[RFI] OTHR ?

[Grant Saviers]

Various pulse trains come and go on 80m.  One has a PRF of exactly 50Hz, 
almost certainly OTHR.  Another seems to have a lower rate, maybe 120Hz, 
I haven't measured it exactly.  Today I had a multi tone (9x?) in about 
200Hz garbaging up most of the FT8 segment with the primary and several 
bad image IMDs.  Also the lower PRF in the bottom of the FT8 segment. 
All probably from Asia somewhere.  FT8 seems to deal ok with the OTHR. 
It kills SSB in my experience.  The multi tone transmission is a bigger 
problem.  All come and go with prop, so they are not local RFI on my 
Flex6700.

Grant KZ1W

On 12/10/2018 4:01 AM, Tom Lizak wrote:
> Hey guys,
> 
>   
> 
> This probably is not the place for this but for the past three days, there
> has been some kind of OTHR/pulse on the 75m band.  Seems to be pretty loud
> at times and must shift around the band as it will disappear but only to
> reappear.  I heard it 09Dec almost all morning up to around 17Z...then later
> in the afternoon reappeared !
> 
>   
> 
> It came back again  this AM and seemed to have been peaking around 3.900MHz
> or so.  The ME stations were hearing it also along with many others in the
> New England area.  Seems to be narrowing in the 75m sector of the band.
> 
>   
> 
> Does anyone have any idea what it is and where it may be coming from ?
> 
>   
> 
> 73
> 
> Tom/K1TL...
> 
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