The filter is 650 ohms and not 50 ohms. It is a roofing filter in this
application
so I will not expect SSB filter results!
Change your span to 2MHz and look. Ultimate rejection is 910KHz.
Raj
At 08-09-18, you wrote:
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My filters arrived earlier than
expected. These are from eBay at
Immediate results are disappointing so I have put them on the S/A to see
what is going on.
Center frequency: 44.987166 MHz, about 13 kHz lower than expected
Insertion loss: 6-10 dB across the bandpass at 50 ohms in/out
Corner points: 15 kHz across center
This filter is going to play havoc with SSB because of the variance
across the filter passband and because 45 MHz is centered on the extreme
high side of the filter.
When I put it in in place of R27 the results were not good. But it is
early and I have lots to verify yet. Tomorrow I will pull the 45 MHz
filter supplied with the uBitx and check it in the same way. I have no
point of reference but I am not excited about these filters at this point
in the testing.
WA8TOD
Raj vu2zap