Halligan's Hallicrafters International

    Halligan's Hallicrafters International
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From: "Shirli Sieb" <sieb@sympatico.ca>
Date: Wed, 5 Dec 2001 15:56:52 -0500
Subject: [AMRadio] Radio
Message-ID: <LOBBJHOLOOHLIPLONIAFOEKNEJAA.sieb@sympatico.ca>


http://www.amfone.net - Home of the AM Radio List.

To post or see items for sale or wanted, go to the new AM'ers Trading post below.
http://www.amfone.net/cgi-bin/ikonboard/ikonboard.cgi

CBC RADIO'S TUNING THE WORLD

Tuning the World is a lively celebration of the power of radio and its
significance to humankind. Radio continues to shape
humanity's understanding of itself 100 years after Guglielmo Marconi's first
transatlantic wireless transmission from Cornwall, England to Signal Hill in
St. John's, Newfoundland.

This was the event that made the world realize that a new communications
medium had been born. CBC Radio's
celebrations begin with special programming in the weeks leading up to the
anniversary on Wednesday, December 12. On that day, both CBC Radio One and
CBC Radio Two will celebrate Marconi's incredible feat by both reflecting on
radio's past
and looking to its future in the new millennium.

As part of the celebrations, CBC Radio 3 brings you the Marconi Global
Sampler: an interactive sound and visual mixer. A world only imagined 100
years ago, now at your fingertips.

The site also contains a complete list of Tuning the World programming,
which begins November 30 on CBC Radio One
and CBC Radio Two. For more information, visit the Tuning the World web site
at
www.tuningtheworld.com .


Regards, Josie Buiza,
Communications New Media CBC.ca
(http://www.cbc.ca/) Toronto, Canada


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From: jcandela@prodigy.net
Date: Wed, 05 Dec 2001 13:10:09 -0500
Subject: RE: [AMRadio] Cylindrical 811A's needed
Message-Id: <AA-0C054371D26B1E86F44080AE62E61EBE-ZZ@homebase1.prodigy.net>


http://www.amfone.net - Home of the AM Radio List.

To post or see items for sale or wanted, go to the new AM'ers Trading post below.
http://www.amfone.net/cgi-bin/ikonboard/ikonboard.cgi

Brad,

   I used to run a PP 8005 rig. I eventually ran out 
of them. seems like these tubes have finicky 
filaments. Some would glow nice and bright, and have 
little, or no emission. Others would work for a few 
hours, and then lose emission. Attempts at 
rejuvenation were less then successful.
   This lead me down the road of other tubes, and 
higher power levels using TVL coils. At first I tried 
572B's, and optimized the bias, filament V, etc. for 
this tube. Wow, could run an easy kilowatt input. The 
plate modulated performance was not good however. The 
8005's modulated much better. I had a modulator 
capable of 600 watts, so that was not the problem.

   I later changed over to 805's with a kluged socket 
adapter. Turns out that two 805's will run all day 
long at 1 Kw DC input (2500V X .4A), and put out 850 
watts of carrier. They also would modulate upward nice 
like the 8005. This was a win -win because the 805 was 
happy, would modulate well, and the filaments were not 
finicky. I ran the same pair for several years. I was 
between wives at the time so I yakked on 3880 quite a 
bit (circa 1983-6). The max plate voltage for a 805 is 
1500 volts CCS. I ran them at 2500 ICAS Plate 
modulated class C push pull. I kept the plate current 
& dissipation within spec, and let er rip. Tubes took 
it. 

    The bad news. The 805 has higher interelectrode 
capacitance, is not a good tube beyond 20 meters. 
Also, I sent my lot of 805's (six of them) to Ozona 
Bob, w5pyt. I wonder where they ended up.


    Brad, you might try the 808. Use 4 in push pull 
parallel at 2500 volts. That is what I did for my 600 
watt modulator. Nice stable tube that runs for years 
without complaining.

Regards,
Jim

WD5JKO

--- Original Message ---
From: Brett Gazdzinski <brett.gazdzinski@wcom.com>
To: "'AM Reflector'" <amradio@qth.net>
Subject: RE: [AMRadio] Cylindrical 811A's needed

>http://www.amfone.net - Home of the AM Radio List.
>
>To post or see items for sale or wanted, go to the 
new AM'ers Trading post below.
>http://www.amfone.net/cgi-bin/ikonboard/ikonboard.cgi
>
>Speaking of tubes,
>I have a lot of good 4-125, 4-250, and 4-400 tubes, 
and
>would like to trade for some good 8005,s and or 
V70d,s.
>
>I used to have the 4-XXX tubes for the 30k1, but 
since I
>sold that, I don't need them.
>
>I also have a monster plate tuning cap...10,000 volts 
or more,
>and a monster loading cap...these parts would love
>being hooked up with a 4-400 or two at the 2500 to 
3000 volt
>level....
>
>Since I have found the push pull rig works so well 
with
>812a,s, I would like to bump the carrier power up a 
little.
>The 8005 has a bit more plate dissipation I think, as 
does the
>V70d.
> 
>Lets trade!
>
>Brett
>N2DTS
>
>______________________________________________________
>
>To leave AMRadio , send mailto:majordomo@qth.net
>with the BODY of the message containing:
>
>unsubscribe amradio



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From: "John Coleman" <jec@pctechref.com>
Date: Wed, 5 Dec 2001 11:08:31 -0600
Subject: [AMRadio] Narrow Band FM
Message-ID: <000401c17daf$778a84c0$0200a8c0@WinProxy>


http://www.amfone.net - Home of the AM Radio List.

To post or see items for sale or wanted, go to the new AM'ers Trading post below.
http://www.amfone.net/cgi-bin/ikonboard/ikonboard.cgi


The following is message was forwarded to me from Jeff W5OMR and it
originated on the AM Window BBS.  I am curious about NBFM on the lower HF,
but I suspect there is a lot of draw backs.  It is my understanding that
even with Phase modulation there are products of the modulation which
produce sidebands at multiples of the modulating frequency and reducing the
bandwidth will indeed reduce the higher frequency intelligibility.  Also I
have heard that selective fade and Doppler shift caused by movement of the
ionosphere degrades reception as much or more that noise.

I am curious if others have any experience and knowledge on this that they
might be able to share.

73
WA5BXO, John

*********Original Message*****************

The manual says:

With an external exciter the T-368 can broadcast narrow-band FM.

Anyone ever try this?

What exciter is used, or is typical for this mode?

Then we have to have the appropriate grey receiver to go with it.

Joe KG2CI


: : is FM allowed on 75mtrs?

: Narrowband FM is certainly allowed on 75 meters, as well as on 160,
40, and all other bands where we AM'ers like to hang out. I would
love to try some FM tests, running my 20V at full carrier power
output (up to 1100 watts), substituting an FM exciter for the
oscillator and disabling the AM modulator.
: It would be even more interesting to try a test that was tried by
WQYK in Florida some years ago. They ran sliver-band FM (+/- 1 kc
deviation), using an FM broadcast exciter running at 101.0 Mc and
using a prescaler to divide by 100 to arrive at WQYK's frequency of
1010 kc. They had a receiver which could upconvert the received
: mediumwave FM signal and multiply it in the IF to reconstitute the
+/- 75 kc deviation. Although WQYK still superimposed some AM (which
would be illegal in amateur radio) to ensure compatibility with
regular AM receivers, I would love to try this with pure FM on 1885
or 1890 kc. Does anyone have any ideas about the special FM receiver
that the WQYK engineers used for their test?
: It might be worth a try; it could eliminate the noise on 75 and 160
meters, it would allow us to run a full 1500 watts of carrier, it
would eliminate the audio rectification type of RFI, and, if we could
expand the narrow FM signal in the receiver, we should be able to
obtain BETTER fidelity than we currently get with AM.

: Any takers?

: Phil K2PG






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This page last updated 18 Jul 2001.