[hpsdr] JANUS: Update on Alpha

[Ahti Aintila]

Correction to my message! I should have referred to Figure 9., page
19. The gain has to be adjusted so that QSD and AK5394A are saturating
at the same time.
73, Ahti OH2RZ


On 09/05/06, Ahti Aintila <oh2rz.sdr at gmail.com> wrote:
> Lyle,
>
> Naturally we should use balanced buffers as suggested in the data
> sheet(2005/05) Figure10. page 20. My selection for the buffer is
> OPA4227 that is unity gain stable and has noise density 3 nV/sqrtHz.
>
> I have been planning to rip off INA163 from the TRX board  and use
> OPA4227 instead with low gain. We have to remember that QSD can handle
> maximum 4 Vpp and AK5394A can stand 2.44 Vpp.
>
> The local Asahi Kasai dealer in Finland can deliver samples, so I
> assume that samples are available in the USA, too.
>
> Good luck for the experiments,
> Ahti OH2RZ
>
>
> On 08/05/06, Lyle Johnson <kk7p at wavecable.com> wrote:
> > Hello Ahti!
> >
> > > I am very excited in hearing the news and testing results. AK5394A is
> > > my favorite choice.
> >
> > Any tips on how to best apply it, input amplifiers, etc?  Currently
> > adapting the datasheet design...
> >
> > Lyle KK7P
> >
> >
>

 1147125359.0