VK2FLR VHF DX Sound Archives
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I have placed on this page some Real Audio files containing interesting examples of VHF DX propagation from Sydney, Australia. Latest update is 8 May 2002.

Just click on the file name to download and play.

Six Metres - Cycle 22
Six Metres - Cycle 23
Two Metres
Meteor Scatter
WSJT: J44 and FSK441

Cycle 22
The current Australian six metre DX record VK2FLR to
CU3/N6AMG 27 November 1991 over 19,424km (41KB). The first European six metre contact to Sydney was made by GJ4ICD on 14 October 1991 (54KB).

JA is easy to work from VK during solar maxima. But propagation is not necessariIy the only communication problem. JR6WXY on 11 November 1991 (27KB). JR8DAH from Sapporo, Japan in 1989 (74KB). The JA7ZMA beacon during an afternoon TE opening in 1989 (43KB). Ogasuwara counts as a separate country although it is part of Japan. Here is JD1BFI on 10 October 1991 (31KB).

The usual indicator of propagation to the north is the 49.750 MHz R1 video (35KB).

Other rare stations to the north were KG6UH/DU1 (35KB) and the KC6RR DXpedition (21KB). But Tim V73AT was a regular into VK2 (13KB).

Shel, NI6E/KH6 was informal net controller on 28.885 in our part of the world during Cycle 22. Here he is on six for a change (17KB) and again looking for Eu stations (41KB).
The Hawaiian beacon KH6HME as heard in Sydney on 10 November 1991 (41KB).
A rare station from the South Pacific is FO5DR in Tahiti (15KB). Raj, 3D2ER was often heard in Sydney from Fiji during Cycle 22 (9KB). A very familiar voice on six during cycle 22 operating from KH8 (35KB).

A very rare appearance of the VK0GR beacon from Casey Base on the Antarctic mainland, 12 December 1972 (39KB).

Listen to Bob WA6BYA snatch a VK6 from under a pile-up of VK2s working Mexico in March 1989 (25KB). W6 became relatively common as the cycle progressed. Here are K6STI (14KB) and K6QXY (31KB) in November 1991. Often heard in Sydney during Cycle 22 was Victor Frank's beacon K6FV (26KB).

Geoff, XE1GE was on six for Cycle18. Here he is in Cycle 22 in March 1989 (18KB). Don, V31PC from Belize working Norm VK2ZXC south of Sydney (17KB).

Night-time TEP sometimes produced exotic signals out of Asia such as VS6BI (17KB), which would often result in big JA pile-ups! (39KB) Closer to home was P29PL (9KB).

Single-hop F2 across the Australian continent: VK6JQ in Broome, Western Australia (21KB).

European stations were always difficult to work from Sydney. Some of the louder signals were YU3ZV (23KB) in November 1991 and I4CIL (17KB).
The longest European opening during cycle 22 to Sydney was in February 1992 but signals were weak. Listen to OZ4VV (35KB), ON4GG (33KB) and ON4ANT (31KB).

Cycle 23
The Central American path opened up in early April 2000 with
TG9NX (15KB), ZF1DC (21KB), XE1BEF (23KB) and on most mornings the XE1KK (45KB) beacon. The best DX in this direction was Puerto Rico and PJ2/WZ8D on both SSB (17KB) and CW (25KB) from Bonaire.
Some excellent F2 openings to the north produced YB0ARA/9 (45KB), 9M2/JI1ETU (31KB), 9M2TO (70KB) (note the Malaysian TV buzz towards the end of this clip) and T88JU (19 KB). Listen also to VK4 and VK3 F2 backscatter (64KB) signals calling T88JU and the VK8RAS (54KB) beacon in Alice Springs copied on F2.
From the Pacific (among other DX) we had KH8/N0JK (23KB), V73AT and the V73SIX (56KB) beacon, plus the usual stateside openings such as K6QXY (35KB).

The southern hemisphere spring equinox favours long north-western paths out of VK. October 31 2000 produced the only European opening from Sydney this cycle, with propagation to Poland, Germany, the Czech and Slovak republics, former Yugoslavia and Italy. The opening lasted for about 90 minutes. Signals were up to 579 on CW and 55 on SSB. Eu stations worked by VK2FLR were SP6GZZ (45KB), DL7AV, DL3DXX (28KB), DL9USA (88KB), SP6ASD (77KB), OK1KT, OK1ACF, OK1ZE, SP6DNS, SP9HWY, SP6GWB (23KB), OK1VD, OM3LO, I0JX (23KB), I0WTD, IK0FTA (39KB), IK6GZM, I3LDS (28KB), S53X (28KB), IK5OEA, 9A3RE (50KB), IK4DRY (28KB), I4CIL (41KB, compare with the 1992 opening) and IK5YJY. The clips here were kindly made available by VK2QF.

And from the other end, here is a recording of the QSO (195KB) between IK0FTA and VK2FLR on 31 October 2000, as recorded by IK0FTA. Note the JA QRM on VK2FLR.
Thanks Sergio!

The big X-class flare on 30 March 2001 produced the best aurora since November 1991. Here is VK3CAT (39KB) on SSB with VK2BHO and VK3SIX, also with VK2BHO (95KB). More difficult was the VK7RAE (39KB) beacon in QE38. The roaring sound is the carrier which idents 8 seconds into the clip.
See below for 144 MHz clips from this event.

The big jump in solar activity at the end of March and the beginning of April 2001 produced some solid opening into VK2 from Central and North America and the Pacific. Among the new ones were V31RH (64KB), ZF1DC and YS1RR (41KB).
April 8 produced a solid opening to the west coast of the USA with K6QXY (46KB), W6QUV (25KB) and KB6NAN (39KB), among many others in W5 and W6. After change of day we had TI5KD (27KB) and a direct F2 path opening into Darwin with VK8MS (35KB) and the Darwin beacon, VK8VF (55KB).
Central America was back in again on April 12 with TI2ALF (37KB), TI5BX, TG9SO (60KB) and HP2CWB (25KB), and then 3D2AG/P (19KB) on Rotuma which is fairly rare, as is FW5ZL (23KB) on Wallis Island.
After change of day some solid Es linked us up with Hawaii and KH6SX (45KB), plus a vast VK pileup with WH6O (154KB). Checking the beacon sub-band during this opening produced KH6HI (55KB).
Another Pacific station on just before Easter was KH8/N5OLS (39KB).
A disappointment was the absence of China during the night-time TEP openings, even though VR2XMT (31KB) in Hong Kong was available.

Conditions for the 2002 autumn equinox were down on the previous year, but some interesting DX was available. On 12 March we had JT1CO (39KB) from Mongolia and 9M6AAC. Towards the end of March there was a run of several days with ZF1DC, TG9SO, K6MYC, P43JB (39KB) and PJ2/DL4WK (39KB) into Sydney. Early April produced the usual Central American signals. Here is XE1KK (25KB) interrupting a chat with XE1UN to snap up a VK2 on 4 April.
Probably the best day was 19 April when an intense hotspot over Darwin produced strong backscatter from VK9ML on SSB (35KB) and CW (39KB), plus loud backscatter from VK2 and VK3 (268KB) calling 9M6CT (66KB). We also had a rare appearance from two Indonesian stations, YB5QZ and YB9AY (56KB) in Denpasar, Bali.

The most common DX mode out of Sydney on two metres and up is so-called "aircraft enhancement" which allows regular contacts out to 700km. Examples here are
VK1BG (19KB) at around 300km, VK3ELV (17KB) at 500km and at over 700km, VK2FZ/4 (15KB) north of Brisbane and VK3AMZ (17KB) west of Melbourne. Note the meteor burst on VK3AMZ's transmission.

Sydney is well-placed for tropospheric ducts across the Tasman sea to New Zealand during summer. Paths are typically 2,100km. Frequently heard during openings are ZL1IU (9KB) near Kaikohe, North Island, and the ZL3MHB (27KB) beacon in Greymouth, South Island.

Inland tropo ducting on 144MHz is fairly rare in Sydney. Here are VK5VF (21KB) and VK5NY (21KB) received over the 1200km path between Sydney and Adelaide.
Listen to VK3AMZ powering into Sydney on 144MHz during an aurora on 9 November 1991 (27KB).

The 31 March 2001 aurora produced VK5NC (43KB) operating /p from QF01 and VK3BRZ (82KB) near Melbourne. Both clips are from just before the aurora faded out in Sydney.

The activation of the 46 metre Algonquin radio telescope by VE3ONT in 1993 and 1994 produced tremendous signals off the moon on 144MHz. Listen to
VE3ONT calling a VK1 (33KB).
The loudest signal out of Japan on two metres EME has to be JL1ZCG. This was recorded using a home-brew SCAP audio filter at a bandwidth of about 40Hz (86KB).
My own echoes from the moon on two metres recorded just after moving up to four yagis in 1994. Mind you, conditions were very good at the time (44KB).
But you don't need big antennas to work EME. Here is W5UN heard on a single yagi in 1992 (34KB). Here is Dave again, (19KB ) this time heard through a narrow audio filter.
With only two yagis, stations like DL8DAT (43KB) and SM5MIX (20KB) are easily workable. One interesting EME contact made with two yagis was with VK3AMZ (29KB). Note the higher pitched meteor ping 2 seconds into the clip and the same characters "VK" repeated 2.5 seconds later off the moon. BTW, I have now worked VK3AMZ by tropo scatter, meteor scatter, aurora and EME. Is this a record?

And for the very latest in EME, here is a screen shot from a JT44 EME contact with GM4JJJ (36KB) in April 2002, using Joe Taylor's superb WSJT progam. The shot is GM4JJJ's reception of VK2FLR using just one yagi on the horizon. The picture was created by playing two .WAV files through the program to show two transmissions from VK2FLR. The date on the screen is the date the picture was created, not the date of the contact!.
The first (62KB) signal at -15dB is just audible but the second (62KB) signal at -22dB is not.

Meteor Scatter
The Leonids meteor shower in November 1998 produced some great contacts on 144 MHz. Here is VK4KK (13KB) working VK2TWR and VK4IC (14KB) working into VK1 and again (11KB) into VK2.

The 2001 Leonids produced a meteor storm over eastern Australia with zenith hourly rates peaking at almost 3,000 between 1700 and 1800 UTC on 18 November. Over 80 stations from VK1 to VK7, ZL and YJ8 were heard or worked via meteors on 144 MHz that morning. Some of the loudest signals in Sydney were VK4BLK (25KB), VK4ABW (50KB) and VK5NY (62KB). The VK calling frequency on 144.100 ran hot with pileups (58KB) during long burns, when DX stations were louder than the locals. Another good signal was VK7MO (48KB) in Hobart, about optimum Es distance from Sydney. Amid the 144.100 QRM, it was often difficult to decide who was working whom. Here is VK2OM not working VK3CAT.
Low power beacons such as VK3RGL (43KB) were consistently audible during long burns.

But you don't need to wait for meteor showers to get get contacts. Joe Taylor's WSJT software raises the probabilily of completing meteor scatter contacts on 144 MHz to almost 100% - on random meteors. Here is a screen shot of VK7MO (37KB) working into Sydney on an average morning.
And this (13KB) is what it sounds like.

Oscar 13
The Oscar 13 Mode B downlink heard on 8x8 crossed yagis. Here are
DC6AK (25KB), I7UGO (21KB) and UA0DG (43KB) in 1992.
Tuning across the downlink passband often sounded just like 20 metres on a good pass (74KB). The Oscar 13 telemetry beacon on 145.810 (17KB).

These links will take you to other sites with VK VHF DX audio clips.
VK6RO Real Audio clips of DX audio, some dating back to the late 70s to early 80s and up to March 2001.
VK2QF Neville Mattick's homepage with audio clips and band reports.
VK3NM Audio clips of 50MHz propagation from Melbourne.

Michael J Farrell VK2FLR email galuff@ozemail.com.au