[time-nuts] Test Equipment

John Miles jmiles at pop.net
Fri Jan 22 01:23:02 UTC 2010


You could also get really hardcore and build the VNA described in DUBUS
4/2009 by HB9TXV.  Very nice piece of work, usable to 30 GHz.

-- john, KE5FX

> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> Behalf Of Lux, Jim (337C)
> Sent: Thursday, January 21, 2010 3:44 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Test Equipment
>
>
> > -----Original Message-----
> > From: time-nuts-bounces at febo.com
> [mailto:time-nuts-bounces at febo.com] On Behalf Of Gerhard Hoffmann
> > Sent: Thursday, January 21, 2010 2:50 PM
> > To: Discussion of precise time and frequency measurement
> > Subject: Re: [time-nuts] Test Equipment
> >
> > Lux, Jim (337C) wrote:
> > > What frequency ranges?
> > > If you are interested in <60MHz, then something like the
> TenTec TAPR VNA
> > > ($600) connects to a PC or a mac.  Works as a signal
> generator and as a 2
> > > port VNA.
> > >
> > >
> > Or this one:
> > http://groups.yahoo.com/group/VNWA/
> > (DG8SAQ)
> >
> > Excellent to 500 MHz, quite usable to 1300 MHz.
> > Does 6 or 12 term error correction, most of this VNA is software.
> > I'm just using one to tune a 100 MHz oscillator with opened loop.   :-)
> >
> > The only drawback is that one cannot measure compression
> > because the absolute levels vary over f.
> >
> > But then it can embed / de-embed, virtual match, display the Q
> > and equivalent circuit of a crystal from S11 measurement,
> > L, C, time gating and and and.
> >
>
>
> Outstanding.. that one is very competitive in price (using a
> ballpark $2/GBP conversion) to the TAPR one.
>
> I'm glad that more of these are becoming available (as assembled
> units, not as kits..)
>
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