These days a GROL which used to be known as a 1st/2nd class RadioTelephone license is only necessary for aircraft and marine installations. A marine radar installation has to be done by someone with a radar endorsement. Additionally the GMDSS operators/maintainers licenses *may* also be necessary for a radio installation. If the Tall Ship ever takes on passengers, that might trigger more stringent requiements. Michael Monsour
On Fri, Jul 28, 2017 at 12:26 PM, Leslie Bartosh via BVARC <[email protected]> wrote: > Thank you Jon: > > I will freely admit I am out of my element in hf maritime installations, > especially in this case where we are dealing with an antique ship. > > I am really trying to find someone who can do the job. > They are willing to pay for the service. > I am just trying to the leg work for them. > > They will ultimately want vhf, hf and perhaps radar installed. > > Thank you once again. > 73 > Leslie, ad5wb > > ------------------------------ > *From:* Jon Livingston kb0mnm via BVARC <[email protected]> > *To:* "BVARC, GMuller885---" <[email protected]> > *Cc:* [email protected] > *Sent:* Friday, July 28, 2017 12:03 PM > > *Subject:* Re: [BVARC] marine radio installation > > I have done some work with marine radio installation on fresh-water > vessels and also have insights for salt-water. > 1. Fresh-water VHF is a snap( I agree ). Simply use a well-waterproofed > thick metallic plate of at least 18" by 24" for a ground-plane below a > standard NMO heavy-duty constructed antenna. > My favorite was a left-over mounting plate for G.E. radios that you might > see at hamfests. > While this works for 5/8 wave antennas near 2 meter frequencies ( > actually, we were a bit higher for public safety & marine ), the > quarter-wave antennas with good bandwidth ( eg. Maxrad coil ) seemed to > last longer. > Use heavy-gauge DC cabling ( think welding cable ) for longer runs and go > back to the DC source. This keeps the voltage drop low, so the radio is not > 'starved'. > 2. HF installations do require some sort of ground plane also. You will > always need a 'difference' between elements, yet the 'ground' side does not > have to actually contact the water. > The problem is that as the hull moves, any 'artificial ground' is moved in > relation to that. Do not be fooled by ads for 'artificial ground' products, > some do not work with transmit ( yet are fine for receive ). > 3. Salt water power sources very often used to involve frequencies other > than 60 hz. Do not 'guess' or contract the word assume that if the voltage > is correct, you can connect a standard amateur radio. > You may be able to charge batteries and then run an inverter, yet the > cheaper inverters tend to make noise on the lower frequencies which are > best for worldwide communications. > 4. New 'Copperweld' wire typically is stronger due to stainless or other > than copper core. The stuff you can buy anywhere ( all copper ) has a > tendency to droop. > Any place where you mate dis-similar ( different ) metals, corrosion is > accelerated. It is also accelerated by salt water. Chemicals such as are > used to make aluminum to copper hookups for stoves and dryers in households > can slow this yet may not tolerate heat and salt for long. Where you > actually want to preserve iron, there are alloys used in hot water-heater > heaters for the 'sacrificial' anode. > I hope that all helps. More experienced amateurs, feel free to 'correct' > or improve the above. > 73 KB0MNM Tech. for MnDOT assisting DNR, AT2-USN-USS Midway ( CV-41) ret. > 1987 > > ------------------------------ > *From: *"Leslie via BVARC" <[email protected]> > *To: *"SETX Telecom" <[email protected]> > *Cc: *[email protected], "BRAZOS VALLEY AMATEUR RADIO CLUB" <[email protected] > > > *Sent: *Friday, July 28, 2017 11:33:28 AM > *Subject: *Re: [BVARC] marine radio installation > > Thank you. > I will do so. > > On Jul 28, 2017, at 11:23 AM, SETX Telecom <[email protected]> wrote: > > I've done marine radio work in the past...HF is s special art on boats > requiring RF ground...VHF and radar are a snap....sometimes a copper plate > is used as a protector to the hull and placed where it contacts the water > ...providing similar protection like Zinc does on a tower section...it > sacrifices itself to protect what's beneath...sometimes there is no ground > connection to the hull and the entire radio system floats, so to speak, to > prevent galvanic corrosion action. > > Email directly and we can chat... > Chris > WB5ITT > [email protected] > > On Jul 28, 2017 11:08 AM, "Leslie Bartosh via BVARC" <[email protected]> > wrote: > > Hello All: > > My name is Leslie, ad5wb. > > As some of you know I am involved in activating the 1877 Tall Ship Elissa > during Museum Ships Weekend. > During this years activation the Bosun asked me if I knew anything about > installing radios on ships. > > I do not know anything about the subject. > Does anyone here have any practical experience with installing marine band > and hf radios on ships? > OR > Any suggestions for individuals or companies who can do the job > appropriately? > > They are understandably concerned about the introduction of any form of > electrical current to the iron hull of the Elissa. > They had to redo the entire hull after hurricane Ike, due to the > introduction of electrical current to the hull. > > Thanks for reading. > 73 > Leslie, ad5wb > > _______________________________________________ > BVARC mailing list > [email protected] > http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org > Message delivered to [email protected] > > > _______________________________________________ > BVARC mailing list > [email protected] > http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org > Message delivered to [email protected] > > _______________________________________________ > BVARC mailing list > [email protected] > http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org > Message delivered to [email protected] > > > > _______________________________________________ > BVARC mailing list > [email protected] > http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org > Message delivered to [email protected] > >
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