Jan Erik Holm wrote:
>
> Yes something isn´t right. This was his measurements:
>
> CLOSE-IN INTERMODULATION ON 7MHz band,500Hz bandwidth, CW preamp off
>
> 2.7 kHz roofing 1.8 kHz roofing 500 Hz roofing
> 2kHz +19dBm 101dB +12.5dBm 96dB +2.5dBm 88dB
> 3kHz +19dBm 101dB +12.5dBm 96dB +2.5dBm 88dB
> 5kHz +22dBm 103dB +12.5dBm 96dB +8.5dBm 92dB
> 7kHz +22dBm 103dB +12.5dBm 96dB +13dBm 95dB
> 10kHz +22dBm 103dB +12.5dBm 96dB +17.5dBm 98dB
> 15kHz +22dBm 103dB +12.5dBm 96dB +22dBm 101dB
> 20kHz +22dBm 103dB +12.5dBm 96dB +25dBm 103dB
> 30kHz +22dBm 103dB +12.5dBm 96dB +26.5dBm 104dB
> 40kHz +22dBm 103dB +12.5dBm 96dB +27dBm 104dB
> 50kHz +22dBm 103dB +12.5dBm 96dB +27dBm 104dB
>
Yes, and also the 8-pole 1.8k should be better than the 5-pole 2.7k. Some
very strange results indeed but I'm sure Peter is reporting what he's
measuring. I cannot find his original Orion review but I recall it showed
the 2.4k 4-pole and 1.8k 8-pole to be much better than the 1.0k 4-pole at 2
kHz spacings, which again did not make sense unless the 1k filter was
defective.
73, Bill
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