[TenTec] great RX320 review

[Bill Fuqua]

Sound cards today will provide a dynamic range of over 120 db anyway.
Looking at the schematic, there are 2 PIN diodes for gain control. One just 
after the Input lowpass filter and one on the output of the first IF 
(45MHz) they are controlled by a DC amplifier that gets its input from a 
diode detector following the  455KHz transformer just before the Mixer that 
converts down to DSP IF. So this AGC is just to prevent overload due to 
frequencies near the one being received.

73
Bill wa4lav


At 09:28 AM 6/10/2003 -0700, you wrote:

>Yes it does still have all the DSP stuff of its own,
>but the 12KHZ signal that is provided on the back
>panel is before any of the A to D and DSP of the
>RX-320 itself.
>
>However the DSP in the RX 320 will still have an
>effect on whatever analog AGC action that there may
>be. If I recall correctly a large part of the AGC of
>the RX-320 is handled in the DSP itself and only very
>strong signals will affect any of the analog AGC
>action, anyone know if this totally correct? What this
>means that the 12KHz signal will probably not be 100%
>AGC stabilized but instead for only the very strong
>signals.
>
>Duane
>N9DG
>
>
>--- Bill Fuqua <wlfuqu00 at uky.edu> wrote:
> > I thought the D was a regular RX320 with an IF out
> > added.
> > Still had the DSP stuff inside.
> >
> > 73
> > Bill wa4lav
> >
> >
> > At 02:22 PM 6/9/2003 -0700, you wrote:
> >
> > >That is exactly what the RX-320D is.
> > >
> > >http://www.tentec.com/TT320.htm
> > >
> > >It outputs the 12KHz IF signal on a newly provided
> > >jack on the back panel. Its main limitation is that
> > it
> > >will only provide for 2.5KHz tuning steps.
> > >
> > >Duane
> > >N9DG
> > >
> > >
> > >--- Bill Fuqua <wlfuqu00 at uky.edu> wrote:
> > > > I wonder if Ten Tec could produce a RX320 with
> > IF
> > > > output only to send to
> > > > sound card and not have the DSP stuff and audio
> > for
> > > > much less than the RX320. PC DSP IF is practical
> > now
> > > > up to 15 or 20 KHz.
> > > >
> > > > 73
> > > > Bill wa4lav
>
>
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