Transmitter design

[IcedZ]

I want to transmit video 100+ yards. I was wondering if there is a
standard rule for approximately how far 1Watt will be receivable.
Thanks!

 

[Icky Thwacket]

I want to transmit video 100+ yards. I was wondering if there is a
standard rule for approximately how far 1Watt will be receivable.
Thanks!

Depends on bandwidth, frequency, receiver gain, link noise etc .

With the right conditions 1W of transmitted power could be receivable on
Earth when transmitted from Pluto .... and beyond

 

[IcedZ]

Depends on bandwidth, frequency, receiver gain, link noise etc .

With the right conditions 1W of transmitted power could be receivable on
Earth when transmitted from Pluto .... and beyond

Obviously. but that isn't helpful for this. Any GENERAL rule for
this? I am unsure of what frequency range I will be using, but it
will probably be in the 100's of MHz range.

 

[martin griffith]

Obviously. but that isn't helpful for this. Any GENERAL rule for
this? I am unsure of what frequency range I will be using, but it
will probably be in the 100's of MHz range.

http://www.clarkefoundation.org/docs/ClarkeWirelessWorldArticle.pdf

formula at the bottom of the 3rd page


martin

 

[LVMarc]

I want to transmit video 100+ yards. I was wondering if there is a
standard rule for approximately how far 1Watt will be receivable.
Thanks!

a 1 watt hand held radio would get out to about 1 KM.

you cant send baseband video over the radio! this has to be modualted
onto a carrier and snet that way..right!
marc

 

[Eeyore]

I want to transmit video 100+ yards. I was wondering if there is a
standard rule for approximately how far 1Watt will be receivable.

No but there are rules for radio interference.

Graham

 

[Frank Raffaeli]

I want to transmit video 100+ yards. I was wondering if there is a
standard rule for approximately how far 1Watt will be receivable.
Thanks!

No, there isn't. Somewhere between 10 meters and 55 km. You have not
provided enough data. Please provide details:
- Resolution (digital, analog?)
- Frame rate
- above helps determine required BW
- Do you need to conform to a "standard"?
- What type / size antennas can you provide?
- How high are they?
- is omnidirectional reception important?
- do you have line of sight between transmitter and receiver?
- is either the receiver or transmitter mobile?
- can you tolerate dropouts? How many?
- do you need audio too? (same questions as above)
- what's your equipment budget?

Thanks,

Frank

 

[ehsjr]

I want to transmit video 100+ yards. I was wondering if there is a
standard rule for approximately how far 1Watt will be receivable.
Thanks!

If there's no intereference, the _minimum_ is line of sight.
It will go at least as far as you can see, so your 100+
yards is no problem. Put buildings and interfereing signals
into the mix and that's a horse of a different color.

Ed

 

[Michael A. Terrell]

Put buildings and interfereing signals
into the mix and that's a horse of a different color.

Like these?
<http://images.google.com/images?q=O...=com.microsoft:en-us:IE-SearchBox&rlz=1I7GWYA>


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[Joe G \(Home\)]

Why not reverse engineer exsisting designs.

Cher here
http://www.australsurveillance.com.au/index17_frame.html

The power spec for the 100m range should be in the data sheet.

Joe

 

[ehsjr]

Like these?
<http://images.google.com/images?q=O...=com.microsoft:en-us:IE-SearchBox&rlz=1I7GWYA>

Wow! Thanks for that.
Ed

 

[Michael A. Terrell]

Wow! Thanks for that.
Ed

You NEVER know what you'll find on the net, do you? ;-)


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[Jasen Betts]

Obviously. but that isn't helpful for this. Any GENERAL rule for
this?

only the inverse square radiation law: to go twice as far you need
four timnes the power.

I am unsure of what frequency range I will be using, but it
will probably be in the 100's of MHz range.

So VHF-high band or UHF. go look at some video sending appliances.

if both ends are fixed locations directional antennas can reduce the
power needs a lot.