QRM
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Amateur
Radio DECEMBER 1985,
News
Issued by the Tasmanian Division of
the Wireless Institute of Australia
Radiotorial (omment.
Your Editor, having returned from U.K., has a few comments to make
which may serve as a warning of purchasing problems we may face in
the near future - if, in fact, we haven't come across them already.
The first concerns our ability to walk into shops and purchase
fairly large items over the counter. "Of course we can", you may
say, BUT if Australian conditions become the same as those of other
countries, this won't be so for much longer. Your Editor went into
three radio suppliers who adv ertise widely in the technical press,
and have branches in different parts of U.K. All he wanted was to
buy a Daiwa CN620A SWR/power meter. "Certainly, sir. We'll order
one for you at once. It will toke about two or three weeks'".
Having protested that there was one in the glass cabinet, your
Editor was told, "Ah, but that's our display model - it's the only
one we have, so you can't have that one". Now, it may sound quite
hilarious, but it happened again, when trying to purchase adouble
B et
electric cooking ring, AND again, with a refrigerator supplier.
It seems that shops are becoming merely showrooms - orders are
taken, and when enough items have been "put on the books", a bulk
order goes in. The second problem is that, in some cases, payment
in advance is required, too - a nice little "extra" to have YOUR
money in THEIR bank for a few weeks, with interest.
We already meet this situation in Tassie, in that some shops
will order an item "from the mainland", and it takes two or three
weeks to arrive. We know perfectly well that overnight air freight
is possible in most cases - so what do we do? We bypass our own
shops and order direct, even by phone and credit card! The U.K.
suppliers said it didn't pay them to have large stocks of expensive
goods on their shelves "because it was all dead money". Very
frustrating for the buyer with his money ready and waiting. What
do you think?
73 NTERNATIONAL
espondent,
Jim, the Australian "73 International" corr
Once again,
to "QRM", has turned up
and even more famous as a contributor
publication. We give
trumps with an article on VK7 in the American
dgments to Jim
below a reprint of that arti cle, with due acknowle
and "73". ———————————————————————————————————————
e
Each month, 73 brings you or to 73 Magazine, Pine Street,
news in DX, contests, and events, If you would like to contribute
ham-radio news from around the as well as keep you abreast of o your country’s column, write Peterborough NH 03458, USA,
Attn: International Editor.
world. In this collection of re- the technical achievements of o your country’s correspondent
ports from our foreign correspon- hams in other countries.
dents, we present the |atest A
S——————————————
A
——
VK7—TASMANIA Repeaters
They had, for instance, a reenactment “The Tasmanian Branch of the Telecom
Tasmania, like most of the early settle- Tasmanla, being very mountainous
of the first spark transmission and talks Technicians' Union (ATEA) has decided to
ments In Australia, started out basically compared with the rest of Australla, has, by VK7AW on computer-aided design of honour Max's name and the memory of all
as a prison colony. The prisonsettiement over its small area, four repeaters on 2-me- loaded dipoles and vertical antennas. those people who have been engaged, by
of Port Arthur on the southernmast point ter FM and four on 70 cm, and it I8 not un- VK7ZPK gave a lecture on tracking ama- vocation or pastime, in the pioneer days of
of Tasmania was the furthest that the En- usual for the VK7 operators to access the teur satellites by computer, while VK7ZAR communications. The endeavours of these
glish could send their prisoners, using the VK3 or VK5 2-meter repeaters across the talked about setting up a satellite sta- ploneers have brought us to the current state
old adage, “out of sight, out of mind,” ap- 300 to 500 miles of ocean between us. Di- tion—ine equipment feduired and hiwd {Q of the art which we now all enjoy.”
parently. rect contact on 2-meter SSB is also quite work same. “it is intended that a collection of valve-
The very few who did survive the trip out common, without large beams of power. There was a large amount of home-brew era equipment will be gradually assem-
plus the harshness of the penal system To highlight this, the following appeared gear; the best crafted of thisequipment bled, restored o working order, and made
found a gem of an island in the southern In “QRM" (the Tasmanian Division of the was entered for the Max Loveless award avallable for public display. Hopefully, the
the
ocean that even today, because of its rug- WIA's newsletter), It is reprinted with (see below). whole collection will be able to be eventu-
ged grandeur, has not been fully explored. permission of editor John VK7JK. Department of Communications repre- ally placed In a permanent formal mu-
Tasmania, these days, is the main port FRUSTRATION SECTION sentatives were In attendance with all seum environment, maybe through the co~
of call for fuel and provisions for all those With great aspirations for some experi- their technical expertise, plus state-of-the- operative efforts of established authori-
multinational fishing fleets that fish the mental DX operating, Alan VK7ZAR and art test equipment, to test (free of charge) ties in the area. It is not intended that this
southern ocean; it also is the main refur- Greg VK7KJ set out at the start of a week- any amateur's equipment as to its transmis- collection should compete in any way with
bishing port for our VK@ stations in Ant- end in early January (at the height of sum- sion or reception specitications. If either was existing endeavors by other public or pri-
arctica. It Is one of the main apple and men) and headed off in the direction of Ben found lacking, friendly advice was given asto vate initiatives, rather, we would see our
potato suppliers to the mainland. That is Lomond, 5,000 feet up. They were carrying the best way o soive the problem. efforts as being complementary to exist-
why we call it "“The Apple Isle.” a load of equipment covering from 6 me- in all, a very successfui convention, fin- ing endeavours by both public and private
ters to 1296 MHz and had set up HF links Ished off with a gala dinner at the Hobar collectors. We think the preservation of
The Tasmanian Devil prior to their departure. But on their ar- Masonic Club. actual ‘communication’ equipment, as dis-
Tasmania is perhaps best known by DX rival, what did they find? It was blowing a tinct from telephone/exchange/telegraphy
Winnle the War Winner and domestic wireless, has been largely ne-
award hunters for its Tasmanian Devil's gale and temperatures were down to freez-
Award, which appears to be one of the Ing. Conditions, as Greg says, “were VKO"— Max Loveless VK7ML, a former State glected. We aim to assist in filling thatgap.”
most sought after pieces of walipaper visibility nil and, with those windspeeds, Councillor of the Tasmanian Division of Obviously, if the collection is to get under
available from “down under.” no antennas either! Mike VK7ZWW had the WIA, died In April, 1971. Max, as well way successfully, apparatus is required. In
The Tasmanian Devil itself is well de- the key to the ski lodge, but where was as being an active amateur, spent a life- particular, the following items are eagerly
picted in those Walit Disney cartoons as a he?? David VK7ZOT was a 1296 contact, time in “real” wireless communications. sought (some limited funds are available for
whirlwind of ferocious teeth, with a sour but later on Saturday morning they had to He played with the newfangled gadgetry the purchase of such equipment):
disposition. It is said that they can be cancel everything. To cap this story, on of the early 30s, worked for the ABC in « Old ex-service gear; in particular, we
tamed by feeding them with hand-held Saturday evening, Andy VK7ZAY in Ho- Hobart prior to World War Il and spent would like to get hoid of an R101 or an
pleces of chocolate—If you are not fright- bart, heard a ZL calling on 144.1 SSB!! time in the AIF on Timor during the early R109 set (these were actually in use on Ti-
ened of losing your hand, of course! After travelling 600 km for nothing, that dark days of that conflict. mor and would be fundamental to the col-
There are approximately 500 licensed really was the end. It was there that he built “Winnie the lection), no.22, no.19, HRO, ARS8,ATS,
amateurs within Tasmania. Of these, only Greg VK7KJ. War Winner," the radio transmitter con- ARS8, 828, B4C, and similar apparatus.
150 would be active on HF, so the latest structed on kerosene tins and bullt upof » Home-brew apparatusof all types whichmay
VK7RY's SOUND ADVICE
QSL card figures | have for 1984 of around recovered domestic radio equipment, cap- have been discarded in interveningyears.
11,015 Inwards, and 7,672 outwards is It she wants a date—METER... If she
tured Japanese apparatus, and the re- Should you feel able to assist us in this
equal 10 51 cards each, outwards, so ex- wants an escort—CONDUCTOR. .. If she mains of a low-power Australian wireless most worthwhile venture, please contact
cept for a few keen DX operators, they are wants chocolate—FEEDER. .. If she's a set. Until the successful contact with Dar- me by telephone in Hobart, 002 268 351, of
not very active. This makes the above poor cook—DISCHARGER. .. If she eats win on this apparatus, using a Morse key perhaps write to: Barry Riseley, Branch
award a little harder to get, but it is well too much—REDUCER... If she is made from bamboo(!), the 200-0dd Austra- Secretary, ATEA, GPO Box 215¢, Hobart,
worth the extra effort. wrong—RECTIFIER. .. If her views are too lian Army personnel who had been feft on Tesmanla, Australla.
narrow—AMPLIFIER. . If she wants too Timor were thought to be either kilied or
Broadcasts much—RESISTOR. .. If she wants to POW. They had lived off the land for a
There is a local Sunday WIA news marry you—ELIMINATOR. .. if she's a number of months and kept 15,000 Japa-
broadcast on 7.130 MHz (or Saturday at heathen—CONVERTOR. .. If she comes
nese troops occupied, who could other-
2330 UTC) for those stations wanting to to your home—RECEIVER. .. if she is wise have been moving Into northwest
check band conditions or get more Tassie missing—DETECTOR... If she won't go Australia. “Winnie" is now preserved in
Devil contacts. There also is a net running away—TRANSMITTER. .. If her stays are the Australian War Museum in Canberra.
for the Sunday broadcast info on Saturday too tight—LOOSE COUPLER... If she's
at 0830 UTC on 3.570 that is worth checking. too fat—WOBBULATOR. Ploneer Memorial Coliection
RTTY VK7 Conventlon
Not many amateurs have the honor of BYag i
an award (or, In this case, a collection)
RTTY activity from the north coast of In June, a special convention was held AUSTRALIA
named after them, but the Max Loveless
Tasmania has increased lately, courtesy to help celebrate the WIA’s 75th birthday. Pioneer Memorial Collection was created J. E. Joyce VK3YJ
of VK7TNW. The main operating time is This convention was held in the Montrose by the Tasmanian Branch of theTelecom 44 Wren Street
1000 UTC on 3.625 MHz. For those inter- Bay Yacht Club overlooking thebeautiful Technicians' Union (ATEA) to honor a per- Altoria 3018
ested In RTTY, other UTC broadcast times Derwent River. It was special because son who used his skills in amateur radio Victorla
from VK2are : never before had there been so many and Aystralia
s gathered "' only to help otherotamateurs but also
3845 0830 Masies (Horst) so diverse events and exhibitor
. his country In a time need. The follow-
7.045 0030 VK20PM (Alan) in one place in Tasmania e
(Rod) ing s an excerpt from their impressive
14,085 0030 VK2DAY promotional literature:
(Joe)
ey
21.085 0130 VK2AJP
please note that thg
Would all aspiring contributors to "QRM" ry issue.
closing date for copy is Friday, 31st. January for the Februa
SO NOW YOU KNOW:
Remembering the fun and games we had with interpreting the values
printed on capacitors when doing some recent mods to 6m. gear, we
thought the table given below might make a useful permanent reference
chart for the Activity Groups and ail homebrew merchants.
CAPACITOR CODE
: CODE : pF : nF : ufF :
: 199 : 19 : : :
: 159 : 1S B NOTE: Some makers omit the :
: 2290 22 : zero(@)from the code. - @
: 339 : 33 : : :
: 4749 : 47 : : :
: 4890 68 : : :
: 191 : 199 : g9.19 : :
151 : 159 : g.15 : :
: 221 : 229 : g9.22 : :
: 331 : 339 : g.33 :
: 471 : a7g : g.47 : :
: 4681 &89 : g.6&8 :
162 : 19084 : 1.9 : a9.9910 :
: 182 : 1599 : 1.5 : g.9015 :
: 222 : 2209 : 2.2 : 9.9822 :
: 332 : 2399 : z.3 : g9.8333 :
472 : 473 4.7 : 9.8947 :
482 : L5299 &£.8 : 3.0968 :
193 190909 : 19 : 3.919 :
: 153 : : 15 : g.915 :
: 223 : : 22 : 3.922 :
: 333 : : 33 : g.933 :
: 473 : : 47 : 2.9847 :
. 683 . : 68 . 3.d68 :
: 194 : : 109 : 3.10
: 1549 : : 159 : g.15 :
: 224 : : 229 : g.22 :
: 334 : : 339 : g.33 :
: 474 : : 47 : g.47 :
. &84 . . &89 . gd.68
195 : : 1.9 :
155 : : : 1.5 :
: 225 : : : 2.2 :
33S : : : 3.3 :
: 47S : : : 4.7 :
&85 : : 6.8 :
Copies of this newsletter will be distributed to WIA members
at Branch meetings, and to other interested subscribers by post
at purely nominal cost. Anyone who wishes to take up this offer
should contact the Editor on 002.293402.
A SLIM JIM EMERGENCY PORTABLE ANTENNA.
All dimensions are in millimetres.
'A'-'B' is the feed point.
Inner conductor to 'A', outer shield to 'B' - slide
for correct match.
No ground plane required. The bottom end is 'cold'
and may be bolted to a support, or the antenns may be
suspended by a nylon line from the top.
All good WICEN operators should carry one in the boot of the car
for emergency use.
Southern Branch Venue.
For the benefit of possible visitors from other parts of the State,
we would like to remind you that the Southern Branch venue is now
at the Elizabeth Matriculation College, Elizabeth Street Hobart.
The College is at the corner of Warwick Street and parking is
available:. The time - 8.15 p.m. - and the date - 1st. Wednesday
in the month remain as before. All interested in amateur radio
are welcome to attend.
TASMANIAN DIVISIONAL COUNCIL.
Nomination Form for VK7 Council
L nominate......oiiiiiiiinnnnn.. Callsign....... .
for a position on the VK7 Council for the year 1986.
Proposer.....uv.eiiiiieneneennenn., Callsign..............
Seconder. i ittt
e Callsign..............
I, the proposed, hereby accept the nomination for the above
position.
To be forwarded to P.0. Box 1010, Launceston, Tasmania, 7250.
?uletide Barbecue.
December 15th is the date. Everyone is welcome. B.Y.0. food
and drinks. Those who own their own barbecue equipment - please
bring your gear along too. The venue will be announced at the
Southern Branch meeting and on the Sunday morning broadcasts on
8th and 15th December. Anyone who says he doesn't know about it
after all that, can't be really interested!
REPEATER COMMITTEE.
The Committee has met a couple of times and new repeater
proposals have been evolved. In fact, it seems that plans for
uprating Repeater 2 are really on the boil. Details will be
published in the next issue of "QRM" due out in February 1986.
So far, the proposals seem to be extremely cost effective, and
yet should result in the equipment being good enough to see us
through into the 21st century. Further meetings are to be held
in the near future and support is requested from all users of
the repeater, whether WIA members or not. Keep your eyes and
ears open for dates and times, and in the meantime, prepare
YOUR ideas and submissions.
Antony VK7ZTA.
BROADCAST ORGANISATION.
The September Editorial of "QRM" (q.v.) has apparently lit a
fuse - or perhaps it was just that, at last, someone has realised
that our broadcasting problems have reached a crisis point. The
information below was taken from the Sunday morning broadcast of
December 1st, courtesy of Barry VK/RS.
The Divisional Secretary has written to the three Branch
Secretaries reporting exhaustive discussions at Divisional
Council, as a result of which a sub-committee is to be formed
to report to the 1986 WIA AGM. Its job will be to provide a firm
basis for the continuation of WIA broadcasts in the best possible
way. Each Branch is requested to carry out urgent consideration
of present formats of the weekly broadcasts and to appoint a
representative group of at least 6 people to form the core of the
broadcast effort im the area. They will be delegates to the
Broadcast Summit Meeting to be held 14 days prior to the State AGM.
Written submissions by those interested would be of great value
to the sub-committee. 21st. December is the deadline for the
presentation of names for this group. Meeting dates will be
advertised in the weekly broadcasts and the venue will probably
be either Campbelltown or Deloraine. The outcome of these meetings
will control the future of WIA broadcasts, so they should be
treated as significantly urgent. Many organisations would give
a great deal to have 30 minutes free air time per week in order
to publicise their activities. Should we not think in the same
way? We need to communicate - after all, that's what amateur radio
is all about. Peter, VK7ZPK will set up the meetings as the
Divisional Broadcast Co-ordinator.
The G5RV Aerial — Some Notes on Theory and Operation
By LOUIS VARNEY, A.M.LE.E., A.LL., G5RV*
HE GS5RV aerial is a multi-band dipole specifically open wire feeder construction (preferred because of lower
designed with dimensions which allow it to be installed losses, especially at 21 and 28 Mc/s) its length should be 34 ft.
in most normal-sized back gardens, permitting effective (17 ft. for the half size version) but if 300 ohm ribbon is
operation from 1-8 to 30 Mc/s. As it does not make use of used, allowance must be made for the velocity factor of this
traps or ferrite beads, the ** dipole ' portion becomes pro- type of twinlead. Since this is approximately 0-88, the actual
gressively longer in electrical length with increasing fre- physical length of the 300 ohm ribbon stub should be 29 ft.
quency. Thiseffect confers certain advantages over a normal 6 in. It should be borne in mind that this matching stub is
or trap dipole because, with increasing electrical length, the intended to resonate as a half-wave impedance transformer
major lobes of the vertical radiation pattern tend to be at 14 Mc/s, which was chosen as the design centre frequency
lowered as frequency is increased. Thus, from‘ 7 Mc/s up, for the G5RV aerial, thus giving a very good impedance
most of the energy radiated in the vertical plane is at an angle match for a 75 to 100 ohm twin-lead or coaxial cable
suitable for DX working. Furthermore, the horizontal polar connected to the base of the stub.
diagram changes with jncrease of frequency from a more or If desired, due to lack of sufficient space to accommodate
less typical A/2 horizontal dipole diagram to that of a typical the 102 ft. long flat top, the ends of the aerial may be dropped
“long wire " aerial at 14, 21 and 28 Mc/s. vertically (or semi-vertically) for up to 10 ft. at each end, thus
Although the impedance matching of a suitable (non- reducing the overall length to 82 ft.
critical) length of 75 ohm twin feeder (preferred) or 75 to 80 An alternative arrangement to that of the matching stub
ohm coaxial feeder from the base of the matching stub to the and twin-lead or coaxial cable feeder is to use an 83 ft. length
transmitter or, preferably, to a suitable aerial tuning unit, is of open-wire feeder measured from the centre of the flat top
to the terminals of the a.t.u. This arrangement permits
parallel tuning of the a.t.u. on all bands from 3-5 to 28 Mc/s
je—51"- 0"y je—51'"-0"—»] with very low feeder losses.
The spacing of either the open-wire stub or the 83 ft. long
open wire feeder is not critical and may conveniently be
MATCHING STUB anything from 2 to 6 in., using either 14 or 16 s.w.g. copper
#34-0" OPEN WIRE FEEDER wire. Although the use of 14 s.w.g. is recommended for the
OR 29'-6" OF 3000 RIBBON flat top, 16 s.w.g. is adequate for the matching stub or tuned
feeder and is easier to * hang ” neatly.
TO TRANSMITTER VIA It is recommended that attention be paid to making a
AERIAL TUNING UNIT sound mechanical job of the construction of the aerial. In
/ particular, if 300 ohm ribbon is used for the matching stub,
ANY LENGTH OF 750 TWIN LEAD (UP TO MAXIMUM the ribbon should be looped over the centre insulator of the
OF APPROX IOOFT) OR 800 COAX flat-top and secured with nylon thread or plastic tape, leaving
Fig. I. Dimensions of the full-size G5RV Aerial. For the half-size
*“flying ”* ends about 9 in. long forming two loops for con-
version, the dimensions of the flat-top and matching stub are scaled nection to each half of the aerial. This type of construction
proportionately. avoids breaking of the ribbon due to swinging and vibration
in high winds. Alternatively, a suitable triangular shaped
approximate only for most bands, a very good match indeed ceramic or plastic dipole centre insulator which is designed
is obtained on 14 Mc/s. It so happens also that the polar to secure the 300 ohm ribbon may be used.
diagram on this band is that of a three half-wavelength long- Although it may be very convenient to use a length of, say,
wire which is particularly suitable for all-round DX working up to 100 ft. of coax direct from the transmitter to the base
and gives an estimated gain of about 3db over a simple dipole of the matching stub, it must be remembered that such an
in the directions of the four major lobes. arrangement will tend to produce currents which will flow in
The above reasoning does not apply toits use on -8 Mc/s the outer conductor of the coax, causing unwanted radiation
where it functions as a Marconi or T aerial with most of the from the coaxial feeder. This may be avoided by the use of
effective radiation taking place from the vertical or near- either 75 ohm twin-lead and a suitable a.t.u. or the open-
vertical portions of the system, the * flat top ™ acting as a wire feeder and a.t.u. as already mentioned. However, the
top-capacity loading element. However, with the trans- use of a suitable wide-band balun as suggested in the article
mitter end of the feeder strapped and with the system tuned by G3HZP in the July, 1966, RSGB BuLLETIN would be
to resonance with a suitable series inductance and capacitor preferable if coaxial cable is to be used. Nevertheless, in
circuit connected to a good earth, or a counterpoise, very practice very satisfactory operation can be achieved by the
effective radiation on this band is obtainable even when the simple use of co-ax direct from the transmitter to the base of
flat top is as low as 25 ft. above ground. the matching stub even though the v.s.w.r. may reach 10 to 1
or more on 3-5 Mc/s. This figure may be reduced to about
Construction 5to 1 on 3:5 Mc/s by *“ pruning the co-ax. On the higher
The dimensions of the aerial and matching stub are as frequency bands the v.s.w.r. on the co-ax lies between 5 to 1
shown in Fig. 1. It should be noted that it is quite in order to and 15 to I, the latter figure applying to 14 Mc/s where, as
" bend ** the lower half of the matching stubif desired owing explained above, the matching is very good.
to relatively low height above ground of the flat top. The Contrary to general belief, a v.s.w.r. of up to Sto | on a
writer has used this aerial for many years at a height of only length of co-ax up to about 100 ft., at the frequencies con-
25 ft. with excellent results on ali bands from 18 to 28 Mcfs. sidered here, results in negligible loss of power. However,
A word about the matching stub is in order. If this is of this is not to say that it is not better to keep the v.s.w.r.
figure as low as possible, especially where a low-pass TVI
*Member of Council, 184 Galleywood Road, Chelmsford, Essex. filter is to be used. -
RSGB BULLETIN
SO_YOU WANT TO CONTACT THE EDITOR?
His name is John Rogers. His callsign is VK7JK. His telep
hone
number is 002.293402. His address is:
1, Darville Court,
Blackman's Bay
HOBART, 7152.
And when you lose your copy of "QRM" remember he's QTHR.
When he
is at home, his IC21A is normally running and listening to
Repeater 2.
FEDERAL REPORT, via VK30OM.
VK3KT, Brenda Edmunds, the Federal Education Officer reports
that a Committee has been set up for a Study Guide for the revised
Novice Syllabus. The study is to demonstrate the depth of each
topic, to be useful to instructors and to those trainees who are
unable to get to classes.
The Committee are still unaware of many recommended texts.
They would appreciate information on any easily available
publications, favourite books, pamphlets, articles etc. which
would help in this sphere.
The revised syllabus is now available from Brenda or DoC State
Offices, in leaflet form. There are not many dctual content
changes, and so far no date has been given for it to come into
effect.
The next step is to prepare a similar guide for the Full Call
Syllabus, so those who feel they have been left out of the Novice
Guide discussions can now have their say. As soon as leaflets are
printed, Brenda will be pleased to send them for members to work on.
Education Officers have copies in each Division already.
Perhaps each Branch could spend one meeting night on one section
of the syllabus, suggests Brenda. (Maybe our Activity Groups could
take up this proposal ond present some ideas to Branch meetings on
Row far_each topic should be developed). It is more important to
show the degree of detail of knowledge that would be unacceptable
for an exam question. It is hoped that these guides will be a
prescription for the examiners as much as those taking the tests.
When a point of mutual agreement has been reached between WIA and
DoC, the guides will be printed and made available. The Novice one
should be ready for courses starting in 1986. Full Call Guides
are at least six months away unless massive input from interested
parties speeds up production.
AMATEUR ADVERTISEMENTS.
DoC have no objection to these continuing on the amateur
broadcasts. They are seen as a necessary adjunct to the hobby,
and enable experimenters to acquire equipment to further their
knowledge and skills. However, there is now a DoC requirement
that these small ads should be co-ordinated through one responsible
Officer in each Division, and that entails recording them in
writing. They must be non-commercial and of relevance only to
amateur radio. Prices may be included, provided the equipment
being advertised is bona fide amateur gear. An advertisement
application form will be included in the next edition of "QRM".
NORTHWEST BRANCH ROSTER for DECEMBRER 1985 BROADCASTS.
The following is the Broadcast Roster for Relay Stations of the
W.I.A. Tasmanian Division News Broadcast Station VK7WI for the
month of December:
Date 40m. 2m.(Repr.3) ATV (7RTV)
1st. Dec. 70L 7WN 7AX
8th. Dec. 7WJ 7WZ 7AX
15th.Dec. 70L 7WN 7AX
22nd.Dec. 7WJ 7WZ 7AX
29th.Dec. 70L 7WN 7AX
NOTE: Where swaps or changes are necessary, please advise Tony 7AX.
NORTHWEST BRANCH NEWS.
Amateur Television News.
Viewers in the Easterly and Northern directions
from the ATV Repeater VK/RTV should notice a marked improvement in
the received signal strength from the repeater.
A change in the orientation of the transmit antennae has
resulted in o 6dB improvement in the signal being received in these
directions.
Jack 7WJ reports reception of excellent colour pictures with
little noise at his QTH in Devonport.
Further improvements to the efficiency of the transmit antennae
of the repeater are expected when the weather returns to more
favourable conditions.
Work is still progressing with the construction of the second
ATV repeater VK/RAE. Testing will commence in the very near future.
Branch News.
Penguin High School is the venue for the normal monthly
meeting of the Branch. The November meeting was addressed by Mr.
Bevis Dutton from the S.E.S. N/West Regional H.Q. at Burnie.
The Annual Meeting of the Branch is the main item on the
agenda for December and it is hoped that serious consideration is
being given to filling the many spare positions that are up for
election.
The 1985/6 Australian Radio Amateur Callbook is now available
and Branch Secretary Tony (VK7AH) is currently taking orders for
same.
Another order will soon be placed for more W.I.A. clothing etc.
Interested persons should also advise Tony of their requirements
at the conclusion of the meeting.
THE EDITOR SENDS CHRISTMAS GREETINGS AND BEST WISHES FOR THE NEW YEAR
TO ALL THE AMATEUR RADIO FAMILY AND THEIR FAMILIES. MAY YOUR
CHRISTMAS BRING GOOD CHEER AND 1986 BRING SUCCESS AND PEACE.
P
8062A
® Stable 4!4-digit (20,000 count) resolution
® 0.05% basic dc accuracy
@ True-rms ac voltages to 30 kHz
® Fast audible and/ or visual continuity tests
® Relative reference (offset)
® Low-power ohms on all resistance ranges
® Constant-current diode test mode
® Measures resistances to 300 M)
® Self diagnostics
® |-year warranty and calibration cycle
Because the 8062A has several unique
modes, several special annunciator symbols
may appear in the LCD readout. For
S e N example REL will appear when the relative
e
[ e /...’.\ = ]
-+ -
reference button has been pushed — a
T helpful reminder to any operator. The
300 M) top resistance range in the 8062A is
fifteen times higher than the usual 20 M(Q.
8062A To keep the front panel simple, there is only
one manually-selectable position above
The 8060A and 8062A reciprocal of period measurements to 200 k. When that position is used, the
indicate frequency, and display only the appropriate 2 M(, 20 M(}, or 300 M range
4'/>-digit true-rms DMMs difference between a stored reference value is automatically selected.
These two 4l4-digit handheld DMM’s offer and a measured value. Three self-test
There are fiveacand dc voltage ranges on the
far more measurement capabilities than diagnostic routines are built in. One test
8062A from 200 mV to 1000V for dc, to 750V
found in most bench/portable DMM’s. occurs each time the power switch is turned
for ac. Resolution is 10 uV on the 200 mV
They are Fluke’s first microcomputer-based on.
range. True-rms ac accuracy is specified to
handheld DMM’s and consequently offer
The 8060A and 8062A are exceptionally 30 kHz. Basic ac accuracy is 0.5%
unique and valuable features never before
well-suited to the needs of engineers,
found in a small low-cost DM M. The 8060A There are four ac and dc current ranges on
technicians, and hobbyists skilled in audio,
even measures frequency — from 12 Hz to the 8062A from 20 mA to 2A. Resolution is
video, telecommunication, or computer
more than 200 kHz — autoranging over four 10 nA on the 20 mA range.
technology. They are designed using the
decades from 200 Hz to 200 kHz.
same rugged case and safety engineered
The microcomputer lets you automatically jacks, test leads, and double-fused current
8060A
do such things as subtract lead resistance inputs found on other Fluke handheld o All the features of the 8062A, plus
when measuring ohms, convert voltage to dB DMM'’s. And the same extensive overload ® Frequency... 12 Hz to 200 kHz
or dBm, average each set of updated protection is built in for the other functions ® True-rms ac voltages to 100 kHz
measurements to reduce noise, take the and ranges. ® (0.04% basic dc accuracy
® (.29 basic ac accuracy
® dBm or relative dB measurements
® Conductance measurements
It is easy to accurately measure the dB gain
or loss of amplifiers, filters, attenuators, etc.
with a DMM that has dB readout. To
REL With the 8060A,
combine that feature in a handheld DMM
frequency, decibels,
that also measures frequency provides a
continuity, or relative
nearly ideal test instrument for many
reference mode is
applications. LCD annunciators appear in
selected with one of
the display when the dB or Hz pushbuttons
Sfour pushbuttons. The
are used to select one of those modes.
choice is indicated in
the display.
GEORGE HARVEY ELECTRIC
76, York t., 162-4, Argyle
1
Launhcesto . 7250 Hobart, 7000.
“\'f‘.:fi‘ (“Jzz’*’f
003.3165