REF OSC Frequency

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REF OSC Frequency

Rajiv Dewan, N2RD
Great suggestion Greg.

I did not have an appropriate cable to hook into J1 on KEF3. So I
unhooked it from KSYN3 and used the cable to J2 and some clips I had.  I
have an HP5343A counter slaved to an HP3801Z GPA stabilized 10MHz
reference.  Using this setup, I measured the frequency of the KREF3
(with KTCXO option) at 30 second intervals from cold start.  Here is
what I got:

Time min:sec -  Frequency 49.xxx.xxx MHz, only the KHz part is noted below:
0:00  - 361.250
0:30 - 361.261
1:00 - 361.306
1:30 - 365:350   big jump!!
2:00 - 377.346 another big jump!!
2:30 - 377.380
3:00 - 377.419
3:30 - 377.471
4:00 - 377.464
4:30 - 377.457
5:00 - 377.507
5:30 - 377.504
6:00 - 377.500
6:30 - 377.490

Turned off and on right away

377.405

Is this normal?

Thanks for the suggestion to check this.  I am now going to turn it on,
wait for ten minutes, set the REF CAL and then do the VCO calibration.

PS: I am also forwarding it to the elecraft list as the frequency drift
seems interesting.

Raj, N2RD







Greg wrote:

> Raj.  You need to do the REF CAL procedure.  If you do not have an accurate
> frequency counter for method 1, use method two using USB/LSB to zero beat
> WWV.  Set the radio to 10.000 MHz or 15.000 MHz.  Alternate between USB and
> LSB while listening.  Adjust the ref oscillator frequency  so that there's
> no change in the tones.
>
> What's probably happening is the RO is off by enough that when you use the
> narrow filters you are loosing the signal as its outside the passband.
>
> Let me know how it goes.  I'll be up for awhile longer.
>
> Greg
>
>
> -----Original Message-----
> From: Rajiv Dewan, N2RD [mailto:[hidden email]]
> Sent: Monday, December 31, 2007 6:37 PM
> To: Greg
> Subject: Re: [Elecraft] K3 #170 CW Filter oddity
>
>
> It is the default 49.380Mhz.
>
> Raj
>
> Greg wrote:
>  
>> Raj.  What freq is your reference oscillator set to?
>>
>> Greg
>>
>>
>> -----Original Message-----
>> From: [hidden email]
>> [mailto:[hidden email]]On Behalf Of Rajiv Dewan, N2RD
>> Sent: Monday, December 31, 2007 4:49 PM
>> To: [hidden email]; Elecraft List
>> Subject: Re: [Elecraft] K3 #170 CW Filter oddity
>>
>>
>> Added note: the change in the DDS frequency occurs by just changing the
>> filter width or selecting the narrower filters.
>>
>> Raj
>>
>> Rajiv Dewan, N2RD wrote:
>>
>>    
>>> I have 250Hz, 400Hz and 2.8KHz roofing filters installed.  After
>>> update to the latest firm ware I am noticing that the radio goes
>>> really deaf when the 250Hz or the 400Hz filters are used.  I have set
>>> the appropriate gain of 4db and 2db, respectively for the 250Hz and
>>> 400Hz filters.  The FLX FRQ is 0.0 for all.  But the deafness is much
>>> more profound than a few dB.
>>>
>>> I noticed that the peak in my signal is not where CWT indicates
>>> perfect tune
>>> While I am tuned to a CW signal at 7.02706KHz, I turned on CONFIG:DDS
>>> FRQ and noticed that this frequency changes from 3.581367 MHz to
>>> 3.581579 MHz and the radio goes deaf.  No change in tuned frequency.
>>> I checked that the FL FREQ for these filters is 0.0.  What gives?
>>>
>>> Does any of you have the same behavior?
>>>
>>> Regards,
>>> Raj, N2RD
>>>
>>>
>>> _______________________________________________
>>> 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
>>>
>>>      
>> _______________________________________________
>> 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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RE: REF OSC Frequency

Greg - AB7R
Raj,

You have to read the manual when doing this....Please note this BOLD FACED
caution on page 47.

Before attempting reference calibration,
allow the transceiver to warm up at room
temperature for about 15 minutes (cover on).

Greg




-----Original Message-----
From: Rajiv Dewan, N2RD [mailto:[hidden email]]
Sent: Monday, December 31, 2007 7:38 PM
To: Greg; [hidden email]
Cc: Elecraft List
Subject: REF OSC Frequency


Great suggestion Greg.

I did not have an appropriate cable to hook into J1 on KEF3. So I
unhooked it from KSYN3 and used the cable to J2 and some clips I had.  I
have an HP5343A counter slaved to an HP3801Z GPA stabilized 10MHz
reference.  Using this setup, I measured the frequency of the KREF3
(with KTCXO option) at 30 second intervals from cold start.  Here is
what I got:

Time min:sec -  Frequency 49.xxx.xxx MHz, only the KHz part is noted below:
0:00  - 361.250
0:30 - 361.261
1:00 - 361.306
1:30 - 365:350   big jump!!
2:00 - 377.346 another big jump!!
2:30 - 377.380
3:00 - 377.419
3:30 - 377.471
4:00 - 377.464
4:30 - 377.457
5:00 - 377.507
5:30 - 377.504
6:00 - 377.500
6:30 - 377.490

Turned off and on right away

377.405

Is this normal?

Thanks for the suggestion to check this.  I am now going to turn it on,
wait for ten minutes, set the REF CAL and then do the VCO calibration.

PS: I am also forwarding it to the elecraft list as the frequency drift
seems interesting.

Raj, N2RD







Greg wrote:
> Raj.  You need to do the REF CAL procedure.  If you do not have an
accurate
> frequency counter for method 1, use method two using USB/LSB to zero beat
> WWV.  Set the radio to 10.000 MHz or 15.000 MHz.  Alternate between USB
and

> LSB while listening.  Adjust the ref oscillator frequency  so that there's
> no change in the tones.
>
> What's probably happening is the RO is off by enough that when you use the
> narrow filters you are loosing the signal as its outside the passband.
>
> Let me know how it goes.  I'll be up for awhile longer.
>
> Greg
>
>
> -----Original Message-----
> From: Rajiv Dewan, N2RD [mailto:[hidden email]]
> Sent: Monday, December 31, 2007 6:37 PM
> To: Greg
> Subject: Re: [Elecraft] K3 #170 CW Filter oddity
>
>
> It is the default 49.380Mhz.
>
> Raj
>
> Greg wrote:
>
>> Raj.  What freq is your reference oscillator set to?
>>
>> Greg
>>
>>
>> -----Original Message-----
>> From: [hidden email]
>> [mailto:[hidden email]]On Behalf Of Rajiv Dewan, N2RD
>> Sent: Monday, December 31, 2007 4:49 PM
>> To: [hidden email]; Elecraft List
>> Subject: Re: [Elecraft] K3 #170 CW Filter oddity
>>
>>
>> Added note: the change in the DDS frequency occurs by just changing the
>> filter width or selecting the narrower filters.
>>
>> Raj
>>
>> Rajiv Dewan, N2RD wrote:
>>
>>
>>> I have 250Hz, 400Hz and 2.8KHz roofing filters installed.  After
>>> update to the latest firm ware I am noticing that the radio goes
>>> really deaf when the 250Hz or the 400Hz filters are used.  I have set
>>> the appropriate gain of 4db and 2db, respectively for the 250Hz and
>>> 400Hz filters.  The FLX FRQ is 0.0 for all.  But the deafness is much
>>> more profound than a few dB.
>>>
>>> I noticed that the peak in my signal is not where CWT indicates
>>> perfect tune
>>> While I am tuned to a CW signal at 7.02706KHz, I turned on CONFIG:DDS
>>> FRQ and noticed that this frequency changes from 3.581367 MHz to
>>> 3.581579 MHz and the radio goes deaf.  No change in tuned frequency.
>>> I checked that the FL FREQ for these filters is 0.0.  What gives?
>>>
>>> Does any of you have the same behavior?
>>>
>>> Regards,
>>> Raj, N2RD
>>>
>>>
>>> _______________________________________________
>>> 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
>>>
>>>
>> _______________________________________________
>> 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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Happy New Year

Don Wilhelm-4
I know this is 3 hours early for those on the left coast,  but we
greeted 2008 a few minutes ago here in North Carolina.

Best wishes for a Happy and prosperous New Year to us all.

73,
Don W3FPR

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Re: Happy New Year

dave.wilburn
Don Wilhelm wrote:

> I know this is 3 hours early for those on the left coast,  but we
> greeted 2008 a few minutes ago here in North Carolina.
>
> Best wishes for a Happy and prosperous New Year to us all.
>
> 73,
> Don W3FPR
>
> _______________________________________________
> 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
>
73 es hpy nw yr
de k4dgw

Dave Wilburn
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Re: REF OSC Frequency

Rajiv Dewan, N2RD
In reply to this post by Greg - AB7R
Greg,
  You are right about the bold faced caution on Page 47 and indeed I
waited long before doing the REF CAL, which I did using Method 2 with
the cover closed.  However, I am still surprised by the frequency
excursion measured on start up.  I did wait a lot longer and calibrated
it using method 2, zero beating it with WWV.  This was at ref cal value
of 49,379,611, which is a lot closer to the frequency noted on the sheet
that came with the TCXO - 49,379,964.
  With the ref cal set, I have re done VCO CAL and other calibrations.  
For now all seems to be as it should be.  I have my fingers crossed.
  Thanks for your help,
Raj

Greg wrote:

> Raj,
>
> You have to read the manual when doing this....Please note this BOLD FACED
> caution on page 47.
>
> Before attempting reference calibration,
> allow the transceiver to warm up at room
> temperature for about 15 minutes (cover on).
>
> Greg
>
>
>
>
> -----Original Message-----
> From: Rajiv Dewan, N2RD [mailto:[hidden email]]
> Sent: Monday, December 31, 2007 7:38 PM
> To: Greg; [hidden email]
> Cc: Elecraft List
> Subject: REF OSC Frequency
>
>
> Great suggestion Greg.
>
> I did not have an appropriate cable to hook into J1 on KEF3. So I
> unhooked it from KSYN3 and used the cable to J2 and some clips I had.  I
> have an HP5343A counter slaved to an HP3801Z GPA stabilized 10MHz
> reference.  Using this setup, I measured the frequency of the KREF3
> (with KTCXO option) at 30 second intervals from cold start.  Here is
> what I got:
>
> Time min:sec -  Frequency 49.xxx.xxx MHz, only the KHz part is noted below:
> 0:00  - 361.250
> 0:30 - 361.261
> 1:00 - 361.306
> 1:30 - 365:350   big jump!!
> 2:00 - 377.346 another big jump!!
> 2:30 - 377.380
> 3:00 - 377.419
> 3:30 - 377.471
> 4:00 - 377.464
> 4:30 - 377.457
> 5:00 - 377.507
> 5:30 - 377.504
> 6:00 - 377.500
> 6:30 - 377.490
>
> Turned off and on right away
>
> 377.405
>
> Is this normal?
>
> Thanks for the suggestion to check this.  I am now going to turn it on,
> wait for ten minutes, set the REF CAL and then do the VCO calibration.
>
> PS: I am also forwarding it to the elecraft list as the frequency drift
> seems interesting.
>
> Raj, N2RD
>
>
>
>
>
>
>
> Greg wrote:
>  
>> Raj.  You need to do the REF CAL procedure.  If you do not have an
>>    
> accurate
>  
>> frequency counter for method 1, use method two using USB/LSB to zero beat
>> WWV.  Set the radio to 10.000 MHz or 15.000 MHz.  Alternate between USB
>>    
> and
>  
>> LSB while listening.  Adjust the ref oscillator frequency  so that there's
>> no change in the tones.
>>
>> What's probably happening is the RO is off by enough that when you use the
>> narrow filters you are loosing the signal as its outside the passband.
>>
>> Let me know how it goes.  I'll be up for awhile longer.
>>
>> Greg
>>
>>
>> -----Original Message-----
>> From: Rajiv Dewan, N2RD [mailto:[hidden email]]
>> Sent: Monday, December 31, 2007 6:37 PM
>> To: Greg
>> Subject: Re: [Elecraft] K3 #170 CW Filter oddity
>>
>>
>> It is the default 49.380Mhz.
>>
>> Raj
>>
>> Greg wrote:
>>
>>    
>>> Raj.  What freq is your reference oscillator set to?
>>>
>>> Greg
>>>
>>>
>>> -----Original Message-----
>>> From: [hidden email]
>>> [mailto:[hidden email]]On Behalf Of Rajiv Dewan, N2RD
>>> Sent: Monday, December 31, 2007 4:49 PM
>>> To: [hidden email]; Elecraft List
>>> Subject: Re: [Elecraft] K3 #170 CW Filter oddity
>>>
>>>
>>> Added note: the change in the DDS frequency occurs by just changing the
>>> filter width or selecting the narrower filters.
>>>
>>> Raj
>>>
>>> Rajiv Dewan, N2RD wrote:
>>>
>>>
>>>      
>>>> I have 250Hz, 400Hz and 2.8KHz roofing filters installed.  After
>>>> update to the latest firm ware I am noticing that the radio goes
>>>> really deaf when the 250Hz or the 400Hz filters are used.  I have set
>>>> the appropriate gain of 4db and 2db, respectively for the 250Hz and
>>>> 400Hz filters.  The FLX FRQ is 0.0 for all.  But the deafness is much
>>>> more profound than a few dB.
>>>>
>>>> I noticed that the peak in my signal is not where CWT indicates
>>>> perfect tune
>>>> While I am tuned to a CW signal at 7.02706KHz, I turned on CONFIG:DDS
>>>> FRQ and noticed that this frequency changes from 3.581367 MHz to
>>>> 3.581579 MHz and the radio goes deaf.  No change in tuned frequency.
>>>> I checked that the FL FREQ for these filters is 0.0.  What gives?
>>>>
>>>> Does any of you have the same behavior?
>>>>
>>>> Regards,
>>>> Raj, N2RD
>>>>
>>>>
>>>> _______________________________________________
>>>> 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
>>>>
>>>>
>>>>        
>>> _______________________________________________
>>> 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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Re: Happy New Year

Doug Person
In reply to this post by dave.wilburn
Happy New Year to all from the chilly west slope of the Rocky Mountains
in Colorado.

73, Doug -- K0DXV

Dave Wilburn wrote:

> Don Wilhelm wrote:
>> I know this is 3 hours early for those on the left coast,  but we
>> greeted 2008 a few minutes ago here in North Carolina.
>>
>> Best wishes for a Happy and prosperous New Year to us all.
>>
>> 73,
>> Don W3FPR
>>
>> _______________________________________________
>> 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
>>
> 73 es hpy nw yr
> de k4dgw
>
> Dave Wilburn
> _______________________________________________
> 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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Re: Happy New Year

Kevin Rock
In reply to this post by Don Wilhelm-4
Hi Don,
   I was busy writing firmware when you wrote this note :)  Snowy, windy, and chilly but this is the kind of weather to which I am accustomed for this day of celebration!  
   
   May 2008 be our best of years.

73 and Happy New Year! (well, in two hours :)
   KJR

-----Original Message-----

>From: Don Wilhelm <[hidden email]>
>Sent: Jan 1, 2008 12:10 AM
>To: Elecraft List <[hidden email]>
>Subject: [Elecraft] Happy New Year
>
>I know this is 3 hours early for those on the left coast,  but we
>greeted 2008 a few minutes ago here in North Carolina.
>
>Best wishes for a Happy and prosperous New Year to us all.
>
>73,
>Don W3FPR
_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
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RE: REF OSC Frequency

Greg - AB7R
In reply to this post by Rajiv Dewan, N2RD
Anytime.  Glad to help Raj.

73
Greg
AB7R


-----Original Message-----
From: Rajiv Dewan, N2RD [mailto:[hidden email]]
Sent: Monday, December 31, 2007 9:42 PM
To: Greg
Cc: [hidden email]; Elecraft List
Subject: Re: REF OSC Frequency


Greg,
  You are right about the bold faced caution on Page 47 and indeed I
waited long before doing the REF CAL, which I did using Method 2 with
the cover closed.  However, I am still surprised by the frequency
excursion measured on start up.  I did wait a lot longer and calibrated
it using method 2, zero beating it with WWV.  This was at ref cal value
of 49,379,611, which is a lot closer to the frequency noted on the sheet
that came with the TCXO - 49,379,964.
  With the ref cal set, I have re done VCO CAL and other calibrations.
For now all seems to be as it should be.  I have my fingers crossed.
  Thanks for your help,
Raj

Greg wrote:

> Raj,
>
> You have to read the manual when doing this....Please note this BOLD FACED
> caution on page 47.
>
> Before attempting reference calibration,
> allow the transceiver to warm up at room
> temperature for about 15 minutes (cover on).
>
> Greg
>
>
>
>
> -----Original Message-----
> From: Rajiv Dewan, N2RD [mailto:[hidden email]]
> Sent: Monday, December 31, 2007 7:38 PM
> To: Greg; [hidden email]
> Cc: Elecraft List
> Subject: REF OSC Frequency
>
>
> Great suggestion Greg.
>
> I did not have an appropriate cable to hook into J1 on KEF3. So I
> unhooked it from KSYN3 and used the cable to J2 and some clips I had.  I
> have an HP5343A counter slaved to an HP3801Z GPA stabilized 10MHz
> reference.  Using this setup, I measured the frequency of the KREF3
> (with KTCXO option) at 30 second intervals from cold start.  Here is
> what I got:
>
> Time min:sec -  Frequency 49.xxx.xxx MHz, only the KHz part is noted
below:

> 0:00  - 361.250
> 0:30 - 361.261
> 1:00 - 361.306
> 1:30 - 365:350   big jump!!
> 2:00 - 377.346 another big jump!!
> 2:30 - 377.380
> 3:00 - 377.419
> 3:30 - 377.471
> 4:00 - 377.464
> 4:30 - 377.457
> 5:00 - 377.507
> 5:30 - 377.504
> 6:00 - 377.500
> 6:30 - 377.490
>
> Turned off and on right away
>
> 377.405
>
> Is this normal?
>
> Thanks for the suggestion to check this.  I am now going to turn it on,
> wait for ten minutes, set the REF CAL and then do the VCO calibration.
>
> PS: I am also forwarding it to the elecraft list as the frequency drift
> seems interesting.
>
> Raj, N2RD
>
>
>
>
>
>
>
> Greg wrote:
>
>> Raj.  You need to do the REF CAL procedure.  If you do not have an
>>
> accurate
>
>> frequency counter for method 1, use method two using USB/LSB to zero beat
>> WWV.  Set the radio to 10.000 MHz or 15.000 MHz.  Alternate between USB
>>
> and
>
>> LSB while listening.  Adjust the ref oscillator frequency  so that
there's
>> no change in the tones.
>>
>> What's probably happening is the RO is off by enough that when you use
the

>> narrow filters you are loosing the signal as its outside the passband.
>>
>> Let me know how it goes.  I'll be up for awhile longer.
>>
>> Greg
>>
>>
>> -----Original Message-----
>> From: Rajiv Dewan, N2RD [mailto:[hidden email]]
>> Sent: Monday, December 31, 2007 6:37 PM
>> To: Greg
>> Subject: Re: [Elecraft] K3 #170 CW Filter oddity
>>
>>
>> It is the default 49.380Mhz.
>>
>> Raj
>>
>> Greg wrote:
>>
>>
>>> Raj.  What freq is your reference oscillator set to?
>>>
>>> Greg
>>>
>>>
>>> -----Original Message-----
>>> From: [hidden email]
>>> [mailto:[hidden email]]On Behalf Of Rajiv Dewan, N2RD
>>> Sent: Monday, December 31, 2007 4:49 PM
>>> To: [hidden email]; Elecraft List
>>> Subject: Re: [Elecraft] K3 #170 CW Filter oddity
>>>
>>>
>>> Added note: the change in the DDS frequency occurs by just changing the
>>> filter width or selecting the narrower filters.
>>>
>>> Raj
>>>
>>> Rajiv Dewan, N2RD wrote:
>>>
>>>
>>>
>>>> I have 250Hz, 400Hz and 2.8KHz roofing filters installed.  After
>>>> update to the latest firm ware I am noticing that the radio goes
>>>> really deaf when the 250Hz or the 400Hz filters are used.  I have set
>>>> the appropriate gain of 4db and 2db, respectively for the 250Hz and
>>>> 400Hz filters.  The FLX FRQ is 0.0 for all.  But the deafness is much
>>>> more profound than a few dB.
>>>>
>>>> I noticed that the peak in my signal is not where CWT indicates
>>>> perfect tune
>>>> While I am tuned to a CW signal at 7.02706KHz, I turned on CONFIG:DDS
>>>> FRQ and noticed that this frequency changes from 3.581367 MHz to
>>>> 3.581579 MHz and the radio goes deaf.  No change in tuned frequency.
>>>> I checked that the FL FREQ for these filters is 0.0.  What gives?
>>>>
>>>> Does any of you have the same behavior?
>>>>
>>>> Regards,
>>>> Raj, N2RD
>>>>
>>>>
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>>>>
>>>>
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>>
>
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