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Cordless phone techy stuff.

merlin

Member
Joined
Jul 3, 2003
Messages
182
Location
lasvegas,nv.
Anybody on the site play with cordless phone radio ?, specifically digital.
Got some toys to play with, fascinated with the radio chip and processor. Looking at maybe shoving the radios to the digital ham bands and many of the digital modes. Looks like Motorola and V-tech are using very similar hardware, all covering 900 Mhz through 5.8 Ghz. A 4 watt PA might make for one cool 2 band SDR.
Only lacking datasheets for the hardware.
 

intuity

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Premium Subscriber
Joined
Jun 14, 2015
Messages
22
Location
Walker County, TX
A Google search for DECT transceiver IC datasheets turned up quite a few results, but I doubt you will find much for any other variety - I may be wrong here though.

Since cordless phones are Part 15 devices, they aren't licensed by rule, thus any operation contrary to the device's certification would likely bring you afoul of the FCC's EB should your tinkering sufficiently bother anyone - mainly of concern being unintended harmonics, et cetera trashing the nearby 700/800/900 mhz public safety allocations, or less likely, other part 15 device users.

Just my 0.02. Good luck!
 

RFI-EMI-GUY

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Joined
Dec 22, 2013
Messages
4,048
HP made some HP89xx system analyzers that tested DECT. They usually go for pretty cheap, though the DECT versions have advanced since.

I have a Panasonic DECT time division repeater for cordless phone I picked up new but not compatible with my older phones, something like that might be hackerable.
 

merlin

Member
Joined
Jul 3, 2003
Messages
182
Location
lasvegas,nv.
A Google search for DECT transceiver IC datasheets turned up quite a few results, but I doubt you will find much for any other variety - I may be wrong here though.

Since cordless phones are Part 15 devices, they aren't licensed by rule, thus any operation contrary to the device's certification would likely bring you afoul of the FCC's EB should your tinkering sufficiently bother anyone - mainly of concern being unintended harmonics, et cetera trashing the nearby 700/800/900 mhz public safety allocations, or less likely, other part 15 device users.

Just my 0.02. Good luck!
What datasheets I found don't come close to the digital devices I need and yea, any mods puts such radios into another part of FCC rules.
One could still modify a 900 Mhz device for ham frequencies then it would fall under my ham license. I have the equipment to see it comply s with FCC emissions. Not much interest in the DECT6 not being used on ham bands, but the GMSK makes for a good digital radio. Looks like I have to hack the brain for its frequency and band control. Those brains have a decent on board DSP and encoder/decoder.
 

merlin

Member
Joined
Jul 3, 2003
Messages
182
Location
lasvegas,nv.
HP made some HP89xx system analyzers that tested DECT. They usually go for pretty cheap, though the DECT versions have advanced since.

I have a Panasonic DECT time division repeater for cordless phone I picked up new but not compatible with my older phones, something like that might be hackerable.
I have too much HP/Agilent stuff now, not looking to add to it. The DECT repeaters are obsolete, BDAs have taken place. Have a couple of those also but wanting to mod the duplexers for 900 Mhz ham bands.
I think the older phones were analog, why the incompatability. DECT has changed a lot too.
 
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