Television Aerial Signal Amplifier

Hi everyone 8)
I'm seeking for a "VHF & UHF signal amplifier for television".

I browse the internet & found different signal amp. ckt. but there gain is to low(i.e. 10dB-20dB.)

I need to boost the aerial signal much higher.

Here in my country, majority of homes rely on the traditional aerial antenna w/c give there T.V. a weak signal. For the reason that cable system are available only here in the city.

Hence, I want to build a TV aerial signal amp to increase the weak aerial signal going to there TV sets & sell to them for low cost.
WAITING FOR YOUR FAVORABLE RESPONSE

Thank you

 

The way I read it, is you want a Distribution amplifier. If you want to supply a neighbourhood over a wide range of frequencies, you not only want gain, but some decent sized output devices, as what you will have is a Wideband RF transmitter of several watts output.

If it is just to boost the signal from an antenna, unfortunately amplifiers arn't a magic cure, as an amp cannot replace what has been lost, they can only really compensate for loss's in the system (after the amp). As the previous user said, start with the antenna.

 

A better antenna is a much better approach than a higher-gain broadband amplifier.

Amplifiers all have a signal-to-noise ratio; in general, the higher the gain, the higher the induced noise.

Antennas do not add noise, as they are passive elements. The better the design of the antenna, the higher the signal gain. There is no S/N penalty as with active devices.

 

Thank you very much for your reply

I'm really sorry about my English language

What I want is a ckt that can amplify aerial signal (VHF signal) before going to a TV.

I've search in google and I found this ckt.
Its gain is only 20dB

.....HOW CAN I INCREASE ITS OUTPUT TO approx.......50dB????
Help me to modify this ckt.

Thank you once again

 

Thank you Mr. Bill for your time

I live in the Philippines were strong typhoons visit regularly.
For this reason we can't make taller TV antenna.

That's why I'm seeking for a high gain signal amp for TV because when typhoon arrives here in our country all lines are cut including power line & cable system.

I made an Modified sine wave inverter for emergency power source to run our appliances as well as TV. But the aerial signal is weak because I'm only using the antenna of the TV itself.

I think a Signal Amp. is the last sort.

Please help me to build or modify this ckt to boost the aerial signal but w/ less noise...

Thank you once again

 

What you are asking is not possible to do without spending a fortune.

You might get 10dB or even 20dB of boost without the noise becoming unbearable.

At 50dB gain, you will have nothing but highly amplified noise.

 

I had the biggest and best TV antenna that was made in Canada high on a mast and with a rotor. I got many more stations than were listed in the TV Guide. I got a few stations in far away different directions but they were on the same channel.

The antenna had a lot of gain. My TV had a lot of gain like most TVs do. An amplifier would not make any difference exept it would add noise.

 

Thank you Guys

I think your right

I'll use the conventional aerial antenna instead.
Do you know a better design for an aerial antenna to boost the signal a little bit

...........how about a Home-made CABLE SYSTEM????
Do you think its possible????

Thanks

 

You might consider a satellite dish and a downconverter. Those are relatively small. I don't know if you can get them in the PI. I also don't know if the PI TV stations uplink to satellites.

A homemade cable system would be rather challenging. If you had to run the cable signal for much of a distance, you would have to have amplifiers every so often to boost the signal back up to acceptable levels. In cable TV systems, they use a technique nicknamed "tilt", which means that the higher frequency signals are amplified more than lower frequency signals, as the coaxial cable attenuates the higher frequencies more than the lower frequencies. By the time the signal gets to the consumer, the "tilted" signal levels have equalized across the frequency spectrum. This isn't something that would be easy to build without some rather expensive equipment.

 

Thank you Sir for your reply

I think it is more complicated & expensive to have Cable TV system at home right??

How about a shorter 'PASSIVE' aerial antenna but w/ better boost of signal???
.....do you know an antenna w/ that design???

Thank you once again.

 

You could stack 2 or 4 shorter aerials together to improve gain.

 

When I was a child, it was common to use a Yagi antenna to bring in TV stations from 40 or 50 km distant. Or more. They are stable in high winds.

 

The distance and obstrucions were not mentioned.
Either the signal is too weak to be received or the TV's input is broken.