[ARC5] 453 on broadcast band
Paddy Ryan
pei7cn at eircom.net
Tue Jan 21 13:51:31 EST 2014
some of the 453s were ''broadcasted'' by altering the coils..I have one here
that is broadcasted but the dial is still the 453..a bit confusing..it was
broadcasted before it came to me,hi! 73 de Pat/EI7CN
-----Original Message-----
From: arc5-request at mailman.qth.net
Sent: Tuesday, January 21, 2014 3:29 PM
To: arc5 at mailman.qth.net
Subject: ARC5 Digest, Vol 120, Issue 44
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Today's Topics:
1. Re: LOL Get Your "Air Traffic Control" Spares Box!
(Christopher Bowne)
2. Re: Looking at a 70 year old BC-457 (Leslie Smith)
3. Re: Attention K Mart Shoppers (Robert Eleazer)
4. Broadcast or beacon? (Jay Coward)
5. Re: Broadcast or beacon? (Mike Hanz)
6. Re: Broadcast or beacon? (arc5 at ix.netcom.com)
7. Re: Broadcast or beacon? (David Edsall)
----------------------------------------------------------------------
Message: 1
Date: Mon, 20 Jan 2014 15:51:09 -0800 (PST)
From: Christopher Bowne <aj1g at sbcglobal.net>
To: "jeepp at comcast.net" <jeepp at comcast.net>, "arc5 at mailman.qth.net"
<arc5 at mailman.qth.net>
Subject: Re: [ARC5] LOL Get Your "Air Traffic Control" Spares Box!
Message-ID:
<1390261869.63567.YahooMailNeo at web185004.mail.gq1.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1
Yeah every ATC/ART-13 came equipped with a 110VAC surge supressor plug...or
whatever that plug looking thing is with the ventilated tubular cage on
it..must of been from the estate of a ham who was using it as a box for
various junk box items..the box itself is interesting, but possibly none of
its contents are the original stuff.
________________________________
From: D. Platt <jeepp at comcast.net>
To: arc5 at mailman.qth.net
Sent: Monday, January 20, 2014 1:30 PM
Subject: Re: [ARC5] LOL Get Your "Air Traffic Control" Spares Box!
On 1/20/2014 8:30 AM, David Stinson wrote:
> ATC surely must mean "Air Traffic Control," right? ;-)
>
> http://www.ebay.com/itm/360535878707
Heh heh heh..... Well, at least he's in the right sphere of influence?? The
best wrong-translation I recall is a 1980's-era Washington Post article,
vis-a-vis a local plane crash.? The reporter stated that at the time of the
incident, the pilot was flying VOR.. Visibility Obscured by Rain.? Oh
well...
Jeep K3HVG
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Message: 2
Date: Tue, 21 Jan 2014 11:44:49 +1100
From: Leslie Smith <vk2bcu at operamail.com>
To: "ARC-5 List" <arc5 at mailman.qth.net>
Subject: Re: [ARC5] Looking at a 70 year old BC-457
Message-ID:
<1390265089.23824.73245821.271B3AC3 at webmail.messagingengine.com>
Content-Type: text/plain
Hello Bob,
Your posting is one of the most informative posting I've read for some
time.
I have a graph I plotted of measured frequency (from a BC-221) and
I'll post that on the ARC5-radio files section as a result of your
work here.
In summary I can say the drift I measured in "my" BC-221 was (in the
order of) 160Hz per degree C at "around" 4 MHz.
Returning to "these 70 year old critters" I spent yesterday evening
working an a solid state version of a crystal controlled converter -
Like McCoy's - to put in front of an R-23.
Many believe that the age of home-brewing electronics is gone. I
believe THIS is the golden age for home-brewers. Quality test gear
never was so readily available.
Transistors and solid state devices are easy to build.
They eliminate the need for chassis punches and heater wiring. 12
(or 24v) is much easier to work with than 250V DC.
The only missing ingredient is knowledge. THAT is what makes
home-brew difficult.
So - thank you for posting these figures.
I will post my figure for BC-221 stability within a few days, as I
said a moment earlier.
73 de Les Smith
vk2bcu at operamail.com
On Tue, Jan 21, 2014, at 6:57, MillerKE6F at aol.com wrote:
> With the continued interest in these critters I thought it might be of
> some
> interest to see how well this rascal was holding up after almost 70
> years,
> most of which was spent sitting on my shelf. This unit had not seen too
> many modifications those being the filaments rewired for 12 volts, a
> final
> amp key jack installed, the eye tube circuit disconnected. Otherwise no
> other changes. The frequency range remained in the 4-5.3 MHz category.
> My
> measurements were made at a nominal 3.950000 MHz. The first performance
> parameter to come to mind was how stable was the VFO. I used a regulated
> 12
> vdc power supply for the filaments and a regulated 200 vdc for the
> oscillator
> plates. No final 1625s were installed during these tests. Frequency
> measurements were made with an HP 5340A frequency counter with an
> external
> rubidium standard. I should mentioned that the VFO remained operational
> on
> Plate Voltages as low as 12VDC although the output level was marginal.
>
> Short term stability did not seem too much affected by the plate voltage
> be
> it 12VDC, 100 VDC or 200 VDC. The remainder of the frequency stability
> was done with a regulated 200 VDC source.
>
> 1. Drift (Downward) over a 14 hour overnight period was 1359 Hz with an
> ambient temperature range (rough measurements) from 58 degree F down to
> 42
> degrees F.
>
> 2. Short term drift over 30 minutes (58 degrees F) 4 Hz
>
> 3. Variation with plate voltage 150 VDC Ep shift upward 190 Hz (from
> 200
> vdc Ep reference)
>
> 4. Variation with plate voltage 100 VDC Ep shit upward 442 Hz (from
> 200
> vdc Ep reference)
>
> 5. Filament voltage lowered to 10VDC Ep 200 VDC (10 minutes to soak up
> change) 56 Hz drift downward
>
> 6. Filament voltage raised to 14VDC Ep 200 VDC (10 minutes to soak up
> the
> change) 11 Hz drift upward
>
> Conclusions at this point in the adventure are that the VFO section is
> not
> affected all that much by operating parameters such as plate voltage or
> filament voltage. Temperature seems to be the major player and when the
> unit
> is fully operational with final tubes in place (Big Heat Source being
> located next to the VFO can) I will rerun the stability tests.
>
> I will be running the transmitter on a home brew power supply that
> duplicates the dynamotor voltage employed in the original scheme. The
> Filament
> string will be returned to Nominal 24 vdc and powered from a regulated
> DC
> module in the AC power supply. I hope to substantiate (for my own
> edification) just how practical it is to use these units as built and
> also look into
> a number of the modifications that were made to these units over the
> years
> to include keying and final amplifier tweaks. Also spectrum analysis of
> the output signals when feeding typical 50 ohm loads and methods used to
> match
> these loads. I have a fairly large collection of "Modified Units" which
> I
> can modify further to check the viability of TVI modifications, Buffer
> amplifiers to mitigate chirp and pulling and other sane changes that
> might
> enhance these gems from the past. I also have a number original units
> both
> 274/N and ARC-5 to test and evaluate. I realize that this is ground
> that's
> been plowed many times, but I'm not convinced that these units are ready
> to
> put on the shelf as ornaments of a bygone era. I'm driven by my
> memories
> of using these rascals some 50 years ago. Then more out of necessity
> being
> a cash strapped kid. I would also be interested to read the findings of
> other folks who have wrenched on these transmitters along with their
> findings
> 73
>
> Bob, KE6F
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------------------------------
Message: 3
Date: Tue, 21 Jan 2014 07:36:20 -0500
From: "Robert Eleazer" <releazer at earthlink.net>
To: <arc5 at mailman.qth.net>
Subject: Re: [ARC5] Attention K Mart Shoppers
Message-ID: <001801cf16a5$6666c5e0$8550c58e at DH26DQ31>
Content-Type: text/plain; charset="iso-8859-1"
"That appears to be the ARC-3 model baseplate to me."
Nope, I have an ARC-3 receiver dynamotor right here and it is just like a
274-N except about 25% larger all round. The one in the junk for sale has a
raised base like the SCR-283 or some of the postwar sets.
Wayne
------------------------------
Message: 4
Date: Tue, 21 Jan 2014 09:43:33 -0500 (EST)
From: Jay Coward <jcoward5452 at aol.com>
To: arc5 at mailman.qth.net
Subject: [ARC5] Broadcast or beacon?
Message-ID: <8D0E4CE4AD6A66A-F70-166B at webmail-d252.sysops.aol.com>
Content-Type: text/plain; charset="us-ascii"
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=141170755933
Dial is broadcast, tag is BC-453.
?
Jay
------------------------------
Message: 5
Date: Tue, 21 Jan 2014 10:05:40 -0500
From: Mike Hanz <aaf-radio-1 at aafradio.org>
To: arc5 at mailman.qth.net
Subject: Re: [ARC5] Broadcast or beacon?
Message-ID: <52DE8CC4.7030300 at aafradio.org>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Yes, it is. :-)
On 1/21/2014 9:43 AM, Jay Coward wrote:
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=141170755933
>
> Dial is broadcast, tag is BC-453.
> ?
> Jay
------------------------------
Message: 6
Date: Tue, 21 Jan 2014 15:26:59 +0000
From: "arc5 at ix.netcom.com" <arc5 at ix.netcom.com>
To: <arc5 at mailman.qth.net>,"Mike Hanz" <aaf-radio-1 at aafradio.org>
Subject: Re: [ARC5] Broadcast or beacon?
Message-ID: <20140121152659.A533647F037 at attemconn01.jsv.hosting.ops>
Content-Type: TEXT/PLAIN; charset=UTF-8
Frankinradio
------Original Message------
From: Mike Hanz <aaf-radio-1 at aafradio.org>
To: <arc5 at mailman.qth.net>,"Mike Hanz" <aaf-radio-1 at aafradio.org>
Date: Tuesday, January 21, 2014 10:05:40 AM GMT-5
Subject: Re: [ARC5] Broadcast or beacon?
Yes, it is. :-)
On 1/21/2014 9:43 AM, Jay Coward wrote:
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=141170755933
>
> Dial is broadcast, tag is BC-453.
> ?
> Jay
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Message: 7
Date: Tue, 21 Jan 2014 10:29:10 -0500
From: "David Edsall" <dedsall at myfairpoint.net>
To: <arc5 at mailman.qth.net>
Subject: Re: [ARC5] Broadcast or beacon?
Message-ID: <C4D9B250C6B24B35852723626D9D5CD2 at DavidEdsallPC>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=response
Write and ask.
K1ANX is knowledgeable and honest.
David W1TDD
-----Original Message-----
From: Mike Hanz
Sent: Tuesday, January 21, 2014 10:05 AM
To: arc5 at mailman.qth.net
Subject: Re: [ARC5] Broadcast or beacon?
Yes, it is. :-)
On 1/21/2014 9:43 AM, Jay Coward wrote:
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=141170755933
>
> Dial is broadcast, tag is BC-453.
> ?
> Jay
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