it went by many names, Aircell, Skytel, Aircom, Airphone, Air phone, Air-phone, Airfone, Air fone or Air-fone
Air-ground radiotelephone service
Cell phone frequencies
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it went by many names, Aircell, Skytel, Aircom, Airphone, Air phone, Air-phone, Airfone, Air fone or Air-fone
Air-ground radiotelephone service
Tech1
Member
The first generation of cordless phones were 1.6mhz for the Base and 49mhz for the handset. I used to listen to my neighbor up the street.
The mobile telephones were on Low, High and UHF bands. I have a list of the original frequencies and now a days all cell phone calls are digital.
The mobile telephones were on Low, High and UHF bands. I have a list of the original frequencies and now a days all cell phone calls are digital.
robertwbob
KE0WRU
As an old now deceased electronics tech used to say, give me time if the signal is wireless i can hear them.he made some interesting radios.
But he was well trained via uncle sam in viet nam days
But he was well trained via uncle sam in viet nam days
Looks like I should have kept my mouth shut about the cellular frequency capability of the SDRUno software. They "fixed" it with the latest update.
SDRuno – SDRplay
SDRuno – SDRplay
robertwbob
KE0WRU
Cell phones are a sore a&& subject today.my phone was warrentied today,so far since i got it home at 11 am its done 9 updates rendering it useless for 7 hours and it says it needs 1 more update that will take approxamitly 45 minutes. I called phone company with my other phone,we had a heated discussion . I know i will loose they are big.it should been updated and ready.
And sadly its not working much better than what it replaced
And sadly its not working much better than what it replaced
majoco
Stirrer
Our work shift crew used to have a lunch at a cafe/bar in town on Fridays which was also frequented by a load of 'suits' who often would talk on their cellphones inside the bar. One of the gang had an early scanner that could receive the 900MHz band and if one of the 'suits' was getting too obnoxious our guy would find the frequency, turn it up loud and put the receiver on the table. Of course, the offensive 'suit' didn't know as he could already hear both sides of the conversation - and so could we.... 
Oops!
milcom_chaser
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Got a good horse racing bet tip on 49Mhz. Went to Santa Anita and won! Too bad we didn't bet more money...
milcom_chaser
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We found a full duplex link on UHF mil-band while driving through Taos, NM. It was Donald Rumsfeld when he was in office. Crazy!
D
DaveNF2G
Guest
The software and hardware can still tune those frequencies. They cannot be scanned with the new scan feature, which brings the software into compliance with ECPA and TDDRA. The block was not necessary for a non-scanning SDR (by one interpretation of the law).
AC9BX
Member
The whole blocking thing is/was mostly moot. Before 1986 the broadcast TV band went to 890Mhz, the top of channel 83. In 1983 internationally that was changed and the band ended at 806MHz, channel 69. One could easily use their TV set, choose channels 80 to 83 on their mechanical analog TV tuner, adjust the fine tuning, and hear phone calls. Those tuners continued to be used for a decade or more even though TV didn't go there since the design worked and there were warehouses full of them. Frequency shifting, although designing for UHF can be tricky, is not a difficult thing. If one really wanted to they could build a converter to shift 870Mhz down to a range their radio supported. It's a common practice today, HF upconverters for Realtek dongles for example.
Of course in 2009 the TV band was shortened to 698MHz, channel 51, and will soon be shortened again to 608MHz, channel 36. (In the USofA)
Of course in 2009 the TV band was shortened to 698MHz, channel 51, and will soon be shortened again to 608MHz, channel 36. (In the USofA)
It's already being done not only by our government but local law enforcement too!
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