[time-nuts] Dist Amps Questions

W2HX w2hx at w2hx.com
Fri Apr 22 01:31:25 UTC 2011


Thx!!

73 Eugene W2HX


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Bruce Griffiths
Sent: Thursday, April 21, 2011 9:21 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Dist Amps Questions

David VanHorn wrote:
> /worry || be_happy.
>
>
>
> 1.       50/75 ohm question.  I know that putting 50 ohm source into a 75
> ohm device will cause SWR. I know that the total power delivered to the
> device will be the difference between forward power and reflected power.
So
> that doesn't seem bad, just might have a lower power input into the DA.
> However, what about distortion? Will the sine wave be distorted somewhat?
> And what if any adverse effect could a distorted sine wave have on various
> instruments using the 10 MHz reference?
>
>    
The distortion depends on the output stage design.
Emitter follower and similar output stages have lower distortion for 
high impedance loads.
current source output stages tend to have lower distortion for low 
impedance loads.

Bruce

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