assume the transformer is the
correct part and hasn't been subsituted somewhere along the way.
I still suspect a phasing problem, perhaps a double error. For example, the
feedback may not be crossed correctly at the input transformer, and to
compensate, the output transformer could be wired out of phase. Do you have
a dual-trace oscilloscope and can you look at phasing throughout the
I notice from the schematic, that there is also a tertiary winding which is
fed to the the driver stage. Seems a long shot, but could it be out of
phase?
Also, what are you using to measure the capacitor. A digital capacitance
meter will mask a poor power factor. In other words, the cap could
According to Hoyle (was he a ham?) use ceramic capacitors for bypass in the
front end of the receiver (RF, oscillator and mixer stages) and use tubulars
for bypass and coupling in the IF, bfo, audio and other low frequency
stages.
I've used tubulars throughout, too, and they work fine. I am sure
Bill, at K6BW, Novato CA worked Brent, W1IA, Derry NH Coast - to - Coast AM
on 3870! Great signals both ways. Bill was using a Collins 550-A1
Broadcast Transmitter, 80 meter sloper; Brent was using a 300w class-E
homebrew transmitter, dipole antenna.
Thank you for the contact, Brent!
Happy
Hi John,
You might enjoy the following:
http://webpages.charter.net/wd4tc/photo.htm
What a beautiful transmitter!
73 de Bill, AB6MT
[EMAIL PROTECTED]
- Original Message -
From: John Lawson
To: amradio@mailman.qth.net
Sent: Sunday, December 24, 2006 9:21 PM
Subject: [AMRadio] RCA
Hi John,
You might enjoy the following:
http://webpages.charter.net/wd4tc/photo.htm
What a beautiful transmitter!
73 de Bill, AB6MT
[EMAIL PROTECTED]
- Original Message -
From: John Lawson
To: amradio@mailman.qth.net
Sent: Sunday, December 24, 2006 9:21 PM
Subject: [AMRadio] RCA
I don't have personal experience (and don't want any), but have heard horror
stories regarding the use of coaxial cable as high voltage wire.
Short answer: Don't do it!
Use fresh cable designed for the purpose. If you are willing to experiment
with a potentially lethal configuration, at least
Neon Sign HV wire also works, if you can obtain same from a neon sign
company.
73 de Bill, AB6MT
[EMAIL PROTECTED]
- Original Message -
From: A.R.S. - W5AMI
To: Discussion of AM Radio in the Amateur Service
Sent: Thursday, December 21, 2006 8:17 AM
Subject: Re: [AMRadio] HV Wire
On
- Original Message -
From: Gary Schafer
.
For all those that think that the code is a big part of being a
knowledgeable ham keep this in mind: In the past in the military electronics
schools a person that washed out of the electronics classes was sent to be
a high speed CW operator.
73
What are the objectives that lead to this motion?
73 de Bill, AB6MT
[EMAIL PROTECTED]
- Original Message -
From: WILHITE, JIM [EMAIL PROTECTED]
To: AMRadio AMRadio@mailman.qth.net
Sent: Thursday, August 15, 2002 7:24 AM
Subject: [AMRadio] Fw: A rumor about ARRL
I took the time to send
We have a substantial hobby in exploration, restoration and use of vintage
analog equipment and, IHMO, there isn't any reasonable excuse for
arbitrarily terminating this interest.
I don't know what has been discussed on other reflectors, but giving the
ARRL the benefit of the doubt, there are
Hi, Bob
I have a 6000 volt ct transformer, with a 120v tapped hi/lo primary. Should
be good for at least an amp. Weighs 53 pounds. I can send a pix if you are
interested.
Not looking for a trade, though, am trying to lighten the load around here.
I'd take $75 plus shipping.
73 de Bill, AB6MT
The simple answer is because Amateur Radio is a hobby and because some
stations want to sound very good, and the operators work very hard on their
station and they do sound very good.
PWM has great promise, but why does this design or use of big iron have any
factor in this discussion?
Why don't
Hi, Jeff
You bring up an interesting point. First of all, I am still attempting to
understand why it is absolutely necessary to provide substantial
pre-emphasis to AM audio above the broadcast band (usually a 7-12DB peak at
2.5 kHz). A microphone, transmitter and receiver, all when used
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