[hpsdr] Fw: mixers/QSD

[John B. Stephensen]

The Texas Instrument 74AUC series is also useful for mixers. There are
2.5-volt versions of their 74LVC and 74CBT 5-volt analog switches that
switch in 1.5 ns or less.

73,

John
KD6OZH

> ----- Original Message ----- 
> From: "Leon Heller" <leon.heller at bulldoghome.com>
> To: "John B. Stephensen" <kd6ozh at comcast.net>
> Sent: Sunday, June 11, 2006 08:35 UTC
> Subject: Re: [hpsdr] mixers/QSD
>
>
> > ----- Original Message ----- 
> > From: "John B. Stephensen" <kd6ozh at comcast.net>
> > To: "Lawrence Stoskopf" <stoskopf at tri.net>; <hpsdr at hpsdr.org>
> > Sent: Sunday, June 11, 2006 8:29 AM
> > Subject: Re: [hpsdr] mixers/QSD
> >
> >
> > > ***** High Performance Software Defined Radio Discussion List *****
> > >
> > > Resistive FET mixers with the source leads grounded (like the H-mode
> > > mixer)
> > > have the highest third-order intercept points today. Add an RF
amplifier
> > > and
> > > its similar to a 7360. Perhaps a LED/photodiode mixer would also work.
> >
> > Parametric mixers used to have good performance figures. I remember Pat
> > Hawker, G3VA, mentioning in his RadCom column many years ago that they
> could
> > handle several volts if pumped at a sufficiently high level.
> >
> > The Peregrine PE4140 FET mixer looks pretty good - 32 dBm IP3. I'll see
if
> I
> > can get a couple of samples out of their UK distributor. I've created a
> PCB
> > part for it, it's in a 6 lead QFN package with a grounded heat
conduction
> > slug and two more leads for that. It uses silicon-on-insulator on
sapphire
> > technology - quite exotic. They aren't all that expensive, about $6,
> > although they do need baluns and inductors which will push the price up.
> For
> > HF use, the baluns could be home-made.
> >
> > 73, Leon
> > --
> > Leon Heller, G1HSM
> > leon.heller at bulldoghome.com
> > http://www.geocities.com/leon_heller
> >
>