Bain Posted August 6, 2009 Report Share Posted August 6, 2009 This was in a +/- 30-year-old condo. I realize the jack's for some kind of television antenna, but does anyone know what the purposes of the transistors/resistors/capacitors are? Click to Enlarge 29.32 KB Quote Link to comment Share on other sites More sharing options...
Tom Raymond Posted August 6, 2009 Report Share Posted August 6, 2009 I know that they are used to balance unequal splits on coaxial cable systems, for example to run 3 sets from a 4 way splitter you need a resistor on the unused terminal. Without one the signal loss is remarkable. I would guess they serve the same purpose. Tom Quote Link to comment Share on other sites More sharing options...
Bain Posted August 6, 2009 Author Report Share Posted August 6, 2009 Ah . . . interesting. Thanks. Quote Link to comment Share on other sites More sharing options...
Billy_Bob Posted August 7, 2009 Report Share Posted August 7, 2009 Sometimes the combination of a resistor and a capacitor is used as a "filter" to only allow the signals you want... http://en.wikipedia.org/wiki/Band-pass_filter Then the first link below is a similar TV outlet and the second link explains about wire run distances from the antenna and signal loss... (MATV means Master Antenna TV system) Winegard ST-7700 RV Line Tap-Off 75 Ohm Selectable Isolation Outlet... http://www.summitsource.com/rv-line-tap ... -8111.html Master TV Distribution System Design... http://www.blondertongue.com/media/pdfs ... Design.pdf Quote Link to comment Share on other sites More sharing options...
msteger Posted August 8, 2009 Report Share Posted August 8, 2009 This was in a +/- 30-year-old condo. I realize the jack's for some kind of television antenna, but does anyone know what the purposes of the transistors/resistors/capacitors are? Click to Enlarge 29.32 KB The caps and resistors are designed to work as a low pass or high pass filter (depending upon their orientation) or for matching or balancing. Pass certain channels above or below whatever the resonant frequency of the filter is designed for. There shouldn't be any transistors there. Those are active devices needing to be supplied with low DC voltage (approx. 5 or 12 volts) and not passive devices like the Cs and the Rs. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.