[Test-Equipment] LF Ailtech 7514 and noise sorce

[Brooke Clarke]

Hi John:

Yes, and in addition the VSWR comes into play.  It's good to pad down the noise 
source with a 10 (or better 20) dB pad both to lower any spikes and also set 
the VSWR.

Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.precisionclock.com
http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Cam

J Forster wrote:
> If you are planning to use the noise source with solid state devices (very
> likely) you need to be really careful of spikes from gas tubes which can blow
> input stages.
> 
> Also, calibration of the ENR of a noise source without a known good standard is
> distinctly non-trivial. I basically assume a SS noise source is either good and
> essentially in calibration, or very sick, so test them by comparing an unknown
> source to several others. If they all correspond well, IMO they are likely all
> OK. In fact, all of the AILs I have seen are good. I've never seen a bad one and
> have bought all mine surplus.
> 
> Best,
> -John
> 
> 
> 
> Brooke Clarke wrote:
> 
> 
>>Hi Chris:
>>
>>The 5722 tube was designed to generate noise from DC through 500 Mhz, see:
>>http://www.prc68.com/I/NSLB.shtml
>>
>>The other way is to use a zener or better a noise diode.
>>
>>The advantage of the 5722 is the noise is a function of the plate current.
>>
>>Have Fun,
>>
>>Brooke Clarke
> 
> 
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