These are Analog Devices.
73
Bob K4TAX
----- Original Message -----
From: "Jim Reid" <jimr.reid@verizon.net>
To: "Duane Grotophorst" <n9dg@yahoo.com>; "Ron McKean"
<wd5fun@earthlink.net>; "N1EU" <n1eu@yahoo.com>; <tentec@contesting.com>
Sent: Thursday, February 28, 2002 7:58 PM
Subject: Re: [TenTec] Orion prototype
> Duane has suggested:
>
> > Nothing in those two sentences implies that the main
> > RX will not be DSP based, in fact plainly says it will
> > have DSP. I interpreted his comment to reflect that
> > there will be a mix of analog elements and DSP in the
> > IF chain. Much the same as Ten Tec's DSP radios to
> > date already are. This makes good sense because 130+
> > dB dynamic range A/D devices are rather rare or at
> > least very expensive. I'm sure that much of the
> > top-notch performance will come from choosing more
> > capable analog devices in the RF/IF chain before the
> > signal gets digitized.
>
> The RX-340 manual lists manufacturer's part numbers for
> the D/A and A/D converters, surface mount IC's, but
> not a manufacturer's name. Part numbers are:
>
> A/D on boaard 81790, AD7872JN
>
> D/A, same board, AD7840JN .
>
> Does this info tell us anything about the dynamic range
> of these devices in the 340, if you can ID the manufacturer?
>
> > There are several really low phase noise synthesizer
> > chips out there already that rival crystals.
>
> The synthesizer chip in the 340 is Motorola part
> MC145170D1; is this the same as the Pegasus/K2?
> The first LO in the 340 is a three loop architecture
> synthesizer. There are two 10 MHz TCVCXO crystals
> on this board (81772). They have manufacturer's
> part numbers of VTXO14010G and the other
> DFA20-HAV10MHZA1 if these part numbers will shed
> any more light on what is going on, hi.
>
> I could post the circuit description of the entire 81772
> board from the 340 manual, if that would be of interest/
> help to this discussion of what we might see in the Orion.
>
> > Did you realize that the K2 and Pegasus/Jupiter share
> > the same Motorola synthesizer chip? One has exemplary
> > phase noise specs and the other is mediocre by today's
> > standards.
>
> 73, Jim KH7M (and using the Pegasus/RX-340/N4PY system)
>
>
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