[time-nuts] fast edge, rise time.

Bill Reed breed at otelco.net
Wed Jan 15 13:15:24 EST 2014


Thanks Mark

I must have serial number 2 of that series of IPG's. The one in the article 
is SN-3-75-1 and mine is SN-3-75-2.
It was probably fabricated in March 75.
I plan on visiting Redstone library to look up references 8 and 9.

Bill

-----Original Message----- 
From: Mark Kahrs
Sent: Tuesday, January 14, 2014 12:02 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] fast edge, rise time.

You might be interested to know this was discussed in a paper by Jim
Andrews (founder of Picosecond Pulse Laboratories):

http://www.nist.gov/calibrations/upload/im-25-4.pdf

>From the age of the paper, I'd say this generator is probably more than 40
years young.



On Mon, Jan 13, 2014 at 2:22 PM, Bill Reed <breed at otelco.net> wrote:

> Hi,
>
> Since there is no interest in my pulse generator maybe one of you knows
> someone at NBS who can provide a schematic of the generator.
> It has " NBS Impulse Generator   SN 3-75-2 " engraved on the front panel
> and is ~ 10 x 16 x 17.
>
> Thanks,
> Bill Reed
>
> -----Original Message----- From: Bill Reed
> Sent: Tuesday, January 07, 2014 7:53 PM
>
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] fast edge, rise time.
>
> Hi,
>
> Since you guys are interested in fast pule generators, I have one you may
> be
> interested in.
> I got it in govt. auction about 25 years ago for ~ $ 50.00. I will sell it
> to anyone for  $ 50.00 plus shipping.
> I prefer to sell to someone who will restore and use it rather than 
> parting
> it. It has more than $ 50.00 parts in it.
> There are a 30 turn 6.5 inch diameter hard line, wide band hybrid coupler,
> diode assembly and several adapters and attenuators.
> I believe the hard line discharges into a step diode. The power supply
> includes 200 V plus other voltages.
> If I remember correctly ( I have no high speed scope now ) the pulse is 2
> nanoseconds wide with a 280 picosecond rise time and and 2.5 Vpp.
> I checked with a 200 MHz digital scope and can see a pulse that verifies 
> my
> scopes bandwidth. The rate generator works but has problems.
> See facebook (reedbn at otelco.net) for pictures under Impulse.
>
> Bill Reed        256 586-3446
>
> -----Original Message----- From: ct1dmk
> Sent: Sunday, December 29, 2013 7:36 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] fast edge, rise time.
>
> Thank you all for your comments on this subject.
> Happy new year.
>
> Luis Cupido.
> ct1dmk.
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