K2 SSB crystal filter set lacks calibration value

[Mark Petrovic]

Hi.

My K2 SSB option inventory correctly has the part number E850006 qty. 7
4.9MHz crystal filters, but the envelope containing the filters has no
calibration value recorded on the outside.  Is there an easy way to
determine what this value should be?

Thanks.

--
Mark
AE6RT

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[Don Wilhelm]

Mark,

Assume it is 3.6 for the initial filter alignment.
That can be refined later. if you use an audio spectrum analyzer and a
broadband noise generator to properly position the filter passband.

73,
Don W3FPR

On 4/6/2018 10:13 PM, Mark Petrovic wrote:
> Hi.
>
> My K2 SSB option inventory correctly has the part number E850006 qty. 7
> 4.9MHz crystal filters, but the envelope containing the filters has no
> calibration value recorded on the outside.  Is there an easy way to
> determine what this value should be?
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[Mark Petrovic]

Thanks, Don.  If I lack the spectrum analyzer and noise generator to
perform the refinement, what sorts of outcomes can I expect?  Will the SSB
option work, but sub-optimally?

On Fri, Apr 6, 2018 at 8:03 PM, Don Wilhelm <[hidden email]> wrote:

> Mark,
>
> Assume it is 3.6 for the initial filter alignment.
> That can be refined later. if you use an audio spectrum analyzer and a
> broadband noise generator to properly position the filter passband.
>
> 73,
> Don W3FPR
>
>
> On 4/6/2018 10:13 PM, Mark Petrovic wrote:
>
>> Hi.
>>
>> My K2 SSB option inventory correctly has the part number E850006 qty. 7
>> 4.9MHz crystal filters, but the envelope containing the filters has no
>> calibration value recorded on the outside.  Is there an easy way to
>> determine what this value should be?
>>
>

--
Mark
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[Don Wilhelm]

Mark,

The SSB reception will work, but the passband may not be positioned
optimally.
Same goes for the CW filters, they will work but may not be centered at
your desired sidetone pitch.

The audio Spectrum analyzer is easy to obtain.  Go to my website
www.w3fpr.com and scroll down on the opening page.  You will see links
to both version 5.17 and version 16 of Spectrogram (both freeware).
SpectrumLab also has a nice audio spectrum analyzer (free).

You may be able to get by with using broadband antenna noise from a
"dead band" instead of a broadband noise generator, although the noise
generator will be more convenient.  Just make certain there are no
signals on the band you use.

You can find Spectrogram plots of what you should be looking for at
http://www.mmccs.com/mmarc/n0ss/index_k2.html.  Scroll down to find the
K2 Xtal Filter Alignment article - do not use the Spectrogram link on
that website (it is no longer good), Download Spectrogram from my website.

73,
Don W3FPR

On 4/6/2018 11:32 PM, Mark Petrovic wrote:

> Thanks, Don.  If I lack the spectrum analyzer and noise generator to
> perform the refinement, what sorts of outcomes can I expect?  Will the
> SSB option work, but sub-optimally?
>
> On Fri, Apr 6, 2018 at 8:03 PM, Don Wilhelm <[hidden email]
> <mailto:[hidden email]>> wrote:
>
>     Mark,
>
>     Assume it is 3.6 for the initial filter alignment.
>     That can be refined later. if you use an audio spectrum analyzer
>     and a broadband noise generator to properly position the filter
>     passband.
>
>     73,
>     Don W3FPR
>
>
>     On 4/6/2018 10:13 PM, Mark Petrovic wrote:
>
>         Hi.
>
>         My K2 SSB option inventory correctly has the part number
>         E850006 qty. 7
>         4.9MHz crystal filters, but the envelope containing the
>         filters has no
>         calibration value recorded on the outside.  Is there an easy
>         way to
>         determine what this value should be?
>
>
>
>
> --
> Mark

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