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Re: [Amps] Splatter View RF Sampler Anyone Used It?

To: <vtnn43e@comcast.net>, "Amps Reflector " <amps@contesting.com>
Subject: Re: [Amps] Splatter View RF Sampler Anyone Used It?
From: "Tom Rauch" <w8ji@contesting.com>
Reply-to: Tom Rauch <w8ji@contesting.com>
Date: Mon, 10 Sep 2007 11:06:01 -0400
List-post: <mailto:amps@contesting.com>
> Found this interesting product while looking at reviews on 
> eham. Has
> anyone used one of these? Is it worth the money?
>
> http://www.cleanrf.com/ "Now, a real-time signal 
> comparison between
> your amplifier's various pre and post operating conditions 
> can be
> achieved."


Zack,

These devices appear to have one detector and a RF sampler 
(or two detectors) that feed a scope, allowing the display 
to track the input level vs. output level of the amp. 
Depending on the sampling method you would either have a 
single line (with two detectors) or a trapezoid (with one 
detector and one RF sample).

It certainly is a good idea  to aid in tuning. Collins did 
something similar with a meter.

Of course it really isn't proof of bandwidth. A more 
accurate description is systems like this allow you to 
optimize amplifier tuning for best average linearity.

There are two caveats:

1.) Even though the input doesn't follow the output in a 
fixed proportion or ratio, that still doesn't mean the 
amplifier is generating harmful odd-order products.

2.) It's also possible to have unacceptable odd-order 
products or bandwidth and not be able to clearly see them in 
a test like this.

Of course you could certainly tune closer to optimum and see 
gross problems like flat topping easier with a system like 
this, or even tune on the fly while talking.

Just remember the only thing that really checks or assures 
proper bandwidth is something that actually measures 
bandwidth. :-)

73 Tom 


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