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ka4wja ka4wja is offline

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Showing Profile Comments 1 to 10 of 13
  1. CatPeople
    Hi John, Stan Honey has a well-known article about grounding boat systems including radio. He suggests copper foil grounding connector and to avoid potential issues with galvanic corrosion, suggests creating a bridge between ground foil and metal through-hull using several 0.15 uF capacitors in parallel that bridge a gap in the ground foil's continuity. This lets RF through but blocks DC current that might cause corrosion issues. Do you know anything more about how to design this - what voltage capacitor and how many are recommended. How much RF current is flowing through the ground foil when using typical marine or ham HF bands and up to 150 W of transmitter power? Appreciate any info or insights you can provide. I was not able to find much at all in terms of these details on the internet. Thanks, Charlie
  2. AndDavRos
    Good evening John,

    In some of your posts you mention a 'Rope Antenna'. Is this the antenna made by w3ate with the element actually inside of a rope? Have you used these, and if so, what are your thoughts on them? I came across this idea a while back and liked it, but haven't been able to find anyone who has used it. Any inputs would be appreciated.

    73's,
    Shawn
    KD7FPS
    S/V Firefly
  3. jefndeb
    Hey John...Jeff here in Savannah.... Would you happen to know if Icom can replace the LCD on the M802 remote control ?...this one here I have is in need of replacement.
  4. cynthia-m
    Hi John,

    Thanks for all your input and suggestions on how to recoup from the hacker here in Clearwater, FL. You took the time to explain things very well.
    I have met the owner at Mack Sails before, over in St. Pete. I will be contacting him to see if her or someone he knows can help out with the repairs.
    We'll need to redo the botched fiberglass repair, deck paint, stainless steel rails, toe rails and refit of the headliner done, some other small jobs too.
    No sail or rigging work needed at this time though.

    Regards!

    Cynthia
  5. jefndeb
    John,

    My base radio here in the shack is an Icom 7300 and (you probably already know but man this radio is really good),....

    We will be buying a cruising sailboat within a year or so and being a Ham myself we will have a SSB system installed.

    To be safe,..I have bought a new in the box M802 system in case the boat we buy doesn't have a SSB installed.

    Question is, other than the 50 watt difference and pre-programmed Marine SSB Frequencies, why would I not go with a 7300 as apposed to the M802?

    Your opinion please....

    Jeff in Savannah
    KM4GGH
  6. BillyPuffin
    Hi. I saw you had heavily tested the Vesper SP160. I have a hopefully simple question: if the splitter is powered down is the insertion loss for the VHF RX/TX the same as when it is powered?
    I am going to install their Class B unit and it will be on the VHF power circuit. However I am going to install a hidden switch panel to a) Put it in Silent b) Turn it off with the VHF still on. The VHF has a decent built in AIS receiver which is all I normally use, but I want to have the AIS B on when my kids are using the boat (!) without them being able to easily turn it off. Do I need to leave the splitter on all the time I suppose is the question.
  7. caxton
    Hi, I am taking my mast down to replace the standing rigging and would like some advice on an AI/VHS antenna and the cable I should choose. I am installing a Raymarine AIS650 with a Raymarine AIS100 AIS/VHF splitter so I can use the same antenna. You probably have answered this already in you posts, but I have just discovered them and thought I might just ask you directly since my mast in on the way down today! Thank so much. Caxton
  8. dcwebme
    Hello John,,
    Thank you for all the info you have posted. I hope you can direct me to a specific area to read or to post this question and hope it is OK to contact you in this manner for direction and advice.


    I am working on installing M-802 on a Nauticat 33 Ketch. The best "backstay" for an antenna is one of the two split mainmast stays that terminate on the top of the cabin before the aft deck. The easiest location for the AT is in the aft locker, directly below and perhaps four feet below cabin top. This locker is located between the aft cabin sleeping area and the seating in the pilot house. Thus the antenna lead would run close to a sleeping area and a lounging area on its way to the backstay. My concern is regarding RF exposure. Would it make more sense to put the AT directly under the cabin top where backstay starts and reduce the antenna lead length? This greatly increases the ground strap installation. Thanks, David
  9. galbizua
    Hi John !! I am Guillermo, a beginner in ham, CP6GA,living in Bolivia.
    I bougth a radio Icom 802 and IT 140 tuner to install in my house.
    I would like to know how to connect a dipole antenna to the tuner, because it has a terminal for the antenna at the top, but that's not a coaxial connection.
    The other connection is grounded.
    It should connect the dipole one on land and the other to the output of the antenna?
    Many appreciate your comments
    Guillermo
  10. carlylelk
    I saw your recent post on SSB. We recently bought a sailboat with an SSB, which I have no experience with. Thanks for posting all the links, I'll be looking into them.

    Duane

About Me

  • About ka4wja
    Vessel Make/ model
    Catalina 470
    Vessel Name
    Annie Laurie
    Location
    Florida
    Occupation
    semi-retired engineer
    Interests
    Electronics, Ham Radio, Teaching,
    Biography
    http://www.qrz.com/db/KA4WJA

    and

    http://www.c470.jerodisys.com/470pix/foto_bot.htm
  • Signature
    John, KA4WJA
    s/v Annie Laurie, WDB6927
    MMSI# 366933110

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  • Join Date: 14-05-2007
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