[TenTec] Orion vs Orion II DSP Filters

Carl Moreschi n4py3 at earthlink.net
Wed Dec 12 21:55:47 EST 2018

The roofing filters between the Orion and Orion II are physically 
different.  But the job of roofing filters is not critical for 
selectivity.  The roofing filters are for the 2 khz dynamic range.

The DSP filters are the same for the 2 radios if you are using version 2 
or later firmware.  The difference comes in for the Orion where you can 
run version 1 firmware.  In version 1 firmware, the DSP filters were 
designed by Doug Smith and these filters have different characteristics 
than the version 2 and later DSP filters designed by Gary Barber.

PA5MW has found that the Version 1 filters have less ringing at very 
tight bandwidths.  Just remember that version 1 firmware is not 
available for the Orion II.

I do remember for a while when version 2 came out a lot of people 
preferred version 1 firmware.

Carl Moreschi N4PY
58 Hogwood Rd
Louisburg, NC 27549

On 12/12/2018 9:48 PM, Kim Elmore wrote:
> Based on what I read from N4PY and PA5MW, I'm confused about the
> difference between the DSP filters in the Orion and Orion II (I have the
> Orion II). Are the the most current firmware Orion filters essentially
> the same as the most current firmware Orion II filters? If different,
> can those difference be succinctly described?
> Kim N5OP
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