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#1 |
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Registered User
![]() Join Date: Aug 2007
Location: Texas
Boat: Condor40 - Trimaran
Posts: 5
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Using SSB longwire for Navtex fax receiver?
I'm installing a Fururno Fax-30 receiver and am wanting to use my Marine HF longwire antenna as it's antenna, too, without of course frying the Fax-30 if/when transmitting on the HF.
I'm looking at antenna switches, but am trying not to have to extend the HF antenna cable off back of the tuner, in rear of boat, and then into the cabin for the switch and then back out again to the antenna, etc. On the cheap, could I instead simply utilize a hefty alligator type clip on the end of the Fax-30 antenna cable where I'd leave it clipped onto the longwire to recieve navtex and faxes and then remove it if needing to transmit on the HF? Or, is there another better removeable connection I should explore using? Any other suggestions or cautions to consider here? Thank you, Shane |
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#2 |
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Administrator
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Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: C.L.O.D. (Cruiser Living On Dirt)
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Alpha Delta “Delta2B” ?
Alpha Delta Communications
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Gord May ~~_/)_~~ (Gord & Maggie - "Southbound") "If you didn't have time/$ to do it right in the first place, when will you get the time/$ to fix it?" |
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#3 |
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Registered User
![]() Join Date: Apr 2007
Posts: 83
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Unplug the connector from your SSB and plug it into the common port of the coaxial switch. Then make up two coax cables for the SSB and FAX.
Eric |
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#4 | |
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Registered User
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Thanks, GordMay, was looking at MFJ Products, but now got a Alpha Delta 2B ordered.
Quote:
- Shane |
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#5 |
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Administrator
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Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
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I’ve installed (but never used, myself) owner supplied MFJ-1702C Antenna Switches, which (I believe) are cheaper than the Deltas.
Perhaps Bill < btrayfors > could weigh in on the relative merits of these products (and/or other solutions)?
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Gord May ~~_/)_~~ (Gord & Maggie - "Southbound") "If you didn't have time/$ to do it right in the first place, when will you get the time/$ to fix it?" |
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#6 | |
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Registered User
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Posts: 83
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Quote:
Eric |
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#7 |
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Registered User
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Location: Ft. Lauderdale
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The NAVTEX receives at a medium frequency and should come with it's own antenna. My Furuno NAVTEX did, a white mushroom type antenna.
It does not have to be mounted high as the signals follows the curvature of the earth. I would not screw around with the SSB antenna, you forget to flip the switch one time and you are sending 150 watts of power into the NAVTEX, then the party is over.... ![]()
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If you can read this, I have too much time on my hands..
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#8 |
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Registered User
![]() Join Date: Apr 2007
Posts: 83
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The Furuno Fax30 is a Weatherfax/Navtex receiver. The FAX5 active coupler/antenna is an additional very expensive option for this receiver. It is very common to use the SSB antenna as a shared antenna between a weatherfax and SSB. If the switch is in the wrong position, you will not be transmitting into your Fax but will be transmitting without an antenna connected. The simple solution is to put a permanent tag next to your microphone reminding you to check the switch before transmitting.
Eric |
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#9 | |
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Registered User
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Location: Texas
Boat: Condor40 - Trimaran
Posts: 5
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Quote:
http://www.furuno.com/Furuno/Doc/0/A...01.22.2003.pdf The mushroom antenna you mentioned sounds like a gps antenna or sat antenna for the Furuno Sirius weather receiver. Edited to add: Yes, sorry, I did find Furuno has other Navtex units with smaller antennas like you described. Regardless, yes, I agree, I sure don't want to fry the unit with the SSB. - Shane Last edited by shanec; 02-08-2007 at 10:58. |
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#10 | |
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Registered User
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Location: Texas
Boat: Condor40 - Trimaran
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Quote:
- Shane |
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#11 |
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Yes, but as I said, you will not be transmitting into your Fax. And I don't know what SSB you have, but most modern ones have high swr protection and will fold back the power if you try transmitting into an open circuit. It's also quite evident that the coax switch is in the wrong position when you hear very little noise from the SSB speaker. But still, a warning tag is a good idea.
Eric |
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#12 | |
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Registered User
![]() Join Date: Aug 2007
Location: Texas
Boat: Condor40 - Trimaran
Posts: 5
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Quote:
This weekend I'll get the specific model number for that ICOM tuner and then see what more I can find out about running the Fax-30 through it, good/bad/ugly. Thanks, all, for your input here. - Shane |
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