1. Elecraft-K3@groups.io
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Re: CW narrow filter

Michael Kopec
 

Hello Rich VE3KI.  To get the filter specs now, according to elecraft webmaster, you must email tech support and they will send them to u de Mike K8NS

On Monday, November 26, 2018, 5:54:46 PM EST, ve3ki <ve3iay@...> wrote:


Thank you, Joe. I wanted to be able to point to the Elecraft plots, but I was unsuccessful when trying to find them on the new web site - thanks for the link.

73,
Rich VE3KI


On Mon, Nov 26, 2018 at 02:49 PM, Joe Subich, W4TV wrote:
If you find you really need one, I'd suggest the 200 Hz filter,
because the 250 Hz filter is actually not all that much narrower
than the 400 Hz filter (333 Hz vs. 464 Hz at -6 dB, according to
> <http://audiosystemsgroup.com/K3FilterStudy-250HzRoof.pdf>).


I would choose to believe the measurements made by Elecraft at:
<https://elecraft.com/pages/k3s-8-215-mhz-first-if-crystal-filter-response-curves>


The Elecraft curves show the -6 dB response points at roughly 480 Hz
for the "400 Hz" filter (KFL3C-400) and 370 Hz for the "250 Hz" filter
(KFL3A-250) both of which are actually made for/imported by INRAD.

The Elecraft application note also includes a comparison of the
KLF3A-250 vs. KFL3C-200 which shows the 200 Hz filter is tighter
than the 250 Hz filter to at least -50 dB (where the bandwidth
of both is approximately 700 Hz).

73,

... Joe, W4TV


On 2018-11-26 11:53 AM, ve3ki wrote:
To start with, try just using the Width and Shift controls. You can narrow the DSP bandpass down to 50 Hz, independently of what roofing filters you may or may not have installed. See <http://www.nccc.cc/archived_meetings/pdf/K3%20Filters,%20Jan%202009.pdf>.

If you find that strong signals inside the 400 Hz filter bandpass but outside the narrower DSP bandpass are often causing AGC pumping or IMD problems that you can't eliminate with the Shift, Width and AGC controls, a narrower roofing filter might help. If you find you really need one, I'd suggest the 200 Hz filter, because the 250 Hz filter is actually not all that much narrower than the 400 Hz filter (333 Hz vs. 464 Hz at -6 dB, according to <http://audiosystemsgroup.com/K3FilterStudy-250HzRoof.pdf>). I believe that a lot of the difference seen by users who have both is primarily due to the narrower DSP width setting.

73,
Rich VE3KI

On Mon, Nov 26, 2018 at 10:46 AM, john ni0k wrote:


Operating the CW WW CQ contest makes me wish for something narrower than
the 400 Hz filter in my rig currently. I know Elecraft has a 200 Hz
filter but is there something else that people are using?

73,
-John NI0K
Re: CW narrow filter

ve3ki
 

Thank you, Joe. I wanted to be able to point to the Elecraft plots, but I was unsuccessful when trying to find them on the new web site - thanks for the link.

73,
Rich VE3KI


On Mon, Nov 26, 2018 at 02:49 PM, Joe Subich, W4TV wrote:
If you find you really need one, I'd suggest the 200 Hz filter,
because the 250 Hz filter is actually not all that much narrower
than the 400 Hz filter (333 Hz vs. 464 Hz at -6 dB, according to
> <http://audiosystemsgroup.com/K3FilterStudy-250HzRoof.pdf>).


I would choose to believe the measurements made by Elecraft at:
<https://elecraft.com/pages/k3s-8-215-mhz-first-if-crystal-filter-response-curves>


The Elecraft curves show the -6 dB response points at roughly 480 Hz
for the "400 Hz" filter (KFL3C-400) and 370 Hz for the "250 Hz" filter
(KFL3A-250) both of which are actually made for/imported by INRAD.

The Elecraft application note also includes a comparison of the
KLF3A-250 vs. KFL3C-200 which shows the 200 Hz filter is tighter
than the 250 Hz filter to at least -50 dB (where the bandwidth
of both is approximately 700 Hz).

73,

... Joe, W4TV


On 2018-11-26 11:53 AM, ve3ki wrote:
To start with, try just using the Width and Shift controls. You can narrow the DSP bandpass down to 50 Hz, independently of what roofing filters you may or may not have installed. See <http://www.nccc.cc/archived_meetings/pdf/K3%20Filters,%20Jan%202009.pdf>.

If you find that strong signals inside the 400 Hz filter bandpass but outside the narrower DSP bandpass are often causing AGC pumping or IMD problems that you can't eliminate with the Shift, Width and AGC controls, a narrower roofing filter might help. If you find you really need one, I'd suggest the 200 Hz filter, because the 250 Hz filter is actually not all that much narrower than the 400 Hz filter (333 Hz vs. 464 Hz at -6 dB, according to <http://audiosystemsgroup.com/K3FilterStudy-250HzRoof.pdf>). I believe that a lot of the difference seen by users who have both is primarily due to the narrower DSP width setting.

73,
Rich VE3KI

On Mon, Nov 26, 2018 at 10:46 AM, john ni0k wrote:


Operating the CW WW CQ contest makes me wish for something narrower than
the 400 Hz filter in my rig currently. I know Elecraft has a 200 Hz
filter but is there something else that people are using?

73,
-John NI0K
Re: CW narrow filter

Joe Subich, W4TV
 

If you find you really need one, I'd suggest the 200 Hz filter, because the 250 Hz filter is actually not all that much narrower
than the 400 Hz filter (333 Hz vs. 464 Hz at -6 dB, according to <http://audiosystemsgroup.com/K3FilterStudy-250HzRoof.pdf>;).

I would choose to believe the measurements made by Elecraft at:
<https://elecraft.com/pages/k3s-8-215-mhz-first-if-crystal-filter-response-curves>;


The Elecraft curves show the -6 dB response points at roughly 480 Hz
for the "400 Hz" filter (KFL3C-400) and 370 Hz for the "250 Hz" filter
(KFL3A-250) both of which are actually made for/imported by INRAD.

The Elecraft application note also includes a comparison of the
KLF3A-250 vs. KFL3C-200 which shows the 200 Hz filter is tighter
than the 250 Hz filter to at least -50 dB (where the bandwidth
of both is approximately 700 Hz).

73,

... Joe, W4TV


On 2018-11-26 11:53 AM, ve3ki wrote:
To start with, try just using the Width and Shift controls. You can narrow the DSP bandpass down to 50 Hz, independently of what roofing filters you may or may not have installed. See <http://www.nccc.cc/archived_meetings/pdf/K3%20Filters,%20Jan%202009.pdf>.
If you find that strong signals inside the 400 Hz filter bandpass but outside the narrower DSP bandpass are often causing AGC pumping or IMD problems that you can't eliminate with the Shift, Width and AGC controls, a narrower roofing filter might help. If you find you really need one, I'd suggest the 200 Hz filter, because the 250 Hz filter is actually not all that much narrower than the 400 Hz filter (333 Hz vs. 464 Hz at -6 dB, according to <http://audiosystemsgroup.com/K3FilterStudy-250HzRoof.pdf>;). I believe that a lot of the difference seen by users who have both is primarily due to the narrower DSP width setting.
73,
Rich VE3KI
On Mon, Nov 26, 2018 at 10:46 AM, john ni0k wrote:


Operating the CW WW CQ contest makes me wish for something narrower than
the 400 Hz filter in my rig currently. I know Elecraft has a 200 Hz
filter but is there something else that people are using?

73,
-John NI0K
Re: CW narrow filter

Bill Maddock
 

John,

I have the 6 pole 200 hz filter in my K3 , which i used for search and pounce in the contest. I upgraded from the 5 pole 200 hz filter. Didnt really notice much difference. I have the old 200 hz filter for sale if your interested. The 200 hz filter really helped during the contest.
73 de Bill W4RTN


On Mon, Nov 26, 2018 at 9:46 AM, john ni0k
<jasimmons@...> wrote:
Operating the CW WW CQ contest makes me wish for something narrower than
the 400 Hz filter in my rig currently. I know Elecraft has a 200 Hz
filter but is there something else that people are using?

73,
-John NI0K
Re: Slight Frequency Shift When Keying

Bob McGraw - K4TAX
 

I always shut everything down in sequence.  On power up the next time, be a few hours or several days, no issues experienced. 

I find the system is quite robust and highly repeatable. 

Bob, K4TAX



On Nov 26, 2018, at 10:08 AM, Richard Williams via Groups.Io <k8ztt@...> wrote:

Don,

Am surprised you turn off your radio every night.  Other than when on vacation or TRWs are in the area, I leave my computers (I let the monitors go to sleep), K3S, and just about all the associated equipment on 24/7 (except for the amp).

The only time I have had an issue with a computer or the K3, was after I had turned them off, and then back on.

Dick, K8ZTT 


On Mon, Nov 26, 2018 at 6:17 AM, wb6bee
<wb6bee@...> wrote:
That' interesting.   I am using the Powerwerx SS 30 DV power supply for the K3s.   I AM leaving it on all night (and have forever).   

I will rig up some measuring for it and see what happens.

Don
WB6BEE

Re: CW narrow filter

ve3ki
 

To start with, try just using the Width and Shift controls. You can narrow the DSP bandpass down to 50 Hz, independently of what roofing filters you may or may not have installed. See <http://www.nccc.cc/archived_meetings/pdf/K3%20Filters,%20Jan%202009.pdf>.

If you find that strong signals inside the 400 Hz filter bandpass but outside the narrower DSP bandpass are often causing AGC pumping or IMD problems that you can't eliminate with the Shift, Width and AGC controls, a narrower roofing filter might help. If you find you really need one, I'd suggest the 200 Hz filter, because the 250 Hz filter is actually not all that much narrower than the 400 Hz filter (333 Hz vs. 464 Hz at -6 dB, according to <http://audiosystemsgroup.com/K3FilterStudy-250HzRoof.pdf>). I believe that a lot of the difference seen by users who have both is primarily due to the narrower DSP width setting.

73,
Rich VE3KI


On Mon, Nov 26, 2018 at 10:46 AM, john ni0k wrote:
Operating the CW WW CQ contest makes me wish for something narrower than
the 400 Hz filter in my rig currently. I know Elecraft has a 200 Hz
filter but is there something else that people are using?

73,
-John NI0K
Re: Slight Frequency Shift When Keying

Richard Williams
 

Don,

Am surprised you turn off your radio every night.  Other than when on vacation or TRWs are in the area, I leave my computers (I let the monitors go to sleep), K3S, and just about all the associated equipment on 24/7 (except for the amp).

The only time I have had an issue with a computer or the K3, was after I had turned them off, and then back on.

Dick, K8ZTT 


On Mon, Nov 26, 2018 at 6:17 AM, wb6bee
<wb6bee@...> wrote:
That' interesting.   I am using the Powerwerx SS 30 DV power supply for the K3s.   I AM leaving it on all night (and have forever).   

I will rig up some measuring for it and see what happens.

Don
WB6BEE

Re: Slight Frequency Shift When Keying

Richard Williams
 




On Mon, Nov 26, 2018 at 6:17 AM, wb6bee
<wb6bee@...> wrote:
That' interesting.   I am using the Powerwerx SS 30 DV power supply for the K3s.   I AM leaving it on all night (and have forever).   

I will rig up some measuring for it and see what happens.

Don
WB6BEE

CW narrow filter

john ni0k
 

Operating the CW WW CQ contest makes me wish for something narrower than the 400 Hz filter in my rig currently. I know Elecraft has a 200 Hz filter but is there something else that people are using?

73,
-John NI0K
Re: Slight Frequency Shift When Keying

Bob McGraw - K4TAX
 

Measure the voltage at the 12V accessory connector on the rear of the radio.   

Another point to consider, I've found it necessary to always connect a dedicated ground conductor between the ground terminal on the back of the radio to the ground terminal on the power supply.   In fact each piece of my station equipment is bonded to the station power supply ground terminal by a dedicated ground conductor.  For these I use #10 AWG auto primary wire with a suitable ring connector which is both crimped and soldered.   This assures every piece of equipment is always at the same potential.    This has nothing to do with "lightning protection" as that protection system occurs outside of the house and should NEVER inside the house. 

73

Bob, K4TAX



On 11/26/2018 9:23 AM, john ni0k wrote:
Don,

Hmmmm. Interesting. Two thoughts: check the voltage inside the radio; send an email to support@...

-J

wb6bee wrote on 11/26/2018 9:16 AM:
According to the Fluke, 14.1 volts from the Power supply on RX and 14.06 Volts on TX.

Don
WB6BEE


Ability to send KAT500 and KPA500 commands through the K-Pod

Irwin Darack
 

This weekend in the CQWW CW contest, I found my self switching between Ant 1 & 2 on my KAT500 depending on which antenna I wanted to use for 80 & 160 meters (vertical or inverted L).  That got me looking for a way to create a macro in either N1MM or the K-Pod. I could keep the KAT500 utility open; this would create another software running in addition to everything you have open in a contest. After doing some research, I realized that the macro's in both only send commands to my K3s radio, which to my knowledge do not transfer over the KAT500.

Since both my KAT500 and KPA500 are already connected to my K3s, possibly a future firmware addition to the K-Pod firmware would allow you to create macro's which send commands to them.

Another option maybe in N1MM to create a Macro that sends a command to the specific com port that the KAT500 is connected to.
Thanks,
Irwin KD3TB
Re: Slight Frequency Shift When Keying

john ni0k
 

Don,

Hmmmm. Interesting. Two thoughts: check the voltage inside the radio; send an email to support@...

-J

wb6bee wrote on 11/26/2018 9:16 AM:

According to the Fluke, 14.1 volts from the Power supply on RX and 14.06 Volts on TX.

Don
WB6BEE

Re: Slight Frequency Shift When Keying

wb6bee
 

According to the Fluke, 14.1 volts from the Power supply on RX and 14.06 Volts on TX.

Don
WB6BEE
Re: Slight Frequency Shift When Keying

wb6bee
 

That' interesting.   I am using the Powerwerx SS 30 DV power supply for the K3s.   I AM leaving it on all night (and have forever).   

I will rig up some measuring for it and see what happens.

Don
WB6BEE
Re: Slight Frequency Shift When Keying

john ni0k
 

Please check and monitor the voltage output of the power supply, especially when transmitting. There may be some heat-activated issue with the power supply. Also, the Powerpole connectors used on the K3 can become loose and also cause a voltage drop.

73,
-John NI0K

John/K4WJ wrote:

Don,

Roy, K6XK, told me the same thing about my keying. It appears to happen when I leave the RS 30m turned on overnight and doesn't happen when I turn the PS off before going to bed.

I turn the K3 off every night before I QRT for the day. However during the time of the year when thunderstorm activity is low, I was leaving the supply run all night long. When I started doing this is when Roy started telling me about the slight frequency shift. As the thunderstorm activity began to rise I started turning off the PS before retiring for bed, the frequency shift problem went away.

I'm wondering if something is heating up in the K3 when the power supply is left turned on all night long.

I have not discussed this problem with Elecraft.

73..de John/K4WJ

On 11/23/2018 8:28 AM, wb6bee wrote:
I have a K3s.   I only use CW.   I only use a Bug.   Speed about 26-28 wpm.    I have the K3s set on "non-QSK", but the interval is short.   

I got the following Report

"When it happens it is always after you send a string of characters and pause for a few seconds. When you start xmitting again your freq will shift ever so slightly, like maybe 5 Hz or so. It will hold that freq until another long pause the back to the original freq. Back and forth  just every once in awhile then sometimes not at all. "

The change when I pause may be due to the non-QSK timing out.

Anyone have any similar experiences and/or comments

Don
WB6BEE

Re: Slight Frequency Shift When Keying

John/K4WJ
 

Don,

Roy, K6XK, told me the same thing about my keying. It appears to happen when I leave the RS 30m turned on overnight and doesn't happen when I turn the PS off before going to bed.

I turn the K3 off every night before I QRT for the day. However during the time of the year when thunderstorm activity is low, I was leaving the supply run all night long. When I started doing this is when Roy started telling me about the slight frequency shift. As the thunderstorm activity began to rise I started turning off the PS before retiring for bed, the frequency shift problem went away.

I'm wondering if something is heating up in the K3 when the power supply is left turned on all night long.

I have not discussed this problem with Elecraft.

73..de John/K4WJ

On 11/23/2018 8:28 AM, wb6bee wrote:
I have a K3s.   I only use CW.   I only use a Bug.   Speed about 26-28 wpm.    I have the K3s set on "non-QSK", but the interval is short.   

I got the following Report

"When it happens it is always after you send a string of characters and pause for a few seconds. When you start xmitting again your freq will shift ever so slightly, like maybe 5 Hz or so. It will hold that freq until another long pause the back to the original freq. Back and forth  just every once in awhile then sometimes not at all. "

The change when I pause may be due to the non-QSK timing out.

Anyone have any similar experiences and/or comments

Don
WB6BEE

Re: N1MM Command for KAT500

Steve VE3RX
 

Make sure that in the KAT500 Utility you have enabled all antennas on all the bands. If you restrict which antenna you can use on a specific band, the KAT500 will not allow switching to a different antenna, not manually anyway...
That is the only hunch I have - check which antennas are enabled via the utility for each band.
N1MM Command for KAT500

Irwin Darack
 

I am looking for a Macro in N1MM that that lets me change the KAT500 Antenna settings to the next Antenna switch.
I see from the KAT500 Reference Manual that AN0 moves to the next antenna, while AN1 changes the KAT500 to  antenna 1, etc.
This was my experiment that did not work  {CATA1ASC AN0}. Any suggestions?
--
Thanks
Irwin KD3TB
Re: dumb question

Doug, VE3MV
 

GA  Todd:

The are both 3.5 mm

as per the manual (page 20 on the Ver D8 that I’m using)
* Line IN is MONO transformer isolated and 
* Line OUT is  STEREO transformer isolated.  Normally the Left channel is the main RX audio and the Right channel is the sub receiver audio (if applicable).

73,  Doug  VE3MV

On 2018-Nov-24, at 3:34 PM, todd ruby <todd@...> wrote:

What type of plug do the Line In and Line Out jacks accept? 3.5mm RCA mono?

tnx

todd

WB2ZAB

dumb question

todd ruby
 

What type of plug do the Line In and Line Out jacks accept? 3.5mm RCA mono?

tnx

todd

WB2ZAB
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