Smart Siren II Upgrade?
Elite HDF Member
Joined: Apr 2005
Posts: 3,542
Likes: 2
From: Oahu, Hawaii
RE: Smart Siren II Upgrade?
I just looked up the parts. Both items together cost $17.30. Chump change compaired to what we spend on our bikes. I'm placing an order tonight.
Once other question. Since I will be mounting this inside of the fairing, does this site offer a AM/FM antenna like the siren one that I can also install inside of the fairing?
Once other question. Since I will be mounting this inside of the fairing, does this site offer a AM/FM antenna like the siren one that I can also install inside of the fairing?
ORIGINAL: coyotedata
Of course it depends on the objects and the buildings in the area but I would guess you will see 3-5 times the range if you do it correctly. All of my buddies that I've done this with (they all had 06 or older bikes) also saw their key fob range double. This mod has nothing to do with the key fob stuff but I'm guessing the parasitic coupling comes into play and the antenna brings those signals up as well. Both are on in the same 433 MHz band. Sorry for the techno speak. I'm a radio engineer by background and design this stuff everyday. The company that designed this module for Harley was nice enough not to make any of their design private when they got their FCC certification. That's the only reason I know so much about how it was designed.
Everyone I've helped do this has had a dramatic increase in range though.
Of course it depends on the objects and the buildings in the area but I would guess you will see 3-5 times the range if you do it correctly. All of my buddies that I've done this with (they all had 06 or older bikes) also saw their key fob range double. This mod has nothing to do with the key fob stuff but I'm guessing the parasitic coupling comes into play and the antenna brings those signals up as well. Both are on in the same 433 MHz band. Sorry for the techno speak. I'm a radio engineer by background and design this stuff everyday. The company that designed this module for Harley was nice enough not to make any of their design private when they got their FCC certification. That's the only reason I know so much about how it was designed.
Everyone I've helped do this has had a dramatic increase in range though.
Cruiser
Joined: Nov 2006
Posts: 236
Likes: 0
From: CA
RE: Smart Siren II Upgrade?
AM FM is a more commercial thing. The same principle applies though. You won't be able to buy an off the shelf product for you're radio BUT. If you only care (mostly) about FM, you can easily make your own fairing antenna out of some 300 ohm twin cable from Radio Shack. The suppliers that sell these FM antennas for Under the Fairing are just doing the same.
Buy some 300 ohm twin cable from Radio Shack. Split it near the end into as long as you can get.. around 3 feet is good. connect one side to the sheild from your radio.. the other to the center conductor. My guess is you'll be OK. It's not perfect for sure.. you'll never get perfect doing a fairing antenna though.
Honestly, I've never worried about it on my bike because I can't stand commercial radio stations.
Either way, this is NOT rocket science... regardless of what they want you to believe. HTH
Buy some 300 ohm twin cable from Radio Shack. Split it near the end into as long as you can get.. around 3 feet is good. connect one side to the sheild from your radio.. the other to the center conductor. My guess is you'll be OK. It's not perfect for sure.. you'll never get perfect doing a fairing antenna though.
Honestly, I've never worried about it on my bike because I can't stand commercial radio stations.
Either way, this is NOT rocket science... regardless of what they want you to believe. HTH
Road Master
Joined: Sep 2005
Posts: 797
Likes: 1
From: Gig Harbor, WA
RE: Smart Siren II Upgrade?
Try this antenna, http://www.ecshylites.com/catalog/it...191/721930.htmworks great in my bike faringand I am still able to receive the weather band.
ORIGINAL: Abnmarine
Once other question. Since I will be mounting this inside of the fairing, does this site offer a AM/FM antenna like the siren one that I can also install inside of the fairing?
Once other question. Since I will be mounting this inside of the fairing, does this site offer a AM/FM antenna like the siren one that I can also install inside of the fairing?
Elite HDF Member
Joined: Apr 2005
Posts: 3,542
Likes: 2
From: Oahu, Hawaii
RE: Smart Siren II Upgrade?
Thanks.
ORIGINAL: SubZer0
Try this antenna, http://www.ecshylites.com/catalog/it...191/721930.htmworks great in my bike faringand I am still able to receive the weather band.
Try this antenna, http://www.ecshylites.com/catalog/it...191/721930.htmworks great in my bike faringand I am still able to receive the weather band.
ORIGINAL: Abnmarine
Once other question. Since I will be mounting this inside of the fairing, does this site offer a AM/FM antenna like the siren one that I can also install inside of the fairing?
Once other question. Since I will be mounting this inside of the fairing, does this site offer a AM/FM antenna like the siren one that I can also install inside of the fairing?
Tourer
Joined: Jun 2009
Posts: 257
Likes: 1
From: Bayarea California
Do you think that Antenna will fit under the seat of a softtail heritage????
The siren module is a 1 watt, 433 MHz transmitter which should have a really good range but does not due to the crappy antenna that is being used. (The antenna portion is the 6” of center conductor with the heat shrink over it).
The problem is two fold. First, the 6” antenna is a quarter wave antenna and requires a ground plane to work properly.
Second, the antenna is placed against the bike frame which detunes it and allows the bike to shadow the signal in some directions.
The solution is to replace the antenna with one that does not require a ground plane and to relocate it away from the bike frame and up as high as possible. I did this using the antenna shown below. Just remove the siren module and cut off the existing wire antenna and crimp the connector shown to the siren coax. If you can’t do the connector crimp you can just solder the center conductor of the siren module to the center conductor of the antenna cable. Also solder the shields to each other. Just keep the exposed center conductor as short as possible. Mount the antenna (using its double faced tape) up into the lid of the tour pack. Route the antenna cable down and connect it to the siren module. You can get the antenna and connector at http://www.digikey.com
The antenna is part number ANT-433-MHW-RPS-S-ND
The connector part number is CONREVSMA011
Let me know if anything wasn’t clear.
The problem is two fold. First, the 6” antenna is a quarter wave antenna and requires a ground plane to work properly.
Second, the antenna is placed against the bike frame which detunes it and allows the bike to shadow the signal in some directions.
The solution is to replace the antenna with one that does not require a ground plane and to relocate it away from the bike frame and up as high as possible. I did this using the antenna shown below. Just remove the siren module and cut off the existing wire antenna and crimp the connector shown to the siren coax. If you can’t do the connector crimp you can just solder the center conductor of the siren module to the center conductor of the antenna cable. Also solder the shields to each other. Just keep the exposed center conductor as short as possible. Mount the antenna (using its double faced tape) up into the lid of the tour pack. Route the antenna cable down and connect it to the siren module. You can get the antenna and connector at http://www.digikey.com
The antenna is part number ANT-433-MHW-RPS-S-ND
The connector part number is CONREVSMA011
Let me know if anything wasn’t clear.
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