[RFI] Medical Equipment interference (RFI)

Steve kt0dx at earthlink.net
Wed Jul 30 03:25:50 EDT 2003

I hope someone out there might be able to point me in the right 
direction to resolving a interference problem that is being generated by 
medical equipment being used at home.

History:  A little over a week ago I started hearing a pulse type tone 
on 20 meters and only 20 meters.  I started out trying to locate the 
source by looking around the house by turning power off to each of the 
rooms except the radio room but the problem was still there.  I then 
went and one by one turned everything off with the exception of the 
radio in the room and nothing found, still had the interference.  Well 
this past weekend I finally was able to get another ham who has HF in 
his van to come over and we went looking.   Well to make a 20 minute 
trip around the area shorter we were able to pin point the source of the 
interference to a home two street's over from my location.  I went up to 
talk to the owner and a women answered the door and I explained what I 
was there for.  Of course she did not appear to understand what I was 
saying except when I described the interference and she indicated that 
about a week ago she took delivery of a device called "Blu-u Light" from 
a company in Ohio.  She said that her daughter was in stage T-3 with 
cancer.  I asked her if she could provide me with the name of the 
company that she had obtained the equipment from but she appeared that 
she did not want to give out anymore information.  I said thank you for 
her time and departed the area.  I have since contacted the major cancer 
hospital in the area in an attempt to obtain some information on the 
equipment but they did not have any information on the equipment and 
recommend I contact the American Cancer Society but this was also a dead 
end.  Two days ago I contacted the Colorado ARRL Director and he is 
going to try and have the local RFI group confirm my findings and make 
an attempt to find out who the company is that is providing the equipment.
I hope this will work out but anyone have any idea if they fail in 
obtaining the information where to go next?
This interference is being heard as high as 15MHZ and as low as 13MHZ 
and is strongest at 14.317.00  (60db over with 18db of attenuation using 
a FT 1000MP).  Another station 2 miles away is receiving the signal on 
the same frequency as S-7.  Maybe there is someone in the medical field 
reading this might know something about this device.  I'm sure if I can 
get to the manfacture they would resolve the problem as I'm sure there 
is a problem with the equipment with the interference I have and is this 
device really providing the level of care that is required. 
Anyone know how the FCC might react to this type of problem? (I almost 
suspect that the signal is not a harmonic with it being so strong 2 
miles away and suspect that what ever is causing the transmissions is 
sending the signal right on 14.317.00)

Thanks for reading this

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