Off-air recordings Mike Radio, recorded by listeners.
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NEW MIKE RADIO HEARD IN FINLAND Nice audiofile / sdr video on Youtube from Mike Radio on 1512 kHz heard by Joakim in Raasepori Finland (thanks!). Broadcast on sundaymorning 19th of march 2023. Click on the link below for the video and have the experience how reception is on medium wave band:
https://youtu.be/O7ia_L4p7vg?t=161
April 2, 2022 Audio file from Adolfo, in Cangas de Onis in Spain. Receiver portable radio: XHDATA D-808 with few meter wire as antenna, frequency 5800 kHz @ 17.16 UTC:
Short audio file made by John Fisher in New Foundland Canada. Date 14th of november 2021 @ 0734 to 0748 UTC Frequency : 5800 kHz SINPO : 54444 (in Newfoundland ): See also report book entry by John Fisher.
Next video made by Robert from Oranienburg / Berlin / Germany. Reception by Sony icf sw 55 with Whip Antenne . Date 26 th september 20021 on frequency 4895 kHz:, 21.20 CET ink: https://www.youtube.com/watch?v=luAvkAWvjYc
Nice video made by Ron -‘bike-dx-er’ outdoors near Edinburgh, Scotland @ summer night in june 2021, link: https://www.youtube.com/watch?v=HCaW8Fxcb30
SDR video from Finland: the red colour intensity of the bar -in the video- implies the fullness of the AM sound (more than the signal strength).
Reception video of Mike Radio made in United Kingdom, testing frequency 1620 AM mediumwave. Link: https://www.youtube.com/watch?v=sIXCS7SbVtQ
Recording made on 28 december 2017, @ ‘daylight’ at 14.30 CET, testing frequency 1620 AM, near Gothenburg in Sweden by Staffan Crona:
Long audio recording; about 16 min. from Al in Punxsutawney in Pennsylvania USA, astonishing good reception on frequency: 3920 AM short wave band, date: 09 Feb 2019 and time: 16.40 to 17.20 UTC . Recording made from own portable radio: Degen DE-1103. Audio clear- and loudness seems to be important on long distance transmissions. TX: Telefunken 2525/3.
Recorded in the USA from the portable radio Degen DE 1103, very popular radio among shortwave listeners outdoors.
Part of audio report made in Russell in NE of New Zealand, by John ( using the NZR DX leagues SDR in Russell NZ). Reception is possible by long path travelling ** on 5810 kHz, sunday 3(th) of January 2021, between 07.51-08.17 UTC ). See reportbook for details.
The window to reach New Zealand by long path was open for about 30 – 40 minutes .
We did the same transmission again on the 10th of january, 1 week later. Also than was reception possible at about the same time at resonable levels in NZ. There were each time no sunspots numbers but quite low noise levels.
A bit science: long path, how does it work:
**Long path propagation
The long path runs the other way around the globe. Starting from The Netherlands, along the Azores, Atlantic Ocean northern Brazil, Peru, over the Pacific Ocean to finally New Zealand. A distance of roughly 20,000 km. The long path to New Zealand would be 7 to 8 hops in theory. The signal departs in daylight, traverses the complete darkness side of the Earth, and descends into the light again (long path).
Signal that bounces alonge the ionosphere
Chordal hop propagation is a propagation mode involving the daylight F2 layer and night time F layer. At daytime there are two upper layers in the ionosphere, the F1-layer at ± 150-200km and the F2 layer at 250-400km. Shortly after sunset these two layers merge into the F layer and split up again into F1 and F2 layer at sunrise. During night time the F layer loses it’s ionization density, and it’s ability to reflect signals back to Earth. But sometimes the F-layer is just dense enough to reflect the signal back, but with a less steep angle, causing the signal to be directed to another part of the ionosphere thousands of km’s ahead, not touching the ground. Here is a picture that I have drawn to visualize.
PA9X is here TX Mike Radio – The Netherlands
VK5ZQZ is here RX John in New Zealand
With chordal hop propagation you have less attenuation due to the fact the signals does not reflect against Earth’s surface. In this occasion the signal that uses long path propagation arrives at the other station with less attenuation, thus with a (better ) signal than by the short path. One Funny thing is that a station at night time, like imaginary station PY4FTL in Rio de Janeiro in Brazil, has signals travelling far above through the ionosphere, but he cannot receive them!
More theories
There are also scientist that believe that chordal hop could be the result of signals that travel between the F2 or F layer and a sporadic-E layer. One more theory is that a signals travels within the F2 or F layer in a kind of duct for thousand of km’s.
Finally, you see the sunlight / darkness situation in the map during the period of best reception:
NL – NZ: TX and RX site just or still in sunlight (important for take off by F2 layer(TX) and RX to land). Link: see picture here