They are light sensitive if they are made out of glass. Not so much with the ceramics. The mixture of gasses set the breakdown voltage. The ones I use fire at about 90 volts.
I remember working at sites where the gas tubes were filled with radioactive gases. From: Adam Moffett Sent: Wednesday, May 9, 2018 10:23 AM To: [email protected] Subject: Re: [AFMUG] mccowntech rack mount surge suppressor with Medusa I thought it took hundreds of volts to trigger a gas tube. Aren't some of them light sensitive? What if the APC chassis was near a window and getting direct sunlight? ------ Original Message ------ From: [email protected] To: [email protected] Sent: 5/9/2018 12:00:20 PM Subject: Re: [AFMUG] mccowntech rack mount surge suppressor with Medusa Funny, the product is so simple. Jacks. Tubes. Electrodes with gas between them from the Ethernet lines to ground. The only way the tubes can affect the circuit is if they are ionized, which means a high voltage coming from somewhere. could be coming from a ground loop or ??? Or a tube could be bad, or there could be a solder bridge but the test and inspection procedure should have caught that. From: Sam Lambie Sent: Wednesday, May 9, 2018 9:56 AM To: [email protected] Subject: Re: [AFMUG] mccowntech rack mount surge suppressor with Medusa FYI, I installed the gas tube version on a gigabit Packetflux Powered Medusa the other week and no go. The radio boots up for about 25 seconds, and then shuts down. On Wed, May 9, 2018 at 9:54 AM, <[email protected]> wrote: I am going to chase this down. Only certain types of products have the issue it seems. I am going to try to add solid state to the gas tubes using a different design that eliminates the steering diodes. Seems like the steering diodes are causing the problem in some situations. From: George Skorup Sent: Wednesday, May 9, 2018 9:50 AM To: [email protected] Subject: Re: [AFMUG] mccowntech rack mount surge suppressor with Medusa No diodes, just gas-tube for large surge event suppression. Obviously not as much protection though. I'm seeing more CRC errors than I'm comfortable with on the cards with diodes. Rev G is definitely better though. I've broken the shield at various sites while testing to rule out any potential ground loop issues. Ran on battery. Etc. It's weird. Noise or something, I don't know. On 5/9/2018 10:32 AM, Steve Jones wrote: What's this gas tube product placement? I want to see these On Wed, May 9, 2018, 9:51 AM <[email protected]> wrote: Thanks, yeah nothing fit well next to the thin pcbs. Odd, got some test results back from George yesterday. Some types of equipment has CRC errors with some of our surge suppressors. Trying to identify the bad combinations. Good thing is that our gas tube only products seem to be flawless with everything that people have tried them on. -----Original Message----- From: Matt Sent: Wednesday, May 9, 2018 8:08 AM To: [email protected] Subject: Re: [AFMUG] mccowntech rack mount surge suppressor with Medusa Chuck, Like form factor of new arrestors much better. Thicker PCB and RJ45 not as tall. They do not fit well next to your last thin pcb version though. Did not care for the thin pcb and tall RJ45 at all. Swapped out 4 PxP450i APC arrestors to these 17 hours ago. So far flawless even at 1000base. No errors at all. This is with RackInjector, Cambium Sync and very long cat-5 runs. Time will tell but looks good so far. On Wed, Apr 4, 2018 at 10:29 AM, <[email protected]> wrote: > Matt, > > I sent you a note off-list. I would like to send you the gas tube version > to see if that fixes the issue. > > Inquiring minds want to know... > > -----Original Message----- From: Matt > Sent: Wednesday, March 28, 2018 4:08 PM > To: [email protected] > Subject: Re: [AFMUG] mccowntech rack mount surge suppressor with Medusa > >> OK, so grounds are related to the problem. >> >> There may be something unusual with timing pulses on the power that is >> causing the surge suppressor to fire. >> Forrest would know much more than I about that. >> >> I honestly don’t know if anyone has tried my product with a Medusa >> before. >> I have a 100% gas tube version that may solve the problem. > > > I am still having some troubles with PTP450i holding 1gbit ethernet > even with Cambium sync. Not near as bad with Cambium Sync though. > Will these gas tube versions work any better? Will they still keep > equipment safe? -- -- Sam Lambie Taosnet Wireless Tech. 575-758-7598 Office www.Taosnet.com
