P
PDRUNEN
- Jan 1, 1970
- 0
Hi Group,
I picked up some wireless intercoms to experiment with, these a older ones
which generates a 200KHz FM signal and injects this onto the AC mains.
Can anyone tell me how they interface the signal so that the prime power and
this signal can share the copper? Any website that has projects using the
MAINS as a method of transfering binary or analog data?
Why do they use FM here? I thought 200KHz had alot of noise and would have
expected SSB or AM.
I saw a device from GE (at Target) called an instajack, this device can turn a
AC wall outlet into a phone outlet. I have an application for using this with
my computer to access the internet where I can not connect to a phone jack at
that location , I can create one.
Since I see them alot on ebay, I would suspect that the units don't work very
well. Anyone with experience with them?
Can the AC mains be used for UHF frequencies? I would place a ferrite core at
the 5/8 wave point so that the UHF signal would not go any further. The goal
here is just to listen to UHF frequency from which a message is broadcast. The
problem I see is that the 60Hz would have to be really isolated. What if a
made a coupling coil that would wrap around the rolex to create an inductive
coupled transformer? A ferrite core would be placed around the Rolex at the
5/8 watt distance.
So, any thoughts?
PDRUNEN
I picked up some wireless intercoms to experiment with, these a older ones
which generates a 200KHz FM signal and injects this onto the AC mains.
Can anyone tell me how they interface the signal so that the prime power and
this signal can share the copper? Any website that has projects using the
MAINS as a method of transfering binary or analog data?
Why do they use FM here? I thought 200KHz had alot of noise and would have
expected SSB or AM.
I saw a device from GE (at Target) called an instajack, this device can turn a
AC wall outlet into a phone outlet. I have an application for using this with
my computer to access the internet where I can not connect to a phone jack at
that location , I can create one.
Since I see them alot on ebay, I would suspect that the units don't work very
well. Anyone with experience with them?
Can the AC mains be used for UHF frequencies? I would place a ferrite core at
the 5/8 wave point so that the UHF signal would not go any further. The goal
here is just to listen to UHF frequency from which a message is broadcast. The
problem I see is that the 60Hz would have to be really isolated. What if a
made a coupling coil that would wrap around the rolex to create an inductive
coupled transformer? A ferrite core would be placed around the Rolex at the
5/8 watt distance.
So, any thoughts?
PDRUNEN