HFU HF Underground

General Category => Huh? => Topic started by: ThaDood on September 20, 2025, 1753 UTC

Title: Narrowband A.M. Radio Aussie Stations? Interesting tidbits that Boomer found.
Post by: ThaDood on September 20, 2025, 1753 UTC

https://austamradiohistory.com/wp-content/uploads/2019/09/narrowband-a.m.-broadcasting-stations-1611-1701-khz.pdf   So, the USA and Canada aren't the only ones using the upper MW band.

Title: Re: Narrowband A.M. Radio Aussie Stations? Interesting tidbits that Boomer found.
Post by: NQC on September 26, 2025, 2335 UTC

Hey Thadood,

Odd that these are referred to as “narrow band” .

Is this the Aussie term for X band ?

I would not think it refers the mode of transmission somehow.


de NQC

Title: Re:Narrowband A.M. Radio Aussie Stations? Interesting tidbits that Boomer found?
Post by: ThaDood on September 27, 2025, 1533 UTC

Um... Now, I have to remember where I read about where 'Narrow-Band' has more to do with limited audio frequency bandwidth of these stations, like no more than 3 - 4kHz. (Not exactly hi-fi, is it?) Still, doesn't seem to stop these stations from playing music over them.

Title: Re: Narrowband A.M. Radio Aussie Stations? Interesting tidbits that Boomer found.
Post by: Brian on September 28, 2025, 1046 UTC

Quote from: NQC on September 26, 2025, 2335 UTC

Hey Thadood,

Odd that these are referred to as “narrow band” .

Is this the Aussie term for X band ?

I would not think it refers the mode of transmission somehow.


de NQC

The spacing of the channels is 9 kHz, the same as Europe, so no need for audio less than 4.5 kHz width providing adjacent channel transmitters are sufficiently apart, location wise.
So I guess it refers to the band.

Title: Re: Narrowband A.M. Radio Aussie Stations? Interesting tidbits that Boomer found.
Post by: europirate on October 22, 2025, 1835 UTC

I guess they are refering to 'narrow casting' rather than 'broad casting', as these stations won't generally be receivable on a normal radio in Australia & New Zealand.

Although the band is 531–1701 kHz with 9kHz spacing like Europe there are a few low power stations above 1602 kHz for things like weather, traffic and tourist info.

I my experience of travelling in and around NSW, car radios stop at 1602 and like everywhere else in the world folks aren't buying new AM radios, it's FM and DAB all the way.