Read the description of yjr syntheized might be on rfsquared,
----- Original Message -----
From: "Ken Brown" <ken.d.brown@verizon.net>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Friday, July 22, 2005 20:00
Subject: Re: [TenTec] Orion - Questions
> I have some questions for those who have Orion documentation, or know a
> lot more about the Orion and may be able to confirm or deny a few of my
> perhaps naive assumptions. Here are my naive assumptions:
>
> 1) Every oscillator in the Orion is either a DDS oscillator or a
> digitally controlled PLL oscillator. So that data loaded into some DDS
> or PLL circuit is what determines the output frequency of those
oscillators.
>
> 2) The Orion is a firmware upgradeable radio.
>
> If those two things are true, why is not the following so easy to do as
> to be called trivial? I would think that one of the great cost savings
> advantages of a firmware controlled radio would be that they could use
> filters with a greater tolerance of center frequency, therefore making
> fewer of the crystal filters coming off the production line rejects.
>
> Shoot, even my Kenwood TS-440, bought in 1988, had some DIP switches
> inside that I thought were used to move the BFO to just the right places
> on the SSB TX filter skirts. Yes they have a lot of phase noise, but the
> TX and RX frequency readout was always correct. That was seventeen years
> ago. I know the Orion must be quieter and a better receiver, but is it
> not also more flexible with respect to filter center frequencies that a
> 17 year old JA rig?
>
> >It's not that simple because Orion's firmware
> >expects the old 500 and 250 slots to use 9.000750
> >MHz center frequency instead of the 9.001500 MHz
> >the first bank filters use. The filters would
> >not be centered unless there were an internal
> >firmware change, and I doubt Ten-Tec would want
> >to do that since then the 500 and 250 slots would
> >not be IF centered. Good idea but the different
> >IF frequencies for the first versus second filter
> >banks would not allow it.
> >
> Just curious,
>
> DE N6KB
>
>
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