Re: [time-nuts] UPDATE: DATUM 9390-52054 Grief again...
Burt, what is your DAC setting now it's stabilised? It is normally set so it is mid-range when setting these units up. Rob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Burt I. Weiner Sent: 12 April 2013 19:49 To: time-nuts@febo.com Subject: [time-nuts] UPDATE: DATUM 9390-52054 Grief again... Sorry for the delay in posting this update. Things have been hectic, and then there was NAB. Here's what I've discovered: The receiver started working after about 6 hours of just sitting. However, the 9390's internal Vectron oscillator was quite a ways off frequency and did not want to lock after trying to stabilize all night. I had to tweak the adjustment screw quite a ways and then, after a while, it locked. Prior to this episode the oscillator had been sitting at only a few E-12. I suspect that this oscillator has had an intermittent problem for a long time, and I should not have had to tweak it as far as it wanted to go. The receiver portion has not failed in the few weeks since it decided to start seeing satellites again. Maybe because I had tweaked the oscillator? So, I got brave and changed the oscillator out with a smaller Vectron oscillator that I got from my friend Stu, K6YAZ. This is not a commercial, but he sells these oscillator modules on eBay. See: http://www.ebay.com/itm/10-MHz-precision-crystal-oscillator-in-sealed-oven-5 -volts-voltage-adjustable-/190820631639?pt=LH_DefaultDomain_0hash=item2c6dc bc457#ht_848wt_1143 The new oscillator requires 5 Volts rather than 12 Volts, which I simply grabbed from the from the power supply's 5 Volt rail. It was not a lot of fun removing the original oscillator from the circuit board and the associated fine traces, but once I plucked it from the board I put short wire leads in the original circuit board holes for the various connections to the new oscillator. I cut a piece of foam about the size of the old Vectron and carved out it's innards to accept the new, much smaller oscillator. This should provide some thermal stability and also insulate the new oscillator from the circuit board. I connected everything up, substituting the 5 Volt rail lead for the 12 Volt lead. When I powered the 9390 up everything seemed to work and the oscillator was within 1-Hertz, except that the output was about 20 dB higher than with the original oscillator was when it was working properly. Once the receiver locked up to 4 satellites and started OSC Stabilizing, the oscillator suddenly jumped about 18 Hz low and shortly afterwards the DAC went to all zeros. I let it sit all night figuring that it would eventually find itself. Well, it didn't, it just sat at 18 Hz low and the DAC at all zeros, and the EFC (Electronic Frequency Control) voltage at 0.19 Volts. (What a revolting development!) Very early this AM I got up and put a simple 10:1 voltage divider using a series 680 Ohm and 68 Ohm resistor from the oscillator's RF out to ground This brought the levels pretty much back to the same as my good 9390. I also substituted a pot for the EFC voltage. I used a 1 K pot in series with a 300 Ohm resistor to the 5 Volt rail. The resistor was on the high side, the bottom end to ground, and the wiper to the EFC terminal. I was able to tune the oscillator to precisely 10 MHz long enough to measure the substitute EFC at +2.15 Volts. Leaving it hooked up this way I let the receiver do it's thing just to see what would happen. It went through it's normal routine and finally the green lock light came on. Although the oscillator wasn't being controlled by the 9390, the 9390 thought it was happy and the DAC went to about 28,000 - very close to ideal. I tweaked the pot hither and yon to move the frequency and to see which way the EFC voltage went. It went the right direction to properly steer the oscillator and should have worked. Pondering the situation, I powered the 9390 down and reconnected the 9390's EFC voltage back up to see what would happen this time. This time it locked up quickly and the oscillator homed in on 10 MHz. The EFC voltage is 2.15 Volts and the DAC settled in nicely at 28302 - very close to the recommended DAC numbers. It's been cooking for about an hour now and is presently at 112E-12 and moving closer all the time. When comparing the two GPS receivers I am not seeing the random drifts that I had seen in the past. I suspect that the problem with the frequency jumping to -18 Hz and the DAC going to all zeros was the result of the new oscillator over-driving the following circuitry. In hindsight, maybe I should have probed a bit with the scope to see if that is a correct assumption, but I didn't do that. By the way, Stu sells the oscillators fully tested and with a note giving the EFC voltage for each unit to tune it to 10 MHz. If this turns out to be as good a modification as it now appears, I'm going to get more of the oscillators from him. I may replace the one in my other
Re: [time-nuts] Questions about Austron 5000 Loran C receiver
hi dears i'm newer here. i have some questions about loran-c receiver.can you help me? i want to know how can i find third zero crossing in loran-c receiver? i find third zero cross by peterson 's method from this paper: Analysis of Noise and Cycle Selection in a Loran Receiver but due to Gausian noise,when i find third zero cross,it is not correct and it is before or after correct third zero cross.i want to know how can i track and correct third zero cross?(in other words what is acquisition in loran-c receivers and how can i do?) have you any matlab code or papers or thesis for this problems? please help me? :( thanks a lot ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Questions about Austron 5000 Loran C receiver
Hi, I don't know this model from Austron, but you could try asking fellow Time Nuts if anyone has a manual for the 5000 which should include the full calibration procedure. I know on the Austron 2000C the calibration procedure was quite a long to set it up correctly. I'm sure that the 5000 will be similar. Rob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of mehdi Sent: 13 April 2013 13:08 To: time-nuts@febo.com Subject: Re: [time-nuts] Questions about Austron 5000 Loran C receiver hi dears i'm newer here. i have some questions about loran-c receiver.can you help me? i want to know how can i find third zero crossing in loran-c receiver? i find third zero cross by peterson 's method from this paper: Analysis of Noise and Cycle Selection in a Loran Receiver but due to Gausian noise,when i find third zero cross,it is not correct and it is before or after correct third zero cross.i want to know how can i track and correct third zero cross?(in other words what is acquisition in loran-c receivers and how can i do?) have you any matlab code or papers or thesis for this problems? please help me? :( thanks a lot ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Questions about Austron 5000 Loran C receiver
Hi The concept you most commonly see is a curve fit approach. You know the structure of the waveform through several cycles. You can fit this model waveform to the observed data over a large number of points. As you fit more points, the impact of the noise is reduced. Bob On Apr 13, 2013, at 8:07 AM, mehdi electrostud...@gmail.com wrote: hi dears i'm newer here. i have some questions about loran-c receiver.can you help me? i want to know how can i find third zero crossing in loran-c receiver? i find third zero cross by peterson 's method from this paper: Analysis of Noise and Cycle Selection in a Loran Receiver but due to Gausian noise,when i find third zero cross,it is not correct and it is before or after correct third zero cross.i want to know how can i track and correct third zero cross?(in other words what is acquisition in loran-c receivers and how can i do?) have you any matlab code or papers or thesis for this problems? please help me? :( thanks a lot ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Connectors
Scotchkote! Yes - Thank you for the correction! The other could lead to disaster! Nope - not ex-navy. Its pretty standard practice in the offshore world. My time was spent on research vessels down in Antarctica. Apologies for the mix-up. Brent On Fri, Apr 12, 2013 at 3:37 PM, paul swed paulsw...@gmail.com wrote: OK this is crazy I answered out of sequence not realizing my email had never been sent. Describing Navy and ScotchKote... Regards Paul WB8TSL On Fri, Apr 12, 2013 at 3:36 PM, paul swed paulsw...@gmail.com wrote: Brent You must be ex-Navy. We did the same thing with a final coat of liquid rubber. 3M scotch coat. On the ships I could open a connector that had been to sea for years and the connectors were clean as they were when installed. I still use this approach. Very solid and as I mentioned earlier in the thread I use the F connectors for lots of things. On Fri, Apr 12, 2013 at 12:01 PM, brent evers brent.ev...@gmail.com wrote: BTW - 3M Scotch rubber tape is regularly used in the offshore industry to make waterproof connections to 6000m/10,000psi. I use it on any/all outdoor signal (RF/Microwve antenna connectors, amphenol, etc) connectors as well. I cover the rubber tape with a layer of electrical tape (Super 88), and then a layer of scotchguard over that. Scotch rubber tape comes in both a linered (23), and liner-less (130C) version. I far prefer the liner-less 130c. To make sure this is time related, my two Thunderbolt antenna connectors are also sealed this way. Brent On Fri, Apr 12, 2013 at 11:16 AM, Rob Kimberley robkimber...@btinternet.com wrote: It's a very useful material, also called Self Amalgamating Tape. Been using it for years for all sorts of outside cable work. Rob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Azelio Boriani Sent: 12 April 2013 14:00 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Connectors Sorry, not neoprene but self-sealing polyisobutyl tape, very effective for the outdoor antenna work**. I have recently opened a sealed connection, after 10 years, and the protected connector appears as new. On Fri, Apr 12, 2013 at 2:38 PM, Azelio Boriani azelio.bori...@screen.itwrote: I use neoprene tape to make really water tight connections for all type of connectors. On Fri, Apr 12, 2013 at 1:27 PM, Bob Camp li...@rtty.us wrote: Hi The fancy F connectors are indeed waterproof if: 1) You have the right cable 2) The cable and connector match up 3) The tool and the connector match up The auction sites are a great place to get samples of connectors and tools that apparently work with no known cable . If you are not careful about the trim on the dielectric / positioning , they can have issues above 1 or 2 GHz. Even a lot of care they don't really do the job above 5 GHz. Exactly where they drop out depends (of course) on your return loss expectations. Bob On Apr 11, 2013, at 4:21 PM, Gordon Batey gpba...@wildblue.net wrote: Greetings, I have used the longitudinal compression F connectors for some time now with several GPS units and RG-6 cable. They certainly appear to be waterproof and quite sturdy. Not inexpensive but very serviceable. I found a kit with the installation tool and connectors and separate connectors at LOWES that does a nice job. I also found one for BNC that use the same principle but have not used it yet. Gordon WA4FJC ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list --
Re: [time-nuts] Questions about Austron 5000 Loran C receiver
Its a master timing rcvr from the simple research I have done. Must be fallout from the US LORAN C shut down. Anyhow The whole signal spec is here. http://www.navcen.uscg.gov/?pageName=loranSignalSpec Its a 8 MB zip I have done the 2000 procedure and it is complicated to say the least. Given the vintage of the 5000 it might be the same. But that was quite a while ago. Are you in the US? Regards Paul On Sat, Apr 13, 2013 at 9:21 AM, Rob Kimberley robkimber...@btinternet.comwrote: Hi, I don't know this model from Austron, but you could try asking fellow Time Nuts if anyone has a manual for the 5000 which should include the full calibration procedure. I know on the Austron 2000C the calibration procedure was quite a long to set it up correctly. I'm sure that the 5000 will be similar. Rob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of mehdi Sent: 13 April 2013 13:08 To: time-nuts@febo.com Subject: Re: [time-nuts] Questions about Austron 5000 Loran C receiver hi dears i'm newer here. i have some questions about loran-c receiver.can you help me? i want to know how can i find third zero crossing in loran-c receiver? i find third zero cross by peterson 's method from this paper: Analysis of Noise and Cycle Selection in a Loran Receiver but due to Gausian noise,when i find third zero cross,it is not correct and it is before or after correct third zero cross.i want to know how can i track and correct third zero cross?(in other words what is acquisition in loran-c receivers and how can i do?) have you any matlab code or papers or thesis for this problems? please help me? :( thanks a lot ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Questions about Austron 5000 Loran C receiver
An additional thought. The third cycle is not the thing you would see on a scope looking at the raw signal. The rcvr determines when the signal has risen above 0. That may be 1 to 2 really small cycles. Its from that point its the 3rd crossing. Normally there is a gate out signal thats useful to trigger the scope with. Regards Paul On Sat, Apr 13, 2013 at 10:55 AM, paul swed paulsw...@gmail.com wrote: Its a master timing rcvr from the simple research I have done. Must be fallout from the US LORAN C shut down. Anyhow The whole signal spec is here. http://www.navcen.uscg.gov/?pageName=loranSignalSpec Its a 8 MB zip I have done the 2000 procedure and it is complicated to say the least. Given the vintage of the 5000 it might be the same. But that was quite a while ago. Are you in the US? Regards Paul On Sat, Apr 13, 2013 at 9:21 AM, Rob Kimberley robkimber...@btinternet.com wrote: Hi, I don't know this model from Austron, but you could try asking fellow Time Nuts if anyone has a manual for the 5000 which should include the full calibration procedure. I know on the Austron 2000C the calibration procedure was quite a long to set it up correctly. I'm sure that the 5000 will be similar. Rob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of mehdi Sent: 13 April 2013 13:08 To: time-nuts@febo.com Subject: Re: [time-nuts] Questions about Austron 5000 Loran C receiver hi dears i'm newer here. i have some questions about loran-c receiver.can you help me? i want to know how can i find third zero crossing in loran-c receiver? i find third zero cross by peterson 's method from this paper: Analysis of Noise and Cycle Selection in a Loran Receiver but due to Gausian noise,when i find third zero cross,it is not correct and it is before or after correct third zero cross.i want to know how can i track and correct third zero cross?(in other words what is acquisition in loran-c receivers and how can i do?) have you any matlab code or papers or thesis for this problems? please help me? :( thanks a lot ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Questions about Austron 5000 Loran C receiver
See if this helps: http://www.leapsecond.com/museum/au2100f/scope.htm /tvb (iPhone4) ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Connectors
OK, so we seem to have: 1) Scotch 130 rubber tape 2) Scotch 33 electrical tape 3) Scotchkote in that order. So the rubber tape waterproofs the connection and the scotch kote protects it from UV, so what does the electrical tape do? Or maybe, the electrical tape does the waterproofing and the rubber tape just keeps goo off the connector. But of course, that can be done with the well known technique of winding the connector with electrical tape adhesive side out. Do we know that the rubber tape is not UV proof? Or none of the above. Can someone in the know clarify this? Thanks, Rick ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Connectors
Can someone in the know clarify this? I'm not in the know. Several years ago, I found a short chunk of coax that the cable TV guys had left on the ground. It included a piece of heavy wall shrink tubing. There was a layer of sticky goop between the coax and the shrink tubing. -- These are my opinions. I hate spam. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Connectors
Rick It is a very rare time I get to answer you. The plastic tape holds the rubber end initially, adds another layer of wx, and in reality is sacrificial to UV over the years. First the liquid rubber gives up. Then the plastic. Thats a big clue when it gets ratty. Time to change. Fact is even at that point it will hold for a very long time beyond that point. Each layer helps to hold things together. My experience was in the Navy aboard ship. But I have used the method for many years on the tower for all of the heliax and all other connections. What I would love to know is what makes the liquid rubber, liquid. It evaporates off over time (And it seems no matter how hard you try to seal the container) and that always kills off the can of scotchkote. I will bet I waste 1/2 a can that way. Regards Paul WB8TSL On Sat, Apr 13, 2013 at 2:56 PM, Richard (Rick) Karlquist rich...@karlquist.com wrote: OK, so we seem to have: 1) Scotch 130 rubber tape 2) Scotch 33 electrical tape 3) Scotchkote in that order. So the rubber tape waterproofs the connection and the scotch kote protects it from UV, so what does the electrical tape do? Or maybe, the electrical tape does the waterproofing and the rubber tape just keeps goo off the connector. But of course, that can be done with the well known technique of winding the connector with electrical tape adhesive side out. Do we know that the rubber tape is not UV proof? Or none of the above. Can someone in the know clarify this? Thanks, Rick __**_ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/** mailman/listinfo/time-nutshttps://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Connectors
On Sat, 13 Apr 2013 14:07:05 -0700, Hal Murray hmur...@megapathdsl.net wrote: Can someone in the know clarify this? I'm not in the know. Several years ago, I found a short chunk of coax that the cable TV guys had left on the ground. It included a piece of heavy wall shrink tubing. There was a layer of sticky goop between the coax and the shrink tubing. They make adhesive lined or dual wall heat shrink tubing for applications requiring a better seal: http://www.3m.com/product/information/Heat-Shrink-Adhesive-Lined-Tubing.html http://www.buyheatshrink.com/heatshrinktubing/3to1adhesive.htm ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] UPDATE: DATUM 9390-52054 Grief again...
On Fri, Apr 12, 2013 at 11:48:47AM -0700, Burt I. Weiner wrote: Sorry for the delay in posting this update. Things have been hectic, and then there was NAB. Here's what I've discovered: The receiver started working after about 6 hours of just sitting. However, the 9390's internal Vectron oscillator was quite a ways off frequency and did not want to lock after trying to stabilize all night. I had to tweak the adjustment screw quite a ways and then, after a while, it locked. Prior to this episode the oscillator had been sitting at only a few E-12. I suspect that this oscillator has had an intermittent problem for a long time, and I should not have had to tweak it as far as it wanted to go. The receiver portion has not failed in the few weeks since it decided to start seeing satellites again. Maybe because I had tweaked the oscillator? I have an ancient 9390 that has an ancient Trimble GPS board in it that takes a 16.368 reference synthesized from the 10 MHz standard in a PLL loop with a VXCO. This is used in the L band downconversion... and for timing generally and given that is PLL derived from the 10 MHz quite likely if the 10 MHz is significantly wrong the receiver won't find satellites. I remember I had to fix this PLL in my box before the receiver in that box would lock up... initially the PLL wasn't locked, but the 16.368 VCXO output WAS present - so for that receiver it has to be pretty close to right on to work. -- Dave Emery N1PRE/AE, d...@dieconsulting.com DIE Consulting, Weston, Mass 02493 An empty zombie mind with a forlorn barely readable weatherbeaten 'For Rent' sign still vainly flapping outside on the weed encrusted pole - in celebration of what could have been, but wasn't and is not to be now either. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Connectors
Think of heat shrink with a layer of hot melt glue on the inside. Such stuff is used in most outdoor and especially underground utility wiring. Shrink the tubing and it melts the glue and the contracting tubing forces the glue into every crevice making a great waterproof splice. On 4/13/2013 5:07 PM, Hal Murray wrote: Can someone in the know clarify this? I'm not in the know. Several years ago, I found a short chunk of coax that the cable TV guys had left on the ground. It included a piece of heavy wall shrink tubing. There was a layer of sticky goop between the coax and the shrink tubing. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Connectors
Yes its from the heat shrink. When they shrink the wrap it forms an air proof seal. Regards Paul WB8TSL On Sat, Apr 13, 2013 at 5:07 PM, Hal Murray hmur...@megapathdsl.net wrote: Can someone in the know clarify this? I'm not in the know. Several years ago, I found a short chunk of coax that the cable TV guys had left on the ground. It included a piece of heavy wall shrink tubing. There was a layer of sticky goop between the coax and the shrink tubing. -- These are my opinions. I hate spam. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Connectors
Kind of a cool technology -- they bombard the outside of the tube with an electron beam that cross-links the polymer but leaves the inside untouched. The outside becomes hard but still shrinks. The inside just melts into a goo when heated. Dave -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Peter Gottlieb Sent: Saturday, April 13, 2013 15:24 To: time-nuts@febo.com Subject: Re: [time-nuts] Connectors Think of heat shrink with a layer of hot melt glue on the inside. Such stuff is used in most outdoor and especially underground utility wiring. Shrink the tubing and it melts the glue and the contracting tubing forces the glue into every crevice making a great waterproof splice. On 4/13/2013 5:07 PM, Hal Murray wrote: Can someone in the know clarify this? I'm not in the know. Several years ago, I found a short chunk of coax that the cable TV guys had left on the ground. It included a piece of heavy wall shrink tubing. There was a layer of sticky goop between the coax and the shrink tubing. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Connectors
On Sat, Apr 13, 2013 at 6:58 AM, brent evers brent.ev...@gmail.com wrote: Scotchkote! Yes - Thank you for the correction! The other could lead to disaster! Nope - not ex-navy. Its pretty standard practice in the offshore world. My time was spent on research vessels down in Antarctica. I used to own a sailboat. I used almost the same thing. Liquid rubber' as sold at Home Depot it comes in a can with a brush attached to the lid. It was especially good for bolted connection used on batteries. The boat had 6 large (50+ pounds each) lead acid wet cells and then each connects to a 250 amp fuze and a switch and so on. There were many bolted connecters with #00 cable. Quite a few antenna leads too with GPS, HF and VHF radios and radar. Nothing like on a large ship but still tons of wire. In all of this I never have much trouble with the connectors. Problems where with the wire itself. It would be nicked or abraded or the space between the connecter and insolation would allow water or damp air to get in and it would wick down the cable and after time corrode the coper and turn it into green goo. The design of these new kind of compression connectors, the ones that require axial force to install is that there is a rube seal that goes over the outer insolation jacket. This seal keep water out of the most critical place. The liquid rubber paint works well too. -- Chris Albertson Redondo Beach, California ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
