InterceptRadio.com Forums

The radio website that respects the Civil Air Patrol and their copyrights.
It is currently Thu May 29, 2025 6:54 pm

View unanswered posts | View active topics


Board index » General Forums » Intercept BBS

All times are UTC - 8 hours


Forums       Map Search       Database Search       Live Audio       Alerts       Wiki




Post new topic Reply to topic  Page 1 of 1
  [ 14 posts ] 
  Print view Previous topic | Next topic 
Author Message
Atomic Taco
 Post subject: Simulcast timing
PostPosted: Fri Aug 10, 2012 12:03 am 
Offline
User avatar

Joined: Thu Oct 04, 2007 1:58 pm
Posts: 3429
Location: Not in Alaska
Before GPS, how did simulcast sites keep time to stay in sync?
Top
 Profile  
 
nickcarr
 Post subject: Re: Simulcast timing
PostPosted: Fri Aug 10, 2012 1:26 am 
Offline

Joined: Mon Jan 03, 2005 1:17 am
Posts: 2643
Location: Lost on 405
computer clock? i.e. network time
Top
 Profile  
 
KB7AIL
 Post subject: Re: Simulcast timing
PostPosted: Fri Aug 10, 2012 5:14 am 
Offline

Joined: Sat May 26, 2012 9:02 am
Posts: 88
Also, our good friends, WWV, WWVH, WWVB and CHU as well as many other time standard stations...

WWV and WWVB are still my most commonly used methods of finding the correct time (as well as quite a few other things- HF propagation for one.)
Top
 Profile  
 
N7QOR
 Post subject: Re: Simulcast timing
PostPosted: Fri Aug 10, 2012 5:35 am 
Offline
User avatar

Joined: Wed Jun 09, 2004 4:15 pm
Posts: 1654
Location: Destination Unknown
It was analog, one got very good with delay boards...
Top
 Profile  
 
Wiz
 Post subject: Re: Simulcast timing
PostPosted: Fri Aug 10, 2012 5:46 am 
Offline

Joined: Thu Feb 19, 2004 8:43 pm
Posts: 59
Location: Seattle
Rubidium frequency standard.

Wiz
Top
 Profile  
 
chpalmer
 Post subject: Re: Simulcast timing
PostPosted: Fri Aug 10, 2012 6:26 am 
Offline

Joined: Tue Jul 03, 2007 8:11 pm
Posts: 2151
Location: Puget Sound
High stability oscillators, a tuning tool and the ability to hear the other site as you tuned.

Having all the crystals made from the same stock at the same time helped with getting them to age together and usually drift the same direction.

Good stable power supply to the site.

Site delay- we used Allen Avionics delay boards.

_________________
"A well regulated breakfast, being necessary to the healthy start of the day, the right of the people to keep and eat food shall not be infringed."
Top
 Profile  
 
jrw14493
 Post subject: Re: Simulcast timing
PostPosted: Fri Aug 10, 2012 10:28 am 
Offline
Bringer of Light
User avatar

Joined: Mon Jun 27, 2005 5:22 pm
Posts: 1573
Location: Depends on the day of the week
Remember those old cat clocks with the waving tail and eyes that moved back and forth? Those were installed in mountain top sites and as the tail moved back and forth it would hit the side of the repeater cabinet and set the timing of the clock.

_________________
Interoperability is an attitude, not a technology.
Top
 Profile  
 
Atomic Taco
 Post subject: Re: Simulcast timing
PostPosted: Fri Aug 10, 2012 10:31 am 
Offline
User avatar

Joined: Thu Oct 04, 2007 1:58 pm
Posts: 3429
Location: Not in Alaska
jrw14493 wrote:
Remember those old cat clocks with the waving tail and eyes that moved back and forth? Those were installed in mountain top sites and as the tail moved back and forth it would hit the side of the repeater cabinet and set the timing of the clock.
Image Atomic Taco likes this
Top
 Profile  
 
the Outlaw
 Post subject: Re: Simulcast timing
PostPosted: Fri Aug 10, 2012 11:58 am 
Offline
Corporal Cowboy
User avatar

Joined: Thu Feb 19, 2004 4:45 pm
Posts: 3556
Location: Stensgar, SE of
I'm quite sure it was some sort of voodoo magic.

_________________
</>
Top
 Profile  
 
Wilrobnson
 Post subject: Re: Simulcast timing
PostPosted: Fri Aug 10, 2012 1:59 pm 
Offline
Mr. Bad Example
User avatar

Joined: Sat Feb 21, 2004 10:11 am
Posts: 8080
Location: Nancy's Bedroom... ooh aah
Gerbil Voodoo.

_________________
President-in-Exile, Seattle Area Radio Communications And Scanner Traffic Intercept Crew (SARCASTIC)
Don't feel bad if you can't use your STD100/200; there are still people using Digital Frequency Search!
Bunnery definition for the under-fives
Top
 Profile  
 
Jim
 Post subject: Re: Simulcast timing
PostPosted: Fri Aug 10, 2012 3:22 pm 
Offline
Angus Cheeseburger
User avatar

Joined: Thu Feb 19, 2004 5:09 pm
Posts: 4759
Location: CN88st
Wilrobnson wrote:
Gerbil Voodoo.

Richard Gere knows but won't tell. :lol:

_________________
" SILENCE IS CONSENT "

Made to Government Specs:
1) Measured with a micrometer.
2) Marked with a chalk.
3) Cut with an axe.

Jim N7UAP - Bellingham, WA / InterceptRadio.com
Top
 Profile  
 
chpalmer
 Post subject: Re: Simulcast timing
PostPosted: Fri Aug 10, 2012 9:10 pm 
Offline

Joined: Tue Jul 03, 2007 8:11 pm
Posts: 2151
Location: Puget Sound
Nah just Ed! http://www.simulcastsolutions.com/

_________________
"A well regulated breakfast, being necessary to the healthy start of the day, the right of the people to keep and eat food shall not be infringed."
Top
 Profile  
 
KE7JFF
 Post subject: Re: Simulcast timing
PostPosted: Sat Aug 11, 2012 4:00 pm 
Offline

Joined: Fri Jun 01, 2007 7:46 pm
Posts: 777
Location: Portland, OR
Western Union clocks!

_________________
Mt Wave SAR member
Support Search & Rescue: Get Lost!
http://www.mwave.org
Top
 Profile  
 
Ken
 Post subject: Re: Simulcast timing
PostPosted: Mon Aug 13, 2012 12:08 pm 
Offline

Joined: Thu Jul 19, 2007 12:45 am
Posts: 196
Location: I'm hiding in Honduras -I'm a desperate man -Send lawyers, guns & money The shit has hit the fan
And magnets... lots of magnets.... with saltwater..

_________________
Respond on Tac 3
Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  Page 1 of 1
  [ 14 posts ] 

Board index » General Forums » Intercept BBS

All times are UTC - 8 hours


Who is online

Users browsing this forum: Google [Bot] and 3 guests

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by electricity. Copyright © 2013 Interceptradio.com