V1 Antenna Question

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08-22-2005, 03:26 PM
fred france

V1 Antenna Question

Hi to All

Did some had already think about a king of antenna like the radio FM antenna reception that we stick on the glass, with a small cable going to the autradio ?
May this can be also possible for the Valentine 1 ?
3 good points on that:
1) we can stick the antenna on the glass everywhere we like
2) we can put the V1 thenfore everywhere in our car easily
3) nobody can imagine that there is a RD on the car
4) would be very estetical

May be stupid or technicaly not possible but could be VERY conveniant for many guys ....

best regards

Fred
V1 3.825 Euro Mode
08-22-2005, 03:36 PM
brick

It's definitely not stupid but I don't know how feasible that really is. Our radar detectors use a horn antenna because it offers the greatest gain for such a small case. It also allows them to be directional, reducing annoying false alarms from the side.

One option might be to use patch antennas but you would need to have an array of them on the vehicle since they have to be tuned to a particular frequency. I'm not sure if that would offer any advantage over the standard horn behind the bumper as with most remote detectors.
08-22-2005, 03:48 PM
Hessen

Professor Jim will Know...... :)

Calling Professor Jim.....

Congratulations on the V1 Fred...... :wink:
08-22-2005, 04:45 PM
SmaartAasSaabr

You mean like the wire sandwiched between the glass like on old GM cars? Judging from my FM reception maybe not :lol:

Radar is typically much higher frequencies (10.5GHz, 24.15GHZ, 34.3GHz) than FM radio (88.5GHz, 101.9GHz, etc) which is higher than AM (540kHz, 1410kHz), so the antenna design might not be applicable.
08-22-2005, 04:47 PM
jimbonzzz

Not feasible, for the reasons that Brick mentioned. :D
You could detect radar this way but the antenna would be little more than a feedline so forget about any prior warning, it would need to be at point-blank range. For any performance on these bands there's only a few options: horn, lens, or parabolid dish antennas.

Jim
08-22-2005, 04:50 PM
SmaartAasSaabr

Hmmm....

I wonder if I got an old ExpressVu dish, 51cm diameter, supposed to run on Ku anyway could get some major RD reception? What if I got one of the massive 120cm dishes like they use in the Arctic?
08-22-2005, 05:02 PM
jimbonzzz

Quote:

Originally Posted by SmaartAasSaabr

Hmmm....

I wonder if I got an old ExpressVu dish, 51cm diameter, supposed to run on Ku anyway could get some major RD reception? What if I got one of the massive 120cm dishes like they use in the Arctic?

Hell yeah! MAJOR gain there. :lol:
08-22-2005, 05:20 PM
SmaartAasSaabr

How do I connect it? I got some RG-6 coax cable coming out the dish and an RD...

UNLESS - I just put the RD in the area where the "sensor" is, would the parabolic dish give me a gain? In a scrapyard I go to there was a pickup with half a dozen DirecTV dishes missing the reciever, maybe some business for Salzco Microwave Engineering
08-22-2005, 06:38 PM
f_399

also ripping your V1 apart would void any possible upgrade
08-22-2005, 06:53 PM
jimbonzzz

Just mount the V1 at the focal point of the dish :)
08-22-2005, 07:37 PM
SmaartAasSaabr

Quote:

Originally Posted by jimbonzzz

Just mount the V1 at the focal point of the dish :)

That is my idea... But how to properly mount that, if I just welded to the roof it would be unaerodynamic...

Inside? Has the bonus of allowing you into carpool lanes...
08-22-2005, 07:42 PM
jimbonzzz

Quote:

Originally Posted by SmaartAasSaabr

Quote:

Originally Posted by jimbonzzz

Just mount the V1 at the focal point of the dish :)

That is my idea... But how to properly mount that, if I just welded to the roof it would be unaerodynamic...

Inside? Has the bonus of allowing you into carpool lanes...

:lol:
08-22-2005, 09:39 PM
SmaartAasSaabr

Get a permanent marker do some eyes and some lipstick...
08-22-2005, 09:44 PM
trazadone

Quote:

Originally Posted by SmaartAasSaabr

That is my idea... But how to properly mount that, if I just welded to the roof it would be unaerodynamic...

Inside? Has the bonus of allowing you into carpool lanes...

I'm still trying to envision how you would suddenly pull the dish apart and stick it under your seat when the cop pulls you over. Or better yet, stick it in your pocket when the cop wants to search your car. :lol:
08-23-2005, 06:56 AM
kpatz

Quote:

Originally Posted by trazadone

I'm still trying to envision how you would suddenly pull the dish apart and stick it under your seat when the cop pulls you over. Or better yet, stick it in your pocket when the cop wants to search your car. :lol:

Well that's the thing. The cop won't know it's a RD. If he asks, just tell him it's a new high performance mobile satellite receiver dish. Or just leave the "DirecTV" logo on it. DirecTV doesn't make RDs so to the cop it isn't illegal, is it? ;)
08-23-2005, 02:30 PM
fred france

thanks Horn, just test yesterday the V1 against radar fix cabin, working in great way.... now need more practice ....

I have read carefully all the comments and thanks for that, indeed the idea was to connect a kind of antenna to the V1 like radio FM antenna sticked on the glass but 98 Mhz is not 10 Ghz or 24 Ghz that is sure.

Would have been good to have such one as we could place the V1 Antenna and the V1 RD anywhere it is convieniante for each user

thanks to all

fred
08-23-2005, 06:13 PM
SmaartAasSaabr

Quote:

Originally Posted by kpatz

Quote:

Originally Posted by trazadone

I'm still trying to envision how you would suddenly pull the dish apart and stick it under your seat when the cop pulls you over. Or better yet, stick it in your pocket when the cop wants to search your car. :lol:

Well that's the thing. The cop won't know it's a RD. If he asks, just tell him it's a new high performance mobile satellite receiver dish. Or just leave the "DirecTV" logo on it. DirecTV doesn't make RDs so to the cop it isn't illegal, is it? ;)

DirecTV is illegal in Canada :roll:
08-23-2005, 06:20 PM
kpatz

Quote:

Originally Posted by SmaartAasSaabr

Quote:

Originally Posted by kpatz

Quote:

Originally Posted by trazadone

I'm still trying to envision how you would suddenly pull the dish apart and stick it under your seat when the cop pulls you over. Or better yet, stick it in your pocket when the cop wants to search your car. :lol:

Well that's the thing. The cop won't know it's a RD. If he asks, just tell him it's a new high performance mobile satellite receiver dish. Or just leave the "DirecTV" logo on it. DirecTV doesn't make RDs so to the cop it isn't illegal, is it? ;)

DirecTV is illegal in Canada :roll:

That would make for an interesting ticket... illegal DirecTV dish housing an illegal radar detector, and having a sat. dish on the car is probably illegal too. I guess being an American is not so bad after all. ;)
09-05-2005, 09:41 PM
fred france

Well I was looking to the internal V1 (thanks BiGeAsYgUy for this).
My question is then simple (always keeping in mind the way to have the RD more discret as possible):
is there any possibility to move/remove the horn from the V1 (on photo it seems that it is possible) and connect it from any where in the car thanks to cable to the main unit thenfore without is front horn

Thanks
09-05-2005, 09:45 PM
jimbonzzz

No, it cannot be done because the circuit is on the board and the cast horn only covers the circuit. The best way to do what you want is to mount the whole unit remotely and then use the remote display.

Jim
09-08-2005, 11:39 PM
erobinson

Quote:

Originally Posted by jimbonzzz

No, it cannot be done because the circuit is on the board and the cast horn only covers the circuit. The best way to do what you want is to mount the whole unit remotely and then use the remote display.

Jim

It seems that an E.E. or other technician with some experience could remove that circuit from the board, or rebuild it on a new PCB and run something like an RJ45 or RJ11 cable to the remotely located V1 main board.

As for your idea about a parabolic dish or other large horn, I'm not sure if that would work. I've done some reading with regards to horn design for sound, and they have very specialized formulas for determining mouth opening, horn shape, etc. based on the frequency you want to reinforce, etc. So, I'm not sure if just any old "horn" would do anything other than make it directional.

Btw, I think the V1 uses a tractix design.
09-09-2005, 12:15 AM
jimbonzzz

Inside the V1, there is a main processor board that is separated from a receiver board with a molex type of connector. Although you could separate those two, resulting in the processor board becoming a very crude remote display of sorts, separating any portion of the receiver board from the rest of it would prove to be too difficult to be practical.

The V1 uses microstrip technology on the receiver board to transmit the signal from one section of the circuit to the next without any loss. The size and spacing of the traces on the board actually compose part of the circuit. The mechanical design of the receiver section is just as important as the components used. There's no practical way to separate a significant part of this board off of another part.

I still say the best way to accomplish the goal would be to mount the whole unit remotely and use the remote display.

Jim

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