"Grant Youngman" <[EMAIL PROTECTED]> made an utterance to the drakelist gang ---------------------------------------------------------------------- > found any of them to be of much use, if any. Most of these are/were > designed for pulse type noises, which, depending on your location and > application may or may not be needed.
That's what a "Noise Blanker" is for -- pulse type noise, electric fences, ignition noise, power-line noise, your neigbors old "touch controlled" lamp, and the like. They won't rid your audio of hiss, miscellaneous band grunge, thunderstorm static, etc. because these tend to be "glops" of noise rather that "pulses" of noise. The blanker in the TR-7 (NB7A) is very good, and the blanker in the R-4C is phenomenal. > Practically speaking.....Are they worth it? And,...outside of mobile > operating, what noises are they effective? In my opinion, yes. If you've ever suffered throug the power company repeated telling you that the s-9 buzzsaw running on your receiver isn't their fault, you'd understand why :) Again, pulse noises -- ignition, power transformer arching (not in your radio, at the power pole), unfiltered electrical devices controlled by triacs, etc. But they won't necessary get rid of everything -- it depends on the blanker characteristics, pulse width of the noise, filter width and characteristics ahead of the blanker, etc. > Someone also may wish to > discuss other noise reduction alternatives such as the ANEM which > el34guy mentioned. DSP noise reduction devices tackle a different problem (there are DSP-based noise blankers, but that's a different beast. It doesn't help much to "blank" a noise pulse in the receiver's audio chain -- it needs to be done BEFORE the noise pulse gets to the AGC). These basically reduce "hisssss" and clean up or reduce some other forms of non-pulse noise. They can take a noisy 75M band at night and (at least on strong signals) give you much "quiter" copy. The end objective should always be to improve Signal to Noise ratio. Sometimes they do that, and sometimes they don't. Nothing is perfect :) Grant/NQ5T ---------------------------------------------------------------------- Submissions: [EMAIL PROTECTED] Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net ----------------------------------------------------------------------
