[ARC5] Strange signal on ~3595 kHz

[Tim]

Hi Ken,  Interesting...Just looking at propagation. Irrespective of the
call sign formats heard, at 0700 local time in Idaho the signal could be
following the great circle Gray Line route in from the northeast.  The line
follows the short path near the pole from central Europe and east Africa.
If the call signs somehow indicate Chinese gov, perhaps the big new Chinese
naval base in Djibouti or their other "holdings" in Mombassa/east Africa?

If the signal had some auroral flutter it would most likely indicate it was
coming in via that Gray line path.

A bit later in the morning the great circle short path passes right through
east Asia/China..(is the signal getting stronger or weaker at 0700 local?)

I had access to a PRD-1 but it is gone now...From a clear location, their
null bearings were reasonably useful on skywave signals arriving from low
angles.  You could tell which main path it was taking anyway..

Tim
N6CC



On Fri, Jan 4, 2019 at 11:12 AM Dennis Monticelli <
dennis.monticelli at gmail.com> wrote:

> Small loops have sharp nulls on ground waves.  Skywaves give broad weak
> nulls, though still useful.  Another hint is simply propagation.  What
> paths were coming through well at the time?  From the SF bay area eastern
> China is best pre-dawn.
>
> Dennis AE6C
>
> On Fri, Jan 4, 2019 at 10:51 AM howard holden <holden7471 at msn.com> wrote:
>
>> The July 1980 QST has an article on simple loop direction finders, both
>> open wound and ferrite bar. Back in the 80s I built one for 75M using a
>> ferrite rod with coil and cap for tuning,  and a sense antenna to give
>> the received signal a cardioid pattern, when a numbers CW station often
>> came on an early morning net I participated in. I and another fellow
>> determined by triangulation that the station was in Cuba, thus ending
>> our pursuit. Was pretty simple, but as long as the signal you're hunting
>> can be heard, crude location can be determined.
>>
>>
>> Howie WB2AWQ
>>
>> On 1/4/2019 10:32 AM, Richard Knoppow wrote:
>> > Any sort of loop will work, the Adcock is really a sort of loop. Since
>> > great precision is not needed a small loop would do. Its a matter of
>> > getting readings from a number of separated stations and plotting
>> > them. I would give at least an approximate location. At higher
>> > frequencies a beam antenna could be used but at 4 Mhz a beam is too
>> > large but a loop is quite practical.
>> >    If a fairly large number of stations hear the signal plotting
>> > relative strength might also give a clue as would daytime vs: night
>> > time strength. All crude but might at least tell if it were coming
>> > from the U.S. or somewhere else.
>> >
>> > On 1/4/2019 10:24 AM, Kenneth G. Gordon wrote:
>> >> On 3 Jan 2019 at 20:45, Richard Knoppow wrote:
>> >>
>> >>>      3J would be China but Q has always been reserved for
>> >>> operating signals (Q signals) so there are no call signs
>> >>> beginning with Q. Probably not real signs. Be interesting if
>> >>> anyone with directional antennas could get a fix on it and
>> >>> triangulate with someone else.
>> >>
>> >> Wouldn't that sort of DFing require an Adcock array?
>> >>
>> >> Ken W7EKB
>> >>
>> >
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