TV antenna booster
Description.
The circuit shown here is of a TV antenna booster based on the transistor BF180. The circuit operates in the UHF band and has a gain of 15dB. Capacitors C2,C3 C4 ,C5 and inductors L3, L4 forms a UHF band pass filter. The input signal is fed to the emitter of Q1 through this filter. Resistor R2 and R3 biases the transistor Q1 which is wired in the common base configuration.
Circuit diagram.
Notes.
- Assemble the circuit on a good quality PCB.
- For better performance, enclose the circuit in a metal box.
- The circuit can be powered from 12V DC.
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Pls send right up on fire alarm using thermistor
please wht is the function of L1 and L2 and C7, C6, C8, C1, R1. I have to defend this in my project please.
saya membutuhkan antena yng cocok untuk di daerah pegunungan yng sinyalnya sangat lemah sekali. tolong ksik petujuk/ jawabannya. thankyou
Could you please send me a PCB layout of this TV booster circuit. Thank you very much.
thanks alot. Ill makd one
In winding inductors for RF designs, this measuring circuit allows the designer to know exactly when the desired inductance has been achieved. As an example, the number of turns for a single layer air core inductor is given by
N =[ √l X (9a + 10b) ]/ a²
where
l = inductance in microhenries,
a = coil radius in inches,
b = coil length in inches,
N = number of turns.
How do you know what guage wire to use with this formula?
Hi whow can i make those inducters as they are not aveilable in market?
woo. It works well but how can i increase gain?
Hi use cable TV amplifier appeared earlier on this site
Hi
for VHF?
PLEASE HELP ME
Hi Howard use a low pass filter for DC and Hi Pass filter for the RF. (just a capacitor to block DC and a choke to block RF.
I’d like to build manhatten-style (point-point, directly on a copper-clad board), mount it on the back of a UHF bow-tie antenna, and powered from a wall-wart at ground level. How can I separate the DC power from the RF if I use only the RG-6 feeder cable for the interface?
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Hi Manir you can use 2N918 BF594 BF597 BF595 BF197 BF195 BF194 BF195 BF 173 BF176 any high frequency transistor can be tried
Hi,
BF180 is not available in the stores around Toronto, 2SC2570 is not either.
What are the substitutes of BF180?
Thanks.
Manir
Hi Roger i have not yet tried with BF180 but i tried with 2SC2570 really good performance in UHF band noisey signal will improve and the grainy picture will get improved, audio mush also will come down.( you cannot use where signal strength is quite high
is this really good?