Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1   Report Post  
Old December 11th 15, 06:19 PM posted to rec.radio.broadcasting
external usenet poster
 
First recorded activity by RadioBanter: Mar 2015
Posts: 2
Default AM Tuning steps (9 vs. 10khz)

On Wednesday, January 22, 2003 at 9:45:02 AM UTC+11, Mel3k wrote:
I'm not sure if this has been asked before, but why does AM radio in
Europe/Asia tune in 9khz steps while North American AM goes by steps
of 10khz? Also, why did some countries like Australia switch from
10khz to 9khz steps some years back?

Thanks for your insights


If you go back to the history of AM radio, the entire world was using 10 kH
z on AM, which was back in the days when the radios did not have digital di
splays on them. It was one of those old radios in which you had to fiddle w
ith the dial to find a particular station. In those days it was necessary b
ecause it required a much wider spacing. When they started making radios wi
th digital displays on them, that was when Australia, New Zealand, Asia, Af
rica and Europe began the switch-over to 9 kHz spacing. The purpose of swit
ching to 9 kHz on AM was to accommodate more stations in. For some reason N
orth, Central and South America was still stuck with 10 kHz, and I believe
it's because although they started making radios with digital displays, the
frequencies are still based on the old radios which had the tuning dial. P
robably another reason is because there were already too many stations on t
he AM band that it was not convenient to narrow the bandwidth from 10 kHz t
o 9 kHz. Plus back in the early 80's they had plans to switch to 9 kHz like
the rest of the world, but the changeover never really worked. These days
there are some American radios which allow you to switch between 9 kHz and
10 kHz simultaneously, in the likely event that the Americas made the trans
ition to 9 kHz spacing. I hope that answers your question.


Reply
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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
AM Tuning steps (9 vs. 10khz) [email protected] Broadcasting 2 January 9th 19 10:53 PM
Odd request:MW 9KHz and 10KHz channel listings [email protected] Shortwave 6 September 8th 07 11:50 PM
FS Icom PCR-1000 Scanner/Receiver Computer Control 10KHz-1300MHzLow Serial Number mike Equipment 0 March 15th 07 10:28 PM
Sony ICF-M410V: 9/10kHz switch and AM reception... Alexa Shortwave 1 June 9th 04 05:26 PM
BFO for 465kHz +/- 10kHz Frank Dresser Shortwave 2 July 30th 03 05:23 AM


All times are GMT +1. The time now is 07:47 AM.

Powered by vBulletin® Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Copyright 2004-2019 RadioBanter.
The comments are property of their posters.
 

About Us

"It's about Radio"

 

Copyright © 2017