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K3 Filter IMD numbers

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Bill W4ZV

K3 Filter IMD numbers

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
1000 1063 1.6
1800
2700
2800 2888 1.6

*All data taken from 8-pole plots...nothing
available for 5-poles filters or the 1.8 8-pole.

73, Bill W4ZV

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Eric Swartz - WA6HHQ

Re: K3 Filter IMD numbers

Administrator

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 is 565 Hz (465 at -3 dB). Its shape
factor is 3.1.

The 2700 Hz 5 pole filter -6 dB b/w is 2.91 kHz (2.71 at - 3 dB). Its
shape factor is 2.9.

As one would expect, the shape factors of the 5 pole ladder filters are
broader than the 8 pole filters.

73, Eric WA6HHQ
-----------------

Bill Tippett wrote:

>
>
> 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
> 1000 1063 1.6
> 1800
> 2700
> 2800 2888 1.6
>
> *All data taken from 8-pole plots...nothing
> available for 5-poles filters or the 1.8 8-pole.
>
> 73, Bill W4ZV
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>
>

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Buck - k4ia

Re: K3 Filter IMD numbers

In reply to this post by Bill W4ZV

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

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Eric Swartz - WA6HHQ

Re: K3 Filter IMD numbers

Administrator

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

----

[hidden email] wrote:

> 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
>
>
>
>
> ************************************** See what's new at http://www.aol.com
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>
>
>

Eric Swartz - WA6HHQ

Re: K3 Filter IMD numbers

Administrator

In reply to this post by Bill W4ZV

Hi Buck,

Primarily cost. The 5 pole is significantly less expensive, but has a
wider shape factor.

73, Eric

_..._

[hidden email] wrote:

> In a message dated 9/13/2007 7:01:15 P.M. Eastern Daylight Time,
> [hidden email] writes:
>
> 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.
>
> So why bother to offer both a 5 pole and 8 pole filter?
>
> k4ia
> Craig "Buck"
> Fredericksburg, Virginia USA
>
>
>
> ------------------------------------------------------------------------
> See what's new at AOL.com
> <http://www.aol.com?NCID=AOLCMP00300000001170> and Make AOL Your
> Homepage <http://www.aol.com/mksplash.adp?NCID=AOLCMP00300000001169>.

Tom-5

FS: K2, KSB2,KAT2, XV60

In reply to this post by Eric Swartz - WA6HHQ

Elecraft K2, 10 watt version, with built in 20 watt antenna tuner (KAT2),
the SSB Module (KSB2) and the XV60 transverter interface module.
This is serial # 5050, with all updates.
Price is $ 750, US and Canada only, and I pay for shipping UPS Ground,
insured.
No microphone, but power cord and all manuals are included.
I accept Paypal, bank money order or US postal money order

Tom K8TB (k8tb at bosscher.org)

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