[time-nuts] Trimble GPS antenna preamp, anyone know the gain?

[lists at lazygranch.com]

Does it somehow pass DC up to the preamp in the GPS? 

You killed on ebay. The key was the stupid description on the connectors. 

One thing to try for old parts is to use archive.org on the manufacturer's website.  

-----Original Message-----
From: Chris Albertson <albertson.chris at gmail.com>
Sender: time-nuts-bounces at febo.com
Date: Tue, 10 Jan 2012 10:59:44 
To: Discussion of precise time and frequency measurement<time-nuts at febo.com>
Reply-To: Discussion of precise time and frequency measurement
	<time-nuts at febo.com>
Subject: Re: [time-nuts] Trimble GPS antenna preamp, anyone know the gain?

On Tue, Jan 10, 2012 at 1:22 AM, gary <lists at lazygranch.com> wrote:
> With that amount of gain, I would assume they don't have to be low noise,
> though they could be. That is, I assume they are designed for use with an
> amplified antenna. [The noise margin should be set by the antenna preamp,
> not an amp down stream.]
>
> But then again, they would have to pass DC to the actual amplified antenna,
> as well as work as a 10dB amp.

I pulled the cover plate off and looked.  It is very simple inside.
The DC is from the receiver is blocked by a cap and there is an
inducter to take DC off the line.    The amp looks to be maybe some
kind of op-amp that drives a single transistor.   I can't read the
part numbers on any of the active components.

We know it is a line extender so the 10dB guess is reasonable

Chris Albertson
Redondo Beach, California

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