CATV amp

Number04 · 22nd October 2003, 09:51 PM

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?

ashok · 23rd October 2003, 03:51 AM

You can check out the Motorola site. They make modules for CATV amplifiers. I can't remember any model numbers.
Try http://e-www.motorola.com/files/rf_i..._lib/DL209.pdf

http://e-www.motorola.com/webapp/sps...?nodeId=03fvrv

http://e-www.motorola.com/webapp/sps...20819882157623

It might be better to use modules than trying to build it from discrete parts.
Cheers.

dhaen · 23rd October 2003, 08:13 AM

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.

Number04 · 23rd October 2003, 03:05 PM

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.

22nd October 2003, 09:51 PM	#1
Number04 diyAudio Member Join Date: Sep 2003 Location: Calgary Canada	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?

23rd October 2003, 03:51 AM	#2
ashok diyAudio Member Join Date: Jun 2002 Location: 3RS	RF amps. You can check out the Motorola site. They make modules for CATV amplifiers. I can't remember any model numbers. Try http://e-www.motorola.com/files/rf_i..._lib/DL209.pdf http://e-www.motorola.com/webapp/sps...?nodeId=03fvrv http://e-www.motorola.com/webapp/sps...20819882157623 It might be better to use modules than trying to build it from discrete parts. Cheers. __________________ AM

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23rd October 2003, 08:13 AM	#3
dhaen diyAudio Moderator Emeritus 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.

23rd October 2003, 03:05 PM	#4
Number04 diyAudio Member Join Date: Sep 2003 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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