[OFARC] Jamming Cuba??

[Stephen Flowers]

Gents,

I also noticed that the cuban jamming signals vary in intensity as a 
function of time.  The signal originators may be trying to "drown out" 
the transmitting station on the island.  Fascinating.

We'll have a video on this topic in our meeting in two days!

73,

Stephen (W2WF)

On 7/22/2021 12:41 PM, ralph phillips wrote:
> Agreed.  I was seeing 3 types of signal trace on 40m at different times.
> One was broad continuous hash covering about half the band. Next came 
> short bursts of about 2 seconds covering the whole band.  Bursts were 
> separated by 5 seconds.  The most recent is distinct very narrow 
> strong signals.  5 or 6 stripes on my waterfall display separated by 
> several kHz.
>
> This morning both 20m and 40m are washed out by noise.  Someone must 
> have bad fluorescent lights.
>
> Get Outlook for Android <https://aka.ms/ghei36>
>
> ------------------------------------------------------------------------
> *From:* MLandress <gammamann at aol.com>
> *Sent:* Thursday, July 22, 2021 11:50:48 AM
> *To:* 'Stephen Flowers' <ursae47 at gmail.com>; 'ralph phillips' 
> <ke5hdf at sbcglobal.net>
> *Cc:* 'OFARC' <ofarc at mailman.qth.net>
> *Subject:* RE: [OFARC] Jamming Cuba??
>
> I’ve looked at the signals from this station and re-ran the time of 
> arrival plots several times.  The signals look like data transmissions 
> rather than jamming.  The time difference of arrival for these signals 
> plots all over the place but it appears to be from Caribbean on 
> several of the runs but also plots in Mexico and central America. 
>  Simple enough to send or receive a burst coded message that can 
> defeat “jamming” across the spectrum.   A healthy dose of skepticism 
> is always good with this stuff.
>
> *From:*ofarc-bounces at mailman.qth.net 
> [mailto:ofarc-bounces at mailman.qth.net] *On Behalf Of *Stephen Flowers
> *Sent:* Monday, July 19, 2021 10:47 AM
> *To:* ralph phillips
> *Cc:* OFARC
> *Subject:* Re: [OFARC] Jamming Cuba??
>
> Hey Ralph,
>
> This video from KI6NAZ's YouTube channel shows how to use 
> triangulation of KiwiSDR stations around the americas to deduce that 
> the location of the jamming signal.  Spoiler alert: it's originating 
> near "Western Cuba".  I thought that it was pretty cool use of 
> existing Ham radio tech!
>
> https://youtu.be/dtICIDDvnPw <https://youtu.be/dtICIDDvnPw>
>
> They're affectionately calling the jammer "The Cuban Rum Runner" ( lol 
> ) and he's been with us since at least July 15th.  Hope that you find 
> it interesting!
>
> 73,
>
> Stephen (W2WF)
>
> On 7/19/2021 10:26 AM, ralph phillips wrote:
>
>     Network News reports that internet service in Cuba has been shut
>     down by the government.  Hal called and said he has heard reports
>     about the Cuban government jamming amateur radio signals.
>
>     Normally I see several FT8 signals from Cuba each day, but the
>     past few days none. Last night I noticed a wide band of unusual
>     interference on 40m. It extended from 7.05 to 7.2  with white
>     noise punctuated by clicks.
>
>     Steven says he has seen the same thing for 2 days.
>
>     I suggest we monitor HF bands for unusual interference and report
>     anything unusual to ARRL.
>
>     Since we are in Houston Texas it is a short hop to Cuba.
>
>     Ralph
>
>     KE5HDF
>
>
>
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> -- 
> 73,
>   
> Stephen (W2WF)

-- 
73,

Stephen (W2WF)

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