Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang ---------------------------------------------------------------------- Dan -
I'm not sure I understand your question. The Noise Blanker works by turning the receiver IF _OFF_ for the duration of a noise pulse. It works very well on very narrow spikes such as generated by auto spark plugs. As the noise pulses get wider, or closer together, they begin to "punch" bigger and bigger "holes" in the audio. If you think of a single tone signal such as a carrier, if there is a noise source present and you turn on the NB, your nice clean tone will become very raspy as it is interrupted by the NB to "blank" each pulse of noise.
There is a graphical representation of this process on the cover of the R-4B manual. The top circle shows the signal with noise pulses present, and depressing the IF gain because of the AVC. The lower circle shows the same signal, with the NB on, and shows the "holes" that are punched in the signal. The advantage is that the noise pulses are no longer depressing the AVC, allowing the desired signal to be much "bigger", albeit with a few holes punched in it. Obviously if the noise pulses are wide and or closer together the holes get big enough to blank most of the signal as well.
The NB does not have any real effect on noise such as static crashes from thunderstorms, etc. as the noise is such a wide "pulse".
Sorry if this is something you already know, but we gotta start somewhere! :-)
73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B & C-Line Service Supplement CDs <www.k4oah.com> [EMAIL PROTECTED] wrote:
[EMAIL PROTECTED] made an utterance to the drakelist gang ---------------------------------------------------------------------- Ahem.....now that I have your attention, is there someone out there in Drakeland that can help me with my R4B? When switched to NB, the audio becomes a bit rough. The audio is fine in all other settings of the function switch. I'm certain I have seem something about this on the list in the past, but maybe not. any pointers would be appreciated! ThAnks es 73 de Dan -- WA0JRD ..
---------------------------------------------------------------------- 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 ----------------------------------------------------------------------
