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August 8th, 2014 10:28 AM #41
Yup it is actually. That may also be the reason why it is still in use today. Simple setup and efficient transmission.
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August 8th, 2014 10:37 AM #42sirs bakit nga ba AM ang madalas ginagamit for emergency facilities? Even the US uses AM for its NOAH system. Isn't FM supposed to be immune to signal attenuation?
Is it really just a matter of not wanting to upgrade the current AM radio infra? Or baka wala na ring available FM frequencies? While everyone was wondering when the power would come back during Glenda, panay tugtog pa rin ng mga kanta sa FM stations. Even 92.3 wasn't that informative. Maddening.
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August 8th, 2014 11:02 AM #43
Just found out why AM is still being used. AM (amplitude modulation) is not susceptible to "capture effect". Capture effect is a phenomenon when a stronger transmitting station blankets weaker stations. FM has this problem.
Capture effect - Wikipedia, the free encyclopedia
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August 8th, 2014 07:09 PM #44theoretically, 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..
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August 8th, 2014 07:19 PM #45
yup
AM can work anywhere unlike
FM when in the province or basement it wont work
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August 8th, 2014 07:38 PM #46
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August 8th, 2014 09:16 PM #47the 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.
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August 12th, 2014 11:26 AM #49Very informative sirs, akala ko pa naman pawala na ang AM ^_^
Now if only smartphone makers could add AM in their phones..
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August 12th, 2014 11:32 AM #50Very informative sirs, akala ko pa naman pawala na ang AM ^_^
Now if only smartphone makers could add AM in their phones..
Buhay na buhay ang BGC this evening. Bukas halos lahat ng restaurants. Sabi pa nung isang cashier...
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