Roofing filters - I think the term has more to do with marketing than engineering. Other companies have made a big deal over having them and people have come to think of them as something special.
They are little more than filters placed early in the RX signal path to limit bandwidth ASAP. They were added to correct issues / problems that have crept into modern synth-based mulit-mode radios and they really do make the receivers work better. I have no idea where the term Roofing comes and I certainly don't try to make sense of it. It is just a term applied to a filter that is very worth having in a rig. What is sweet about the K2 is that the filters in the K2 are positioned early in the signal path so they in effect operate similar to the roofing filters that other manufactures put in their rigs. Check out the K2's RX performance and you'll see it is great. Early filtering is partly why. - Keith N1AS - - K2 5411.ssb.100 - -----Original Message----- I think, still, someone needs to define what a ROOFING FILTER is. Say for sake of argument - I have a passive or active or crystal filter - and it is to be used as a ROOFING FILTER. Why is it called this? Why is the filter itself, called a ROOFING FILTER? And where does the adjective, ROOFING, come into play? ...... I'm sure I'm dumb on this one - but would like to learn. Not until the K3 came on the Elecraft scene - did anyone mention or get concerned about the need for ROOFING FILTERS. Now they're all the rage? Fred, N3CSY _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
