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VK7AX  > NEWS     12.04.09 08:49l 693 Lines 27358 Bytes #999 (0) @ WW
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Subj: [vk7regionalnews] VK7 Regional News Broadcast for 12 April 2
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Sent: 090412/0642Z @:VK7AX.#ULV.TAS.AUS.OC #:387 [Ulverstone] FBB7.00g $:VK7AX1
From: VK7AX@VK7AX.#ULV.TAS.AUS.OC
To  : NEWS@WW


VK7 REGIONAL NEWS BROADCAST

FOR SUNDAY 12TH APRIL 2009

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Repeater News

Barren Tier Upgrade

Brian VK7RR provides an update on the recent work undertaken on the 
Barren Tier repeater VK7RIN.

The other Tuesday, Joe VK7JG, Paul, VK5BX who many met at Ross, 
and myself, finally got to replace the antenna on the Barren Tier 
Repeater VK7RIN. The task was not without its difficulties, but at 
least on this occasion there was little wind, which made things 
somewhat easier. 
The new antenna is now in place outside the top of the tower, rather 
than several metres down, as it had been since the wind prevented its 
erection some months ago.

Even sitting at the top of the tower, it is difficult to hold a three 
metre long stainless steel antenna whilst at the same time, trying to 
secure it to the top of the tower.

Joe and I would like to thank Paul who is a highly experienced 
communications engineer, for his help whilst he was here on holidays.

The new antenna gives greater access to the North of the State than it 
did previously. 
Joe is now able to access it from his home in Launceston, as can Norm, 
VK7AC and several others.

Whilst at the site, we also replaced the antenna used to receive the 
broadcast from the South. The original, had been designed for use above 
the amateur band but the new one is resonant at 146.7 MHz. 
Our intention was to further improve performance of the link and to 
further reduce interference from a nearby pager transmitter.

It appears that we have been successful in this respect.

The UHF repeater is now running better than ever. 
It has a battery backup system again, the old one having bitten the dust 
with age, it has new, extremely low-loss heliax feeding it and the new 
antenna so far is performing better than the previous two.

As a matter of interest, we have had a repeater on this site since early 
1984 and in that time, Joe and I have had to visit it on 28 occasions. 
The licence fee is now being paid for by NTARC to whom we provide our 
thanks as all other costs are met by ourselves.

Several years ago the original repeater was destroyed by vandals and until 
now we have had reliability problems, necessitating an unreasonable number 
of return trips. 
The site is quiet inhospitable and we have often been unable to complete 
tasks due to inclement weather.

This repeater serves a vital communications role in the event of 
emergencies in the central highlands, as it is able to be accessed from 
most of the lakes. We have been called on at short notice, to provide 
communications for motor vehicle accidents, drownings, searches for lost 
people and medical emergencies.

A picture of the newly upgraded antennas is available on the REAST website.

http://reast.asn.au/repeaters.php#vk7rinupgrade

(Brian, VK7RR)

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Repeater Milestone

VK7RAA reaches 1000

As heard on the National WIA news there is now a second repeater in VK7 
to reach over 1000 call backs in a WIA broadcast year.

VK7RAA reached 1023 with last week's callbacks and this makes VK7 the 
only state to have two repeaters that have over 1000 call backs.

Congratulations to all amateurs who call in on VK7RAA and a special 
thank you to Tony VK7YBG who religiously reports the callback numbers 
each week.

The WIA broadcast year goes from one AGM to the next and the current 
year started with the WIA AGM which was on 26th May 2008 and will run 
until the 2nd May 2009.

In 2007-08 there were a total of 98434 call backs recorded for the WIA 
National News year, here's hoping we can crack the 100K mark!

(73, Justin, VK7TW, VK7 Broadcast and News Coordinator)

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VK7 EVENTS CALENDAR

A summary of the events across VK7 in the next month:

REAST – April 15, 22 & 29th – ATV Experimenter's Nights – 7:30pm Queens 
Domain Club rooms.

http://reast.asn.au/events.php#ATVnights

TARGA TASMANIA – April 28th to May 3rd.

NWTARIG – May 2nd – General Meeting - Penguin Lions club rooms

REAST – May 6th – Presentation on Landline Telegraphy – 8pm Queen's 
Domain Clubrooms.

NTARC – May 13th -  Royal Flying Doctor Service depot – Launceston Airport 
at 7:30pm with Ian VK7KIH.

NWT-ATVG – June 6th - General Meeting and discussion on radio history.

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Non-Commercial FOr Sale & Wanted

Wanted

Mike VK7KMH is after two mobile antennas. The first is a fibreglass 2m 5/8th 
whip with scalar base and the second is a fibreglass 2m/70cm whip again 
with a scalar base.

If you have either or both of these antennas and would like to part with them, 
Mike will be happy to buy them from you.

Mike can be contacted on 6425 6380.

These will end up being mounted on Mike's motorised scooter to enable him to 
operate mobile/portable.

(Mike, VK7KMH)

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NORTH WEST News

North West Tasmania Amateur Television Group

http://www2.vk7ax.id.au/atvgroup

The General Meeting of the Club held Saturday 4 April was very well attended.

Amongst the important business dealt with at the meeting being the Final 
Adoption of the Club Rules, discussion on the Amateur Radio Promotional Kits 
and the formation of the Club Repeater Committee comprising Tony VK7AX, 
Ivan VK7XL, Jim VK7JH and Graeme VK7AQ.

At the conclusion of the meeting, a break for coffee, tea and biscuits 
was taken.

Whilst enjoying the cuppa, those present were treated to a talk and 
discussion by Ron VK7RN on the subject of the history of both Amateur 
Experimental and Broadcasting Stations in the North West during the 
period from 1921 – 1937.

Of particular interest was the Radio Broadcasting Station 7UV located 
on "Radio Hill" Gawler, just south of Ulverstone which was the prime 
Broadcast station during this period and was ultimately transferred to 
Devonport to become 7AD. Several photos were passed around depicting 
the studio, transmitter buildings, the large mercury vapour rectifiers 
and transmitting tubes used at 7UV.

Of course other amateur experimental stations in the North West area were 
also active during this period from time to time.

The main point noted was the relatively low transmitter power levels used 
in comparison to the much higher power outputs used on the current 
transmitters in use today.

The next General Meeting of the Club is scheduled for Saturday 6th. June 2009, 
when it is planned to have another discussion in radio history, this time 
presented by Barry VK7FR, discussing his experiences as an ABC Announcer for 
many years while working at both Broadcasting and TV Stations within 
Australia and Papua New Guinea.

We will certainly be looking forward to this one.

Those interested in general information about The North West Tasmania 
Amateur Television Group, are invited to visit the Club's WIA web Page 
under VK7 Clubs.

http://www.wia.org/clubs/vk7/NorthWestTasmaniaAmateurTelevisionGroup

73's until next time

(Tony VK7AX, President & News Officer NWT-ATV Group)

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North West Tasmanian Amateur Radio Interest Group

General Meeting

The next general meeting of NWTARIG has been brought forward to the 2nd 
of May 2009 to consider proposals on a possible name change, and to make 
the club an incorporated body. This allow members time to consider the 
options before voting at a Special General meeting called for 30th 
May 2009. The meeting venue is at the Penguin Lions club rooms.

(David Cleland, VK7DC, Secretary, NWTARIG)

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Southern News

Radio and Electronics Association of Southern Tasmania

REAST's May Presentation

On May 6th our historian Richard VK7RO will be presenting a talk on -

Landline Telegraphy or "How to Send Signals Both Ways At Once"!

Richard VK7RO will give a presentation using his vast historical 
knowledge and skill on how Landline Telegraphy work and how they 
send signals both ways at once.

This should be a fascinating and humorous talk by our leading 
historian and avid CW operator.

As Richard commented …it will be a "A little bit of technical history".

See you there.

(REAST Committee)

http://reast.asn.au/events.php#duplexlandline

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Education and Training

If you would like to participate in a future training and/or assessment 
and the assessment could be for any licence (foundation, standard, 
advanced or practical) then let Reg VK7KK know on mobile: 0417 391 607 
or email: regemm(AT)ozemail.com.au

(Reg, VK7KK, REAST Education Officer and Assessor)

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ATV Experimenters Night

We had a fantastic roll-up last Wednesday night with about 15 people 
rolling up. It was great to see some new faces too.

We went out on both analog 70cm and digital 23cm ATV and started with 
a presentation about a Taiyo Musen VHF Adcock Direction Finding antenna 
that Justin VK7TW picked up from the local resource tip shop. There 
was much discussion about how it worked and specifically the mathematics 
to workout how to get a direction of the incoming signal. There will 
certainly be more in future about this interesting antenna.

Thanks especially to Tom VK7TL who has since sent through some great 
material on these antennas.

Our main presentation came via Mike VK7MJ and was a very interesting 
program about electronic TV during WWII under the German regime. 
There was a remarkable amount of R&D into electronic TV and it's use 
during the War under Hitler. They could not record what they were 
broadcasting so much of the footage was from film that was taken during 
the events and show the equipment being used. Much of it was used for 
propaganda and there is footage of the 1936 Olympic games in Berlin.

We then played some more of the episodes of the "Secret Life of Machines".

Ian VK7ZIF has built and brought along a new double 70cm bowtie antenna 
that we will try over the next few weeks to see if we can improve the 
70cm ATV signal.

During the playing of these features Ken VK7DY and Rob VK7MAG did some 
digital ATV field testing on the Eastern Shore and these results showed 
good correlation with the predictive propagation map. We will be 
continuing the field tests over the next few weeks.

There are a group of experimenters including VK7RO, VK7OO and VK7TW who 
are constructing 80/40m one transistor QRP transceivers which is called 
"The Gnat". It is designed by Chris Trask / N7ZWY and the design was 
recently released to the EMRFD mailing list. It is an interesting 
design that makes use of the transistor as a crystal locked power 
oscillator in  transmit mode and a regenerative detector in 
receive mode. 
The interesting feature of this design is the key it what switches 
from transmit to receive mode.

There will be more on this project over coming weeks.

All in all another great night of experimenting.

How do you receive analogue ATV on an ATV night well, ATV goes out 
on 444.25MHz (Channel 16) – just below SBS on the UHF TV Band. 
You will need an antenna with some gain pointed toward the Domain 
to receive our signal so, why not try tuning down the low end of 
the UHF TV band and give us a call on what you are seeing and hearing.

See you there this week.

http://reast.asn.au/events.php#ATVnights

(73, Justin, VK7TW)

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Spectrum/Technology News

Averting Radio Spectrum Saturation, Opportunistically

The following summary is sourced to Science Daily news about 
a week ago. 
Mobile users want better video calls, streaming television and faster 
downloads, placing more demands on the limited radio spectrum 
available to operators. Could handsets that intelligently sense 
their radio environment and opportunistically grab free bandwidth be 
a solution?

A team of European researchers believe they could be. Whereas most 
recent initiatives aimed at making more efficient use of the radio 
spectrum have looked at spectrum management from the network end, 
the team behind the ORACLE (Opportunistic Radio Communications in 
unLicensed Environments) project focused instead on making handsets 
actively manage how and when they use the network.

ORACLE's pioneering approach promises to minimise bandwidth saturation 
in both licensed bands of the radio spectrum, such as that used to 
carry mobile phone signals, and unlicensed industrial, scientific and 
medical (ISM) bands – the kind used by WiFi networks and RFID chips.

The key this project is to have the mobile handsets finding available 
bandwidth and using it in the best way possible. The core technology 
relies on highly sensitive sensors in the handset that monitor radio 
spectrum usage by other devices and base stations in their immediate 
vicinity, combined with software that opportunistically decides when 
and what bandwidth to use when it becomes available. The approach is 
known as Opportunistic Radio.

The technology could, for example, allow handsets to create ad hoc 
networks with other mobile devices in their immediate vicinity to 
share data, reducing the amount of traffic passing through base 
stations and the wider mobile network.

However, as with many technologies in the telecommunications field, 
and despite widespread interest from operators, it may be some time 
before the system developed in the ORACLE project starts being 
implemented commercially.

ORACLE received funding under the ICT strand of the EU's Sixth 
Framework Programme.

http://www.sciencedaily.com/releases/2009/04/090403114925.htm

(Sourced from the Science Daily Mailing List)

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Random Antenna Arrays Boost Emergency Communications

In a similar story about opportunistic use of the spectrum, come s a 
story that first responders could boost their radio communications 
quickly at a disaster site by setting out just four extra transmitters 
in a random arrangement to significantly increase the signal power at 
the receiver, according to theoretical analyses, simulations and 
proof-of-concept experiments performed at the National Institute 
of Standards and Technology (NIST).

The NIST work may provide a practical solution to a common problem in 
emergency communications. The vast amount of metal and 
steel-reinforced concrete in buildings and rubble often interferes 
with or blocks radio signals. This was one factor in the many 
emergency communications difficulties during the response to the 
attacks on the World Trade Center on Sept. 11, 2001.

Antenna arrays have been studied and used for years, but the latest 
NIST work provides several new twists. Unlike the typical case in 
which antenna arrays boost signals to or from a distant target, 
a first responder's radio would be relatively close to the 
portable transmitters, ideally within the perimeter of the array. 
More importantly, since disaster sites rarely allow for niceties of 
design, NIST studied the benefits of a fast and imprecise 
technique—randomly placed antennas combined with coarse signal 
matching. The signals produced by the radio and portable 
transmitters need to operate at the same frequency and roughly 
in phase, such that the radio waves are fairly well synchronized 
and thus build on each other. Phase-matching was performed manually 
in the experiments but might eventually be possible remotely.

The NIST experiments covered a range of communications scenarios, 
using up to eight transmitters at different locations as well as 
objects such as concrete blocks that scatter radio waves. Across all 
experimental scenarios, researchers observed at least a 7 decibel 
median power gain—roughly a five-fold increase in the median received 
power—when splitting the power among four in-phase transmitting 
antennas, compared to using just a single transmitter. More important, 
researchers observed a 2.5 to 4-fold increase in the median signal 
at the radio receiver when using four in-phase transmitters instead 
of four randomly phased transmitters. More than four extra 
transmitters offered diminishing returns. (Unlike conventional 
repeaters, which re-send signals to maintain transmission strength 
across long-distance networks, the antennas in the NIST scenarios 
transmit the same signal at the same time to multiply its strength.)

Project leader Chris Holloway envisions portable transmitter devices 
shaped like hockey pucks, incorporating a small antenna and 
phase-shifting electronics, which could be thrown on the ground or 
stuck on a wall with the antenna always upright. "The idea is that 
someone, or even a robot, would have a bag of these things and would 
drop them off as they go through a building," Holloway says. 
Other authors include a guest researcher from Sandia National 
Laboratories and a collaborator from the University of Colorado 
at Boulder. 
The work was funded in part by the Office of Community-oriented 
Policing Services of the U.S. Department of Justice.

http://www.sciencedaily.com/releases/2009/02/090225151337.htm

(Sourced from the Science Daily mailing list)

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Space Weather

More on that Spotless Sun!

In a report from the Science (AT) NASA website a comparison has been made 
between the sunspot cycle and the stock market. Just when you think it 
has hit bottom, it goes even lower.

2008 was a bear. There were no sunspots observed on 266 of the year's 
366 days (73%). To find a year with more blank suns, you have to go 
all the way back to 1913, which had 311 spotless days:

http://science.nasa.gov/headlines/y2009/images/deepsolarminimum/centuryplot_gif2.gif

As reported last week - 2009 have dropped even lower.

However there are some other records being set along with the lack 
of sunspots:

A 50-year low in solar wind pressure: Measurements by the Ulysses 
spacecraft reveal a 20% drop in solar wind pressure since the 
mid-1990s—the lowest point since such measurements began in the 1960s. 
The solar wind helps keep galactic cosmic rays out of the inner solar system. 
With the solar wind flagging, more cosmic rays are permitted to enter, 
resulting in increased health hazards for astronauts. Weaker solar wind 
also means fewer geomagnetic storms and auroras on Earth.

A 12-year low in solar "irradiance": Careful measurements by several 
NASA spacecraft show that the sun's brightness has dropped by 0.02% 
at visible wavelengths and 6% at extreme UV wavelengths since the 
solar minimum of 1996. The changes so far are not enough to reverse the 
course of global warming, but there are some other significant side-effects: 
Earth's upper atmosphere is heated less by the sun and it is therefore 
less "puffed up." Satellites in low Earth orbit experience less atmospheric 
drag, extending their operational lifetimes. 
Unfortunately, space junk also remains longer in Earth orbit, increasing 
hazards to spacecraft and satellites.

A 55-year low in solar radio emissions: After World War II, astronomers 
began keeping records of the sun's brightness at radio wavelengths. 
Records of 10.7 cm flux extend back all the way to the early 1950s. 
Radio telescopes are now recording the dimmest "radio sun" since 1955:

http://science.nasa.gov/headlines/y2009/images/deepsolarminimum/radioflux.jpg

Some researchers believe that the lessening of radio emissions is an 
indication of weakness in the sun's global magnetic field. No one is 
certain, however, because the source of these long-monitored radio emissions 
is not fully understood.

All these lows have sparked a debate about whether the ongoing minimum 
is "weird", "extreme" or just an overdue "market correction" following 
a string of unusually intense solar maxima.

"Since the Space Age began in the 1950s, solar activity has been 
generally high," notes David Hathaway from NASA MFSC. "Five of the 
ten most intense solar cycles on record have occurred in the last 
50 years. We're just not used to this kind of deep calm."

Deep calm was fairly common a hundred years ago. 
The solar minima of 1901 and 1913, for instance, were even longer 
than the one we're experiencing now. To match those minima in terms 
of depth and longevity, the current minimum will have to last at 
least another year.

But like other forecasters, he knows he could be wrong. 
Bull or bear? Stay tuned for updates.

http://science.nasa.gov/headlines/y2009/01apr_deepsolarminimum.htm?list178401

(Written by Dr. Tony Phillips for the Science (AT) NASA Mailing List)

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Technology News

USB 3 - 10 times the speed USB 2.0.

With more than 2 billion legacy wired USB connections in the world 
today, Universal Serial Bus (USB) is the de facto standard in the 
personal computing industry. On the horizon is the next revision of 
the USB has been released – and it's 10 times as fast as the last one. 
Specifications for the 'SuperSpeed' USB 3.0 were published shortly 
before the first of this year, allowing manufacturers to start bringing 
next generation USB devices to market. Consumer products are likely to 
hit shelves by 2010.

The USB Implementers Forum (USB-IF) claimed the third edition of the 
data transfer system would be 10 times as fast as version 2.0, and 
feature improved power efficiency. It will also be backwards compatible 
with USB 2.0 and 1.1 devices.

So what's next? Wireless USB

Soon, these same, fast, interoperable connections will become available 
in the wireless world, with the introduction of Wireless USB from the 
USB-IF. Wireless USB is the new wireless extension to USB that combines 
the speed and security of wired technology with the ease-of-use of 
wireless technology.

Wireless connectivity has enabled a mobile lifestyle filled with 
conveniences for mobile computing users.

Wireless USB will support robust high-speed wireless connectivity 
by utilizing the common WiMedia MB-OFDM Ultra-wideband (UWB) radio 
platform as developed by the WiMedia Alliance.

UWB technology offers a solution for high bandwidth, low cost, 
low power consumption, and physical size requirements of next-generation 
consumer electronic devices. Wireless USB is the first high-speed 
wireless personal interconnect technology to meet the needs of 
multimedia consumer electronics, PC peripherals, and mobile devices. 
Wireless USB will preserve the functionality of wired USB while also 
unwiring the cable connection and providing enhanced support for 
streaming media CE devices and peripherals. Wireless USB performance 
is targeted at 480Mbps at 3 meters and 110Mbps at 10 meters.

http://www.tech-notes.tv/Archive/tech_notes_143.pdf

(Sourced from the TV Tech Notes Newsletter)

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BPL News

Withering on the Vine

Our final word this week comes from Roger Harrison VK2ZRH who wrote 
the following on the Spectrum Issues Mailing list….

With the federal Government's announcement that they will establish a 
government-owned company to build a fibre-to-the-premises (FTTP) 
network to reach 90% of Australian homes and businesses, broadband over 
powerline will surely 'wither on the line' like wine grapes in a drought.

(Roger Harrison, VK2ZRH via the Spectrum Issues Mailing List)

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Web & Email Edition Extra Bits!!

Optics Links

http://mysite.du.edu/~jcalvert/optics/ophom.htm

http://www.learnoptics.com/

http://www.spocc.com/main_compo.htm

(Following Links courtesy of CG Communicator)

Pictures of a pirate Radio Station: 
http://earthsignals.com/add_CGC/San_Diego_Pirate.htm

An astonishing model railroad in Germany: (5-minute video): 
http://dvice.com/archives/2009/03/astonishing_mos.php

Canada decommissions another AM and demolishes, this one on 1090 kHz.Video 
by Dave Garbe of CFCA-FM/CKKW-FM Ontario, Canada courtesy of Fred Vobbe. 
Note how each tower top tends to land close to the base, like in the 
KFI case: http://earthsignals.com/add_CGC/Images/AM_1090_Demolition.wmv

The most powerful air raid siren ever built (it is claimed): 30 kW, 
powered by a Chrysler Industrial V-8 HEMI gasoline engine: 
http://www.victorysiren.com/x/index.htm

How the bad guys can tap into your cell phone: 
http://www.youtube.com/watch?v=uCyKcoDaofg

Radioactive RFID Technology Being Deployed: 
http://www.sciencedaily.com/releases/2009/03/090324151951.htm

(Following links Courtesy of TV Technotes)

If you are having too good a time and for those who are in need of 
a reality check, check out this video on YouTube. 
http://www.youtube.com/watch?v=jd4tugPM83c

World TV Standards - For anyone that's interested, here's a link for 
TV standards used throughout the world: http://www.kropla.com/tv.htm

Do you have some interesting amateur related sites you have some 
across in the last week – send them in to justingc(AT)ozemail.com.au

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VK7 Regional News Group Email Addresses

Post message: vk7regionalnews(AT)yahoogroups.com

Subscribe: vk7regionalnews-subscribe(AT)yahoogroups.com

Unsubscribe: vk7regionalnews-unsubscribe(AT)yahoogroups.com

List owner: vk7regionalnews-owner(AT)yahoogroups.com

VK7 Virtual BPL Tours Update

http://www.youtube.com/watch?v=pdcY0Eetvsw - Mt Nelson

http://www.youtube.com/watch?v=1gsxpya3CnQ - North Hobart

http://www.youtube.com/watch?v=G7DfdxjRkpU - RU ready for BPL?

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If you are interested in becoming an amateur radio operator or 
upgrading your licence then we suggest you contact your local club 
for details and/or take a look at what the Radio and Electronics 
School has to offer. They have a range of courses that can be delivered 
through a variety of methods.

They can be found at: www.radioelectronicschool.com

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Finally today, a reminder to those people rostered for next 
week's broadcasts:

Newsreader: VK7RS

160m: VK7DM

80m: VK7EM

40m: VK7TW

20m: VK7AR

10m: VK7ZGK

UHF CB: VK7HGO

HF CB: VK7TED

Thanks to all people and organisations who assisted with 
this broadcast.

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THAT CONCLUDES OUR VK7 REGIONAL NEWS BROADCAST FOR THIS WEEK.

YOU HAVE BEEN LISTENING TO OR JUST MISSED VK7WI. NEXT WEEK THE 
NATIONAL WIA NEWS CAN BE HEARD AT 0900 FOLLOWED BY THE 
VK7 REGIONAL NEWS AT 0930 HOURS.

DETAILS TO SEND NEWS FOR THIS BROADCAST CAN BE FOUND AT REAST.ASN.AU 
AND THE DEADLINE FOR ITEMS IS 21:00 ON FRIDAY PRIOR TO THE 
SUNDAY OF THE BROADCAST.


VK7 Regional Broadcast & News Coordinator
Justin Giles-Clark, VK7TW




****************************************************

           - NEWS POSTING TO PACKET - 

 Courtesy Tony VK7AX  VK7AX(AT)VK7AX.#ULV.TAS.AUS.OC

****************************************************


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