[hpsdr] CASMIR Microdesign v3.6

[KD5NWA wrk]

Worse yet look at the switching speed, it's not very fast.

On Fri, 2006-07-07 at 12:59 -0700, Ray Anderson wrote:
> ***** High Performance Software Defined Radio Discussion List *****
> 
> 
> >Dear Alex,
> 
> >I am wondering if the PI5V331 chips are so suitable for UHF and above..
> 
> >why not using hittite switches? They go DC to xx GHz.. depending on the
> 
> >one you choose.. for instance 8-fold switch for DC to 2.5 GHZ:
> 
> >http://www.hittite.com/product_info/product_specs/switches/hmc253qs24.p
> df
> 
> >including 3 to 8 TTL decoder. And: +5V single supply and user friendly 
> >package (this SMD package still has leads :) )
> 
> >73s Achim, DH2VA
> 
> Achim-
> 
> The Hittite switch chip you reference may be applicable as an RF switch
> to route the outputs of the AD8345/49 chips to the BPF's but I think the
> internal 50 ohm loads in the chip will make it inappropriate for use in
> QSE service on the HF side as shown in the CASMIR block diagram. Someone
> correct me if I'm wrong.
> 
> -Ray	WB6TPU
> 
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