Videokarma.org

Go Back   Videokarma.org TV - Video - Vintage Television & Radio Forums > Television Broadcast Theory

We appreciate your help

in keeping this site going.
Reply
 
Thread Tools Display Modes
  #31  
Old 04-30-2021, 03:54 PM
DavGoodlin's Avatar
DavGoodlin DavGoodlin is offline
Motorola Minion
 
Join Date: Aug 2011
Location: near Strasburg PA
Posts: 3,400
Quote:
Originally Posted by nasadowsk View Post
As n aside, in the NTSC days, was UHF ever NOT finicky? I don't ever recall being able to get UHF decently..
I can answer this one as a DX'er, NO - As a supplement to fill in areas not able to have a VHF local channel, UHF was always meant for a 40 mile radius using a common roof antenna.

If you were clear up to 100 miles away or stuck in the woods 50 miles away, the Channel Master Parascope (4251) was the antenna you needed, to get any stable UHF and almost always with antenna-mounted preamplifiers.

At least analog was giving us clues if it was multipath OR weak signal screwing with finicky UHF
__________________
"When resistors increase in value, they're worthless"
-Dave G
Reply With Quote
  #32  
Old 04-30-2021, 05:05 PM
pgnl pgnl is offline
VideoKarma Member
 
Join Date: Jul 2016
Location: West Midlands, UK
Posts: 17
Quote:
Originally Posted by DavGoodlin View Post
I can answer this one as a DX'er, NO - As a supplement to fill in areas not able to have a VHF local channel, UHF was always meant for a 40 mile radius using a common roof antenna.

If you were clear up to 100 miles away or stuck in the woods 50 miles away, the Channel Master Parascope (4251) was the antenna you needed, to get any stable UHF and almost always with antenna-mounted preamplifiers.

At least analog was giving us clues if it was multipath OR weak signal screwing with finicky UHF
I just searched for that and have never seen anything quite like it in the UK. I suspect you would have needed planning permission from your local council to use it! its massive….

The UK has been UHF only since Colour TV started in 1969 (vhf was 405 line b&w ended 1985). When we had analogue TV the main transmitters power was usually 1000kw per channel - any type of aerial/antenna for 100 miles even with a mast top amp sounds like a stretch here… i am sure others will correct me though…
Reply With Quote
  #33  
Old 04-30-2021, 05:09 PM
old_tv_nut's Avatar
old_tv_nut old_tv_nut is offline
See yourself on Color TV!
 
Join Date: Jul 2004
Location: Rancho Sahuarita
Posts: 7,184
Quote:
Originally Posted by DavGoodlin View Post
At least analog was giving us clues if it was multipath OR weak signal screwing with finicky UHF
RCA even put out a ghost ruler that you could hold up against the screen to estimate the delay and difference in path length, to take a guess at what object was causing the ghost.

In studying the ghost conditions for digital, we had special receivers that could plot the ghost signals from the equalizer taps. Then you could draw an ellipse on a map representing all locations that would produce that delay. This is how we discovered that the Golden Gate Bridge in San Francisco caused trouble in certain locations that had a simultaneous clear view of it and the transmitter.



__________________
www.bretl.com
Old TV literature, New York World's Fair, and other miscellany
Reply With Quote
  #34  
Old 05-02-2021, 05:52 PM
centralradio centralradio is offline
VideoKarma Member
 
Join Date: Feb 2014
Posts: 1,097
Update .One transmitter is only 15- 20 miles from here.. Its still rubbish here.Crank up their power.Maybe it will reach me..
Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 10:15 AM.



Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
©Copyright 2012 VideoKarma.org, All rights reserved.