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VHF Air Radio..help  
User currently offlineL-1011Alpha From Puerto Rico, joined Feb 2000, 331 posts, RR: 0
Posted (14 years 1 month 3 weeks 5 days 2 hours ago) and read 2040 times:

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.
14 replies: All unread, jump to last
 
User currently offlineIainhol From , joined Dec 1969, posts, RR:
Reply 1, posted (14 years 1 month 3 weeks 5 days 2 hours ago) and read 1931 times:

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


User currently offlineCapt. Bob From , joined Dec 1969, posts, RR:
Reply 2, posted (14 years 1 month 3 weeks 5 days 2 hours ago) and read 1930 times:

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.


User currently offlineL-1011Alpha From Puerto Rico, joined Feb 2000, 331 posts, RR: 0
Reply 3, posted (14 years 1 month 3 weeks 5 days 1 hour ago) and read 1921 times:

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.
User currently offlineAAR90 From United States of America, joined Jan 2000, 3451 posts, RR: 47
Reply 4, posted (14 years 1 month 3 weeks 4 days 23 hours ago) and read 1918 times:

>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!
User currently offlineBruce From United States of America, joined May 1999, 5036 posts, RR: 16
Reply 5, posted (14 years 1 month 3 weeks 4 days 11 hours ago) and read 1904 times:

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
User currently offlineL-1011Alpha From Puerto Rico, joined Feb 2000, 331 posts, RR: 0
Reply 6, posted (14 years 1 month 3 weeks 4 days 10 hours ago) and read 1905 times:

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.
User currently offlineB744 From New Zealand, joined Dec 1999, 491 posts, RR: 0
Reply 7, posted (14 years 1 month 3 weeks 4 days 10 hours ago) and read 1917 times:

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.


User currently offlineCapt. Bob From , joined Dec 1969, posts, RR:
Reply 8, posted (14 years 1 month 3 weeks 4 days 5 hours ago) and read 1909 times:

B744 is close but not totally right

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

Cheers


User currently offlineB744 From New Zealand, joined Dec 1999, 491 posts, RR: 0
Reply 9, posted (14 years 1 month 3 weeks 4 days 5 hours ago) and read 1907 times:

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.


User currently offlineMirage From Portugal, joined May 1999, 3122 posts, RR: 15
Reply 10, posted (14 years 1 month 3 weeks 4 days 4 hours ago) and read 1906 times:

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


User currently offlineKaplano1 From , joined Dec 1969, posts, RR:
Reply 11, posted (14 years 1 month 3 weeks 3 days 23 hours ago) and read 1905 times:

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.


User currently offlineL-1011Alpha From Puerto Rico, joined Feb 2000, 331 posts, RR: 0
Reply 12, posted (14 years 1 month 3 weeks 3 days 9 hours ago) and read 1888 times:

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.
User currently offlineBen2 From , joined Dec 1969, posts, RR:
Reply 13, posted (14 years 1 month 3 weeks 3 days 8 hours ago) and read 1890 times:

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.

User currently offlineBruce From United States of America, joined May 1999, 5036 posts, RR: 16
Reply 14, posted (14 years 1 month 3 weeks 3 days 3 hours ago) and read 1886 times:

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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