durable AM/FM radio

[CVT]

Hi guys!

MIA has different frequencies for approach, departure, arrival, ground, flight advisories and etc. Not to mention different ATC handlers for every sector. I'm not really an expert on this one because this is an ATC thing and my radio license doesn't cover this so I won't go deeper. and yes, all civilian aircrafts and airports in the world still use VHF-AM. AFAIK, other militaries like the US use UHF.

I do notice that, the disadvantages of AM radio is diminished when you increase in altitude.

Thank you for confirming bro... I also read that aircraft communication is single-side band (SSB),- a variation of AM for a more efficient use of transmitter power,- with a little complication on the receiver side... Basically kasi,- ground wave ang AM,- and so mas malayo ang abot/bato for a given power and height (of the antenna)....

Mukhang hahanap nga ako ng shortwave radio receiver.... from the great amazon....


“The measure of a man is what he does with power”
24.0K:fuzzy:

[dr. d]

theoretically, am has better useful range..
am, under certain conditions, can be reflected by our atmosphere. can you hear those chinese am stations at night?
fm is line-of-sight. our formerly superb TV signals became impossible, once the ayala buildings arose..

[crosswind]

yup
AM can work anywhere unlike
FM when in the province or basement it wont work

[dr. d]

yup
AM can work anywhere unlike
FM when in the province or basement it wont work

surprisingly, walang dzmm (am) sa ayala tunnel, while i can still get some fm...

[remzam]

the higher the frequency, the better it is with penetrating walls in sending the signals. however, vhf and beyond are mainly line of sight. our radio fm stations belong to vhf (very high frequency)

our am stations can send signals farther simply because our am station, about 500khz-1300khz, falls under the category of HF (high frequency). compared to vhf, hf signals can bounce on our atmosphere thus being able to reach longer distances. that's why in the provinces, especially far flung areas, am is still the king. am requires very little resources to send signal to a certain distance compared to fm. however fm has better sound quality than am. thus many am stations traditionally use it for voice while fm stations use the frequency for music.

if you do swl (short wave listening), a basic sw radio can receive signals from Taiwan, China, and nearby countries. With a good antenna set up, you can even listen to stations from Europe, Africe, or even US. This is what old folks do before tv cable, and even internet.

the reason why it's hard to hear am signals like dzmm inside the ayala tunnel is because it can not penetrate the concrete wall while fm can.