Folks,
the KFL3-FM filter seems to be hard to get, but Chinese copies of the CW
filters are available at fair prices.
There is a page with the schematics of all the "narrow" Elecraft filters
KFLxx-A but not for the -B FM filter.
I have an schematic for an LC filter in order to listen with wide
band
I have a KFL3B-FM filter that’s excess to my needs. Anyone interested?
Jim K4AXF
K3 SN4936
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You will have to choose which filter is used ALL THE TIME for SSB TX.
You COULD currently define the 2.1 filter as 2.7 and set an offset to
center it properly. BUT it will not be cleaner as you suppose. The
narrower filters have more envelope delay near the skirts, and that
creates distortion an
In fact, 2.1 was one of the original possibilities for the TX filter
and was removed.
73, doug
From: "Don Cunningham"
Date: Fri, 8 Oct 2010 11:31:04 -0500
I agree, Bob, and wouldn't 2.1 kc make our transmit signal even cleaner??
I'm afraid I don't see the "status quo" either.
73
I agree, Bob, and wouldn't 2.1 kc make our transmit signal even cleaner??
I'm afraid I don't see the "status quo" either.
73,
Don, WB5HAK
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[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Joe Subich, W4TV
Sent: Friday, October 08, 2010 11:07 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3: FM Filter for AM?
On 10/8/2010 9:30 AM, Don Wilhelm wrote:
>
> You can use the FM filter to receive AM, but not for transmit.
On 10/8/2010 9:30 AM, Don Wilhelm wrote:
>
> You can use the FM filter to receive AM, but not for transmit. To
> transmit AM, you must have the 6 kHz filter, so you will have to
> sacrifice one filter.
Repeating one of my complaints about the K3 there is no reason
that the FM filter sho
Don
I thought that that might be the case.
I can live without TX in AM (hi)
Vy 73
Bill
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Sent from the [K3] mailing list archive at Nabble.com.
Bill,
You can use the FM filter to receive AM, but not for transmit. To
transmit AM, you must have the 6 kHz filter, so you will have to
sacrifice one filter.
73,
Don W3FPR
On 10/8/2010 9:11 AM, Bill Henderson wrote:
> Hi
>
> I already have the 250Hz, 400Hz and 2.7 KHz filters fitted to bot
Hi
I already have the 250Hz, 400Hz and 2.7 KHz filters fitted to both
receivers. I plan to add 2.1KHz or 1.8kHz filters some time I in the future.
In the nearer future I intend adding the 2m module to my K3. Since this will
be used for local traffic I understand that I need to add an FM filter o
It must be my translation of english, but I thought FM was usually of
better quality then SSB, but maybe thats not want grown-up is?
So, if you want to enjoy the better quality of FM over the lousy small
bandwidth modes like SSB an/or CW then you need the filter.
Also useful for 10 and 6 meters
In a recent message, Jim Hester wrote ...
>
>I am waiting like many others for my K144XV. I wonder if I need to order a
>FM filter for use with the K144XV.
That all depends on whether you want to work on FM (CB!) or on the
grown-ups modes of CW and/or ssb.
73
--
David G4DMP
Leeds, England, UK
I am waiting like many others for my K144XV. I wonder if I need to order a
FM filter for use with the K144XV.
Jim Hester
K5HTK
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Thanks Joe,
Your reply arrived as I was typing my reply to my own original posting,
after having found the information in the archive!
Many thanks, it's clear in my mind now.
73 Stephen
On 16/10/2009 22:16, "Joe Subich, W4TV" wrote:
>
>
> The K3 DSP maxes out at 4 KHz on SSB and 2.8 KHz on
I have just realised my mistake. I can find no reference to it in the
manual but in searching the archives (again) I found a posting which
mentioned the 4.2kHz (AFAIR) bandwidth limit imposed by the DSP. So, it
would seem that things are working as they should- I was confused by the
filter setup
> From: elecraft-boun...@mailman.qth.net
> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Stephen Prior
> Sent: Friday, October 16, 2009 1:10 PM
> To: elecraft
> Subject: [Elecraft] K3: FM filter bandwidth in other modes
>
>
> I have just fitted the FM filter to finis
I have just fitted the FM filter to finish off my complement (now 13, 6,
2.7, 0.5 and 0.25). I used the K3 utility to set the bandwidth (13kHz) and
I have all the square boxes ticked (checked) so that, in my understanding I
should be able to go up to the full bandwidth of the filter in all my othe
Despite the recent posting citing a comment from 2007, just the other
week, Wayne indicated that you NEED the 6kc filter to transmit AM.
http://mailman.qth.net/pipermail/elecraft/2008-December/102373.html
de Doug KR2Q
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The problem is that when go 6 metres, select FM mode and press PTT, I get ERR
TXF,
I have the following set-up in CONFIG menu.
FL1 BW - 12.50
This must be 13 kHz
73,
Lyle KK7P
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You must
Chris,
I don't have the FM filter here, but as I recall, the filter bandwidth
must be set to 13 kHz - try it and see if it 'fixes' the problem.
73,
Don W3FPR
Chris Meagher wrote:
Hello,
Have just installled FM filter into slot 1.
Other filters are 2.7 in slot 3, 1.8 in slot 4.
Also just i
Hello,
Have just installled FM filter into slot 1.
Other filters are 2.7 in slot 3, 1.8 in slot 4.
Also just installed KVX3, all appears to be OK with that.
The problem is that when go 6 metres, select FM mode and press PTT, I get ERR
TXF,
which according to the manual p60 rev.c1-3, is incorrec
>>> "put on his smoking jacket and slippers, sit back
in his favorite armchair " <<<
Smoking Jacket. Ut-oh - not politically correct these
days. Now hey're called them "Cancer coats" - I think.
;-)
joking - AM is something less without DSB and a
carrie
Vic K2VCO wrote:
Stewart Baker wrote:
Now I know that it is worth making even a fairly loose LC filter
just for occasional AM reception.
Keep in mind that you can copy AM stations quite well in SSB mode by
zero-beating the carrier and choosing the better sideband (some SWBC
stations seem to t
Stewart Baker wrote:
Now I know that it is worth making even a fairly loose LC filter
just for occasional AM reception.
Keep in mind that you can copy AM stations quite well in SSB mode by
zero-beating the carrier and choosing the better sideband (some SWBC
stations seem to transmit only one
Just to pass the time I used a wire to link across an unused
filter position (with a series 0.1u DC blocking capacitor),
adjusted the filter bandwidth to 8kHz, and listened to AM
broadcast stations. Quite a respectable performance, much better
than with a 2.7kHz filter.
Now I know that it is worth
Jerry Flanders wrote:
for SWL. Only downside (a minor one, IMO) is that you might get response
from images 30 KHz away. How much weaker is a signal when you tune to
its image 30 KHz up/down?
Less than 30kHz. The whole point of the exercise is to use wide
filters, so, assuming that the interf
Stewart G3RXQ wrote:
>
> Why not an LC filter for AM reception instead of an expensive
> crystal roofing filter ?
>
I was going to suggest that, then I thought of the points Lyle made and
guessed that it wouldn't work. But if it works well enough for casual
listening and people are willing to a
On 5/5/08, Jerry Flanders <[EMAIL PROTECTED]> wrote:
> Sounds good for SWL. Only downside (a minor one, IMO) is that you might get
> response from images 30 KHz away. How much weaker is a signal when you tune
> to its image 30 KHz up/down?
>
> Jerry W4UK
>
I can't hear anything, Jerry, even from o
> Blast ! you got there before me Dave.
> I have been modeling some suitable LC filters, but as you say they
> are a bit wide for transmit. However looking back in my log shows
> that I haven't had an AM QSO for 10's of years, so it's unlikely I
> will have one now. :-)
>
> 73
> Stewart G3RXQ
Sounds good for SWL. Only downside (a minor one, IMO) is that you
might get response from images 30 KHz away. How much weaker is a
signal when you tune to its image 30 KHz up/down?
Jerry W4UK
At 11:01 AM 5/5/2008, Dave Martin wrote:
On 5/5/08, Stewart Baker <[EMAIL PROTECTED]> wrote:
> Why no
... I sure wouldn't transmit
with it, though. It's hugely wide, offering no attenuation of
unwanted mixer products.
If the filter is too wide, then poor 15 kHz image rejection, aliasing
and other unwanted things might happen in Rx. The DSP depends on
bandwidth limiting prior to digitizing,
Blast ! you got there before me Dave.
I have been modeling some suitable LC filters, but as you say they
are a bit wide for transmit. However looking back in my log shows
that I haven't had an AM QSO for 10's of years, so it's unlikely I
will have one now. :-)
73
Stewart G3RXQ
On Mon, 5 May 2008 1
On 5/5/08, Stewart Baker <[EMAIL PROTECTED]> wrote:
> Why not an LC filter for AM reception instead of an expensive
> crystal roofing filter ?
>
That's what I did. I cut a scrap of PC board to the size of a filter
and used three toroids with tuning and coupling caps. It worked just
fine in posit
Why not an LC filter for AM reception instead of an expensive
crystal roofing filter ?
73
Stewart G3RXQ
On Mon, 05 May 2008 08:29:29 -0600, KM5Q wrote:
> My widest filter is 2.8. I am allowed to widen the DSP to 4. So
why
> not in AM, for BC receiving, be allowed wide enough for high
fidelity,
> w
My widest filter is 2.8. I am allowed to widen the DSP to 4. So why
not in AM, for BC receiving, be allowed wide enough for high fidelity,
without a roofing (or xmit) filter? (AM can be widened to "10", but it
sounds narrow and muffled)
I get much better bandwidth (fidelity) now using SSB t
KM5Q wrote:
I like using the K3 for shortwave listening. I would rather not be
required to buy the FM xtal filter to get the full bandwidth on AM. Will
this change with future revisions?
I don't understand the question; it seems to me to be a matter of physics.
A roofing filter is needed to
Windy Dankoff KM5Q wrote:
>
> I like using the K3 for shortwave listening. I would rather not be
> required to buy the FM xtal filter to get the full bandwidth on AM.
> Will this change with future revisions?
>
How can you have an IF bandwidth wider than 6KHz without using a filter
that's w
lable for K3
firmware and I appreciate the fact that there is
online HELP behind each of the CONFIG options (Press
DISP when CONFIG menu is up) rather than that time and
code space being expended on keeping the display
ranges withing what the operator should already kind
of know. Just my look.
[Elec
--- Original Message -
From: "Don Rasmussen" <[EMAIL PROTECTED]>
To:
Sent: Sunday, May 04, 2008 8:32 PM
Subject: [Elecraft] K3 FM filter required for full AM receive width
Windy,
The stock K3 comes with one 2.7khz filter and that's a
hardware limitation.
The firmware c
he FM filter and it may also be usable in AM
transmit. I know its good for FM and SWL.
[Elecraft] K3 FM filter required for full AM receive
width
KM5Q km5q at mac.com
Sun May 4 20:19:42 EDT 2008
Previous message: [Elecraft] Re: K3 FW 1.87 SSB output
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Wayne,
In the new firmware announcement you say:
AM RECEIVE WIDTH RANGE INCREASED
...
NORM selects an IF bandwidth of 6.0 kHz in this mode. WIDTH settings
above 6.0 kHz will not be useful unless you have an FM-bandwidth
crystal filter installed (at FL1).
I like using the K3 for shortwave
Lyle Johnson wrote:
Can someone tell me what the bandwidth of the FM filter is?
13 kHz
73,
Lyle KK7P
Thanks Lyle
73 Ian
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SysOp GB7MBC DX Cluster
Member RSGB, GQRP
K2 #4044 |K3 #455
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Can someone tell me what the bandwidth of the FM filter is?
13 kHz
73,
Lyle KK7P
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Hi all,
Can someone tell me what the bandwidth of the FM filter is? I have
fitted it but I cannot see any information regarding bandwidth.
Thanks
Ian
--
Ian J Maude, G0VGS
SysOp GB7MBC DX Cluster
Member RSGB, GQRP
K2 #4044 |K3 #455
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What is the bandwidth of the KFL-FM filter...
It is 13 kHz and the menu entry is corrected in the FM mode code were
currently testing.
73,
Lyle KK7P
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What is the bandwidth of the KFL-FM filter, for entering in to the filter
setup? I had the idea it was a 15KHz filter, but all the references to it I
can find just call it an FM filter, and the adjustment in the Config menu
only goes up to 12.50.
-
Julian, G4ILO K3 s/n: 222 K2 s/n: 392
G4ILO
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