The positive voltage one end, negative on the other, trick has been around since at least the early days of Trans-Atlantic cables. The repeaters are in series...
18938
Tom
radargeek247
Mar 2, 2011 9:43 pm
John- In 1997 a friend from Copper Harbor (MI) asked me if I'd help him in tracing down a 'snowy picture' in their tiny municipally-owned CATV system, which at...
18937
Tom Scanlan
radargeek247
Mar 2, 2011 9:38 pm
Joe- Outstanding and very complete! Thanks, Joe! Tom S ... From: arkyjoe123 <arkyjoe123@...> To: coldwarcomms@yahoogroups.com Sent: Wed, Mar 2, 2011...
18936
John K Scoggin Jr (W3...
jks19714
Mar 2, 2011 7:46 pm
IIRC, even T-1 circuits had + and/or - 130VDC on the pairs for repeater power. Imagine my surprise when I discovered that fact while leaning into (and against)...
18935
arkyjoe123
Mar 2, 2011 7:40 pm
HI Tom, Since way back when, through the 50's, telephone cables used paper insulation on the wires. Paper has great dielectric characteristics - as long as it...
18934
Tom
radargeek247
Mar 2, 2011 5:21 pm
Blake- Very much appreciated - thanks for post! A couple years ago at a MacDill AFB (Tampa, FL) Open House the Commando Solo folks deployed one of their...
18933
ozob99
Mar 2, 2011 5:10 pm
... I have found that many doc's on various pay to download sites can be found free elsewhere, especially gov't stuff; search title+author(if stated)+pdf(or...
18932
Patrick Chicas
pjcnlv
Mar 2, 2011 5:02 pm
Thanks for the posts and links. ... [Non-text portions of this message have been removed]...
18931
Tom
radargeek247
Mar 2, 2011 4:25 pm
My familiarity with long lines has been mostly with microwave - TD2, local loops, etc., mostly as they relate to TV signal carriage. Recent discussions on...
18930
Jim Conrad
jimcnrd
Mar 2, 2011 4:20 pm
Document can be downloaded from here without having to register/pay a fee; http://airforcemedicine.afms.mil/idc/groups/public/documents/afms/ctb_076786.pdf ......
18929
ozob99
Mar 2, 2011 3:25 pm
This document lists the nomenclature,power & frequencies in this PsyOps aircraft; I'd guess same or similar gear in the previous Cold War versions. ...
18928
arkyjoe123
Mar 2, 2011 5:18 am
One of the L-3 cables out of Jacksonville, FL ran at high enough voltage that it was pressurized with Sulfur Hexaflouride gas to prevent arc over. There were...
18927
David
wb8foz@...
Mar 2, 2011 5:00 am
... I had not considered that aspect; and it would add a large burden to any such design. They were very sure of their design, and so pushed each leg to the...
18926
David
wb8foz@...
Mar 2, 2011 4:34 am
... Not very much diversity, when you think of things like <http://www.ntsb.gov/Dockets/PipeLine/DCA10MP008/450413.pdf>...
18925
charlie Fargis
ucfargis1
Mar 2, 2011 3:57 am
I worked in Engineering for this region and know more we cant talk about Those cables would have to be 50 feet or more apart for diversity and share no common...
18924
Paul Zawada
paul_zawada
Mar 2, 2011 3:09 am
... Here's a link to the location of the Winamac underground. It's actually closer to the small town of Pulaski: ...
18923
ajbtelecom
Mar 2, 2011 2:17 am
... Can anyone shed any belated light on this? I just looked at them, and Jack was certainly not exaggerating - they don't look *anything* like the older...
18922
Mike Walker
thiscloudboy
Mar 2, 2011 2:10 am
I found tis article very interesting: http://www.slate.com/id/2286735/ While it's focused on one man and the concern over authenicating a president's nuclear...
18921
Albert LaFrance
albert_lafrance
Mar 2, 2011 2:03 am
I believe Charlottesville 2 and Leesburg 5 have been in operation continuously, and were renovated post-9/11. Hagerstown 2 had been mothballed but was...
18920
Mike Walker
thiscloudboy
Mar 2, 2011 1:37 am
Please ask your friend if he can say anything further about Big Hole—I've always found that site and the Project Offices in general really fascinatin, in...
18919
wb2vsj
Mar 2, 2011 1:12 am
Jack, A friend of mine's father used to work there (70's/80's I think he said.) About 2-3 years ago they received some sort of special invite for former...
18918
Pj
packy41
Mar 2, 2011 12:36 am
I was last up there in 2008 and have a walkaround of the facility. I actually may be up there tomorrow on my way west from LV. Depending on time and weather......
18917
cpe122
Mar 2, 2011 12:30 am
... I've studied some of the L's fairly closely; including the specific mileage between L-4 main/power feed stations. Long Lines was pretty particular about...
18916
cpe122
Mar 1, 2011 10:55 pm
I don't think that's what Albert meant to suggest; the maps definately suggest that there were two distinct cables (not so say they couldn't have shared the...
18915
Craig Scott
dredmlm
Mar 1, 2011 7:35 pm
Some pix of the Notch under construction. http://www.westoveryesterday.com/TheNotch.html some other interesting info there also, including Jimmy Stewart making...
18914
John Young
johny8766
Mar 1, 2011 4:20 pm
As usual, The Central Office website has an entry: http://www.thecentraloffice.com/Microwave/SCMW3.htm Turquoise Type: Junction/Switched Location: Atop...
18913
John Young
johny8766
Mar 1, 2011 4:15 pm
Thanks for the reference. A series of photos of the apparatus at the top of Turquoise Mountain. Click the small photos for blow-ups: ...
18912
Patrick Chicas
pjcnlv
Mar 1, 2011 3:13 pm
Hello All, As an intro, I am a career telecom entrepreneur. I started my career in 1979 as a PBX I&R tech with Pacific Bell in SoCal. I moved to Special...
18911
ozob99
Mar 1, 2011 1:38 pm
... Also Arlington 2 & Wash 3....
18910
charlie Fargis
ucfargis1
Mar 1, 2011 12:42 pm
I have doubts but not precise knowledge. A common repeater hut for Mosely and Faulkner would remove diversity. And in and around DC area, diversity is almost...
