Steve, There is nothing special about the low-pass filter that might require you to use a particular brand name. A ferrite isolator is a nonlinear device, and therefore it will generate a strong second harmonic which must be attenuated by either a notch filter or a low-pass filter. Notch filters are much cheaper than low-pass filters, but only attenuate the second harmonic. By definition, a low-pass filter effectively blocks all harmonics. Both types of harmonic filters are offered by Sinclair, Decibel Products, Telewave, EMR, TX-RX, and others.
73, Eric Lemmon WB6FLY > Steve Rodgers wrote: > > >Where would one expect to find the low pass filters to use with this > >isolator? > >If they are hard to find or are expensive, does anyone have a LPF design the > >can share which is capable of 50W on 70cm which can be constucted in a die > >cast aluminum box? > > > >I have an ridiculously expensive and bulky K&L 3TNF500/1000 tunable > >bandreject > >filter [which is overkill] I'm using temporarily. > > > >Steve > >WA6ZFT Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/