[Test-Equipment] Help ID NBS (aka NIST) Noise Source

[Carl]

In 1964 the 5722 noise diode tube was still popular and worked reasonably 
well to low UHF frequencies. I still have a 5722 source I built in the 70's 
that is used at high HF and low VHF as a quick check of various projects as 
it is a heck of a lot faster than punching in all the codes into the HP 
4970A and taking chances with the matching source.

Having worked in RF in the greater Boston area for decades I vaguely 
remember that company name but have no other info. Many folded or merged 
during the 1968-69 recession which hit RF companies in this area especially 
hard.

Carl
KM1H


----- Original Message ----- 
From: <GandalfG8 at aol.com>
To: <test-equipment at mailman.qth.net>
Sent: Monday, January 04, 2010 4:16 AM
Subject: Re: [Test-Equipment] Help ID NBS (aka NIST) Noise Source


>
> In a message dated 04/01/2010 06:07:17 GMT Standard Time,
> sacramento.cyclist at gmail.com writes:
>
> It was apparently made by Aerospace Research Inc. of  Boston,
> Mass.  There is a date on the inside meter case of May,  1964.  The
> dynamo label on the front panel says checked in 1971.   I can find no
> mention of that company anywhere.  Anyone know what  became of
> Aerospace Research?  Before I opened it up, I figured it  would have a
> tube.  But, I don't think it does...unless there is a  very small one
> inside the internal cage which you can see against the front  panel on
> the inside.  Over all, the thing is in remarkable  shape.  The range
> switch is quite stiff though.  I have not tried  to power it on.
>
> If anyone recognizes this  thing, please let me know.
>
> Have a  look.
>
> -- 
> I've been wondering lately..."Where am I going and why AM  I in this
> hand basket??"
>
>
> --------------------
> Hi Moses
>
> A quick Google returns this link, different unit but pretty  similar.....
>
> _http://www.prc68.com/I/NSLB.shtml_ (http://www.prc68.com/I/NSLB.shtml)
>
> As per Brooke's comment, I would expect it to use a noise diode, perhaps
> inside the cage behind the output connector, which probably leaves the 
> grey
> rectangular module as being a screened line transformer.
>
> Just guessing though, never seen one before, if you email Brooke via the
> site perhaps he could point you towards more information.
>
> regards
>
> Nigel
> GM8PZR
>
>
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