| King Jack antenna power injector without switch? [message #292928] |
Sat, 26 December 2015 08:21  |
rcjordan
Messages: 1913
Registered: October 2012
Location: Elizabeth City, North Car...
Karma: 1
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At the rallies, rv forums, and review sites the King Jack antenna seems to be the way to go for good OTA reception. I bought one of the units with the pedestal and I want to play with portable-mount options using a 50' coax cable rather than poke yet another hole in the roof. The included wall-mount switch is not the way I want to wire it, but it has the power injector built in. What separate power injector would be the best to put inline? 120v plug-in would probably be the most convenient for my setup.
SOLD 77 Royale Coachmen Side Dry Bath
76 Birchaven Coachmen Side Wet Bath
76 Eleganza
Elizabeth City, NC
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| Re: King Jack antenna power injector without switch? [message #292930 is a reply to message #292928] |
Sat, 26 December 2015 09:03  |
rcjordan
Messages: 1913
Registered: October 2012
Location: Elizabeth City, North Car...
Karma: 1
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>you didn't get everything you wanted at Skycraft!
That's because I don't know jack about electronics, Johnny.
Really, I'm making a list of things I saw there on the last trip and **SHOULD HAVE** purchased. I'm headed back soon enough.
These 12v injectors are sorta scarce on the internet.
SOLD 77 Royale Coachmen Side Dry Bath
76 Birchaven Coachmen Side Wet Bath
76 Eleganza
Elizabeth City, NC
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| Re: King Jack antenna power injector without switch? [message #292939 is a reply to message #292928] |
Sat, 26 December 2015 13:35 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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RC, the injector is dead easy to make. shouldn't cost 5 bux at Skycraft. Get two panel mount F connectors, an RF choke with big enough wire to handle maybe half an amp, a silver mica cap about .01uF, and a minibox with ends just big enough to mount the connectors, and a 12V 500mA wallwart. Or put a power connector on the box and feed it with fused 12V from your coach. get the box small enough for the inside of the two connectors to be close. Solder the cap between the center conductors. Solder the RF choke to the center of the antenna end connector (Mark it ANTENNA, mark the other connector RECEIVER)), and feed the +12V to the other end of the choke. Ground both connectors with a piece of bus bar and put the minus of the 12V to the bus bar. The choke feeds the 12v but blocks the RF so the antenna rf isn't shorted by the internal impedance of the 12V - which is quite low. The cap passes the RF to the receiver, but blocks the 12v from getting to it. If everything is tight and close inside, this will pass RF up to about blue light.
And before you go to this trouble, look closely at the options on your receiver - some have a switchable 12V feed listed in the setup which will do it for you.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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