Hi Didier: The Tek 1502 is great for doing this, especially if you have the optional strip chart recorder. It's what it was made to do. http://www.pacificsites.com/~brooke/Tek1502.shtml
Have Fun, Brooke Clarke w/Java http://www.PRC68.com w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml http://www.precisionclock.com . . . . > >I have 3 coax runs going from my ham shack to the top of my tower to >feed the HF (14 to 30 MHz) and two VHF antennas (6m and 2m, or 50 MHz >and 144 MHz). One cable (HF) is regular RG-213, another (6m) is RG-214 >(essentially like RG-213 with double shield), the last one (2m) is >Ultra-flex air dielectric (more like 9913). All 3 runs are close in >length, about 135 feet. I have fed them with the 1 PPS signal and looked >at reflections with the storage scope (that's how I know the length). It >is interesting to see the big reflection when the signal gets to the >antennas. Of course, the antennas are a poor match for the 1 PPS signal >(fortunately), so they are essentially a short circuit. > >I need to take pictures, now that it is relatively cold here (everything >being relative) and take the same pictures in the summer and look for >differences between the 3 coax lines. Out of the 135 feet, 60 feet are >in the air going up the tower, 50 feet are in the ground (in a 4" PVC >pipe), the rest is in the garage and the attic, so temperature is not >well controlled or constant, but it should all vary in the same direction. > >Didier > > > _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts