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Radar knocks out Sirius radio?

Old 07-23-2004, 10:27 AM
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Default Radar knocks out Sirius radio?

Clarion Sirius/work fine without the radar on. Radio still works, cd etc WITH the radar on, but the satellite sirius loses reception. Obviously the radar is interfering with the Sirius reception, do I need to move the antenna for the radio?
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Old 07-23-2004, 11:22 AM
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Default RE: Radar knocks out Sirius radio?

yes. same as for gps antennas. dont put them in the beam path.
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Old 07-23-2004, 11:47 AM
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Default RE: Radar knocks out Sirius radio?

Sea_dad...it seems to be a lot lower than the dome which is why I'm surprised it's getting knocked offline...the dome is up on a stand above the t-top, the satellite is just flush with the t-top. I may move it and mount it forward on the railing.

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Old 07-23-2004, 01:50 PM
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Default RE: Radar knocks out Sirius radio?

scott-hydra24 - 7/23/2004 10:47 AM

Sea_dad...it seems to be a lot lower than the dome which is why I'm surprised it's getting knocked offline...the dome is up on a stand above the t-top, the satellite is just flush with the t-top. I may move it and mount it forward on the railing.

Does the antenna wire run the same route as the radar cable? I have the same problem and I believe that is the reason. I am using the automotive antenna and it is mounted beneath the T-top canvas. Reception is fine except when the radar is on. It doesn't get knocked offline - the reception just gets very poor. If you can pull the wires easily try rerouting them.

Ed
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Old 07-23-2004, 02:45 PM
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Default RE: Radar knocks out Sirius radio?

If it's not getting hit from the beam, then check your power connections. Wire them separately.
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Old 07-23-2004, 04:35 PM
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Default RE: Radar knocks out Sirius radio?

Man, I wish I could knock out the hole Sirrius network alltogether!!
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Old 07-23-2004, 05:06 PM
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Default RE: Radar knocks out Sirius radio?

Birdman ....... really ........ to each his own ...... Cheers ........
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Old 07-23-2004, 05:43 PM
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Default RE: Radar knocks out Sirius radio?

Sea_Dad,

Sea_Dad - yes. same as for gps antennas. dont put them in the beam path.
I keep seeing that posted by you and a few others, but have never had a problem on any of the 3 boats I've owned that had radar and GPS, plus my dad's boat, and a friend's that I set up. On all of them, the Raystar 120 (or similarly shaped antenna with Raynav 300) is flushmounted to the hardtop, as is the radome...never had any problems. All are about 5-6 feet away, so they are clearly in the beam path. The manual says "for best performance" keep it 7 feet and out of the path, but my GPS is balls on.

Harry
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Old 07-23-2004, 09:34 PM
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Default RE: Radar knocks out Sirius radio?

Well to be honest, I never had any interference from the radar with my ray120. However my lowrance antenna would lose WAAS when I would turn on the radar. It would pick it right back up as soon as I shut the radar off.

My solution was to change antenna mounts so my gps antenna was a couple of inches lower than where the original mount placed it. Which put it about 5 inches below the lower lip of the radar antenna at a foot away from it. It never hiccups at all when I turn on the radar now.

GPS signals are close enough in frequency to radar signals that it can overdive the pre-amp. The preamp is expecting signal levels in the microvolt range and the radar signal at a foot away is in the volts level. Millions of times larger than the pre-amp was designed for. In extreme cases say hitting one with 12KW could easily cook the pre-amp in the gps antenna. It is a hit or miss type of thing, it might do it, it might not. But obviously it interferes in enough cases to warrant their warning you that it could.
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Old 07-23-2004, 09:38 PM
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Default RE: Radar knocks out Sirius radio?

I understand the engineering aspects of it, but in practice, I have not seen anyone actually have problems...you are the first person I've seen that has actually had a problem.

Harry
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Old 07-24-2004, 01:09 AM
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Default RE: Radar knocks out Sirius radio?

man I hate to think of myself as an enigma you know.

theres an old saying that I'll recite yet again. Just because you are unaware of something, doesnt mean it isnt so. It just means you're unaware of it.

Dont get caught up in a database of a few samples. When they warn of things in a manual, and they build thousands. well...
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Old 07-24-2004, 01:19 AM
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Default RE: Radar knocks out Sirius radio?

Or more likely, it is an isolated case that potentially costs them big in a lawsuit, so they provide a warning to protect themselves.

Harry
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Old 07-24-2004, 01:26 AM
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Default RE: Radar knocks out Sirius radio?

hmmm well since it happened to me, it has to have happened to thousands.

I simply base my call on the fact that the frequencies are close enough to cause interference. Without ample filtering in the preamp stage it all passes thru. So quite it's possible the ray120 has better discrimination. I dont know as I havent seen a schematic for either or others. But being a EE, I do trust warnings from my colleagues.
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Old 07-24-2004, 01:50 AM
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Default RE: Radar knocks out Sirius radio?

EE, huh? That explains a lot I'm an AE by education...did only a few EE courses. As for the GPS/radar thing, like I said, just curious.

Harry
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Old 07-24-2004, 07:33 AM
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Default RE: Radar knocks out Sirius radio?

Anything with an E on the end is a good field

Ive been doing EE design for 24 years now. Most of it on the bleeding edge, where the development far out paces the technology. I have a bald spot from it.
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Old 07-26-2004, 12:38 PM
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Default RE: Radar knocks out Sirius radio?

We tried the Sirius radio for the first time w/ the new radar this past weekend, and the radar was constantly knocking the sirius reception off. We could only run it when the radar was off...Will look at moving the antenna farther back and away from the radar. We are running the Furuno 12kw w/ the Sirius radio.
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Old 07-26-2004, 01:55 PM
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Default RE: Radar knocks out Sirius radio?

Sounds to me like everything is working just fine!! Leave the radar on, and you won't have to listen to and pay for radio!!
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Old 07-26-2004, 03:19 PM
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Default RE: Radar knocks out Sirius radio?

clinecs, you need to raise it above the radars antenna or lower it below considerably. moviing it away may only bring you more into the beam path, as the beam pattern increases in size both horizontally and vertically as the distance grows from the antenna.
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Old 07-26-2004, 04:33 PM
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Default RE: Radar knocks out Sirius radio?

Sea Dad, the Sirrus antenna is flush on the hardtop and the radar sits well above it. The GPS antenna is very close to the Sirrus antenna and is not effected by the radar??? I'm confused!

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Old 07-26-2004, 05:00 PM
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Default RE: Radar knocks out Sirius radio?

are you and clinecs talking about the same boat here? I feel like I am in a WWF tag team match

The furuno says it transmits at 9.410Ghz +/-30Mhz, Sirrus says it receives at 2.345Ghz. Thats very close to being an even multiple (harmonic). Because the radar transmits pulsed it also transmits harmonics of its carrier frequency as well as harmonics of the pulse frequency. It could be the 4th sub harmonic has enough energy in it to swamp the sirrus antenna.

I would try moving the sirrus closer to the radars antenna just in case the antenna has a wierd vertical sidelobe that paints the top of the T-Top. I would expect the sirrus to work with it's antenna stuffed in the console as well, so theres another place you could try. The T-Top wont present any restriction to it's signal nor the gps's.

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