On Tue, 11 Oct 2011 23:27:24 -0400, Charles Ring wrote: >I suspect the noise blanker in my R-4C is not working. How can I >definitively test it?
I have tested noise blankers in the past by wiring up a relay to a variable power supply through one of it's own normally closed contacts to make it "chatter", then adjusting the power supply for a slow chatter in the range of typical automotive ignition noise. A clip lead "antenna" on one of the relay connections is sometimes necessary. Impluse noise such as this should almost disappear with a good noise blanker. Atmospheric or constant noise, not so much. I've never tested an R-4C blanker this way, but in principle it should work. 73 -Jim -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! "Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime." HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org _______________________________________________ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
