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Path: utzoo!mnetor!seismo!mcnc!unccvax!dsi
From: dsi@unccvax.UUCP (DataSpan R+D)
Newsgroups: rec.ham-radio,sci.electronics
Subject: Re: HP 608D Signal Generator Documentation
Message-ID: <689@unccvax.UUCP>
Date: Thu, 23-Apr-87 11:30:40 EST
Article-I.D.: unccvax.689
Posted: Thu Apr 23 11:30:40 1987
Date-Received: Sat, 25-Apr-87 09:46:00 EST
References: <870@oakhill.UUCP>
Organization: Univ. of NC at Charlotte, Charlotte, NC
Lines: 34
Keywords: Signal Generator
Xref: mnetor rec.ham-radio:1265 sci.electronics:587

In article <870@oakhill.UUCP>, charlie@oakhill.UUCP (Charlie Thompson) writes:

> I had heard rumors that the generator *leaks* and that it will radiate
> levels in excess of .1 uv making it somewhat less useful at low output
> levels. I have two questions:
> 
>   2) Does anybody have any experience with this known-to-be-popular
>      signal generator.  Any suggestions on how to fix the radiation
>      *leakage* problem with some sort of modification.

    Mine definitely does not leak. (It, however, is the military version
which was made by several manufacturers).  The secret to getting this
thing not to leak is:

    1) The cover to the tuned oscillator and IPA must be absolutely RF
       tight.  This was before the days of "Sticky Fingers" and such. 
       Mine has an aluminum plate which mates into a cast chassis, the
       plate has a groove machined into it, which must be filled with
       silver plated braided copper or such.  My favourite is to get
       RG 174/U coax and pull the center conductor (including dielectric)
       out).

    2) ALL . . . repeat . . . ALL OF THE SCREWS MUST BE PRESENT IN THE
       COVER.

    3) The cable to the attenuator must be in good condition.

     The 608 and its various clones (which are identical) is a fine
piece of equipment.  I wish I'd a manual for mine, too.

David Anthony
DataSpan, Inc

P.S.  Does anyone know what XV3 is in a Tektronix 491 spectrum analyser?