Webasto T70/T90 Range

Hi!
I'm finally trying to install my FFB for my portable heater. Currently, I'm just testing it in various locations to get an idea of the range. So far, I'm pretty disappointed. The vehicle is parked in a normal residential area with single-family homes, and I'm only managing to reach about 75m in a straight line (and I was even using the transmitter outdoors!). That's quite short, especially considering the advertised range of 600m in an open field. What could be the problem? I've tried placing the antenna in all sorts of locations... but nothing seems to make a difference. The battery voltage of the transmitter is 11.8V when idle, and about 10V when transmitting. But is that really such a big difference? What ranges are you getting?

Dirk

Hello Dirk,

Unfortunately, I don't have any practical experience with the Webasto FFB.

But the specified radio range is twice as long as that of standard DECT phones (300m), at 600m. In reality, most radio phones fail at around 30m. Therefore, you are already achieving more than double the stated range with 75m. It is unlikely that it will increase much further. The stated 600m applies under optimal conditions, i.e. in good weather and with a clear line of sight between the transmitting and receiving antennas, without any glass, metal, or obstructions in between. Probably even without reflections from nearby houses, hills, etc. Therefore, they are not achievable in reality.

What you can do to increase range, if the receiver's design allows: Place the antenna as straight as possible and as "externally" as possible, i.e. without any shielding plates around it. Either use a truly external antenna (Optics? No thanks), or place it in the upper area of the vehicle, where there is less metal, such as the engine block, to shield the radio waves. (e.g., on the upper part of the windshield, horizontally?). Then touch the transmitter in such a way that you don't shield the transmitting antenna with your hands. But I don't expect to double the range with these measures. And does it even make a difference?

My suggestion: install an old mobile phone with a prepaid SIM card in the vehicle, utilize the vibration alarm, and use a timer to activate the STH (presumably a stolen vehicle recovery system). This works perfectly over hundreds of kilometers. Just make sure no one reveals the STH mobile phone number If the SIM card could be recharged, it would be perfect. However, some mobile phone contracts offer free partner SIM cards with their own phone numbers That's how I do it. So far, I only get about one call every two years, and the person dials the number (I can see it in the call log). Then the STH goes off once every two years, and I'm okay with that.

Greetings,
Guste

Hi, I can only agree with Guste, it works perfectly for me too.

I used an old Siemens S10, which allows you to activate a filter that only allows calls from phone numbers stored on your phone to be answered.

This way, no one can accidentally activate your STH.

http://www.skyynet.de/remote.php

http://www.bmw-syndikat.de/bmw-syndikat/archiv/fernbedienung/

http://www.sgaf.de/viewtopic.php?t=26680&highlight=handysteuerung

I used this circuit board as a starting point and simply soldered an LED to the "bell" of the phone.

It's just great when you're rummaging around in the H&M stores, knowing that the end of your shopping trip is in sight, and the car is already warming up in the parking lot 4km away :-)

Instead of the summer/winter switch, I installed a thermostat, so it automatically switches between summer and winter operation.

If the temperature inside the vehicle is above 25°C, it only ventilates; if it's colder than 25°C, it heats up....

Greetings

Sven

I have a T91 and I am very satisfied with its range.
I haven't yet conducted the test to see how far I can go.
However, I have already achieved a few hundred meters within the city.
The antenna is horizontally attached to the lower left edge of the windshield.

I've built a mobile phone control with DTMF decoding.
It works quite well.
It's built using a C-Control, a DTMF decoder module, and an old Nokia 2210.
You should still be able to program some basic code.

Best regards, Maxx

If the T91 battery is weak, the following steps can be used to reconnect it to the heater:

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