Elecraft

K3 Filter question

Classic

List

Threaded

6 messages Options

Keith Heimbold

K3 Filter question

I have recently been examining how my K3 filters operate and was curious if I could somehow expand the range I can use my lowest filter which is 250 kHz. It generally cuts out at 300 kHz and then my 1.8 kHz filter takes over. I would like to use the 250 kHz filter up to 400 kHz as I have read the filter is actually specified for 370 kHz. How do i change the cut out point for this filter? Is this something I can change in the utility program under filter calibration? I appreciate any advice on this.

Thanks,

Keith
AK6ZZ

Sent from my iPhone please excuse typos
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

Matt Zilmer-3

Re: K3 Filter question

Hi Keith,

In the K3 utility program, you can change the filter bandwidths to
whatever you need. Many ops use this function to set filter switch
points that are different than the listed bandwidth. Look under the
Configure tab, then push the Configure Crystal Filters radio button.

Note that setting a non-standard filter bandwidth only changes the
point at which changing the Width (or Hi/Lo) control causes a switch
to the next filter in your "stack". Actual filter performance stays
as it is. Just a normal disclaimer... :)

73,
matt W6NIA

On Wed, 26 Feb 2014 06:28:59 -0800, you wrote:

>I have recently been examining how my K3 filters operate and was curious if I could somehow expand the range I can use my lowest filter which is 250 kHz. It generally cuts out at 300 kHz and then my 1.8 kHz filter takes over. I would like to use the 250 kHz filter up to 400 kHz as I have read the filter is actually specified for 370 kHz. How do i change the cut out point for this filter? Is this something I can change in the utility program under filter calibration? I appreciate any advice on this.
>
>Thanks,
>
>Keith
>AK6ZZ
>
>Sent from my iPhone please excuse typos
>______________________________________________________________
>Elecraft mailing list
>Home: http://mailman.qth.net/mailman/listinfo/elecraft
>Help: http://mailman.qth.net/mmfaq.htm
>Post: mailto:[hidden email]
>
>This list hosted by: http://www.qsl.net
>Please help support this email list: http://www.qsl.net/donate.html

Matt Zilmer, W6NIA
--
"Give me six hours to chop down a tree and I will
spend the first four sharpening the axe." -A. Lincoln
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

Joe Subich, W4TV-4

Re: K3 Filter question

In reply to this post by Keith Heimbold

> How do i change the cut out point for this filter? Is this something
> I can change in the utility program under filter calibration?

Yes, set the bandwidth of that slot to 380 or 400 Hz. See the Owner's
Manual or K3 Utility help file.

73,

... Joe, W4TV

On 2/26/2014 9:28 AM, Keith Heimbold wrote:
> I have recently been examining how my K3 filters operate and was
curious if I could somehow expand the range I can use my lowest filter
which is 250 kHz. It generally cuts out at 300 kHz and then my 1.8 kHz
filter takes over. I would like to use the 250 kHz filter up to 400 kHz
as I have read the filter is actually specified for 370 kHz. How do i
change the cut out point for this filter? Is this something I can change
in the utility program under filter calibration? I appreciate any advice
on this.

>
> Thanks,
>
> Keith
> AK6ZZ
>
> Sent from my iPhone please excuse typos
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

Keith Heimbold

Re: K3 Filter question

In reply to this post by Matt Zilmer-3

Matt,

Thanks, I was hoping that was the case. The 1.8 kHz filter is good for SSB but not exactly what I want at 350 kHz in CW. I think I will set it for 600 kHz and see what happens.

I really appreciate your quick response.

Keith
AK6ZZ

Sent from my iPhone please excuse typos

> On Feb 26, 2014, at 6:38 AM, "Matt Zilmer" <[hidden email]> wrote:
>
> Hi Keith,
>
> In the K3 utility program, you can change the filter bandwidths to
> whatever you need. Many ops use this function to set filter switch
> points that are different than the listed bandwidth. Look under the
> Configure tab, then push the Configure Crystal Filters radio button.
>
> Note that setting a non-standard filter bandwidth only changes the
> point at which changing the Width (or Hi/Lo) control causes a switch
> to the next filter in your "stack". Actual filter performance stays
> as it is. Just a normal disclaimer... :)
>
> 73,
> matt W6NIA
>
>> On Wed, 26 Feb 2014 06:28:59 -0800, you wrote:
>>
>> I have recently been examining how my K3 filters operate and was curious if I could somehow expand the range I can use my lowest filter which is 250 kHz. It generally cuts out at 300 kHz and then my 1.8 kHz filter takes over. I would like to use the 250 kHz filter up to 400 kHz as I have read the filter is actually specified for 370 kHz. How do i change the cut out point for this filter? Is this something I can change in the utility program under filter calibration? I appreciate any advice on this.
>>
>> Thanks,
>>
>> Keith
>> AK6ZZ
>>
>> Sent from my iPhone please excuse typos
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
> Matt Zilmer, W6NIA
> --
> "Give me six hours to chop down a tree and I will
> spend the first four sharpening the axe." -A. Lincoln

Keith Heimbold

Re: K3 Filter question

In reply to this post by Joe Subich, W4TV-4

Thanks Joe for additional clarification will set to 400 kHz.

73,

Keith
AK6ZZ

Sent from my iPhone please excuse typos

> On Feb 26, 2014, at 6:45 AM, "Joe Subich, W4TV" <[hidden email]> wrote:
>
>
>> How do i change the cut out point for this filter? Is this something
>> I can change in the utility program under filter calibration?
>
> Yes, set the bandwidth of that slot to 380 or 400 Hz. See the Owner's
> Manual or K3 Utility help file.
>
> 73,
>
> ... Joe, W4TV
>
>
>> On 2/26/2014 9:28 AM, Keith Heimbold wrote:
>> I have recently been examining how my K3 filters operate and was
> curious if I could somehow expand the range I can use my lowest filter
> which is 250 kHz. It generally cuts out at 300 kHz and then my 1.8 kHz
> filter takes over. I would like to use the 250 kHz filter up to 400 kHz
> as I have read the filter is actually specified for 370 kHz. How do i
> change the cut out point for this filter? Is this something I can change
> in the utility program under filter calibration? I appreciate any advice
> on this.
>>
>> Thanks,
>>
>> Keith
>> AK6ZZ
>>
>> Sent from my iPhone please excuse typos
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

Matt Zilmer-3

Re: K3 Filter question

In reply to this post by Keith Heimbold

Hi Keith,

I understand, and I'm running the 250 Hz filters in main and sub
receivers at 350 Hz, myself. If you make this type of adjustment, you
might want to check the amount of gain for the filter with the changed
switch point. It shouldn't be off by much, but worth checking anyway.

73,
matt W6NIA

On Wed, 26 Feb 2014 06:45:53 -0800, you wrote:

>Matt,
>
>Thanks, I was hoping that was the case. The 1.8 kHz filter is good for SSB but not exactly what I want at 350 kHz in CW. I think I will set it for 600 kHz and see what happens.
>
>I really appreciate your quick response.
>
>Keith
>AK6ZZ
>
>Sent from my iPhone please excuse typos
>
>> On Feb 26, 2014, at 6:38 AM, "Matt Zilmer" <[hidden email]> wrote:
>>
>> Hi Keith,
>>
>> In the K3 utility program, you can change the filter bandwidths to
>> whatever you need. Many ops use this function to set filter switch
>> points that are different than the listed bandwidth. Look under the
>> Configure tab, then push the Configure Crystal Filters radio button.
>>
>> Note that setting a non-standard filter bandwidth only changes the
>> point at which changing the Width (or Hi/Lo) control causes a switch
>> to the next filter in your "stack". Actual filter performance stays
>> as it is. Just a normal disclaimer... :)
>>
>> 73,
>> matt W6NIA
>>
>>> On Wed, 26 Feb 2014 06:28:59 -0800, you wrote:
>>>
>>> I have recently been examining how my K3 filters operate and was curious if I could somehow expand the range I can use my lowest filter which is 250 kHz. It generally cuts out at 300 kHz and then my 1.8 kHz filter takes over. I would like to use the 250 kHz filter up to 400 kHz as I have read the filter is actually specified for 370 kHz. How do i change the cut out point for this filter? Is this something I can change in the utility program under filter calibration? I appreciate any advice on this.
>>>
>>> Thanks,
>>>
>>> Keith
>>> AK6ZZ
>>>
>>> Sent from my iPhone please excuse typos
>>> ______________________________________________________________
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:[hidden email]
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>> Matt Zilmer, W6NIA
>> --
>> "Give me six hours to chop down a tree and I will
>> spend the first four sharpening the axe." -A. Lincoln