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On 10/1/2010 11:37 AM, al sirois wrote:
> N1mhc@arrl.net
> Al sirois
> East Boothbay, ME
>
> -----Original Message-----
> From: Henry, John [mailto:jhenry@tentec.com]
> Sent: Friday, October 01, 2010 8:59 AM
> To: Discussion of Ten-Tec Equipment
> Subject: [TenTec] Eagle A few answers
>
> The DSP used in the Eagle is the ADSP21261 SHARC DSP, a 32bit DSP with
> 40bit floating point math, operates at 150MHz up to 900MFLOPS peak for
> some operations. The AKM4683 codec is 24bits. Plenty of horsepower
> and bits for what is needed for this feature level transceiver.
> A PIC chip is used for front panel controls, communications, overall
> system hardware control, etc, leaving all of the real audio processing
> performed by the DSP.
> VFO A and VFO B frequency and mode are remembered per band.
> The bandwidth and step size are remembered per mode.
> VFO B really only is a retainer place for a frequency, it follows the
> same mode/bandwidth as the main VFO does.
> When operating split, VFO B is always the transmit VFO, allowing you
> to have an offset frequency for transmit, it uses the same mode and
> bandwidth when swapped back to receive in VFO A and it will still use
> the same mode as in VFO A for transmit. Cross modeing is not available
> in the Eagle but it is available in the OMNI-VII and Orion series.
> The transmit bandwidth is always fixed, e.g. for CW or SB it will
> always be the 2.4kHz filter, for AM it will always be the optional
> 6kHz filter, and for FM it will always be the optional 12kHz filter,
> regardless of what you have the receive bandwidth set for. The
> transmit bandwidth in DSP is not adjustable either, it is always the
> same 2.4kHz, 6kHz, 12kHz scheme as above.
> Like the OMNI-VII, you can select any DSP bandwidth for any mode, up
> to and including the largest filter you have installed. You may ask
> "who needs 300Hz in SB", well, when using it in some digital modes,
> this is actually a very useful combination, switch to a very low DSP
> bandwidth, maybe adjust pbt if required, and knock out a lot of noise.
> As in the OMNI-VII, it has a single physical synthesizer, meaning it
> can only receive one signal at a time, its not a dual receiver, but it
> is a dual VFO so that you can transmit xhz up or down from the rx
> frequency.
> AM, You can always turn on AM mode, regardless of whether you have the
> 6kHz filter installed or not. However you cannot transmit AM unless
> you have the 6kHz filter installed.
> The same for FM, can listen at any bandwidth, even 300Hz (makes no
> sense, but you can), but you can't transmit unless you have the 12kHz
> filter installed.
>
> I'm sure the above will generate more questions, but that is what
> these boards are for.
>
> Thanks,
> John Henry
> TenTec Engineering
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