QRM July1980

1980sDocument19801984 Tas Hamfest NW Branch Penguin Hall by Greg VK7ZBTQRM 1980

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Registered for Posting

TASMANIA
as a Publication,
Category B.

AMATEUR
RADIO
Bulletin issued by the North, North West and
Southern Branches of the Wireless Institute
of Australia, Tasmanian Division.

P.O. BOX 275
LAUNCESTON
TAS. - 7250
JULY 1980 VOLUME 10 No. 6
- -· ·-
. _ _ __.-, ~ -

Meetings South 2nd North West 8th North 11th Council" on air " 25th, 8pm,
I 3590 Khz ssb.

EDITORIAL
Writing an editorial is a difficult task at the best of times in
trying to avoid contentious issues that may brand one as a "Stirrer"
or equally, as a negative thinker producing a non event.
It i's doubly difficult following the objectives of the North by
Reg VK7KK and the eloquence of Barry VK7NRA from the South; However
the thought of both the field day and the participation aspect brings
to mind the large number of newer members present at the Port Sorell
mini Hamfest in 1979 who were absent this year.
It seems that even though we talk to each other and "Communicate"
we do not really know each other as people who share a common hobby.
Whilst Translating participation in a State Field Day to a reality,
perhaps we could use the coming TARC as a preparation ground and make
every effort to attend.
Here would be an opportunity to get to know more amateurs and to
set up the planning group and a structure for participation in a
State Field Convention.
73 Peter Fudge
VK7BQ
2RM Page 2
SOUTHERN BRANCH NOTES.
First of all it was encouraging to get such a good response to
the advert in QRM for the Southern Branch Store. We had enquiries,
orders and purchases from all Branches. The Southern Branch
Executive is in the process of building up the stock so that we
can satisfy most, if not all, needs. We feel that the store is one
of the biggest advantages members have through their WIA membership.
The June meeting was well attended and I believe everyone 'had a
good time., During the business part of the meeting a discussion arose
about gaining permission to erect a tower •• Sam VK7NSG told us
about the troubles he was having with the council and neighbours.
From the discussion it would seem to be a good idea, when thinking
about a tower, to discuss it with other amateurs as much as possible
before seeking official approval. Their experience may save you a
lot of heartache.
We also saw the Videocassette of the 7JIRL DXpedition. Apart
from a cassette prone to jamming all the way through I think most
people found it interesting and hopefully entertaining.
To round the evening off we had an auction. Harvey VK7HK as
probably our most skilled auctioneer managed not only to sell the
articles but to make it entertaining at the same time. The whole lot
was cleared and about $67 went to club funds. Thanks Harvey for
your help.
Its the end of the financial year and at the next Southern
meeting we will have a Treasurers Report. Also perhaps a talk and
possibly a demonstration of Resuscitation Techniques for use in
the case of electric shock.
A reminder about the next WAGS event. BINGO ON THE th JULY.
Not only Bingo but Computer Bingo. Tom VK7TM is arranging the
equipment for this and it should be interesting to see how it
works out.
well, thats it for now. 73 to all VK7s from the Southern Branch.·

Barry VK7NBA.

FOR SALE. Filter coils to suit I.G.L. receiver, VK7ZRF
Phone 982361.
QRM Page 3

NORTH WEST BRANCH NOTES.
The usual well-attended meeting was held on JUNE 10th 1980,
there being a total of 28 members and 1 visitor.
MINUTES of the last meeting were read by the Secretary and adopted.
TA 198Q A committee meeting was held at the home of Peter VK7B and
TYL Joan, on Sunday June 8. A lot of valuable ground was covered,
and details were outlined to members. At the conclusion of··the •
meeting, the ladies served a most tasteful afternoon tea, after which,
Peter showed the group some of his HOME BREW capabilities. The writer,
along with several others, displayed interest in his latest effort.
This was not the usual 2 Tone Grey device, but something of a different
colour. Many glowing remarks were made to Peter in praise of its
construction.
s,E,s. A discussion was held at the Branch meeting regarding the
N.W. Branch affiliating with S.E.. A vote to this affiliation was
taken, which was carried unanimously.
• I
2SL BURQ Don VKTNDP advised that this section is now working so well,
that no internal postage is now necessary.
CORRESPONDENCE INWARDS. A letter was received from VK3Q X G3-LMT,
- regarding suppression of Power Line QR. A letter was received from
the Penguin High School, offering use of Computing facilities after
school hours.
OUTWARDS. Details were presented to members.
WINE AND CHEESE evening to be held at the home of Peter VK7BQ and
XYL Joan on July 19th at 8pm.

ACTIVITIES Tony VK7AX, gave a most interesting illustrated lecture
on the ATV and FM Repeaters, giving details of the site on MT.
DUNCAN --the highest peak on the Dial Range. The Branch has been granted
a 5 year lease of the site.
Details of the installation and associated equipment was given,
Tony also advised that colour transmission is also proposed. So as
not to upset any environmentalists, the Tower is even going to be
painted to blend in with the scenery. The environmentalists may be
comforted to know, that in the event of any emergency, this equipment
could be pressed into service - Painted Tower and all.
Tony was thanked for his most interesting lecture. Supper, served
by Burnie members, concluded a most enjoyable evening.
P,S. I made mention in last month's notes, that one of Australias Grand
0la Men of Radio - MAX HOWDEN, VK3B, hopefully was going to attend
TARC 1980. I regret to advise that this now will not be possible. -
Max is now a SILENT KEY.
VY 73 Till next month
Jim VK7NOW.
2RM Page l

NORTHERN BRANCHNOTES.
The monthly meeting of the Northern Branch was held at Bourke
Street on 13th June. The meeting was chaired by Reg, VK7KK with about
25 members present. No doubt the very cold weather kept some away
as there were numerous apologies. Vote of thanks to Brian for setting
a roaring fire - much appreciated as the wiring for heaters is yet
to be completed.
In inward correspondence, a letter was received from Bill 7TE,
relinquishing his position as clubroom manager. Robin 7RH informed
the meeting that he believed that Bill has been ill recently. The
meeting expressed the hope that Bill recovers quickly and that we
may see him back at the meetings.
A letter from the Riverside Jaycees, indicating that a hobby
display was to be held at the Albert Hall on the weekend of 12th to
1luth of September, and that the W.I.A. are asked to provide a
display as in previous years. Anyone who wishes to assist could they
please contact Reg, 7KK. \

At this stage, the lecturer for the evening arrived and it was
decided to proceed with the lecture as he wished to be away as soon
as possible. The lecture was on F.M. Stereo Broadcasting, presented
by Roger Greenwood, a Telecom Engineer who is involved in both the
community F.M. group privately, and with Telecom in establishing the
ABC FM transmitter.
Roger spoke on the design parameters for the FM stereo system,
with the ZENITH - G.E. system being the one used in Australia as in
most overseas countries. The system had to be compatible with mono
and stereo receivers and to allow a stereo receiver to distinguish
between left and right channels for correct reproduction. Occupying
about 53 KHz of bandwidth, a L+R signal, an amplitude modulated,
suppressed carrier signal containing L-R information, plus a low
level 19KHz pilot frequency for synchronizing the receiver to the
suppressed carrier of 38 KHZ.
This pilot is also used in the receiver to light the L.E.D.
that indicates sufficient signal strength for stereo transmission.
Roger made good use of an oscilloscope to illustrate the transmission
of L+R and L-R information from a stereo encoder unit. The ABC FM
signal will be on 93.9 MHz at a ERP of 50KW, and is diplexed onto
the existing channel 3 TV antenna on Mt. Barrow.
In questions to follow, Joe 7JG asked Roger about spurious
frequencies either side of 51.75 MHz, which is the high level
spurious produced by the channel 1 translator at the Juliana Street
site. These secondary spurii were caused by signals from the new
ABC FM stereo Transmitter mixing with 51.75 MHz. This problem will
be cured with the replacement of filters to be installed shortly in
the FM Tx.
John 7CCC was asked to thank Roger for his excellent lecture,
on behalf of the club and invited Roger to stay for supper and a
rag chew. The time was quite late at this stage so the meeting was ;.
closed and supper served.

73 Ken VK7ZKT.
QRM Page 5

NORTHERN EXECUTIVE MEETINGS NOTES.
These are now to be held on the Friday following Branch meetings
rather than the Friday before.
Next meeting July 18th 8pm at
Andre Everts QTH, Riverside.
The meeting held on June 2Oth was attended by eight office bearers
and planned activities for the remainder of the year: these include
visits, technical talks, social activities and constructional
activities. Regular fox-hunting activities are also to be organised.
More details later.
Ken Kirkman volunteered to act as clubroom manager following
Bill Tanner's resignation. Thanks Bill for your work in this position
and trust that you are recuperating satisfactorily.
A raffle is to be organised to help cover expenses involved in
running and rebuilding the Mt. Barrow repeater. Please help when
these tickets become available next month.
Next Meeting Northern Branch July 11th at 7,45 p,m.
An equipment sale - bring your gear for disposal, either donate
it for auction or just offer it for sale on your own behalf.
Come along and stock up your junk box!

NOVICE LICENCE CLA SS.
A reminder that a new class will be beginning soon at the
Launceston Technical College.
SCRABLE,
The Northern Branch is now holding a VHF/HF Scramble event
Sunday night starting at 8.00 p.m. and runs for 30 minutes. The first
was held on Sunday (the 22nd) and for those who participated was
quite successful. It takes place on 2 Meters, Rep 8 and Channel 40,
10 Meters and 80 Meters Scramble Control FREQ's are Rep 8 and 28.500
MHZ. So how about coming along and have some tun.

ATTENTION::! MEMBERS AND FRIENDS OF THE NORTH WESTERN BRANCH.