ngen White Noise Generator

[Thomas Herold]

Hello,

Anybody knows about how to increase the max. frequency on the ngen white noise generator. There are other amplifier ships available which reach up to 8Ghz. Does changing the chip to a better one increase the max. frequency.

Thomas Herold




_______________________________________________
Join Excite! - http://www.excite.com
The most personalized portal on the Web!
_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Don Wilhelm-3]

Thomas,

I don't know the design details, but I have a good suspicion that the top
frequency limit of the MAR-1 MMIC amplifier exceeds the noise characteristic
of the noise generating diode (D2) and the circuit board layout limitations.
For more information on calibrated noise sources, take a look at the 2005
ARRL Handbook starting on page 25-27, there is one design there that may go
as high as 2.5 GHz with critical construction techniques and using chip
resistors and capacitors.

73,
Don W3FPR

> -----Original Message-----
>
> Anybody knows about how to increase the max. frequency on the
> ngen white noise generator. There are other amplifier ships
> available which reach up to 8Ghz. Does changing the chip to a
> better one increase the max. frequency.
>
> Thomas Herold
>


_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Robert Friess]

Hi Thomas,

I designed the nGen for Elecraft and will try and answer your question.  The
high frequency output is limited primarily by the use of thru-hole
components and layout.  It actually produces significant noise output well
past 1 gHz but gradually rolls off from the rated 500 MHz.  Changing the
mmic alone is unlikely to significantly improve the high frequency response.

73,
Bob, N6CM

----- Original Message -----
From: "Thomas Herold" <[hidden email]>
To: <[hidden email]>
Sent: Monday, March 07, 2005 11:50 AM
Subject: [Elecraft] ngen White Noise Generator

>
> Hello,
>
> Anybody knows about how to increase the max. frequency on the ngen white
> noise generator. There are other amplifier ships available which reach up
> to 8Ghz. Does changing the chip to a better one increase the max.
> frequency.
>
> Thomas Herold
>
>
>
>
> _______________________________________________
> Join Excite! - http://www.excite.com
> The most personalized portal on the Web!
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>
>

_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com