Group, Looks like this subject has ended, so I'll summarize:
Bruce Griffiths said the plastic has 12X the expansion coefficient of copper, so cold alone shouldn't have pulled the center pin. Now I wonder if the cold contraction pushed the insulation along the core wire and then pulled the pin when it warmed up. He also mentioned that some ROHS connections fail due to thermal cycling, but I used antique solder and wrench-clamp connectors. Tom Van Baak asked if the signal degraded or was cut off. I don't look at it all the time, so my first clue was the Holdover light on the receiver. GPScon gave me the holdover duration, accurate to 999 hours, then 1000+. Stan, W1LE, suggested a captive center pin connector, which I will try in April or May when the snow goes away. Thanks. Several people said 20 feet unsupported was too long, but I'm not gonna fill a 10 foot, 6 inch diameter pipe with foam. I'll get some light chain and individually tie the cables to the chain, then support the chain above the point where the cables turn into the 2 foot arms. Metric conversions are left as an exercise for the reader, as they are for me. Speaking of conversions, I grew up (since 1938) with movie credits that mentioned the Gaffer (head electrician). Last year I mentored students building a robot for a FIRST Robotics competition. The carpet on the field would be marked with red, black, and white gaffer's tape, which we got in 2 inch width from a theater supply place. Gaffer's tape is intended to hold down wires running across a set until the show closes. Where did Gaffa tape come from? Thanks to all who contributed. Bill Hawkins -----Original Message----- From: Stan W1LE Sent: Sunday, March 01, 2009 7:56 PM a couple of suggestions: 1. Use a captive center pin on the N male connector. for example, Kings Electronics Inc. N male, model # KN-59-176 for RG-214 coaxial cable, center pin is solder type and captive, will not move axially. Wrench clamp on the shield. Kings cage = 91836 mil spec: M39012/01-0005 a few bucks each 2. consider adding a foam in place insulation, inside the plastic pipe to support the coaxial cable. drill a 1/8" hole every few feet and squirt in the aerosol foam till it comes out of the hole. Go for the minimally expanding insulating foam you will find in Home Depot or Lowes. Stan, W1LE Fn41sr Cape Cod _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
