L-1011Alpha
Topic Author
Posts: 296
Joined: Mon Feb 14, 2000 8:23 pm

VHF Air Radio..help

Wed Feb 23, 2000 11:16 am

OK:
To what are the VHF air radios for? What do I listen in those things?
THANKx
"For Us, Sky is not the limit.. Its Ground" / L-1011Alpha.
 
Guest

RE: VHF Air Radio..help

Wed Feb 23, 2000 11:49 am

They are for making position reports over large bodies of water like the Atlantic or Pacific.
Iain
 
Guest

RE: VHF Air Radio..help

Wed Feb 23, 2000 12:00 pm

I hate to disagree but...you're wrong.
VHF radio is the main communications and navigations frequencies used by civil aviation. Starting with 108 kz on to 135. kz. All the airport frequencies and basic ATC ACC calls are made in this range as are all the nav/aids namely localizer/and vor frequencies and ATIS freq. If you have a receiver for vhf than you can tune into your local airport tower and listen to the conversations of pilots and controllers. It works on a "line of site" reception so if you only get the pilots and not the control tower than you are too far away from the tower to hear the controllers.
The frequency used for high alt. is actually UHF and this is used mostly for long distance high altitude comm. because of distance.
I hope this helps you.
Capt. Bob.
 
L-1011Alpha
Topic Author
Posts: 296
Joined: Mon Feb 14, 2000 8:23 pm

RE: VHF Air Radio..help

Wed Feb 23, 2000 12:37 pm

Thanks cap bob..
That is that I was seek about.How much are the cost of those radios?
"For Us, Sky is not the limit.. Its Ground" / L-1011Alpha.
 
AAR90
Posts: 3140
Joined: Fri Jan 21, 2000 11:51 am

RE: VHF Air Radio..help

Wed Feb 23, 2000 2:48 pm

>The frequency used for high alt. is actually UHF and this is used mostly for long distance high altitude comm. because of distance.

UHF is also line of sight with no noticable difference in range from VHF.

Perhaps you were thinking of HF? Those freqs can travel around the world in the right conditions.

Been there, done that, don't want to do it again. ;-)

An ex-hawkeye driver
*NO CARRIER* -- A Naval Aviator's worst nightmare!
 
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Bruce
Posts: 4935
Joined: Tue May 18, 1999 2:46 am

To L1011Alpha

Thu Feb 24, 2000 2:41 am

I got a lttle radio at Radio Shack for $25 !!!

It has the vhf band. I can receive the tower just like Capt. Bob said. I can receive the pilots only calling the Atlanta Center because that's about 140 miles away. If the plane is cruising at FL350 within like 20 miles of my home I can get them, loud and clear.
Bruce Leibowitz - Jackson, MS (KJAN) - Canon 50D/100-400L IS lens
 
L-1011Alpha
Topic Author
Posts: 296
Joined: Mon Feb 14, 2000 8:23 pm

RE:To Bruce

Thu Feb 24, 2000 3:16 am

Hi Bruce:
What is the name of those radio?I want to buy one.I have a near radio shack here.
At What many miles of my house those radio receive?
(above my house pass airplane every minute)
"For Us, Sky is not the limit.. Its Ground" / L-1011Alpha.
 
b744
Posts: 477
Joined: Thu Dec 30, 1999 5:48 pm

RE: VHF Air Radio..help

Thu Feb 24, 2000 4:03 am

Capt. Bob almost got it right! The VHF aviation band frequencies are 108-136MHz (not kHz) and by the way are AM, as opposed to most other services (ie landmobile, maritime) being FM.

AAR90 is correct in that it is HF radio that is used for long distance communications; HF being designated as 3 - 30MHz. Specific frequencies used in this part of the world (the Pacific) are 4.6 - 4.7MHz, 4.9MHz, 5.4 - 5.7MHz, 6.5 - 6.7MHz, 8.8 - 9MHz & 13.2 - 13.36 MHz. These bands are also used for military use as well, such as 13.2 - 13.36MHz.

Some aeronautical beacons can be found in the medium frequency (MF) band also, being 300kHz - 3MHz.

In summary:

Medium Frequency (MF) band - 300kHz to 3MHz
High Frequency (HF) band - 3MHz to 30MHz
Very High Frequency (VHF) band - 30MHz to 300MHz
Ultra High Frequency (UHF) band - 300MHz to 3GHz

As has already been pointed out, VHF & UHF signals are generally 'line of sight', which means if you can see the aircraft, then you should be able to hear it, provided of course you have an efficient antenna.
 
Guest

RE: VHF Air Radio..help

Thu Feb 24, 2000 8:49 am

B744 is close but not totally right

108 - 136 mhz IS FM in fact the extension of your FM radio band.

Cheers
 
b744
Posts: 477
Joined: Thu Dec 30, 1999 5:48 pm

RE: VHF Air Radio..help

Thu Feb 24, 2000 9:05 am

Well...... not actually. True, the 108-136MHz band is just above the FM broadcast band, but Amplitude Modulation (AM) transmission is used. Generally speaking, you can of course use pretty much any type of modulation in any frequency band. In the old days, most VHF radio services were AM but over time, these have been migrated to FM. ie Same frequency bands, but now different modulation technique. The reason for this migration is 'cos FM sounds much clearer & is less susceptible to interference. The VHF aviation band is (as far as I am aware) the only exception to this migration trend because there is simply too much existing equipment in too many countries to migrate this frequency band to FM - the cost and co-ordination makes it impossible.

Apart from the VHF 108-136MHz band, AM is still used in the MF and HF bands, but most voice traffic is done with Single Side Band (SSB) modulation.
 
mirage
Posts: 3612
Joined: Mon May 31, 1999 4:44 am

RE: Capt Bob

Thu Feb 24, 2000 9:42 am

I'm a radio amateur and I can tell you that B744 is very right on what he's saying. FM is NOT used on the VHF airband, AM is.
Also, you say Mhz and not kz on the VHF band and the frequency used for high alt. is actually HF NOT UHF. Most of voice communications on HF are made on USB mode.

Luis, Faro, Portugal
CT2GLT
 
Guest

RE: VHF Scanners

Thu Feb 24, 2000 2:46 pm

I use a VHF scanner. It is a Uniden 220XLT Handheld Scanner and it picks up all aviation frequencies along with other MHz which let you listen to the police UHF radios, etc (in Australia).

It is great to have a scanner if you like to visit the airport and watch planes or take aircraft photos.

Regards,
Steven.
 
L-1011Alpha
Topic Author
Posts: 296
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RE: VHF Scanners

Fri Feb 25, 2000 4:27 am

well thanks Kaplano1.I would like that you or someone tell me anothers good radios to buy
"For Us, Sky is not the limit.. Its Ground" / L-1011Alpha.
 
Ben2
Posts: 143
Joined: Fri Sep 17, 2004 2:30 am

RE: VHF Scanners

Fri Feb 25, 2000 5:50 am

I own a Uniden BC235XLT. Very nice scanner with a trunktracking feature that I have yet to use  It costs about $200. There are plenty of nice sacanners you can get for Airband that cost under $200 though.
 
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Bruce
Posts: 4935
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To L-1011 Alpha

Fri Feb 25, 2000 10:41 am

I don't know the model but the Radio Shack catalog number is 12-456.

it is a small multi-band radio with am/fm/tv/weather/vhf

4 "aa" batteries.

very good at picking up the signals!
Bruce Leibowitz - Jackson, MS (KJAN) - Canon 50D/100-400L IS lens

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