Measurements with the Drake TV-3300-LP Low Pass Filter
I made various measurements using my miniVNApro and the DL2SBA vna/J software.
- Filter efficency
- Filter SWR on ham bands
- Filter impedence on ham bands
Filter efficency
This filter is design to block the frequencies over 30 Mhz to avoid TV interferences.
Drake mention minimum of 80 dB attenuation over 41 Mhz. The filter's input and output are connected to the 'DUT' and 'DET' miniVNApro SMA ports.
The software used for this measurement is vna/J using 'transmission mode'
Filter SWR
The graph shows the SWR values across the HF ham band spectrum.
One side of the filter is connected to the 'DUT' port of the miniVNApro, the other side to a 50 Ohm load.
The vna/J software is running in 'reflection' mode.
Filter impedance (Z)
The graph shows the impedance values (Z) across the HF ham band spectrum.
One side of the filter is connected to the 'DUT' port of the miniVNApro, the other side to a 50 Ohm load.
The vna/J software is running in 'reflection' mode.
