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Because they can sell you the buck in parts for $100 or more without paying a middle man. Just a hunch.
On Tue, Jan 14, 2020 at 9:45 AM Clay Autery <KY5G@...
Thanks for the response Mr. Sherwood!
But I am inquiring as to why Elecraft decided to make the
6-pole 400Hz part rather than stay with the INRAD 8-pole
filters? Like the Elecraft branded "by INRAD" 8-pole 400Hz
filter I bought with my K3s in 2016.... Appears to be a
co-branded version of INRAD's #701.
Clay Autery, KY5G
On 01/14/20 09:15, Rob Sherwood wrote:
The reason for the 6-pole filter vs. the 5-pole filter was for
much better (less) passive IMD in the roofing filter. Some 5-pole
filters limited the close-in dynamic range of the K3 to the mid 80
dB instead of better than 100 dB. Passive IMD can occur in many
components, including crystals. My testing prompted the new
filter. Rob, NC0B
On Jan 14, 2020, at 6:16 AM, Bill
Maddock via Groups.Io <n4zi96@...>
Yeah probably cost savings , doubt there’s a lot of
difference if any that you would notice. Several years ago I
switched out my 200 hz filters in both my K3’s. They had the
standard 5 pole filters and I upgraded to 6 pole. I couldn’t
really tell difference on recieve. I compared had one 5 pole
and other 6 pole and couldn’t tell difference. Probably wasted
the money . I still have original 5 pole- hope to sell them
one day lol
73 de Bill WW5M
On Tuesday, January 14, 2020, 6:46 AM, Clay Autery
Probably not something I will ever notice EVEN
IF/WHEN I finally get set up for diversity
receive... But it really bothers me that they are
"different" in a fundamental way.
The curse of borderline OCD... <wink>
73, and thanks for the response!
Clay Autery, KY5G
01/14/20 06:32, Bill Maddock via Groups.Io wrote:
As far as diversity receive, the 2 different
filters should work fine. The offset on 6 pole
will guaranty that both signals are on same
frequency and have same tone. As far as one being
8 pole and the other 6 pole, yes the curve on the
filter will be different. I doubt very seriously
that it will hurt the diversity recieve.
73 Bill WW5M
On Tuesday, January 14, 2020, 6:26 AM, Everett
N4CY via Groups.Io
Vibroplex bought INRAD, that is
why it now has the Vibroplex name.
> On Jan 14, 2020, at 6:15 AM, Clay Autery