Paul Christensen wrote:
> I'm a bit confused over the data as presented in Sherwood's chart:
> http://www.sherweng.com/presentation.html
> For example, he shows the Orion with only the 20 kHz roofing filter at
> 96dB/79dB (20 kHz and 2 kHz DR) but the Orion with the 500 Hz roofing filter
> is degraded to 96dB/75 dB.
> In another example the Orion with 1 kHz filtering (I am assuming non-roofing
> in the lower I.F.) has tested performance of 96dB/85dB @ 1 kHz but degrades
> to 86dB/72dB with a 500 Hz non-roofing filter @ 1kHz.
> Is it me or are the numbers counter-intuitive?
Orion's close-in IM performance is substantially
degraded with 500 & 250 Hz filters. Some claim
that's due to additional gain, but I doubt it.
73,
Sinisa YT1NT, VA3TTN
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