jerryj2me

Members
  • Content count

    1,742
  • Joined

  • Last visited

Community Reputation

0 Neutral

About jerryj2me

  • Rank
    Super Anarchist

Recent Profile Visitors

14,737 profile views
  1. jerryj2me

    Electrical Issues

    Start with a voltmeter on the device showing bad behavior, then do whatever it is that causes the problem. See if the voltage drops a lot (more than a volt) Sounds to me like you got a power dropping down while under load sort of thing. That voltmeter will be your friend to finding out why.
  2. jerryj2me

    Heat treating stainless

    A good idea that I would take one step further - Don't freehand it on grinder. Mount it in a milling machine and accurately machine out the faces of the wrench. Find the closest metric or imperial wrench that is too small and use that as the starting point. That way you are taking off less than 1 mm or less than 1/16 of an inch.
  3. jerryj2me

    Disposal of out dated flares & shells

    This. Most local fire departments in the USA will take hazardous materials and deal with proper disposal.
  4. jerryj2me

    Is this bad?

    Very cool love the color scheme. Did not know you could get high temp paint in those colors, but that will be a conversation starter for many moons I am sure.
  5. jerryj2me

    Troubleshooting handheld vhf

    Does it have a WX button that does not respond? Could be another switch that needs cleaning. As a general rule, the mechanics of these devices (Switches, battery contacts, etc) tend to fail more than the electronics (chips, transistors circuit boards) Not always the case (electrolytic capacitor fail a lot) but its a common theme.
  6. jerryj2me

    Troubleshooting handheld vhf

    Was it a handheld that got used a lot? If so, the PTT button contacts may be messed up, worn or dirty. If you can take apart the PTT button and clean the contacts that may bring it back to life. Also, soaking the switch in some electronic contact cleaner may help wash the internals of the switch clean. (PTT = Push To Talk)
  7. Well, this conversation is down to two people and one of them seems to want to lecture me. Have a nice day.
  8. jerryj2me

    Small Guage WIre Boots for Yanmar Sensors.

    Slip heatshrink tubing over the whole thing and use a heat gun to shrink in place over the sensor to the wire.
  9. God I hate it when somebody asserts themselves as an authority and doesn't know WTF they are talking about. The original GSM systems (the old ones) have a dynamic range of 91 dB http://www.analog.com/en/analog-dialogue/articles/wideband-radios-need-wide-dynamic-range-converters.html Read the above if you don't believe me. Also if you read the below, you will see illustrated that on a good day you can get to 115 dB of dynamic range: http://www.radio-electronics.com/info/receivers/dynamic_range/dynamic_range.php Which is why in my prior post I sort of handwaved and called it over a 100dB. Depending on which cellular standard we are talking about they range from 91 to IIRC 106dB. As well, if you think that you are just connecting up an 6-8 bit ADC to the damned antenna, you have obviously never designed a cell phone receiver in your life. Considering my last 2 boats were largely paid for from contracts working for Motorola, Broadcom and Qualcomm I got a different story to tell. Rant off...
  10. jerryj2me

    Dinghy spinnaker chute bag.

    If a local sail loft won't do it for you, toss it at a remote loft to make, or even find someone on Etsy to do a custom build for you. Define and design yourself, and if fabrication isn't your thing throw the sketch at the right people. Give them an old sail bag from a bigger boat to steal the materials from in the way of cloth. Any canvas shop should be able to fabricate.
  11. 20km? It's possible but won't be a slam dunk. The frequencies are all line of sight. (800MHz to 3GHz) and the visible horizon is 6 miles (9-10 km) out standing on the shore. Higher towers will extend that distance somewhat. http://www.ringbell.co.uk/info/hdist.htm With the above you can take a 100 foot tower and hit 12.3 miles out, which is 19-20 km. A weak signal however may have issues, but cell phones have some impressive dynamic range with the capability to take signals successfully with over 100dB of dynamic range. (really weak to very strong if you ditch the geek speak) YMMV
  12. jerryj2me

    engine starter troubles

    Start by measuring all your voltages from the ground post of the battery. Find out what ground voltage is at the engine when cranking or trying to crank. If that pops up to more than 0.5 volts you got a crappy ground from the battery. After you fix your ground side, try it again at the battery feed to the solenoid (stick with that ground post on the battery) That should be 12V-14V without trying to crank, and be 10V or better when cranking. (numbers may vary) After fixing the battery to solenoid side, see if the starter side of the solenoid has a similar set of voltages as the battery side. When cranking they should be less than 0.2V difference. (preferably less)
  13. jerryj2me

    Batt Water Unequal

    Good article for sure. The one thing I would add to the article is the importance of properly building the cables and their connector crimps. Buy a hydraulic crimping tool ($30 on EBay), use the right size crimps for the wire, and be careful in making the crimps properly. I just redid a classic car and the prior owner had done all the high amp cables crimps by smashing with vice grips.
  14. jerryj2me

    Is this bad?

    Do her a favor and substitute a diesel in for the A4. Hell, it's your daughter and nobody has to explain the safety and reliability advantage of the diesel. http://www.betamarinenw.com/Applications/atomicfour.html More work to convert but it's not a killer.
  15. jerryj2me

    Maker Space/DIY Boat Repairs?

    Down here in San Diego: http://makerplace.com/ Full end to end wood and metal shop, 3D printers, CNC cutter machines CNC laser cutter tables, a professional paint booth, and a whole lot more. Costs me $170 month as a member, and it works well for those people who don't have a huge garage space for a shop.