[BC] 111C repeat coils/Eqaualized circuits

[Dana Puopolo]

Yep.
They use APT for their perceptual coding algorithim.
How do YOU spell "dueling codecs"?

-D

------ Original Message ------
Received: Sat, 07 Apr 2007 08:32:11 AM EDT
From: "Charles Wooten NF4A" <nf4a at knology.net>
To: "'Broadcasters' Mailing List'" <broadcast at radiolists.net>
Subject: [BC] 111C repeat coils/Eqaualized circuits

Telco (at least in this part of the country) does not sell traditional
equalized program circuits anymore....they have been replaced by "nailed"
digital circuits with telco-furnished codecs on each end of the
circuit....The main manufacturer of these codecs is Pulsecom (they make the
PCAU telco-program codec)....these circuits are easy to install and maintain
since they use traditional telco data circuits and any installer/repairman
can work on them....I remember in our city, there was only one or two guys
who knew anything about the old equalized program circuits. By the way Jeff,
these Pulsecom PCAUs will run in "campus" (no central office equipment
needed)mode for the copper loop length you have.


Charlie

-----Original Message-----
From: broadcast-bounces at radiolists.net
[mailto:broadcast-bounces at radiolists.net] On Behalf Of Xmitters at aol.com
Sent: Friday, April 06, 2007 10:59 PM
To: broadcast at radiolists.net
Subject: [BC] Re:111C repeat coils


In a message dated 4/6/07 11:39:29 AM Central Daylight Time, 
broadcast-request at radiolists.net writes:

<< The telco 111-C "repeat coils" are available on the surplus market. They
are
 probably the finest audio-frequency transformers --ever. They have four
shield
ed coils and the core is a toriod made of mu-metal strip. Very impressive
for s
omething designed in the 1920s. The companion shunt equalizers are also
availab
le although I don't remember the number. They consist of a tapped inductor
and 
tapped series resistors. Basically, you shunt-out >>

OK, here is a dumb question. If telco copper loops are still around and 111C

and equalizers are not considered Old Fart Engineering (see  my previous 
post/coinage of term) then why are there not companies still making the
111C?  
As 
ROTL, et. al.  pointed out, Jenesn makes some nice transformers. It appears 
that the choice is either Jensen or surplus 111C. To me,  it is odd if
equalize
d 
copper is still not antique technology today, that 111C type performance
could 
not be had without resorting to the surplus market. Seems like you could 
outfit a specialty plant in China with some knowledgeable technicians, and
you 
could turn out high quality affordable product. A new 111C made in the
states 
would likely cost $500.00 I would guess. Just wondering.

The last I looked, the companion repeat coil card for the other end of a Tel

Labs 4008 equalized circuit, was a bit anemic at the low end as well as
anemic 
in the head room department. 

I'm sure that there are others out there besides me, that have restrictions 
about buying used stuff. What I do is, if used product is the only
alternative,
 
I pay for it myself, then donate it to the station. I can only do that if
the 
item costs but a few bucks. 


Jeff Glass
Northern Illinois University

Dell CPi-D266 Win98SE AOL 5.0
**************************************
 See 
what's free at http://www.aol.com.
_______________________________________________

The BROADCAST [BC] list is sponsored by SystemsStore On-Line Sales
Cable-Connectors-Blocks-Racks-Wire Management-Test Gear-Tools and More! 
www.SystemsStore.com       Tel: 407-656-3719    Sales at SystemsStore.com




_______________________________________________

The BROADCAST [BC] list is sponsored by SystemsStore On-Line Sales
Cable-Connectors-Blocks-Racks-Wire Management-Test Gear-Tools and More! 
www.SystemsStore.com       Tel: 407-656-3719    Sales at SystemsStore.com