Seeking Advice on ELK M1XRFTW Range Enhancement

Hello Cocooners!
 
I have a new backfit ELK M1 installation with the M1XRFTW wireless accessory.  I am using ELK 6010 keyfobs but experiencing spotty RFconnectivity and short range (less that 50 feet) in and around the house.  The M1XRFTW is wall mounted in the clear on an interior second floor wall at one end of the house.  The connectivity/range issues are (not surprisingly) at the opposite end of the house and also outdoors at about a 50-75 foot range.  I am a ham radio operator and electrical engineer with modest understanding of the constraints of RF propagation in the 900 MHZ band.
 
I would appreciate any practical suggestions on boosting the range beyond the obvious relocation of the M1XRFTW unit to a more central location inside the house (which I intend to trial).
 
Thanks in advace for any advice.
 
Bill

Another option is to add another XRFTW.

I have learned recently that the m1xrftw uses the 902 - 908 mhz band that is used by many telephones and baby monitors and other household items. Have you considered looking for devices in the house that may be interfering with the keyfob?
 
I have had similar problems with the keyfob and at ranges as short as 30 - 40 ft and the device is tested for larger ranges than that. I'm thinking that I have something interfering with it but haven't spent any time loking for the problem yet.
 
It will be interesting to see what replies you get here.
 
Mike.

Quote from the m1xrftw installation manual
 
FCC AND IC COMPLIANCE STATEMENT:
This device complies with Part 15 of the FCC Rules and Industry Canada License-Exempt RSS Standards.  Operation is subject
to the following two conditions: (1) This device may not cause harmful interference, and (2) This device must accept any interference
received, including interference that may cause undesired operation.
 
take note of requirement #2.
This device must accept any interference received, including interference that may cause undesired operation.
 
Mike.

Might be construction details of the house itself combined with a bad RF receiver location.
 
Also, pay attention to the proximity to the control and/or any cellular or communications hardware. Have you looked at the ham equipment and is that overpowering the fobs?
 
I had a house a few years back that was in proximity to some 50KW radio transmission towers, and while the frequencies were different, the spectrum overpowered the RF devices installed by another company (takeover) and were always an issue until the house was hardwired for the protective devices. If I remember, even the stereo speakers in the house moved a little with the RF energy (tumor anyone?)