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Old 11-24-2015, 11:44 PM   #1
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Default 96 3200SCR TV antenna and pre amp

Next project!
The little TV antenna amplifier in the cabinet has a burned up resistor, to the point of I cannot make out the color codes. (Anyone? anyone?)
Manufacture is long gone.
And does the little round (factory) antenna work for anyone? Haven't seen the little red led ever light up, but that could be due to the burnt resistor.
I have a backup plan, (Dish network/ tailgater pro)but wanted to see what I could do with this first.
Jim



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Old 11-25-2015, 12:39 AM   #2
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Jim, Since the digital TV switch, you need a different antennae to get over the air channels. If you want to replace, you should be able to get the powered amp at any RV parts dealership.
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Old 11-25-2015, 12:41 AM   #3
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With just the coax going out to the arch, I can get 4 digitals channels now!
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Old 11-25-2015, 01:42 AM   #4
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Jim I am not seeing any active components on the board other than the diode which is split wide open, not sure this is an amp or just a splitter as it has a connection to tie the TV and radio to the antenna.

Also the shields of the coax should be tied to the ground otherwise signal integerity is impacted.

Is there more to this thing?
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Old 11-25-2015, 08:13 AM   #5
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Nope, about it. The important part is the +9v it is supposed to pass to the antenna itself. That is where the amplification happens, i suppose.
The coax shields all have metal clamps that connect them to circuit board/traces.
Shown removed in the pics.
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Old 11-25-2015, 08:15 AM   #6
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In the first pic, the two screws, closest to my thumb, is where the +12v from the boat connects.
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Old 11-25-2015, 01:11 PM   #7
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Looking at the picture again I can see the impression the clamp made on the upper cable.

There is a place in Tx called fixyourboard that repairs all kinds of circuit boards, you may want to call them and see if they can fix it. I used them to fix an oven board that went bad and discontinued.

This is a simple two sided board that splits the antenna to the TV and radio as well as couples the 12V onto the antenna coax to power the amp in the antenna assembly.
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Old 11-25-2015, 01:25 PM   #8
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Jim studying the pictures some more it appears the the diode and resistor are in series and that the diode is connected to the power and the resistor to the center conductor of the coax. This is how power is coupled onto the antennas coax.
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Old 11-25-2015, 01:31 PM   #9
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Any ideas about the values?
Diode IN4002? Resistor?
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Old 11-25-2015, 01:43 PM   #10
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The diode is of the IN4000 series and a IN4002 will probably work.

Can you post a closer shot of the resistor as it blurs when I zoom in?
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Old 11-25-2015, 05:25 PM   #11
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Am on the road (to bass pro shop!!) Will as soon as i get back.
Thanks
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Old 11-26-2015, 01:16 AM   #12
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Unsolder resistor, fell apart.
Funny thing, The diode stills shows good. (.531vdc one direction only. Fluke 87 on diode setting)



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Old 11-26-2015, 04:56 AM   #13
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.531vdc? Do you mean ohm? It should low resistance in one direction and very high resistance in the other.

A diode will drop .7V across it.

Cannot make out the resistor markings.
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Old 11-26-2015, 01:37 PM   #14
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Thats what i thought too but, on the diode setting, my fluke says dc voltage on the screen.
On the ohms setting, 150k one direction, something meg ohms in the other.
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Old 11-26-2015, 02:44 PM   #15
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Ok the diode setting uses its battery to pass current through it and calculates the voltage drop.

The 150 K is high and I feel it's damaged and should be replaced.
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Old 11-26-2015, 02:49 PM   #16
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Looks pretty freakin damaged too.
Hope you all have a happy Thanksgiving!
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Old 12-03-2015, 10:50 AM   #17
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Hey Look! The mfg responded to my inquiry!

Hi
The burned “resistor” is a coil of 4.2 H (micro Henry) or at least 1 H on some ceramic form with a resistance of only a few Ohm.
The black component with long legs is a diode 1N 4007 for 1 Ampere and 1000 Volt.
As long as you only are drawing max 100 mA (0.1 A) for some amplifier everything is OK, but with a load of several Ampere in case of short circuit the result will turn out as on the pictures.

On a boat or other places do not mix things with both plus and minus on ground. Nearly all known amplifiers including Triax has minus on ground and therefore positive supply current.

Med venlig hilsen / Kind regards / Mit freundlichen Gren

Triax A/S
Paul-Erik Klitten Jensen


So the IN4007, no problem, the coil ? Is that a cap with a value of 4.2 uh?
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Old 12-03-2015, 12:28 PM   #18
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Jim a coil and cap are two different animals.

Coil (choke) is conductive between its two leads and is similar to the wire wound ones on the board but in this case embedded in ceramic instead of air. Their value is rated in henry's.

A cap has plates one connected to each lead with a dielectric between them. Their value is rated in farads.

Both can store energy; Coil does is by producing a magnetic field and a cap does it by building up a charge across its plates.

The coil should be easy enough to find just search for 4.2 H ceramic coils.
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Old 12-03-2015, 12:31 PM   #19
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And how the heck do you make the "micro" symbol on your keyboard!
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Old 12-03-2015, 03:28 PM   #20
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Copy/Paste works
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