Frequencies Channels ATC and Rules

[Green Guard]

1. Today we have 160 frequencies per MegaHerz compared to 10, some thirty years ago.
And consequently they contain much more digits to spell and dial. When those are combined with your call sign, plus some odd heading and flight level, here we come to common human brain saturation,
regardless if it is your mother language or not.

So when those are already labelled "Channels", why saturate the RT with their beginning number "1" and ending number of "0" ?
Can anybody in this world select frequency without number "1" in the beginning ?
I give a credit to ATC for not calling last digit of a frequency ***,025 ***,050 and ***,075
because it is impossible to select any other number as a last digit.
but there is still long way to go with 50% of all frequencies (Channels),
being added their last digit of "0" by ATC in RT.

2. Any Student Pilot from America to Zambia, can count 160 channels per MegaHerz on a modern radio, compared to 40 per MegaHerz on Old generation Radio of few years ago.
So why
(excuse me if I am wrong here)
this New Generation Radio (Channels),
are still officially referred as a Frequencies with "Spacing of 8.33 KHz" ?!?!

Again, any of those students (including myself) can divide 1 MHz with 8.33 KHz and get ONLY 120 Channels !!!
But if we divide 1 MHz with ACTUAL 160 Channels,
here we come to (correct figure of) 6.25 KHz spacing , and NOT 8.33!!

[Flybywyre]

I give a credit to ATC for not calling last digit of a frequency ***,025 ***,050 and ***,075
because it is impossible to select any other number as a last digit.

Incorrect on two counts...............
1) You can select (for example) 134.022 0r 134.027
2) All ATC broadcast of a frequency have to be the full 6 figures
Regards
FBW

[threemiles]

you can also dial 243.0, if you are a military or 8875 if you fly across the pond

[Green Guard]

C'mon guys

get real



3 miles:

There is no question about military, space, marine or police frequencies here. RTFQ !



FlyBy***

If you think again about



"Incorrect on two counts...............
1) You can select (for example) 134.022 0r 134.027"

Unless you too, talk about some of space, marine or police frequencies here, I do not know.

But please select one of those frequencies you mentioned, on any ATC required Public Transport Radio Station (8.33 KHz spacing) in, before you reply.

[chevvron]

OK lets pretend FBW meant 134.020 and 134.025.
Anyway it's an ICAO requirement when flying in airspace designated as an '8.33kz' environment, and it's been done to death on other threads in case you haven't noticed

[Data Dad]

"Again, any of those students (including myself) can divide 1 MHz with 8.33 KHz and get ONLY 120 Channels !!!
But if we divide 1 MHz with ACTUAL 160 Channels"

You are forgetting the 40 25Khz "channels" that still exist per Megahertz. ie:132.025 (25Khz spacing) is still dialled in on your 8.33Mhz radio as 132.025 wheras 132.025 (8.33khz spacing) actually is dialled in as 132.030 on the radio.... But in this case it's transparent to the pilot because ATC would tell you to contact "XYZ on 132.030"

So you have 120, 8.33Khz "channels" and 40 25khz "channels" per Megahertz = 160 total "channels" available with an 8.33Mhz radio.

The following may make it clearer!

Spacing AAAAAAFrequencies AAA25 kHz radio displayaaa8.33 kHz radio display
25aaaaaaaaaaaa132.0000aaaaaaaaa132.00aaaaaaaaaaa132.000
8.33aaaaaaaaaa132.0000aaaaaaaaaaaaaaaaaaaaaaaaaa132.005
8.33aaaaaaaaaa132.0083aaaaaaaaaaaaaaaaaaaaaaaaaa132.010
8.33aaaaaaaaaa132.0167aaaaaaaaaaaaaaaaaaaaaaaaaa132.015
25aaaaaaaaaaaa132.0250aaaaaaaaa132.02aaaaaaaaaaa132.025
8.33aaaaaaaaaa132.0250aaaaaaaaaaaaaaaaaaaaaaaaaa132.030
8.33aaaaaaaaaa132.0333aaaaaaaaaaaaaaaaaaaaaaaaaa132.035
8.33aaaaaaaaaa132.0417aaaaaaaaaaaaaaaaaaaaaaaaaa132.040
and so on....


DD