I have an Omni 6 opt 1, which I like very much, but on weak cw signals, my experience with the filters seems counter-intuitive. I almost always have easier and clearer copy on weak cw signals when I
Hi Jeff - I believe you. All our ears are so very different. I have experienced what you have, there are times that my own ears and brain do a better job of distinguishing the signal from the noise t
Jeff, I have sometimes had the same experience. It seems to me that when you use a very narrow filter in noisy conditions, and assuming the filter is not ringing, making things worse, what you end up
This is very common amongst VHF/UHF weak signal DXers (including EMEers) too. It's also little know but wider bandwidths for SSB improve intelligibility too especially for the very weak signal case (
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sat, 16 Jun 2007 13:25:33 -0600
The time response of various filter designs is very important. The classical Tchebychev filter approximations typical of crystal lattice filters and vintage Collins mechanical filters have a rotten t
Good Evening: I always thought I was greatly blessed to start out as a rock bound Novice in late 1960 [g]. Especially since I had a super-wide BW receiver called a Hallicrafters S-38D. Seemed like I
Wow! Doc what a story!! In 1961 I had my novice, WN4JGI and I bought from WRL a Lafayette Receiver that was wide as a barn! My Xmtr was a Hallicrafters HT40. I was not hearing anyone call me so I won
Ah, good! I remember my second rig with a built-in VFO, the Ten Tec PM3A (picked up at a swap meet, the fellow thought it was a cute little "monitor" receiver without much value, but he did charge $4
Jerry, Taking your point regarding filter response shape (ideally, rounded edges, steep slopes, and flat passband), and looking at the response curves for the Inrad CW filters, they look pretty incre
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 19 Jun 2007 15:33:49 -0600
Yes, they do look nicely rounded, no sharp corners, no vertical slopes, no close in notches, all of which cuts way back on ringing. And it only took 30 years of fussing about ringing filters to make
Hi Jeff, I had a similar experience with my Argosy. Then I discovered that tweaking the alignment so that the desired signal falls into the center of the filter passband made a BIG difference. Now th