You are correct that the offset is zero for 8-pole filters.
What I do is adjust the filter gains so that there will be no change in signal strength when switching filters. You can do this by ear if you turn off the AGC, or you can use the K3's DBV function if you are a perfectionist.
I found -- and you may get very different results -- that the following gain values were about right for my filter complement:
2.8 kHz 0 dB 1.0 kHz 1 dB 400 Hz 5 dB 200 Hz 6 dB 73, Vic, 4X6GP/K2VCO Rehovot, Israel http://www.qsl.net/k2vco/ On 16 Jul 2015 11:19, G4GNX wrote:
I purchased a 400Hz 8 pole (Inrad) filter and installed it in my K3 yesterday. There were no markings on the box and some obscure numbers on a small label on the side of the filter case, but there was no offset figure. The Cady book mentions that for 8 pole filters an offset is unnecessary, so I presume this is correct? It also mentions adding a small gain figure of 1 or 2, what do others normally do for a CW filter? 73, Alan. G4GNX ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
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