Re: Re : [Amel] Pulling the mast (triatic issues)


svperegrinus <no_reply@...>
 

Hello,

The triatic on SM #350 (October 2001) has insulators and a cable runs from the insulated portion and into the mizzen mast. On this thread, people generously contributed the following:


- On SM #387 - The coax from the triatic is nicely looped, connected to nothing, behind the right side instrument pull-out. I will check on #350 to see what's up

- On Mark Pitt's, the triatic is used as the DSC antenna for his Icom M802 and it was so installed by Pochon. Effectively, DSC-enabled SSBs require two SSB antennas.

- RP from SM #209 recommends the insulators be maintained during re-rigging to prevent galvanic issues and as protection when hit by lighting.

- On Mango #51, an SSB whose backstay antenna is further bridged to the triatic provides better performance than an SSB connected to the backstay only. The tuners however are different, so could the performance difference be attributed to the tuners? RP indicates that frequencies on longer wavelengths will benefit from the extended antenna resulting from bridging.

- JB from SM #232 indicate the triatic would be ineffective for VHF (others indicate because of length).

- From other threads, apparently on some SM's the navtex antenna was the triatic?


Based on the above, it looks like the insulators should be maintained on the triatic for galvanic protection and potential SSB DSC future use.

Also, the coax lead down the mizzen mast should be kept. Even though elsewhere on the forum the GAM / McKim Split Lead Antenna is recommended and would be a cost-effective replacement to the white 8m whip SSB antenna and to insulated backstay SSB antennas, running an SSB DSC cable to the port backstay would be a supreme headache.


F + O
s/v Peregrinus
SM2K #350, October 2001

--- In amelyachtowners@..., Richard Piller wrote:

The length of the backstay with or without the triatic as with all SSB antennas
has to do with the wave length(s) you are using. The longer the wave the long
wire/antenna. Yes, the turner also works to adjust for different wave lengths
and power out put. The fact that the triatic is horizontal to plan/sea
reflection of the signal may be greater and therefore give you a better signal
both coming and going. The tuner does the rest. You can get really good
reception if you get a directional antenna like the type Southbound 2 uses. Not
the best idea for a boat...
All the best from Annapolis. SM 209 For Sale...
Richard Piller






________________________________
From: Serge Tremblay
To: amelyachtowners@...
Sent: Tue, March 1, 2011 1:24:16 AM
Subject: Re : [Amel] Pulling the mast


With 2 installed SSB with separate tuners, one only connected to one backstay
and one connected to the other backstay with a connection to the triatic, I have

found that the set connected to the backstay and triatic to be more performant.

However, I am not shure if the difference is not due to the tuners. The longer
antenna is tuned with a SGC (237) tuner, the other with a Icom AT 130.

Serge , Le Marin, Martinique
Opera, Mango 51

________________________________
De : "bsarff@..."
À : amelyachtowners@...
Envoyé le : Lun 28 février 2011, 23h 22min 02s
Objet : Re: [Amel] Pulling the mast



Is there any advantage to hooking up a jumper between the top of the insulated
back stay and the triatic to increase antenna length of the SSB antenna? The
actual antenna connection would be at the base of the back stay, just above the
insulator.

Bob


----- Original Message -----
From: karkauai@...
To: amelyachtowners@...
Sent: Sunday, February 27, 2011 9:09:01 AM
Subject: Re: [Amel] Pulling the mast



I think they had both the whip and triadic hooked up with a way toggle between
for ssb voice and fax respectively. Not VHF.

Kent
Sent from my BlackBerry Smartphone provided by Alltel

-----Original Message-----
From: Richard03801 < richard03801@... >
Sender: amelyachtowners@...
Date: Sun, 27 Feb 2011 10:18:06
To: amelyachtowners@... < amelyachtowners@... >
Reply-To: amelyachtowners@...
Subject: Re: [Amel] Pulling the mast

Kent the weather fax is an SSB signal so when so connected you have tdy/fax
second weather fax is an "off" wave length signal.
It does NOT work well for VHF as it is to long

Regards
Richard Piller

On Feb 27, 2011, at 10:04 AM, karkauai@... wrote:

I seem to remember someone on this forum saying they actually picked up
weatherfax better using the triadic than using the whip. Maybe even used the
whip for voice and triadic for fax? Others have said that orientation vertically

would almost always give better performance than when horizontal. All seem to
agree that the antenna tuner should be as close as possible to the antenna.
Makes one wonder why Amel put it in the triadic. Joel?

Kent
SM243
KRISTY
Sent from my BlackBerry Smartphone provided by Alltel





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