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TV antenna amplifier power injector

E

eug k

Jan 1, 1970
0
Hi,

I'm trying to hook up an active antenna that needs 5V at 30ma to be fed
thru the coax, to a tuner that doesn't provide that power. I'm
assuming I would be able to just hook up a 5V supply (from a USB
socket in this case) to the coax, with a capacitor between the centre
conductor and the tuner input.

Will this affect anything adversely? Is there a better way to do it?
I wouldn't expect the weak RF signal to affect the computer much, but
who knows. :)

The antenna will be mounted indoors near a window so lightning or
surges shouldn't be too much of a problem.

I thought of modifying a 2-way passive splitter for this purpose.
What cap should I use?>

I'd like to receive VHF and UHF, from 170-230MHz and 500-600MHz.
It's a digital TV receiver if that makes a difference.


thanks!
 
P

Phil Allison

Jan 1, 1970
0
"eug k
I'm trying to hook up an active antenna that needs 5V at 30ma to be fed
thru the coax, to a tuner that doesn't provide that power. I'm
assuming I would be able to just hook up a 5V supply (from a USB
socket in this case) to the coax, with a capacitor between the centre
conductor and the tuner input.


** The 5 volt DC power MUST be fed onto the co-ax via an RF inductor.

This is to isolate the PSU from the RF signal.

A value of 5uH should be OK.




......... Phil
 
E

eug k

Jan 1, 1970
0
Phil Allison said:
"eug k


** The 5 volt DC power MUST be fed onto the co-ax via an RF inductor.

This is to isolate the PSU from the RF signal.

A value of 5uH should be OK.

OK.. what about the capacitor?

thanks!
 
eug said:
Hi,

I'm trying to hook up an active antenna that needs 5V at 30ma to be fed
thru the coax, to a tuner that doesn't provide that power. I'm
assuming I would be able to just hook up a 5V supply (from a USB
socket in this case) to the coax, with a capacitor between the centre
conductor and the tuner input.

Will this affect anything adversely? Is there a better way to do it?
I wouldn't expect the weak RF signal to affect the computer much, but
who knows. :)

The antenna will be mounted indoors near a window so lightning or
surges shouldn't be too much of a problem.

I thought of modifying a 2-way passive splitter for this purpose.
What cap should I use?>

I'd like to receive VHF and UHF, from 170-230MHz and 500-600MHz.
It's a digital TV receiver if that makes a difference.


thanks!

eug

Keep the inductor lead which connects to the RF path very short.

steve balstone
stephen balstone
 
E

ehsjr

Jan 1, 1970
0
eug

Keep the inductor lead which connects to the RF path very short.

steve balstone
stephen balstone

What inductor? Why keep the inductor lead short?
Ed
 
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