Re: Topband: Verifying integrity of 75 ohm coax.

2013-11-25 Thread Raoul Coetzee
>The only documented cases of silicone grease causing an issue in switches is >from silicone-carbide is when contacts arc through the grease. It actually >is a very common lube for many applications. >73 Tom There was a time in my career in electronics servicing when I came in contact wi

Topband: The 18th Stew Perry TopBand Challenge

2013-11-25 Thread Lew Sayre
Greetings to all TopBand Operators, The Boring Amateur Radio Club is happy to announce the 18th running of the Stew Perry TopBand Challenge. It will be held publicly starting 1500Z 28 December to 1500Z December 29, 2013. This contest will utilize 160M only and requires the contestants to

Re: Topband: Connector grease

2013-11-25 Thread Tom W8JI
I've never had medical grade petroleum jelly attack any connectors that's not saying it won't, it's just that I've never had an issue with it. I've never heard of it attacking connectors. But I would never flood a high power connector with anything, even silicon dielectric grease. I think

Re: Topband: CONNECTOR GREASE

2013-11-25 Thread wb6tza
I have a mostly similar background and experience,  2way radio and silicone grease,  except,  they learned.  At 400 mhz and higher,  flooding an N connector with silicone greade (dow #4) introduces a significant and reasonably easily measured impedance bump.  For the last couple of decades   the

Topband: CONNECTOR GREASE

2013-11-25 Thread Bill and Liz
When I first got into the 2-way radio business back in the 70s I obtained a lot of literature from both Motorola and General Electric, for whom I did sub-contract work. On the subject of installing base station antennas, both companies recommended that the connectors be flooded with "vaseline"

Re: Topband: Connector grease

2013-11-25 Thread Eddy Swynar
On 2013-11-24, at 8:59 PM, wrote: >> I would not use petroleum jelly on any electrical connector, >> especially to >> flood it. That is bad advice, no matter what source recommends it. Hi Guys, I applied "Vaseline" petroleum jelly onto the coax connectors of my inverted "L" antennas at t