Hi!
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Elecraft has often published doc related to SSB filter alignment using Sectrogram:
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Excellent page here not only provides the uncrippled Spectrogram for download but a noise generator and many other goodies as well.
73
Rahul VU3WJM
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"Wijaya, J." wrote:
With the software and connecting the output of the AF amp to? PC, i wonder where do we set the BFO to find out the shape of our filter, assuming that we do not know the center frequency yet, or setting the BFO is not necessary?
rgds
julius
* REPLY SEPARATOR? *
On 7/20/2005 at 9:14 AM vdberghak wrote:
>Indeed measuring is knowing if the final result is in line with the
>original expectations.
>As mentioned before, it can be easily done with the sound card. At that
>time, I asked for feedback (screenshots of the same method) of measured
>filters to see if my 4,9 MHz filter is about in line with the 10 MHz
>version. If some members do this measurement it is possible to compare
>results and find out if it is really a 'lottery'. As I understand, most
>builders have their
filter dimensioned in accordance with the original
>schematic and they all seems to work fine?
>OK builders, please download the few kb program, connect your BITX to
>the sound card, measure the shape of the filter and post the screendump!
>Thanks in advance,
>Chris.
>
>> Without measuring to get
>> good filter is more lottery than predictable result. Only in
>> situation that somebody can use the same type of crystals producer
>> and batch results might be comparable.
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>Yahoo! Groups Links
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