Menu

Line Of Sight Question

Search this Thread

Prev

Previous Post

Next Post

Next

#2

Report Post

Old

April 11th 08, 02:38 PM posted to rec.radio.amateur.antenna

John Passaneau John Passaneau is offline

John Passaneau is offline

external usenet poster

First recorded activity by RadioBanter: Jan 2007

Posts: 58

Default

Line Of Sight Question

"Robert11" wrote in news:SK-
:

Hello,

For the scanner frequencies around 118 MHz, e.g., I realize FM is
essentially line of sight.

Are AM transmissions also line of sight ?

Same question, but for the higher freq's around 800 MHz ?

Thanks,
Bob

Hi Bob

The propagation of radio signals is frequency dependent, not modulation
mode dependent. That is not to say that some modulation modes are not
better over long distances than others, SSB is better than AM and AM is
better than FM. To say that VHF frequencies are always line of sight is
also not completely correct. They are propagation modes that can extend
the range of VHF signals quite a bit. I have worked stations on 144MHz
that were more than 500 miles away. But these are not an everyday thing
so it safe to say that most of the time VHF is line of sight. 800MHz is
in the UHF band and is even more just line of sight than VHF but they are
still propagation modes that can extend the range out to 100’s of miles.
Line of sight propagation is the reason that VHF and UHF antennas are put
up high as it extends the line of sight.

John Passaneau W3JXP

Reply With Quote

Reply With Quote

Thread Tools	Search this Thread
Show Printable Version	Search this Thread: Advanced Search
Display Modes
Switch to Linear Mode Switch to Hybrid Mode Threaded Mode

Posting Rules
Smilies are On [IMG] code is On HTML code is Off Trackbacks are On Pingbacks are On Refbacks are On

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Line-Of-Sight Question	Robert11	Antenna	4	July 1st 07 06:37 PM
Line Of Sight Propagation For AM signals ?	Robert11	Shortwave	10	January 15th 07 12:49 AM
I just put pic of my lover on web sight	NO9GL	Policy	0	January 27th 06 08:21 PM
Key line question	Charlie	General	4	February 13th 05 10:11 PM
Slow Google Sight	Art Unwin KB9MZ	Antenna	9	December 3rd 03 01:20 AM

All times are GMT +1. The time now is 01:04 AM.

About Us

"It's about Radio"

Contact Us RadioBanter forum home Privacy Statement

Copyright © 2017