durable AM/FM radio

**oj88** · August 12th, 2014 05:13 PM

Originally Posted by badkuk

Very informative sirs, akala ko pa naman pawala na ang AM ^_^

Now if only smartphone makers could add AM in their phones..

Three words: Ferrite core antenna

AM receivers requires a significantly long antenna (the lower the resonant frequency, the longer the wavelength). In short, AM receivers uses a very long wire coiled around a ferrite core/bar. Modern smartphones are jam-packed with parts and the last thing manufacturers need is an AM antenna eating up maybe 1/10 to 1/5 the space.

FM radio, which works on a higher frequency (VHF), are able to receive signals with a significantly shorter antenna, typically a telescopic one or by utilizing the headphone/handsfree wires (to get rid of the still bulky, telescopic antenna).

**badkuk** · August 12th, 2014 07:30 PM

Originally Posted by oj88

Three words: Ferrite core antenna

AM receivers requires a significantly long antenna (the lower the resonant frequency, the longer the wavelength). In short, AM receivers uses a very long wire coiled around a ferrite core/bar. Modern smartphones are jam-packed with parts and the last thing manufacturers need is an AM antenna eating up maybe 1/10 to 1/5 the space.

FM radio, which works on a higher frequency (VHF), are able to receive signals with a significantly shorter antenna, typically a telescopic one or by utilizing the headphone/handsfree wires (to get rid of the still bulky, telescopic antenna).

hmm, baka pwede na po earphones as antenna? :D

Seriously though, the GE clock radio i have doesn't have a physical(or at least, visible) antenna, but the reception is pretty good at ground floor, lots of buildings but relatively lots of open space.

**dr. d** · August 12th, 2014 08:58 PM

Originally Posted by badkuk

Very informative sirs, akala ko pa naman pawala na ang AM ^_^

Now if only smartphone makers could add AM in their phones..

sony did, some time back.. i think only two (me and my officemate) bought it.. i don't see the model anymore.
wala siguro ibang bumili..

i was told, the EM signals generated by the cellphone circuitry, interfered with the AM signals, requiring good shielding.. i am not sure if this is true.

besides, sosyal na sosyal ka't naka-cellphone ka na nga.. tapos makikinig ka kay kabayan at ted failon?
heh heh.

(don't get me wrong... my talapihitan is superglued to their station.)