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iPhone audio detectable with AM radio

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41–50 of 68 posts

Re: iPhone audio detectable with AM radio

#41
post #30

Earlier quoted context omitted.

Arguments by appeals to authorities like the FCC, CDC, or FAA sort of work if the authority can be trusted. For the argument to be coherent that trust must have been established by a proven track record of both employing the appropriate methods correctly and showing independence of vested interests in their reporting of the results.

Apparently you have no idea what you are talking about, so you think that these sorts of arguments work when discussing FCC emission testing. The FCC does not actually run the test, they set the standards. The tests themselves are run by various labs and testing agencies that are certified to perform the tests and who would be risking a very lucrative gig for the sake of cheating on a test for a device that will be w…

Hilariously, this is what I found when searching for the public test results of the iphone8, apologies for it being about a previous generation, but happily your argument is insensitive to such details: https://www.chicagotribune.com/investigations/ct-cell-phone-...

The summary of the above article is that yes: if you hold the phone sufficiently far away from the measuring device the detected radiation is below the levels mandated, and if someone else tries to test the emission for themselves Apple will say they did it wrong and refuse to give any explanation of what the error might be. A bullet proof system indeed.

Re: iPhone audio detectable with AM radio

#42
post #30

Earlier quoted context omitted.

Arguments by appeals to authorities like the FCC, CDC, or FAA sort of work if the authority can be trusted. For the argument to be coherent that trust must have been established by a proven track record of both employing the appropriate methods correctly and showing independence of vested interests in their reporting of the results.

Apparently you have no idea what you are talking about, so you think that these sorts of arguments work when discussing FCC emission testing. The FCC does not actually run the test, they set the standards. The tests themselves are run by various labs and testing agencies that are certified to perform the tests and who would be risking a very lucrative gig for the sake of cheating on a test for a device that will be w…

wasn't there something about Voltswagen and emissions testing...

Re: iPhone audio detectable with AM radio

#43
post #30

Earlier quoted context omitted.

Apparently you have no idea what you are talking about, so you think that these sorts of arguments work when discussing FCC emission testing. The FCC does not actually run the test, they set the standards. The tests themselves are run by various labs and testing agencies that are certified to perform the tests and who would be risking a very lucrative gig for the sake of cheating on a test for a device that will be w…

wasn't there something about Voltswagen and emissions testing...

Hush you! Authorities are infallible! Just look at the good work from the FAA, whose regulation holds human lives in the balance.

Re: iPhone audio detectable with AM radio

#44

It's probably by design, iPhones support magnetic-induction hearing aids, see here: https://support.apple.com/en-us/HT202186 The are 2 standards, the old "telecoil" (direct) and the new FM loop, both operating at low frequencies... Both work at very short ranges (inverse cube of the distance)

That is admittedly really cool. It's nice to hear that these sorts of things are just quietly included, maintained, and work well, without widespread fanfare/marketing/publicity.

Hmm. I wonder how they could be practically compromised...

Re: iPhone audio detectable with AM radio

#45

It's probably by design, iPhones support magnetic-induction hearing aids, see here: https://support.apple.com/en-us/HT202186 The are 2 standards, the old "telecoil" (direct) and the new FM loop, both operating at low frequencies... Both work at very short ranges (inverse cube of the distance)

Excellent that there is accessibility support, but at what range can people pick my calls up – especially with a directional antenna?

Re: iPhone audio detectable with AM radio

#46

It's probably by design, iPhones support magnetic-induction hearing aids, see here: https://support.apple.com/en-us/HT202186 The are 2 standards, the old "telecoil" (direct) and the new FM loop, both operating at low frequencies... Both work at very short ranges (inverse cube of the distance)

Excellent that there is accessibility support, but at what range can people pick my calls up – especially with a directional antenna?

Approximately the same distance as a good microphone can pick up the audio anyway. Read about near-field vs far-field:

https://en.wikipedia.org/wiki/Near_and_far_field

Re: iPhone audio detectable with AM radio

#47
I just tested this on my iPhone XS with both an old AM radio and my SDR receiver, and neither seemed to cause any kind of signal or interference around the 930-980 KHz range.

My dad, a radio engineer (who worked for one of the US' largest AM radio stations for a decade), also tested with his XR and couldn't find any signal. I'm wondering if either it is limited to the iPhone 7 and/or 8, or if the Twitter OP might have a faulty unit?

Has anyone else been able to replicate the result?

Re: iPhone audio detectable with AM radio

#48
post #20
post #10

Earlier quoted context omitted.

In a later tweet he says the signal is pretty strong and that he could detect it from 6 feet away

Going to have to call bullshit on this. If it was detectable at that range then he has a faulty phone. The iPhone is classified as an emitter and so it needs to undergo rather strict FCC testing to ensure that it does not emit outside of certain frequencies and at specific power levels. The device would NEVER have been approved if it emitted at this level into bands licensed to other uses.

[deleted]

Re: iPhone audio detectable with AM radio

#49
post #44

It's probably by design, iPhones support magnetic-induction hearing aids, see here: https://support.apple.com/en-us/HT202186 The are 2 standards, the old "telecoil" (direct) and the new FM loop, both operating at low frequencies... Both work at very short ranges (inverse cube of the distance)

That is admittedly really cool. It's nice to hear that these sorts of things are just quietly included, maintained, and work well, without widespread fanfare/marketing/publicity. Hmm. I wonder how they could be practically compromised...

This reminds me of the "car recall" evaluation from Fight Club:

> Take the number of vehicles in the field, A, multiply by the probable rate of failure, B, multiply by the average out-of-court settlement, C. A times B times C equals X. If X is less than the cost of a recall, we don't do one.

However, in this case, it would be:

Take the number of people who would benefit from accessibility features, A, multiply by the probability that they would buy an iPhone with these features over any other phone, B, multiply by the profit of each iPhone sale, C. A * B * C = X. If X is greater than the engineering cost to implement accessibility features, we do it.

And realistically I'm sure there's some coefficient not included that equates to how likely Apple is to spend money on something just because it's good for the world (and not because they'll bring in a profit).

Re: iPhone audio detectable with AM radio

#50

It's probably by design, iPhones support magnetic-induction hearing aids, see here: https://support.apple.com/en-us/HT202186 The are 2 standards, the old "telecoil" (direct) and the new FM loop, both operating at low frequencies... Both work at very short ranges (inverse cube of the distance)

after all this years, accessibility on iOS still blows my mind
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