Re: Bandpass filter measurement anomalies

Rudolf Reuter
 

Hello Steve,

Thank you for the very interesting post.

Because I did not like a wide band amplifier because of the
lack of qualified measuring equipment, I designed a passive
output filter for the DDS generator. Please look at:
http://www.rudiswiki.de/wiki9/AmateurRadioDDSgenerator#Filter_AD9850_from_DL5FA

With a symmetric transformer I reach about -3 dBm output level.
If I increase the DDS DAC output current within a allowed range,
0 dBm output level is achievable.
http://www.rudiswiki.de/wiki9/AmateurRadioDDSgenerator#Output_level_0_dBm

73, Rudolf DL5FA

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