The following table includes all TV and FM signals received by the author, via multi-hop sporadic E. The distances will help other DXers determine a realistic view of the potential for multi-Es propagation.
Table 1: 45-92 MHz TV reception
Frequency (MHz) |
Channel |
Call letters |
City, Country |
Distance miles |
Time EST |
Date |
48.23958 /53.74 |
chE2 |
TVM 1 |
Genting Sempah, Malaysia |
4,100 |
1900 |
19-11-2000 |
48.2495 / 53.75 |
chE2 |
TVM 1 |
Limbang, Malaysia |
3,560 |
1600 |
18-1-95 |
48.26 / 53.76 |
chE2 |
? |
Malaysia or Thailand? |
3,500 + |
1600 |
18-1-95 |
48.2602 |
chE2 |
? |
Malaysia or Thailand? |
3,500 + |
1600 |
18-1-95 |
55.25 / 60.75 |
chE3 |
RTM |
Johore Bahru, Malaysia? |
3,900 |
1600 |
18-1-95 |
55.25 / 59.75 |
chA2 |
ABS-CBN |
Manila, Philippines |
3,900 |
1900-2000 |
10-1-98 |
55.2505 |
chA2 |
Low pwr relay |
Unidentified tx Philippines |
~3,700 |
1900 |
10-1-98 |
55.2514 (warbly) |
chA2 |
Low pwr relay |
Unidentified tx Philippines |
~3,700 |
1900 |
10-1-98 |
55.25 / 59.75 |
chA2 |
KVZK |
Pago Pago, American Samoa |
2,700 |
1400 |
28-12-93 |
62.2491 |
chE4 |
TVRI |
Ujung Padang, Indonesia |
2840 |
1725 |
18-1-95 |
62.260 |
chE4 |
? |
Malaysia |
3,500 + |
1725 |
18-1-95 |
61.25 |
chA3 |
ASTL TV-3 (now QRT) |
Nukalofa, Tonga |
2,000 |
1630 |
16-1-94 |
64.25 under local |
ch2 |
ABW-2 |
Perth, Western Australia |
2,040 |
1900 |
25 12 91 |
64.24 under local |
ch2 |
ABAW-2 |
Albany, West Australia |
1,900 |
1900 |
25-12-91 |
86.24 / 91.74 |
ch3 |
BTW-3 |
Bunbury, West Australia |
2,040 |
1900 |
25-12-91 |
Table 2: 88-108 MHz FM radio reception
Frequency (MHz) |
Channel |
Call letters |
City, Country |
Distance miles |
Time EST |
Date |
90.6 |
250 watts |
FM-96 |
Tavua, Fiji |
2,000 |
1400 |
00-0-94 |
91.0 |
100 watts |
RFO Alo-1 |
Mt Mamati, Futuna Island |
2,340 |
1400 |
16-1-96 |
92.1 |
15 kw |
KSBS |
Pago Pago, American Samoa |
2,739 |
1400 |
17-1-94 |
93.1 |
1 kw |
Yumi FM |
Port Moresby, PNG |
1,710 |
1543-52 |
25-1-99 |
93.3 |
60 kw |
6ABC FM |
Bunbury, West Australia |
2,040 |
1900 |
25-12-91 |
94.5 |
50 kw |
6ABC FM |
Albany, Western Australia |
1,900 |
1900 |
25-12-91 |
95.4 |
1 kw |
FM-96 |
Lautoka, Fiji |
2,000 |
1400 |
25-12-93 |
95.4 |
500 watts |
FM-96 |
Labasa, Fiji |
2,000 |
1400 |
00-00-95 |
95.5 |
3 kw |
6ABC FM |
Kalgoorlie, West Australia |
1,740 |
1400 |
00-00-95 |
96.0 |
1 kw |
FM-96 |
Suva, Fiji |
2,000 |
1400 |
00-00-95 |
97.4 |
1 kw |
Navtarang |
Lautoka, Fiji |
2,000 |
1400 |
00-00-95 |
97.7 |
50 kw |
6ABC FM |
Perth, Western Australia |
2,040 |
1900 |
25-12-91 |
98.0 |
1 kw |
Radio Fiji 1 |
Suva, Fiji |
2,000 |
1400 |
00-00-95 |
98.4 |
1 kw |
Radio Fiji |
Lautoka, Fiji |
2,000 |
1400 |
00-00-95 |
98.8 |
1 kw |
Navtarang |
Suva, Fiji |
2,000 |
1400 |
00-00-95 |
98.9 |
50 kw |
6ABC FM |
Northam, West Australia |
2,000 |
1900 |
25-12-91 |
99.6 |
500 watts |
FM-96 |
Ba, Fiji |
2,000 |
1400 |
00-00-95 |
100.1 |
10 kw |
8HOT |
Darwin, Northern Territory |
1,960 |
1400 |
14-1-95 |
100.2 |
1 kw |
Radio Fiji |
Suva, Fiji |
2,000 |
1400 |
00-00-95 |
100.9 |
10 kw |
8SBS |
Darwin, Northern Territory |
1,960 |
1400 |
14-1-95 |
103.0 |
250 watts |
Radio Fiji |
Vunatavou |
2,000 |
1400 |
20-1-96 |
104.4 |
1 kw |
FM104 |
Suva, Fiji |
2,000 |
1400 |
20-1-96 |
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Multi-hop Es reception in Australia
Multi-hop sporadic E propagation in Australia is most frequent during the summer months of December and January. Distances received, generally are 1,900-2,700 miles for double-hop, and 3,000-3,900 miles for triple-hop. Four-hop sporadic E propagation has been noted on rare occasions. An example of four-hop Es is the reception of KVZK American Samoa chA2 55.25 MHz video and 59.75 MHz audio in Perth, Western Australia, at a distance of 4,700 miles.
At times it is difficult to decide if 3 or 4 hops were involved. For example, Genting Sempah, Malaysia chE2 48.2396 MHz video and 53.74 MHz audio has been received in Sydney, Australia via multi-hop sporadic E. The distance was 4,100 miles. This reception was either by 3 long ~ 1,400 mile hops, or 4 short ~ 1,000 mile hops.
ABS-CBN chA2 Manila, Philippines has been received via triple hop Es. The 59.75 MHz audio was also present, strong enough for wide FM reception.
Manila is located approximately 500 miles north of the geo-magnetic equator. The vicinity of the geomagnetic equator offers an Es
reflection point during the day (equatorial Es). This bridges the
hemispheres, and theoretically makes it possible to receive DX via multi-hop
Es from the other hemisphere at the solstice at sunspot minimum.
The most frequent reception via double-hop sporadic E is the path from RTQ Toowoomba, QLD channel 0 46.1718 MHz into Perth, Western Australia. The path distance is ~ 2,000 miles.
Reception of New Zealand channel 1 45.25 MHz video is received in Perth every year, via triple-hop Es, at a distance of ~ 3,400 miles.
David Vitek, Adelaide Australia, frequently receives New Zealand TV channels 1 and 2 via double-hop Es (2,000 miles).
With more exotic modes of VHF DX propagation such as multi-hop sporadic E, a VHF receiver that includes SSB is a prime requirement for detecting weak TV signals. The ICOM R7000, R7100, R8500, and R9000 scanning receivers are all excellent in this regard.
Visual identification of band 1 TV signals via multi-hop Es is often difficult because of typical mediocre video quality. This is due to reflections from two or more E layer clouds, causing multi-path and ghosting. Also, signal levels are usually not strong because of losses associated with reflections off more than one E cloud. In these instances, precision frequency measurement of the video carrier is often the only option for identification of the signal. For more information on these techniques: TV video offset database.
My most distant FMDX via double-hop sporadic E is:
Sydney - KSBS-FM 92.1 MHz 15 kW American Samoa: 2,739 miles, or 4,409
Km.
To the best of my knowledge, 3,050 miles is the current world record for FM via sporadic E.
TV sets for reception of weak signal modes, such multi-Es or F2
It is next to impossible to find TV sets, which are
both multi-standard, and also suitable for DX TV. The following PDF article explains why: http://homepage2.nifty.com/ffk/d100.pdf
For several years, I have used a Blaupunkt BT 70 -25
VTM, NTSC, SECAM, and PAL 70cm multi-standard color
TV. Because of the various reasons, as stated in the
previous paragraph, I sometimes use this TV with the D100 TV
tuner/converter. However, most of the time I use a Toshiba C-531 5" TV, because multi-hop TV signals are not strong, hence are usually received in black and white.
I use two 5 element band 1 45-70 MHz yagi antennas (one
vertical, and the other horizontal).
Various RF pre-amplifiers, including a RDX Labs UA-700, and
home-built BF981 tunable Mosfet amps are used
for low-level signals.
The D100 TV tuner's output at UHF channel 65 can be
connected to the Blaupunkt, or any other TV. The D100
TV audio output at ~ 35 MHz or 95-108 MHz
(typical), is connected to my Icom R7000 receiver. I
use two 110 KHz filters for Wide FM, and 15 KHz narrow
FM filter, for monitoring DXTV audio
signals. With this set-up, the TV audio sensitivity is
far better than found on a standard TV.
Most DXTV receptions via F2 or multi-hop
sporadic E are typically not strong. For this reason,
I use the narrow IF bandwidth setting on the D100,
to improve the signal to noise ratio.
The German companies Grundig and Blaupunkt make good
multi-standard TV sets.
This page is under continual construction. More log details will be added, as the E layer permits!
Copyright © 2005 Todd
Emslie