Barry N1EU wrote: > > > Bill W4ZV wrote: >> >> 1. It *WILL* keep your AGC from pumping if there's another strong station >> within the 1.8 kHz passband. However, do you really think you could copy >> a weak >> signal while a S9+30 interfering signal is inside your 1.8k bandwidth? I >> don't >> think so. With any typical SSB filter bandwidth, AGC pumping is not a >> practical >> issue (it IS a big deal for CW however). >> > > Bill, I'm confused by that first sentence. How can a signal within the > passband NOT pump the AGC? > > Normally when AGC pumping is discussed, it's a negative reference to an > adjacent signal that's outside of the passband. > > Barry N1EU >
You're correct Barry. I meant to say just outside your passband. However, given that most SSB signals generate 3rd garbage (spurs, phase noise, etc) in the area of -35 dBc, an S9+30 signal just outside your 1.8k passband will easily obliterate a weak signal inside the passband. I found my ears to be the best tool for copying weak signals in the presence of strong adjacent splatter. For whatever reason they heard better using the stock 5-pole 2.7k set to a DSP BW of 2.0-2.1k than the 8-pole 1.8k set to actuate at DSP = 1.9k. I tried many times to use the 1.8k but simply just found the 2.7k worked better for me. Of course that's just my experience which wouldn't necessarily apply to everyone. 73, Bill -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-Filter-question-SSB-tp6981339p6982912.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ 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
