QRM
Recognised text
Text below was produced by optical character recognition and may contain errors. Check it against the original.
Amateur
Redio
News APril 1935
Issued by the Tosmanian Division of
the Wireless Ins*titute of Australic
V%%)/ 7@%/&7//%/ 7/8{47'/// "%fifi/?flfl«&)@@
WIRELESS INSTITUTE of AUSTRALIA
TASMANIAN DIVISION
PRE” YTDENT'S REPORT 19895
Ladies and Gentl+rwen,
It is with pleasure that I present to you the annual report of the
Wireless Instituvte of Australia, Tasmanian Division, for 1984.
Divisional Col 11 this year had two Councillors each from the South
and North-We:'. ne from the North and an ex-officio member as
secretary. |
M- = were held in members' homes in Launceston.
Attens w-—~es o - ., the year were satisfactory, although the freguency
of mee'?ngs “tAaL.f be given consideration by next year's council.
The past yer~ again ' - seen Council adopting the the role of
co-ordinator betw u % .~es with the main activities being
controlled -irom t.faiii
2 - Branches.
Tnis was seirlig (et by Search and Reescue Exercise conducted by the
Tasmania Police + tat. Fiergency Services over the 27th/28th
October 1934 in tne ' z! Rowallan - Walls of Terusalem area in which
WICEN was invited to jsarticipate. The Northern Rranch beir;. assigned
to co-aord:.yate the North-West and South for the supply of ; ersonnel
and equipment. The uxercise was highly successful in democnstrating
the capabilitien and _.seful ness of the Amateur adio Servire. The
three Branches benefitwed greatl, from this ex2r’ se.
March 1984 sz4y th- reintroouztion of GFM under the editorship of Jahn
Rogers, distributiun presercly -ia Braach mecztings. Sunday merning
broadcasts hi-'e been brouztht to you e -h weel, 'y a few dedicated
amateurs,; who originate and relay onto frequencies for ali classes
licencees to list=n statewide, however .ot wWwitnout some difficulties
during the yeat Tis is an «rea which 'ejuires the attenticn o~
Council.
The Tasmania Award has continued in pcpularity and is well
sought afte T — %L Bur-.au shows 1 reducticn in the number o4 Cards
being hand d ..\ ‘2,687 rds be.no .a2ndlied for the year. & clear
indicatio f r.re®2at ban. Yomdition..
Divisional finances during the year have shown an increase, brou¢t
about by keeping expenses to a minimum, increased membership and
renewals of lapsed membership.
During this last year we saw the introduction of the Max Loveless
Pioneer Memorial Collection by the Tasmanian Branch of the Australian
Telecommunications Employees Association and has been endorsed by the
Wireless Institute of Australia, Tasmanian Division, in its
endeavours to provide a permanent memorial to the pioneers of
wireless in Australia.
Finally, to all elected and ex-officio members of Council, I thankyou
for your support and co-operation during the past year.
Peter C. King VK7ZPK
Divisional President
Radiotorial Comment
Our 75th Anniversary preparations have tempted several people
to polish up the crystal ball and look ahead for the next 25 years.
Some notes by Don Field G3XTT in "A.R." (U.K.) seemed to fill the
bill, so here are some extracts to set you thinking.
“When amateurs first started to explore the HF bands, they found
themselves doing valuable pioneering work, and they st' 1l demonstrate
innovation. There was their adoption of SSB on HF durirg the 50's
and 60's, a path followed later by the professionals. However, many
now believe that the only pioneering work now being done by amateurs
is in the microwave part of the spectrum. Certainly the profession-
als are very advanced in their use of HF, while we seek to preserve
the status quo of about 20 years ago. Our contests are based on
SSB and CW operations, our techniques are no more efficient in their
use of the spectrum than they were then and our ability to raise a
specific station other than by pre-arranged schedule is still largely
a matter of chance. None of this need be so. Amateurs on VHF are
are experimenting with selective calling and packet radio which
enable messages to be sent to pre-determined stations even when
the distant operator is absent or otherwise engaged. Potentially,
our HF bands could be used as the "trunk" element of a world-wide
packet-switched data network, with the VHF bands forming the local
end. Improved propagation forecasting would permit reliable
messaging between radio amateurs throughout the world. Increasing
sophistication should not difenfranchise up-and-coming amateurs in
the third world, so CW must continue to have a place - also, of
course, for those nearer home who cannot afford the lat:st in
microprocessor controlled creations. We English speal . amateurs
often forget that those in mony other countries have - overcome a
language barrier, and CW can help a great deul in thais.
(conb.)
So, what sort of scenario do you envisage for HF amateur radio
in the year 2010? Will it be as now, but with more RTTY, given
the increasing use of micros by amateurs? Will HF have developed
along the lines mentioned above, or will it be dead, replaced by
a worldwide VHF network based on geostationary satellites acting
as telephone exchanges in the sky?"
Quite o thought, isn't it?
// VK7 JK.
FOR SALE.
MUIRHEAD variable air condenser, 1000 pF Type A-430-BMS.
Offers invited to Harry VK7CZ. QTHR.
WANTED
.
Linear Amplifier to suit 70cm. handheld. VK7CV.
Ring QTHR or call on Repeater 2.
WANTED
.
Communications Receiver, FRG7 or similar. Contact VK7JK. QTHR.
PUZZLE CORNER.
Dear Editor John,
It is extraordinary how hard you work .... trying
to get contributions (for QRM). Sorry I can't give you a technical
contribution .... but having solved your little geometry problem
in December QRM, I can offer you another little teaser. It is
called "The Monkey Puzzle", and, as you can see, there is nothing
to it, so get busy:
The Monkey Puzzle.
A rope passed over a pulley, having a monkey at one end and a
weight at the other, and the whole remained in equilibrium with
the same amount of rope on each side of the pulley. The rope
weighed four ounces per foot and the age of the monkey and the
monkey's mother together was four years, and the weight of the
monkey was as many pounds as the monkey's mother was years old,
and the monkey's mother was twice as old as the monkey was when
the monkey's mother was half as old as the monkey will be when the
monkey is three times as old as the monkey's mother was when the
monkey's mother was three times as old as the monkey, and the
weight of the weight and the weight of the rope was half as much
again as the difference between the weight of the weight and the
weight of the weight plus the weight of the monkey. What was the
length of tne rope???
73's from Bill VK7WL.
DEPARTMENT OF ANTENNAS.
Many Tasmanians and North Island Amateurs have shown interest
in, and asked questions about, the 2m. antenna used by me, VK7CV
to bounce signals off Mt. Wellington into Repeaters 8 and 6.
This article may help someone to improve their 2m. band range.
It is not a new design, but an existing one modified to suit local
terrain and conditions.
The construction of the antenna is not difficult, BUT
infinite care must be taken with the placing of the driven
elements and the phasing, or the resulting reactive force will
become unmanageable.
The Log Periodic Yagi for 2m. as used by VK7CV.
The design and dimensions were adapted by VK7ZAR from the
1016 original by ZLI1TFE.
%9 8 Element lengths all in mm.
213 187 Qo2 895 %95 895 893 83
Spar.'mqall
Six directors
Cenlkre Yo centre
Four driven
elements
n mm.
10rmm
{ x
X TMbe
45m
each
side
of
centre
Con
....
t
Phasing wiring must follow this layout exactly.
Cover 3mm. soft aluminium wire with PVC tubing. Wire length
should be 1448 mm. exactly. (Wire available from Tandy.)
All screws, nuts, washers, etc., should be stainless steel and
are available from Peter Johnson P/L.
The aluminium tube was purchased from Moonraoker, the insulators
from VK7ZIF, who can also supply a suitable balun.
NOTE: The antenna should be mounted vertical on a wooden post.
e ee
A DIP OSCILLATOR FOR HF AND VHF.
This article was taken from an earlier issue of QRM (March 1978)
and reprinted from Eastern Zone News, by Ray Price, VK3AWQ. It is
printed in line with the QRM policy - and that of the activity
centre now being set up in Newtown Road, Hobart - of including as
much homebrew test equipment as we can find.
The writer had on many occasions built up GDO's from circuits
given in various magazines, only to find that either they wouldn't
oscillate at VHF, or they were so full of false dips as to be
virtually unuseable. The following circuit seems to behave itself
on all frequencies. It's not original, rather a modification of
other circuits, but it works well for me. Let's hope it does the
same for you.
A:I'P F
S1 - on/off switch.
D1 - any diode that works.=
I used an OC171 transistor as it was in the junk box, but a
AF114,5 or 6 would do just as well. The coils are cut and try,
depending on the former and wire size. I used %" o.d. formers out
of an old transceiver, but hypodermic syringe bodies make beaut
formers. The 144 MHz coil is 2 turns wound on a 5/16 drill shank
with legs 1§" long. The 72MHz coil is 3 turns on a 7/16" drill
shank with legs 13" long. 18g wire was used. For the HF coils,
wind about 15 turns on a %" o.d. former with 26g. wire and listen
on your general coverage receiver. Once this coil is calibrated,
the rest is easy, either more or less turns depending on the
coverage required. A VU meter was used for M. Don't forget to
keep all leads as short as possible.
ekt e eA et R e e e e e R S
WOULD ALL ASPIRING CONTRIBUTORS TO "QRM" PLEASE NOTE THAT THE
EDITOR'S CLOSING DATE FOR THE MAY ISSUE IS FRIDAY, 26th. APRIL.
COMPUTER PROGRAMMES.
By Bob, VK7NAI
Have you ever been troubled by those awards where certification
is required by yourself and two other amateurs, and you can
never remember the proper wording? Here is a short programme
that may solve the problem. Written for the Vic 20, it should
work equally well on most other computers. One essential
requirement is, of course, a printer.
Lines 74@ 750 77% and 783 should be altered to combin your
own address.
1¢ OPEN3, 6
3¢ PRINT"s"
40 PRINT"NAME OF AWARD:":INPUTNAZ
5 PRINT"NAME OF CLUB:":INPUTCA¥
6@ PRINT"NAME OR CALL SIGN OF AWARDS MANAGER:":INPUTAWS
79 PRINT"POSTAL (STREET":INPUTPAZ
8¢ PRINT"CITY:":INPUTCIg
9@ PRINT"POSTCODE:":INPUT PO
95 CMD3
10 PRINT#3,NAZ:PRINT#3:PRINT#3, CA%:PRINT#3:PRINT#3, AWg :
PRINT#3, PAZ
11¢ PRINT#3,CIZ;PO
1200 PRINT#3:PRINT#3:PRINT#3
199 PRINT#3,"I CERTIFY THAT THE ATTACHED IS AN EXACT"
20 PRINT#3,"COPY OF MY STATION LOG."
3¢@ PRINT#3:PRINTHJ
4@ PRINT#3,"SIGNED:............ N VKZNAT"
450 PRINT«3
50@% PRINT#3,"DATE:.../.../...
6@ PRINT#3:PRINT#3:PRINT#3
610 PRINT#3,"WE HAVE EXAMINED THE LOG OF VK7NAI AND"
62¢ PRINT#3,"FOUND THAT THE EXTRACT ATTACHED HERETO"
63@ PRINT#3,"BE CORRECT AS PER HIS STATION LOG."
640 PRINT#3:PRINT#3
65@ PRINTH3, "SIONED et e r e et eeeeerereeenennnnns "
66@ PRINT#3
67@ PRINTES, "CALL vttt ittt teeeeeeeeennnnnn, "
68@ PRINT#3:PRINT#3:PRINT#3
69F PRINTH3, "SIGNED: . .o vttt e et eeeeteeennnnennn. "
70¢ PRINTu3
710 PRINTE3, "CALL .ttt ettteiiiiieneenns "
715 PRINT#3:PRINT#3:PRINT#3
72¢ PRINT#3,"QTH"
730 PRINT#3
749 PRINT«#3,"POSTAL: PO BOX 168"
75 PRINT#3 LAUNCESTON 725@"
760 PRINT#3
77¢ PRINT#3,"STATION: 14 KINROSS PLACE"
780 PRINT#3," INVERMAY 7248"
79¢ CLOSE3
READY.
ENDS
TWO
—_— TONE
= OSCILLA
oY ATV TOR, A
700 NZ
Hz and
and /U0
1700 Rz
Hz.
This circuit, stated to be very stable, was received from
Charlie, VK3ACR. The 1700 Hz and 700 Hz outlets are required
only if you really need separate outlets. Note that you will get
the same effect if you swing the balance control from one side
to the other.
The tab pots are for adjusting the outputs of each oscillator,
and I found the central position is just about right. They could,
in fact, be replaced by 250k resistors if you like, taking the
output for the balance control from the end farthest from earth.
Transistors: 2N706, BC108, 2N3566 or similar.
Capacitors: green caps.
SO YOU WANT TO CONTACT THE EDITOR?
His name is John Rogers. His callsign is VK7JK. His telephone
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, the 2m rig is normally running ond listening to
Repeater 2.
The 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 would wish to take up
this offer, please contact the Editor on 002.293402.
o
Sl
wOIOHO
The 75th Anniversary Hamfest
at the
Montrose Yacht Club, Hobart
JUNE 8th & %th
'‘Amateur Radio -
yesterday, today & tomorrow’
* RTTY. Display * Satellite Communications
* Home-brew Section x (.S.L. Card Display
* Video and Rudio Display
From History to High-Technology!
* Packet Radio * Amateur TV
* Social Event % Big Prizes Raffle
GIANT JUMBLE SALE SATURDAY ARVO -
SORT OUT YOUR GEAR NOW ! !
Come and Meet Fellow Amateurs!
Don’t forget to send in the booking form inside April AR.
AmATR Beioss
PRICE L1IST
ICOM
MODEL DESCRIPTIUN R.R.P.
POWER SUPPLIES (Cont'd)
IC PS25 BA Power Supply for IL 271A/IC 471A 189.00
IC PS30 System Power Supply 25AMP 375.00
IC PS35 Internal Power Supply for 751A/745A 258.00
IC PS45 System Power Supply BAMP 193.00
IC PSBS2 Wall Charger for IC2A/IC4E 15.00
ACCESSORIES
AG1 Mast Head Preamp For Use with 451/ 35.00
4SA/LTIA
AG 20 2m. Internal Preamp 25W, 271A 385.00
AG 25 2m. Mast Head Preamp, 100W/271H 112.00
AG 35 70cm. Mast Head Preamp 100/271H 128.00
AH 1 3.5-28MHz 5 Band Mobile Antenna 298.00
8C 16 Wall Charger for 8P7/BP8 18.00
BC 36 Orop in Rapid Charger BP2/8BP3/8P4/ 33.00
B8PS/BP7/8P8
B8P 2 425ma at 7.2v Nicad for IC2A/IC4E 55.50
BP 3 Nicad Pack .for IC2A/IC4E 36.00
BP 4 Alkeline Case for IC2A/IC4E 12.50
BP S 425ma at 10.8v Nicad for IC2A/IC4E 26.50
8P 7 High Capacity Battery Pack (13.5v) 115.00
Nicad for 02A/04E
BP 8 Nicad Pack (8.4v) for ICO2A/ICO4E 105.00
BP 10 " Internal Nicad Pack for IC 505 115.00
BU 1 MemoryBack Up Module for 280/25A/45SA 39.50
CA S 5/8 Telescopic Antenna for IC2A ) 24.00
CA 1200 S5/8 MBL Antenna for IC 120 126.00
CF 1 Cooling Fan for 701PS/PS20/PS15 40.50
with EX 144
CK 70 13.8v OC Cable Kit for R70/R7M 15.00
cP 1 Cigarette Lighter Pluy and Cord for 7.50
IC 2A/IC 4E
CP 10 Battery Pack Separation Cable for 35.00
02A/04AR/2A/LE
CR 64 High Stability PLL Ref XTAL for 114,00
IC 7S1/R71A
Cr 10 Computer Interface/Terminal Unit a949.00
(720A/R70/751/271A/G R/21TR/ 259N/
260R/551/0D/251A/651A/560)) OBTAINABLE FROM:
Hobby Electronics,
Optional Intecface Unit (B2 M05) 1 Fequired
for all models. 477 Nelson Roar, Mount Nelson,
Hobart, Tasmania.
Ph: (002) 23 6751.
4'/~-DIGIT HANDHELD DMMs
'062A
¢ Stable 415-digit (20,000 count) resolution
® ).05% basic dc accuracy
® True-rms ac voltages to 30 kHz
® [ ast audible and/ or visual continuity tests
® Kk :lative reference (offset)
® Low-power ohms on all resistance ranges
@ Constant-current diode test mode
® Meusures resistances to 300 M)
® Self diagnostics
® |-year warranty and calibration cycle
Because’ the 8062A has several unique
modes, s veral special annunciator symbols
may app ar in the LCD readout. For
L L TR
example } EL will appear when the relative
)
reference cutton has been pushed — a
helpful reminder to any operator. The
8062A 8060A 300 M top resistance range in the 8062A is
fifteen times higher than the usual 20 M.
The 8060A and 8062A reciprocal of period measurements to To keep the i ont panel simple, there is only
indicate frequency, and display only the one manuall -selectable position above
4'>-digit true-rms DMMs difference between a stored reference value 200 k. Whei that positior is used, the
These two 4l4-digit landheld DMM’s offer and a measured value. Three self-test appropriate 2 M), 20 MQ), or 30" M Q) range
far more measurement capabilities than diagnostic routines are built in. One test 1s automatically selected.
found in most bench/portable DMM’s. occurs each time the power switch is turned
They are Fluke’s first microcomputer-based on. Therearefiveaca id devoltage ranges on the
handheld DMM’s and consequently offer 8062A from 200 m ' to 1000V for dc,to 750V
The 8060A and 8062A are exceptionally for ac. Resolution is 10 4V on the 200 mV
unique and valuable features never before
well-suited to the needs of engineers, range. True-rms ac accuracy is specified to
found in a small low-cost DMM. The 8060A
technicians, and hobbyists skilled in audio, 30 kHz. Basic ac accuracy is 0.59%.
even measures frequency — from 12 Hz to
video, telecommunication, or computer
more than 200 kHz — autoranging over four There are four ac a1 i de current ranges on
technology. They are designed using the
decades from 200 Hz to 200 kHz. the 8062A from 20 m . - 2A. Resolutic= is
same rugged case and safety engineered
The microcomputer lets you automatically jacks, test leads, and double-fused current 10 nA on the 20 mA range
do such things as subtract lead resistance inputs found on other Fluke handheld
when measuring ohms, convert voltage to dB DMM’s. And the same extensive overload 8060A
or dBm, average each set of updated protection is built in for the other functions ® All the features of the $062A, plus
measurements to reduce noise, take the and ranges. ® Frequency... ' Hz to 200 kHz
® True-rms < voit~oer to 00 ki~
® (0.04% b: A0 ATy
® 0.2% k. "{ ~acx v
® dBm . - ative B measi 2ments
g 345
® Con” _.a ' wmeasu-emen
f
With the 8060A, Itis casvec il i mes - B gain
== 1) REL or luss « “umplifiers filtews, «.
frequency, decibels, . ors, etc.
continuity, or relative v'h a OMM th has dB sato
reference mode is ¢ ohine tha ire in @ hanov.. o
selected with one of also measures frequen: oy ¢
four pushbuttons. The ca.’v i1 .al test instrument |
choice is indicated in toolicati bs. LCD annuncia, s ¢ ap i
the display. the disp ay when the dB or H7 ~usuouitons
are us ¢ to select one of thos 1aei <2
i < el
AVAILABLE FRCM SO HARVEY ELECTRIC PTy. LTD.
76 Yor'- 162-4, Argyle St. s
v Ces Hobart, 700C.
AN
Az. VA
S VOT
i
00”,7".233