OK folks.
That makes good sense to me. I have been arguing the consequences of
using a wide filter mainly to enhance awareness of the facts as I know
them. I really have only sketchy information at this point (no
'hands-on experience), so my response is theoretical and based on a few
pieces of information that Wayne has provided both on the reflector and
privately.
The real facts are: 1) I will order my initial K3 with only the stock
2.7 kHz filter. Everything else will have to be add-ons - this is a
necessity based on my ham radio budget at this time (taxes have just
been recently paid and insurance is due!).
2) there is promise of a variable bandwidth filter in the works. I will
wait to see what it will provide before ordering any other filter. I
expect the variable filter may be of the Cohn design which is great for
CW and SSB, but may not meet my needs for group delay since I am
interested in performance with data modes. The rounded nose of several
of the filters shown in one of the references Eric made do hold promise
for a good group delay characteristic, but my guess is only a guess,
further information is necessary.
My best recommendation at this time: Understand the consequences of
depending on a wide roofing filter while making your decisions - if you
choose only the wide filter, live with it for a while. Additional
filters can be ordered after determining your individual needs, so if
you find yourself in a situation where a more narrow filter will be
beneficial to your operation, order it at that time. Someone else's
operating experience and priorities may not be equal to yours. The
information I have so far is that the major benefit to a narrow roofing
filter is substantial reduction in AGC 'pumping'.
73,
Don W3FPR
Martin AA6E wrote:
Don, the voice of sanity...
As an Orion owner considering the K3, I am aware of quite a few folks in
the Orion world who assume that ordering their rig with "all the
filters" is going to be better than taking the standard factory option
(4 filters: 1, 2.4, 6, and 20 kHz).
In fact, extra roofing filters only help you when you're working in very
hostile band conditions, like contesting. For normal mortals (me), the
standard filters have been fine.
Whether the K3 would need more than one roofing filter completely
depends on your operating style, in my opinion. So, if in doubt, it's
very reasonable to start with the one standard filter and add more as
needed.
If you add the second receiver, I think you have to decide all over
again which filters you want to add to _it_. (I assume the first and
second Rx do not have to be equal. One may have the general coverage
option, for example, and the other not.)
I certainly like the modular approach that lets you ease into the K3
world at a reasonable cost.
73 Martin AA6E
Don Ehrlich wrote:
> I ordered mine with no crystal filters. They can always be installed
later and by then I will have learned enough to know what I really want
or need.
> And ... I know I am not wasting my money with a hasty decision.
>
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