Topband: Echo on 160m yesterday morning

[Brian Pease]

I experienced long delayed CW echos once on 20m, back in the 1980s 
before there was much wireless stuff.  Also, I lived in the country with 
no close neighbors.  The delay was significant because I was not using 
instant break-in, with the rig taking at least 1/4 sec to switch to 
receive.  I think it might have been longer than the delay of an around 
the world path.  Besides, I think I was using my 2 Watt QRP rig.

On 2/6/2017 12:23 PM, JC wrote:
> Nowadays we have a huge amount of RF repeaters in use for several services,
> like , Wi-Fi , LTE4, Data links. Microwave links, FM stations link, TV video
> links.
>
> All these systems has a receiver and a transmitter. The intermediated
> frequency used can be close to few MHz depending the services. Like video.
> Our HF signal can become data in these system,. A lot of this system does
> not have the quality necessary, price is always a sales point, so poor
> shield is very common.
>
>   SDR technology that provide long delays, and  with very bad IP3 front end
> are very common used on these system.
>
> The long cables with not appropriate ground can become efficient antennas
> for low bands, the common mode noise can get into the IF system and on the
> receiver side and retransmitted on the transmitter side.
>
> My point is that atmospheric plasma loops may not be the only answer for
> 250ms echo's. It is most unlike due the small power used during the event
> observed. Manmade echo are more likely to explain the echo.
>
> 73's
> JC
> N4IS
>
>
>
>   repeaters, ----Original Message-----
> From: Topband [mailto:topband-bounces at contesting.com] On Behalf Of Tim
> Shoppa
> Sent: Sunday, February 05, 2017 4:44 PM
> To: on7eh <on7eh at skynet.be>
> Cc: topBand List <topband at contesting.com>
> Subject: Re: Topband: Echo on 160m yesterday morning
>
> I have heard echoes of my own signal under some circumstances too. More
> often on 80M but a couple times on 160M. Often in the hour before dawn.
>
> These echoes were also heard on other stations within a few hundred miles,
> especially ones to my north.
>
> For the 160M echoes, some stations in W1 were nearly uncopyable on my
> receive antenna (K9AY) because of the echo. The echo was very similar to a
> dit length and very similar in strength.
>
> Interestingly enough, if I went to listen on my transmit antenna (Vertical),
> the echo completely went away.
>
> Tim N3QE
>
> On Sun, Feb 5, 2017 at 4:32 AM, on7eh <on7eh at skynet.be> wrote:
>
>> For the first time,
>> I heard my echoes on topband, yesterday morning starting around 05 UTC.
>> They lasted for at least 1 hour, with some OFF-periods in between.
>> I had to quit at 06 UTC. (still 1 hour before surise)
>>
>> The echoes were loudest on the short Beverages (<60m long) heading N/S
>> and NE/SW and several dB lower on the NW/SE Beverage. (about 130m long).
>> The Tx setup is modest with Elecraft K3/100 and inv L at 15m height,
>> sloping down to 11m.
>>
>> Only DX heard that morning was USA (typical condictions) so I wonder
>> what else does hearing echoes indicate?
>>
>>
>> 73,
>> Michel, ON7EH
>>
>>
>>
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