Jim & Group,
Yes some of the stock roofing filters are four pole. I believe there are
some six pole filters as well. I'm NOT going to open my ORION again to
check to be sure.
You can either select a fixed roofing filter in MENUS or just let the
radio select the correct filter to match the DSP bandwidth
automatically. The two narrow filter positions have a center frequency
adjustment so that all filters can be centered in the bandpass all the
way to to the 100 hz DSP filter setting.
While in "auto" there is no significant change in signal level from any
of the filter positions even though each roofing filter probably has a
different insertion loss. There is also no noticeable filter ringing
even at 100 hz BW. In short, you can have HiFi AM/SSB or super sharp
selectivity for CW and digital modes and everything in between. The
system works very well.
Bill - K6WLM
Jim Reid wrote:
> Yes, I have been sent a photograph of the "stock"
> filter area within an Orion. Those ARE only 4 pole
> filters!! So they are "special" design for use only
> as roofing filters.
> What is also interesting, the 15kHz filter is NOT in
> that area. Probably as in the RX-340, elsewhere
> in the front end of the rig, and perhaps, always
> in series with whatever other roofing filter has
> been selected. And sure enough, the optional
> filters slots are ONLY for optional filters of the
> higher count pole sort. Very interesting indeed,
> at least to me, to only learn of these design details
> this late in time...........
> 73, Jim KH7M
> PS: Saw the UPS truck leaving my neighborhood early
> this afternoon as I returned from a quick trip to the
> hardware store. My heart skipped a beat as I thought,
> just maybe...........but, no; he had not stopped at my
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