Quelle antenne pour un NAIM NAT ?

[JR]

Nous savons tous que NAIM a toujours fabriqué d'excellents tuners. Mais aussi que les tuners NAIM exigent une excellente antenne car, contrairement à beaucoup de leurs concurrents, ils nécessitent un signal fort.
La marque conseille la Rolls de l’antenne FM, à savoir la marque Ron Smith.
Le modèle Galaxie 17 composé de 17 éléments et qui offre un gain de 16 db fait parfaitement l’affaire.
Cependant, si vous ne pouvez pas installer un modèle de toit, il existe 2 autres antennes distribuées par Sélectronic sous les marque Metz et Fanfare..
Pouvant être installées dans un intérieur ou sous le toit, d’un prix inférieur à 100 euros, elles offrent des résultats remarquables, sans commune mesure avec les antennes « souples » que l’on trouve dans les commerces.
Le câble a également son importance. Veillez à bien observer qu’il possède une impédance stable de 75 ohms et qu’il soit blindé. Ne pas lésiner sur les connecteurs en employant des fiches au corps en métal.
Ayant un NAT02 relié à une antenne Metz, installée dans mon intérieur, je peux vous assurer que sur une émission de qualité, la restitution est d’une telle distinction et d’un tel raffinement que l’on a l’impression d’écouter un haut-parleur large bande

[RV]

Bonsoir JR,

Il me semble qu'on parle des antennes dans un post consacré aux tuner. Il doit même y avoir une photo de l'antenne omnidirectionnele de Fanfare qui d'ailleurs ressemble comme 2 gouttes d'eau à la ST2 de Magnum Dynalab que j'ai.

à+

Hervé.

PS : sur ce thread il y avait aussi je crois un lien vers les tuners vintage, mais au cas où ma mémoire me jouerait des tours je le reposte

http://www.fmtunerinfo.com/

[Bouarb]

Vous n'auriez pas une page où je pourrais aller les antennes Selectronic ? Ca m'interesse...

[JR]

Ci-dessous l'adresse du produit :
antenne FANFARE : http://www.selectronic.fr/article.asp?a ... =60.1124-1
antenne METZ : http://www.selectronic.fr/article.asp?a ... .0553-9999

[Bouarb]

Merci beaucoup !

Si j'ai bien compris, il suffit juste ensuite de rajouter le câble de raccordement, et on a un super antenne, c'est ça ?

[JR]

Bonjour Bouarb.

Voici les accessoires pour chacune des antennes :
- câble réf. 50.8013 noir en extérieur ou réf. 50.8017 blanc pour intérieur.
Il s'agit d’un câble professionnel à faibles pertes, répondant à la norme C90131 de capacité 56 pf/m, d’impédance 75 ohms et d’atténuation 6,35 db/km à 120 Mhz (le top).
- connecteur UHF mâle étanche réf. 50.5870.5 (contact doré)
- fiche mâle modèle professionnel, tout métal (et cela s’entend sur mon sytème) réf. 50.5866-1
chez www.SELECTRONIC.fr Service Technique 0 820 720 318 le mardi et vendredi de 9h à 12h30, le mercredi de 14h à 18h.

[Cyrus68]

Bonjour,

En câble coaxial, on peut aussi utiliser l'excellent Belden 1694A . Mais rapport qualité/prix le câble réf. 50.8013 me semble meilleur.

Bien cordialement.

[bernard lapeyre]

J'utise pour ma part l'antenne collective que j'ai fait installer(gratuitement)
par la societe gestionnaire de l'immeuble. le resultat est tres satisfaisant le signal du tuner est au max.
par contre je voudrais savoir s'il existe un distributeur français des antennes RON SMITH merci pour le tuyau SELECTRONIC je refais tout mes passages de cables et j'y vais demain, en plus les prix sont tres abordable, pour ne pas dire"donne" 1,70 euros la fiche metal.
peut adapter un connecteur type F sur les naim?
A+
bernard

[Cyrus68]

Bonsoir,

Les antennes fouets (Fanfare ou Magnum Dynalab) sont-elles aussi performantes pour la réception des radios FM émises en polarisation horizontale ?

Dans mon secteur géographique, les radios publiques du groupe "Radio France" sont émises depuis l'éméteur TDF "Le Belvédère" (68100 Mulhouse) en polarisation horizontale, d'où ma question.

Merci. A+

EDIT

bernard lapeyre >
L'auteur du site anglais http://humbershipping.fotopic.net/ avait rédigé des renseignements concernant ces antennes, en particulier le modèle Galaxie 23 (Gain: 19.2 dBs !), sur un site internet qui est maintenant fermé ( http://www.arcticcorsair.f9.co.uk/ ). On trouve encore le texte en cache sur Google :

http://209.85.129.104/search?q=cache...

Ron Smith GALAXIE 23 FM Antenna


The G23 as installed at my home. (Photo copyright Mick Evans)



As you will probably have guessed by now, I never do anything by half and my continued interest in radio is no exception to the rule.

I have been fascinated by radio for more years than I care to remember now. I think my earliest interest in radio was when my father bought me a HARRIER portable radio that could pick up Aircraft and the local Police when they were located at the top of the VHF FM band. I distinctly remember also listening to Radio Moscow (as it was then) on a very cheap pocket radio that had the bonus of having the Short Wave bands.

In 1992 I took the UK Radio Amateurs Examination and subsequently acquired the the callsign of G7NNT. I was quite an active member of the Radio Amateur fraternity in this area but like so many other, work commitments put paid to that and I became interested in High-End audio. If I though Radio was expensive then that was nothing compared to this.

With a bit of prompting from friends I decided to take up the study of morse code again with the ultimate aim of getting a full Radio Amateurs licence. In early 2001 I passed the 12wpm morse examination and upgraded my callsign to M0NNT. I had intended for the full license to be a stepping off point for rekindling of my interest in Amateur Radio but for whatever reason it wasn't to be and i've stuck with the high-end audio. For the record, i've never lost the interest in radio - it's just that i've pursued it in slightly different ways by reverting back to my roots as a listener.



Anyway, when I purchased my Audiolab 8000T, I was definitely in need of an antenna that could keep up with it. I had a look around and pondered the APS range of antennas but settled on using a kit-built RON SMITH Galaxie Antenna. This particular antenna started life in mid-1998 as a 17 element and in late 2000 I added the extension kit and upgraded it to a 23 element.

The antenna itself is fed with u-100 double-screened coaxial cable and is mounted externally on a purpose designed radio mast at 30 feet above ground level. The mast was a relic from my Amateur Radio days and has come in quite handy for mounting my FM antennas. I did get back into Amateur Radio to a point and the Galaxie now shares the mast with an original Diamond X-300 Dual-Band Colinear vertical antenna that is sometime used for transmitting around the local area.



The inimitable, RON SMITH GALAXIE 17 VHF Antenna


A Galaxie 17 installation (Photo courtesy Ron Smith)



As you could probably guess, I am always delighted at the superlative results obtained from the Audiolab Tuner/ Galaxie 23 Antenna combination.

The main transmitting stations in my area are located at Belmont in Lincolnshire, Emley Moor and Holme Moss in West Yorkshire. The transmitter at Belmont is at an approximate distance of 80 miles away whilst the Emley Moor transmitter at is at a distance of some 90 miles.


Galaxie 23 installation at my home. With two folded dipoles also seen mounted on the mast. (Photo copyright Mick Evans)



The Galaxie 17 is the most popular mode in the Galaxie range. When used as a fixed array, the relatively wide acceptance angle can allow several transmitters to be received within the 3dB points and the low windload enables the use of a single steel, or scaffold grade alloy mast up to a length of twelve feet provided that at least one fifth of the mast is below the top fixing point.

On rotator use the 17 is the maximum load for an unaided lightweight rotor provided the submast is kept to a maximum of 20 inches (50cms). In cases of doubt, use an alignment bearing or a heavy-duty rotator.

Larger models of the Galaxie antennas are available to order from the manufacturer. The largest model available off the shelf is the G23. In the models greater than the 17, a special outrigger element needs to be fitted to the boom to reduce flexing and wind damage, in the 26 / 29 and 32 element models this outrigger is replaced by a Geodetic frame (in essence, twin booms!).

In real world usage, the G17 is ideal for most listeners. For DX or long distance listening the G23 is likely to be more useful. With its high side rejection, tight acceptance angle at 15 degrees and virtually flat response between 3db points, the G23 is the ideal tool for DXing. However even with perfect mechanical and dynamic balance, wind loading is still high and requires the use of either an alignment bearing or a heavy duty rotator.





Galaxie 17 SPECIFICATION

* Gain: 15.9 dBs
* Acceptance Angle: 45 degrees
* Front to Back Ratio: 33.7 dBs
* Windload @ 100mph: 50 lbs
* Height: 33 inches
* Length: 74 inches
* Width (maximum): 69 inches



Galaxie 23 SPECIFICATION

* Gain: 19.2 dBs
* Acceptance Angle: 15 degrees
* Front to Back Ratio: 36.8 dBs
* Windload @ 100mph: 72 lbs
* Height: 33 inches
* Length: 134 inches
* Width (maximum): 69 inches



Ron Smith Aerials can be contacted at the following address.

RON SMITH AERIALS
98 Ash Road
Luton
Bedfordshire
LU4 8AQ

TEL: (01582) 736561
FAX: (01582) 733686







A G17 installed in Vertical mode. (Photo courtesy Ron Smith)



When used in this manner, a Galaxie17 mounted for vertical use will have a wider acceptance angle somewhere in the region of around 8-10 degrees. This makes the beam width a bit wider and so stations may be picked up that were previously missing because they were nulled out by the narrow beamwidth when run in the traditional horizontal mode.





An ORION 10 seen here installed by a Dutch listener.



A nice side view of my Galaxie 23. (Photo copyright Mick Evans)




Truncation to 20 elements

In early February 2005, an accident befell my trusty Galaxie 23. We had a week of extremely high winds that were constant around 70 mph and gusting to over 100mph. The Galaxie 23 stood up to the first couple of days of these high winds and the only issue that I had was that the wind blew the antenna to a different direction. I wasn't overly worried about this and thought no more of it. The winds died down for a few days but they then came back with a vengeance. I was at work on the nightshift when they started to get up. I wasn't worried about the winds as they were not quite as strong as the previous lot and because the antenna had come out unscathed I was confident that the same would be so with these.

So, it was with some shock that I returned home at 6am to find the front three sections of the antenna lying crumpled in my back yard. The driven element and reflector were hanging from the mast still attached by the coaxial cable. Very carefully, I moved the front section to my more secure garden and despite the high winds and rain, I had to climb onto the roof to cut down the rest which duly joined the front section in the garden.

Once the winds had died down I had a look at what happened. The wind had been so strong that it had literally ripped the front three sets of elements from the mast. The aluminium boom sheered off where it entered the bracket and had fallen to the ground, some 30 feet below. With the rear section now unbalanced it was not long before the weight of the antenna also sheered the boom at the point where it entered the bracket. The rear section then fell to the roof which was only 5 feet below.

The rear section of the antenna survived relatively unscathed and would have been usable as a 14 element. The front section had two elements totally written off but the rest was relatively ok. Subsequently, with a bit of swapping and changing, I managed to make a 20 element antenna from what remained.



The 20 element Galaxie is a trade-off in performance from the 23 element. The main difference is in the forward and front-to-back gain which is now a bit less. Additionally, the acceptance angle is wider because of the fewer number of element. In layman's terms it means that I cannot pickup signals from quite as far but I do get signals from wider angle. Overall, I probably pick up the same number of stations.

I now have this back on the mast and it is performing admirably. Notably, Ron Smith never built a 20 element version of this antenna for commercial sale so it's possible that I have the only 20 element Galaxie around?

Mick's Audioworld Website was created and managed by Mick & Dave Evans. © 1998 - 2005
This particular page was last updated 25/03/2005 00:44

On trouve très très peu d'informations sur le net concernant ces antennes Ron Smith !

J'espère que cela va vous aider pour vos recherches.
A+

[bernard lapeyre]

Merci beaucoup pour le tuyau sur les antennes ron smith, mais vu le bébé c'est même pas la peine que j'envisage d'en parler au proprio.
cordialement
bernard

[Jean-Claude]

Merci beaucoup pour le tuyau sur les antennes ron smith, mais vu le bébé c'est même pas la peine que j'envisage d'en parler au proprio.
cordialement
bernard

Bonsoir Bernard,

Tu sembles finalement conserver ton NAT02 , et vendre ton ACCUPHASE (ou Magnum Dynalab: j'ai oublié :jenesaispas )...

A+

[RV]

Bonsoir Jean-Claude,

Il me semblait que Bernard s'intéressait à l'Accuphase T1000 ? Mais je peux me tromper.

à+


Hervé.

[Jean-Claude]

Bonsoir RV,

Non, tu ne te trompes pas....personnellement je conserverai le NAT02, et ne levendrai que pour un NAT01...(qui, par parenthèse, adore les enceintes NAIM.... ).

A+

[filip63]

Et puis, quand la neige aura fondu, quand j'aurais réussi à attraper mon antenniste pour qu'il grimpe sur le toît, je vous dirais ce que donne l'antenne Magnum Dynalab MD-6...

Pour l'instant, je l'ai assemblée et elle attend la fin des intempéries dans le sous sol :?

[RV]

Bah! tu peux la contempler en jouant au billard.

à+

Hervé.