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#1
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Hearing Telephone Conversations
About 10 years ago now, one sunday morning, I was tuning around the SW
Bands. (On a very common Panasonic Radio that had the basic SW frequencies. 6,000 - 19,000 approx.) It was one of my first forrays into SWL (and one which kept me hooked.) and after a while of tuning around I stumbled across what seemed to be a conversation with two people, in particular two elderly women. At first I thought it was a radio soap/drama as the conversation was full of gossip. (In fact one of the elderly women reported the death of a close friend, to which the other replied with arresting apathy.) About 5 minutes of this insued.. Then both parties said goodbye to each other and hung up, with a small beep to signal the end of the call. I waited for about ten seconds and I heard the ringing tone again (beep, beep..... beep,beep in case you didn't know.) The same voice was heard (she must have picked up the phone and dialled someone else.) And the conversation continued. (With the previous caller being gossiped about this time,) I know it is possible to listen into telecommunications, and they have designated frequencies, but I was surprised to hear that kind of thing at all so easily. I don't condone listening to private conversations, but this was a one off, which I was surprised by. Is this a common occurance? Has anybody else got any good stories of hearing this kind of stuff? |
#2
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Jason,I DO condone (in fact,I have a few "gadgets" here,they are legal)
listening to private conversations.You probally had your radio tuned to somewhere around the AM 800 band and you was picking up some regular telephone conversations on that band.Fairly common,it used to be.But what with the advent of digital spred spectum modern day telephones and cell phones (mobile phones) it is getting rare to pick up such conversations on radio. cuhulin |
#3
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Listening in on private telephone conversations is where you get the
best juicey dirt.I love it! I can tell y'all stories! cuhulin |
#4
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"Jason" wrote in message ... Is this a common occurance? Yeah, alot of the older cordless phones would put spurious emissions into the SW bands. The ones from the late 70s or early 80s used frequencies just above 1600 kHz for one channel. I think the later UHF type cordless phones are SW quiet. Has anybody else got any good stories of hearing this kind of stuff? Mostly it's just so much interference. But I did overhear some mope lie to his wife and sweet talk his girlfriend. That's as good as it ever got, and that was amusing for only a few minutes. Domestic phone just can't compete with domestic SW as entertainment. Frank Dresser |
#5
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If I recall correct from flipping through the Radio Shack catalog at the
age of 8 or so, to look at all the stuff I *couldn't* have, cordless phones used to be around 27 mhz, and also some were 49 mhz. Same went for Radio- Shack RC cars. The "better" models ran at 49 mhz. |
#6
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Conan Ford wrote in
3.159: If I recall correct from flipping through the Radio Shack catalog at the age of 8 or so, to look at all the stuff I *couldn't* have, cordless phones used to be around 27 mhz, and also some were 49 mhz. Same went for Radio- Shack RC cars. The "better" models ran at 49 mhz. Follow-up, a little history he http://www.affordablephones.net/HistoryCordless.htm It was probably an image of a 27 mhz phone. |
#7
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Yes, older cordless phones, maybe the first generation oof them,
operated around 1800 kHz, just above the MW band. The base (wall) unit transmitted both sides of the conversation at a stronger level than the handset, often for a couple miles or more. These phones are probably almost all replaced by now wth the later 49 Mhz, and then the 902 Mhz types. If there is not a lot of traffic on the 49 mHz frequency, they can also be heard for somewhat lesser distances, but most of the 900+ Mhz phones use encryption schemes and are not listenable. |
#8
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#9
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In article 9,
Conan Ford wrote: If I recall correct from flipping through the Radio Shack catalog at the age of 8 or so, to look at all the stuff I *couldn't* have, cordless phones used to be around 27 mhz, and also some were 49 mhz. Same went for Radio- Shack RC cars. The "better" models ran at 49 mhz. Back in the '70s and early '80s, cordless phones used, as I remember, 5 channels around 1600-1750 kHz for the base station, and 49 MHz for the handset. Both FM, but you could receive them fairly well on an AM receiver. Later they switched to 46 and 49 MHz. I heard one neighbor, in the 3.5 MHz ham band, complaining that her phone wasn't working well. It turned out to have a stronger signal on the second harmonic than on the fundamental. Some of them of them used frequency inversion scrambling which I found out was completely useless as, even though it was an FM transmission, it could be heard perfectly well on an SSB receiver. (Or at least on my R-1000 which can run SSB with the 12 kHz wide filter). Now they run on 915 MHz, 2.4 and 5.? GHz. Good riddance. I also remember reading that some "smart" phones put out a spurious AM signal on their microprocessor's crystal clock frequency. Pre-bugged phones. Mark Zenier Washington State resident |
#10
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You may have heard "ship to shore".
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