On Thursday 09 October 2014 12:33:17 John Dammeyer did opine And Gene did reply: > The Spectrum analyzer and SWR Bridge allow signal generation and as a > tracking generator can also analyze cables. It's a sweet tool. > > http://www.rohde-schwarz.com/en/product/fsh3-6-18-options_63490-7578.ht > ml > > http://www.rohde-schwarz.com/en/product/fshz2-productstartpage_63493-77 > 81.ht ml > > John
Dunno, I suppose if one wanted to test the quality of a new and unknown quality cable it could be useful. But in troubleshooting existing cables, I have yet to see anything work slicker than a good TDR. You can have a bullet burnout someplace in a 2100 foot run of high powered coax, take a look at it on the TDR and tell the tower crew within 5 feet of where to take it apart. The 5' error? Probably the operator, not knowing the exact propagation velocity of that particular line & using a SWAG instead. >From there of course, they may have to take several sections below it to clean up the burnt teflon soot, but it saves them time & you money for the high steel people on site if they don't have to take the last 140 feet of it apart looking for the problem. I've even used a homemade one, using F family chips for pulse drivers and a 100+ Mhz scope & some math. It worked well enough to hit the bad joint. And some local frogs who had never seen a TDR were telling me I was wasting my time. I told the crew to take the tower top jumper on the west side apart and if it was clean, start down, the line was slower than my data said it was. The jumper was 4 elbows arranged to form a U shape with the U laying horizontal. The vertical lines go up the face of the tower, and this jumper went from the vertical line to the line going up the antenna mast itself, a run of about 32" if the tower is Stainless G5. The line springs had gradually pulled the line up, slightly over stretched, and the U had about a gallon of water in it because the line had been pulled up about 4", creating a low spot for moisture to collect. Its a pressurized line, 2 to 3 psi of dry nitrogen in it, operator checked & replenished if needed 2x daily, so the ONLY way that water got in was the last crew put it together wet. And they knew it because they had to wait for the rain to stop before work resumed the next day, after leaving it open when they quit the night before, not even a garbage bag tied over it. The tower crew that originally did that work for me has never been on site again, per my orders. We were probably out some north of $50,000 in lost air time, make goods and extra work because they were so sloppy. > > -----Original Message----- > > From: Lester Caine [mailto:les...@lsces.co.uk] > > Sent: October-09-14 3:28 AM > > To: emc-users@lists.sourceforge.net > > Subject: Re: [Emc-users] Oscilloscope + logic analyzer (PC based) > > > > On 08/10/14 23:05, John Dammeyer wrote: > > > Sorry. 3GHz. Not MHz. > > > > Something that popped up on my in box ... > > https://www.coolcomponents.co.uk/rf-explorer-signal-generator- > > rfe6gen.html > > ... 24MHz to 6GHz controlled by the PC :) > > > > -- > > Lester Caine - G8HFL Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS ------------------------------------------------------------------------------ Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
