Are batteries on both devices new/full? If the sensor's battery is low it might not have the power to transmit to the front of the bike.

You might be able to find a location that has a minimum amount of interfering stuff in between. Maybe computer on the outside of the handlebars so it has a good line of sight to the sensor?

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STAC Zero Trainer - Zero noise, zero tire contact, zero moving parts. Suffer in Silence starting fall 2016

batteries new and tried everything
it is not a line of sight issue.

the range is just not enough.
not sure if this is designed into computers
to prevent 2 of them from causing issues to one another
if they happened to be near each other while out on a ride.

^This, however most computers will work if mounted on the top tube. Range is usually 22-26 inches, fresh batteries do help as does syncing the computer by holding the head close to the sensor then moving as far away along the top tube as it will hold signal. I usually use velcro dots to hold it to the top tube, another option told to me by a customer is to use a loop of blue painters tape, holds well and removes clean.

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Jim

**Note above poster works for a retailer selling bikes and related gear*

When I used a Cateye wireless cpu was designed for the RW pickup but if I put it out on my aerobars in front of my bottle it was very spotty, if I had it on my stem it was fine, never an issue. Also If I used my old Polar HRM it interfered with it, but my old Timex HRM did not.

I have since switched over to ANT+ RW pickup devices CPU, no issues. Also when on the trainer, I have a small USB ANT+ dongle on my PC that is another 12" or so in front of my aerobars and picks up up the RW sensors without issue.

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<We all know that light travels faster than sound. That's why certain people appear bright until you hear them speak>

You could run a garmin and run the speed/ cadence sensor. I use perfpro software with a kurt kinetic trainer and it links directly with the software.

i don't want to use any secondary computer or software or cabling .
i just want to leave my wireless computer on the stem ...where it was.. when i had my spoke sensor mounted on front wheel.
but i want to leave the spoke sensor and pick up on the rear now.
that way i don't have to remount it back to the forks anymore .
when i put the front wheel on.
i just want to leave it hooked up to the rear full time and have it work .

Why on earth would you care about mileage on an indoor trainer? It is never accurate or equivalent to actual outdoor mileage. The metrics used for indoor trainers are Intensity x Duration. This can be done using Power or Heart Rate over a set period of time. Distance is just not useful in this environment and is just plain inaccurate 99.99999% of the time. You're looking to a solution to a flawed process.

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"Train so you have no regrets @ the finish line"

 
lets stay on topic.
i am only focused on the mileage
not heart rate or power or anything else.
i just want a wireless computer
with enough range so that it functions when mounted on the rear

Cateye Strada Wireless

Before I went the power/Garmin route, I loved them.

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Twitter @achtervolger

The mileage isn't REAL mileage so why would you track it, it's useless data. Apparently I digress however good luck with your search.

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"Train so you have no regrets @ the finish line"

One option is to get a Bluetooth speed/cadence sensor for the rear wheel (ex. Whaoo), and use your phone as the head unit during indoor rides.

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ECMGN Therapy Silicon Valley:
Depression, Neurocognitive problems, Dementias (Testing and Evaluation), Trauma and PTSD, Traumatic Brain Injury (TBI)

I have a Sigma wireless computer that works fine with the magnet on the rear wheel and the head unit on the head stem.

I have a Sigma as well, and need to move the head unit about 3in behind the stem to get a signal, so I have to keep the sensor on the fork (I have a size S Shiv). For some reason the cadence sensor works fine from back by the rear wheel, but the speed sensor lacks just a bit of range.

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ECMGN Therapy Silicon Valley:
Depression, Neurocognitive problems, Dementias (Testing and Evaluation), Trauma and PTSD, Traumatic Brain Injury (TBI)

not a fan of taping wires .
not looking for a phone related solution.
just a basic handlebar mounted wireless computer that has enough range
so that when the sensor is mounted at rear wheel
it functions

I have Bontrager Node. I also ride Trek so the sensor is integrated in the frame....but that does all go on the back wheel.

Get the Node1.1, then find a Garmin GSC-10 speed/cadence sensor and your good to go.

Later, if you ever see the light, you can easily switch to virtual power training while using the trainer by obtaining a ANT+ dongle and a PC.

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<We all know that light travels faster than sound. That's why certain people appear bright until you hear them speak>

I have the Node 1.1 on my road bike, works fine with the Bontrager speed/cadence sensor at the rear. Both of my Garmin watches have held strong with either the speed/cadence sensor on my road bike, or Garmin's magnet-less sensors on my TT bike (speed on the rear hub). I'm fairly tall, so the watches on my wrist are a pretty good distance away from the sensors.

For what it's worth, both my old Garmin ANT+ mini dongle, and the new Sunnuto dongle didn't have any issues picking up the rear sensor with my computer in front of the bike.

Cateye Double Wireless

Does exactly what you want, doesn't have anything extra. Basic and it works.

I also use a Sigma set up on the rear wheel, both cadence and speed. My computer is mounted up mid way on my areobars and I have no reception issues.