I have just completed my K3 Kit, S/N 01817, and installed the stock 2.8 kHz
filter and the 8-pole 2.1 kHz filter. Thinking these would handle my SSB needs
for the beginning. I plan to also operate Rtty and digital modes, and I wonder
if there are suggestions for the best filters. I think
Have you seen this:
http://www.elecraft.com/K3/Roofing_Filters.htm
-jeff
W7BRS
On Tue, 28 Oct 2008, Fred Wolf wrote:
Anyone have a preference? For Rtty, are the cw filters too
narrow? Any advise is welcomed.
Fred Wolf
[EMAIL PROTECTED]___
on CW.
73,
... Joe, W4TV
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Fred Wolf
Sent: Tuesday, October 28, 2008 11:26 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] K3 Filter Advice
I have just completed my K3 Kit, S/N 01817
Thanks to everyone for their comments on filters for a CW+AM K3. They
are very helpful.
I was aware of the distinction between roofing filter and DSP
filtering but didn't know (or forgot) about the 2.7 kHz standard
filter.
As for the hoped for multi-bandwidth filter, I guess it is probably
I'm wondering what minimum complement of filters would work for me in
a K3. I am only interested in general coverage reception of SWBC
stations, plus operating CW. I am a little unlclear about what filter
would be required for AM (reception only), with the KBPF3 option.
For CW I generally prefer
There were many great posts about the filter options. Thanks to all who
provided good advice. I read all of them. This is my take on all of the
postings about filters.
1. The shape factor of a roofing filter is not as important as the shape
factor of a conventional main IF filter. Therefore,
Drew,
For AM you will need either the 6 kHz or the 15 kHz filter - an AM
signal will not fit through the 2.7 kHz filter without seriously
degrading the fidelity.
The 2.7 kHz filter along with the DSP filtering does an acceptable job
for casual CW, but if a strong (S-9+30) station comes on
would actually have to do
some hands on to be sure you like the result.
O.K. That's my answer. I bet you get several others.
Dave W7AQK
- Original Message -
From: [EMAIL PROTECTED]
To: Elecraft@mailman.qth.net
Sent: Wednesday, December 26, 2007 8:36 AM
Subject: [Elecraft] K3 Filter
John W2XS wrote:
The biggest problem will come
when trying to listen to a weak station who is near another station with a
noisy transmitted signal.
Since I've had my K3 I've become even more aware than before that a
couple of ham neighbors (within a mile) are radiating really awful crap
Don Wilhelm wrote:
For AM you will need either the 6 kHz or the 15 kHz filter - an AM
signal will not fit through the 2.7 kHz filter without seriously
degrading the fidelity.
True enough -- but if you are a SW DXer trying to verify the ID of a weak,
rare SWBC station, and therefore not
WU7R:
I didn't order any filters not knowing which ones to order.
Since Elecraft has now posted the data I needed, here's what
I'm probably going with:
Main RX: 2.7k stock, 1.8k 8-pole, 500 Hz 5-pole
Sub RX: 2.7k stock, 500 Hz 5-pole
My reasoning is that the 1.8 will be
WU7R:
I didn't order any filters not knowing which ones to order.
Ci I ordered my K3 on May 1 but have not placed
a filter order yet. Elecraft promised to post full IMD/BDR
measurements for all filters but has not done so thus far.
As you probably know, ARRL discovered IMD problems
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