[RFI] 160m-5mhz noise?

Sam Morgan k5oai.sam at gmail.com
Sun Nov 8 11:55:12 PST 2009

Rich wrote:
> If you can hear it on 160  you should be  able to use a portable AM 
> radio with
> the built in loop stick antenna.
this morning I went the other way, down in frequency to 1.700mhz
at 1.700mhz and the frequency's below that are clear

I found the lowest point that the noise starts is 1.705mhz
it starts abruptly and immediately at 1.705mhz
it's not there on 1.700mhz
but is S9+30 at 1.705mhz

here is a clip of one place where I found a cyclic noise on 1.736.74 using LSB

here is a clip of me tuning across the 1.700mhz - 1.705mhz point
I was listening using AM. there is a weak station at the 1st
when I was on 1.700mhz.
I went from 1700 through 1705, then back down to 1700
and then back and forth across the 1705 point it popped up.

by about 1.776 it is starting to sound like my elevated noise floor
goes all the way up to 5.0mhz with S9 to S9+10 on LSB
by 6.0mhz it is gone and I have my normal S3-4-5 noise floor

> Sam Morgan wrote:
>> About 4-5 days ago I started noticing my noise floor on 160m,
>> which had been around 4-5, is now running S9 to S9+10.
>> I did see it stop for a couple of hours on the 2nd day,
>> but now it's steady all day 24/7.
>> This is listening either on a vertical or dipole.
>> It has no distinctive sound, like an arc might have.
>> It just sounds like my atmospheric noise floor
>> had a volume control and has been turned up.
>> I found out to day it goes all the way up to about 5mhz.
>> 5.00mhz is S9
>> 5.25mhz is S8
>> 5.50mhz is S6
>> 6.00mhz is S5
>> 7.00mhz is S4
>> 8.00mhz is S3
>> S3 all the way to 30mhz

GB & 73
Sam Morgan

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