TV-Transmitting Antenna 490MHz - AVS Forum | Home Theater Discussions And Reviews

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post #1 of 7 Old 04-12-2016, 10:21 AM - Thread Starter
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Question TV-Transmitting Antenna 490MHz

Good day friends!
I have in the village a small TV-sender (analog) half a watt of power running at 490MHz. More than 3 years I transmit a picture of my camera showing how the weather is outside, and some music in the background all OK but I have a range of only 400 meters. I would at least 800-900 meters! I want to make a better antenna, however, because of all that I tried some of them probably did not made exactly the best that I knew ... - - So I asked you if you want to help me to understand because, after all, about antennas, signals ... but to me it is a wish already long but just can not make it ... I do not know the precise dimensions of 490MHz.

A little problem is that my house is in the middle of the village should send a signal (in all directions OMNI) Horizontal polarization because all the TV antennas are horizontal.
http://prntscr.com/aqte6s
If you can vertical polarization, made to a GP (Ground Plane) or J-Pole ... but you probably can not. Changing the polarity is losing a lot!
- Which dish do best?

From TV-sender to Antenna 5 meters by cable (H1000) 50ohm!
http://prntscr.com/aqtsg4
- Is this good? Dipoles turn 90 degrees, or what do you think, maybe another dish to do to be a good and precise at 490MHz ???
http://prntscr.com/aqttdy

THANK YOU !

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post #2 of 7 Old 04-12-2016, 07:54 PM
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Sorry I can't help you with what you ask but your post reminded me of long ago when I would broadcast from a VCR. It was pretty cool and real easy because I'd just hook everything up backwards. The VCR "out to TV" cable would be connected to an antenna pre amp input instead and then hook up the preamps output cable to an antenna and it would broadcast whatever was playing on the VCR. Of course it would only broadcast on channel 3 or 4 and would only go out a couple hundred feet but it was fun to do.
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post #3 of 7 Old 04-13-2016, 08:23 AM - Thread Starter
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Yes, hehe!
So I want (like) but I do not know what kind of antenna (model) to make to be as precise with 490MHz (horizontal polarization).

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post #4 of 7 Old 04-13-2016, 06:34 PM
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To get the range you are looking at, you probly need to add something like this to your system:
http://www.ebay.com/itm/45-Watt-RF-P...QAAOxyHIlTYrnK
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post #5 of 7 Old 04-13-2016, 09:42 PM
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A book like this would probably help: http://www.arrl.org/arrl-antenna-book

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post #6 of 7 Old 04-14-2016, 12:49 AM - Thread Starter
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Post

Quote:
Originally Posted by ctdish View Post
To get the range you are looking at, you probly need to add something like this to your system:
http://www.ebay.com/itm/45-Watt-RF-P...QAAOxyHIlTYrnK
Quote:
Originally Posted by olyteddy View Post
A book like this would probably help: http://www.arrl.org/arrl-antenna-book
-----------------------------------
The transmitter is what is on Ebay, too strong for me
I'll sue you still the best solution for me. First she wanted to try it with a precise antenna for this frequency !!!

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post #7 of 7 Old 04-14-2016, 07:43 AM
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What kind of antenna are using now? What is the type of coax cable that you are using now?
To get the range increase you are asking for you need at least 6 dB and more likely 10 dB of gain in your system. This is difficult but not impossible from a horizontal omni antenna. It would consist of something like 12 of the crossed dipoles vertically stacked all feed in phase with a total height of something around 10 feet. Other radiating elements would also be possible but the vertical size of the antenna would be the same.
John
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