Hello, I have a Radio Shack Amplified VHF/UHF antenna RS 15-2181 that is missing the power supply/interface module. Does Radio Shack make all their adapters the same so I could use any adapter from any remote amplifier? Does anyone have a schematic for the adapter? What is the voltage that is injected onto the COAX? Could I inject the power directly into the amplifier in the antenna with a direct power connection (not through the coax)? The antenna is attic mounted so I don't have to worry about weather. Thanks for any input or ideas, Ted
Radio Shack Amplified VHF/UHF Power Supply
Jun 05, 2005
6 Replies
Catalog # 15-2181 Bidirectional "Swept-Wing" Antenna for Local TV Channels
Owner's Manual
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Detailed Parts List
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N
Sorry, I should have noted that I got the manual and the no parts list available message from the Radio Shack site. The manual only makes one small reference to the power adapter. I got more from looking at the
15-2185 product in the catalog that lists all the parts and shows how to connect the power adapter in the manual. Thanks, Ted
Looking at the physical configuration and specifications of their various products, my guess is that RS amplifier power injectors / supplies are interchangeable; @12VDC supply voltage.
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Don't know - is there a separate isolated dc input connection there?
Thanks, Now that I've looked at other configurations, I agree the DC input is likely 12VDC. I think I will keep an eye out for the injector at local garage sales. Hmmm, I wonder what the polarity of the DC is on the coax. Probably center conduct is +.
No, there is no separate DC input connection at the antenna. I was thinking I'd just modify the amplifier to supply external power (not from the coax). The antenna is in the attic so it won't see real weather. I am assuming there is a choke between the center conductor of the coax and the power supply in the amplifier that allows the DC from the coax to pass but stops the RF. If I disconnect ths choke from the coax, the local amplifier power will not back feed the coax and damage anything on the receiving side. Then I can supply the DC between the open end of the choke and ground.
I just noticed the cover of my R-S catalog. It says, "You've got questions. We've got answers." So then why am I still asking questions? ;-) Ted
In what part of that slogan did you see them say they weren't stupid answers?
N
That's a lot of work for $34 (the cost of an inline amp with PS from R/S). Wouldn't you have to run power to the antenna location? Plus all the effort in modifying the antenna. Besides, using a separate inline amp gives you the flexibility of upgrading the antenna later if you want to.
It is your time and your money, so you decide. But if it were me, I'd take the easy route.
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