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Old 22nd October 2003, 09:51 PM   #1
diyAudio Member
Join Date: Sep 2003
Location: Calgary Canada
Question CATV amp

I am considering making a small CATV amplifier for my home. I was plaining on using simple op-amps for a gain of 10dB or so. Anyone have any schematics or websites that cover this material?

Or better yet, have any first hand experience?
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Old 23rd October 2003, 03:51 AM   #2
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Location: 3RS
Default RF amps.

You can check out the Motorola site. They make modules for CATV amplifiers. I can't remember any model numbers.

It might be better to use modules than trying to build it from discrete parts.
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Old 23rd October 2003, 08:13 AM   #3
dhaen is offline dhaen  Europe
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Join Date: Jun 2002
Location: U.K.
There are a number of CATV standards.
Assuming that yours is the simplest simplex system, then an RF distribution amp 80MHz - 850MHz would do.
The (UK) cost for one of these is less than the component cost for making one.
If you do decide to try anyway, then the solution I used (many years ago) was a BFY90 or BFR90 transistor in common emitter. This must be mounted on a ground plane with very small "non-inductive" resistors. Lead lengths 1mm or less. Decoupling caps must be 1GHz types (feed-through types are best).
Still wanna do it? I'll draw you a schematic and layout if you're serious
There are probably better transistors now. You might not get the full 10dB out of 1 stage.
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Old 23rd October 2003, 03:05 PM   #4
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Location: Calgary Canada
Well, sound like more work then i really wanted to do. Might as well go to Radio Shack and get one for 20$ or so.

Thanks for the feedback.
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