Hi Buck,
Primarily cost. The 5 pole is significantly less expensive, but has a
wider shape factor.
73, Eric
_..._
[EMAIL PROTECTED] wrote:
In a message dated 9/13/2007 7:01:15 P.M. Eastern Daylight Time,
[EMAIL PROTECTED] writes:
The differences in filter loss are made up automatica
The differences in filter loss are made up automatically in the DSP, and
we have a good enough noise figure in the front end that the overall
sensitivity of the RX does not change significantly.
73, Eric WA6HHQ
[EMAIL PROTECTED] wrote:
Presumably, the 8 pole filter would have steeper sk
Presumably, the 8 pole filter would have steeper skirts but a higher
insertion loss than the 5 pole filter.
Don't know how it will play out in the real world. I decided to wait on
ordering roofing filters until more is known.
Craig "Buck"
k4ia
Fredericksburg, Virginia USA
***
Hi Bill,
I've added the 1.8 kHz 8 pole filter plot to the web page. Its 6 dB b/w
is 1.913 kHz and the shape factor is 1.5
We just measured the following in the lab:
The 200 Hz 5 pole filter -6 dB b/w is 224 Hz (200 Hz at -3 dB). Its
shape factor is 4.0.
The 500 Hz 5 pole filter -6 dB b/w
I take it from the comments so far that these are pretty good. :) As
someone who knows more about PHP than IMD, could you give us the "for
dummies" version?
As someone whose main interests will be QRP PSK31 and CW, not serious
contesting, which if any of these narrower filters would I benefit
from
Thanks...I almost I have enough to
finalize my order. Please fill in the blanks:
Filter BW Shape Factor
200
250 370 2.1
400 435 2.1
500
100010631.6
1800
2700
280028881.6
*All data taken from 8-pole plots...n
Here you go! These are recent measurements from our lab.
Filter20kHz 10kHz 5kHz 2kHz
200 Hz, 5 pole100+ 100+ 100+ 95
250 Hz, 8 pole100+ 100+ 100+ 95
400 Hz, 8 pole100+ 100+ 100+ 95
500 Hz, 5 pole100+ 100+ 100+ 94
1 kHz, 8 pole 100+ 100+
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