Northern Territory Emergency Service

[Phil]

2.5645
2.5675
3.7335
3.7365
3.7475
4.5685
4.5715
4.5775
5.1285
5.8345
7.3315
9.3015
11.4365
468.6750
468.6000
468.6250
468.6500

[Stretch]

What are the really low freqs for?

[Comint]

What are the really low freqs for?

Communications over long ranges. For example:- Darwin to Katherine.

You need different frequencies for daytime and for night-time.
You can also need different frequencies over different ranges.
ie 300 Km as against 600 Km, or 1000 Km.

--
Comint

[Stretch]

What are the really low freqs for?

Communications over long ranges. For example:- Darwin to Katherine.

You need different frequencies for daytime and for night-time.
You can also need different frequencies over different ranges.
ie 300 Km as against 600 Km, or 1000 Km.

--
Comint

So would they be HF or MF?

[hotmetal1000]

HF, hf covers 2mhz to 30mhz.

[Comint]

So would they be HF or MF?

HF
MF is 300 kHz to 3000 kHz (3 MHz)

--
Comint

[Stretch]

So the first two would be MF.

[Comint]

So the first two would be MF.

Under current ITU classifications, Yes.

However, with a range of frequencies like the NTES selection, they would usually just be referred to as 'the HF frequencies'.

The 3s format (300 to 3000 kHz (3 MHz), 3 to 30 MHz, 30 to 300 MHz, etc.) are the current classifications, but those weren't always the boundaries. Some groups consider frequencies up to about 4.5 MHz to be MF, while others are adamant that HF starts at 1.8 MHz.

--
Comint

[Stretch]

Thanks for your help Comint.

[SunnybankScan]

As you can see in this photo, the HF radio is just like their normal radio in the NT. Nice long range.

[Stretch]

As you can see in this photo, the HF radio is just like their normal radio in the NT. Nice long range.

Sh** that's a long antenna.

Nice looking car too

Wish we had them

[hotmetal1000]

I reckon that would be a Codan autoturner antenna.

[AIRMAN]

I worked in the Radio Room of the NTPOL in the early 70's. In those days we had an RCA HF transceiver and an other brand...Drake I think as a back-up.

There were two skeds a day, one in the morning and the other in the afternoon at set times. Skeds involved calling each NTPOL station thought the Territory except those south west of Alice Springs which was in their administration area. Each station had its own call sign. Darwin base was VL5DD I can't remember any of the others except 9SGX Wollogorang. Many of these police stations were in remote areas and some considerable distance from Darwin.

This was around 40 years ago so it may have changed a bit now.

The HF frequencies you listed above would not carry the distance in am. They are all SSB, so if anyone wants to listen out for them, you need an SWLRX with true carrier insertion SSB or a BFO on cheaper receivers and of course an HF antenna of some sort.