QRM
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QRM
Newsletter of the Tasmanian Division i
of the
Wireless Institute of Australia '
(Insert in ‘A.R.")
R.
DIVISIONAL DIRECTORY.
Postal Addresses:
Tasmanian Division: P.0.Box 1010, Launceston, 7250,
Southern Branch: P.0.Box 123, Sandy Bay, 7005.
Northern Branch: P.0.Box 275, Launceston, 7250.
Northwest Branch: P.0.Box 194, Penguin, 7316.
Divisional Officers 1986/7:
President: Peter Frith, VK7PF.
Secretary: Barry Riseley, VK7RS.
Treasurer: Frank Beech, VK7BC.
Asst. Sec.: Robin Harwood, VK7RH (Also Minuting Sec.).
Federal Council: Joe Gelston, VK7JG.
Council Member: Byron Dilworth, VK7BD.
Vice- Pres. Arthur Tregaskis, VK7SE.
Vice- Pres. Russ Pitman, VK7ZRP.
Branch Notices:
NORTHERN BRANCH MEETS AT 8 P.M. ON THE SECOND FRIDAY of each
month (except January) in Room G25, Swanson
Building, Australian Maritime College, Newnham, Launceston.
Next two meetings: June 13th. July 11th.
NORTHWEST BRANCH MEETS AT 8 P.M. ON THE SECOND TUESDAY of each
month at the Penguin High School.
Next two meetings: June 10th. July 8th.
SOUTHERN BRANCH MEETS AT 8.15 P.M, ON THE FIRST WEDNESDAY of
the month, at The Activity Centre, 105, Newtown
Road, Hobart.
!
)i
Next two meetings: June 4th. July 2nd.
Broadcast Officers:
Divisional Co-ordinator: Arthur, VK7GH, 34, Ashbolt Crescent,
Lutana, 7009.
Tel: (H) 002.284963. (B) 002.305600,
Northern Branch Officer: VK7AV Bill.
Northwest Branch Officer: VK7ZFH Frank.
Southern Branch Officer: VK7GH Arthur.,
Broadcasts commence 09.00Z every Sunday, normally originated on
2m., with relays on 80m., 40m., 144.1 MHz (SSB) and ATV.
3.
Radiotorial,
Suddenly, it seems, the air is full of new ideas and
new proposals, John, VK7ZJA, is planning the establishment of
an RTTY beacon in North Hobart, to be run on a frequency of
52,540 MHz, and in fact the proposal is before the DoC at the
moment. Rai, VK7VV suggests setting up a state-wide Used
Equipment Register to facilitate the interchange and checking
of amateur equipment of all types, especially to help those who
are trying to build up their gear for the first time. Details
of both these schemes will be published as soon as space allows
in "QRM"
We would, however, like the opportunity this month to quote
from an article in "Micom", the newsletter of the Microcomputer
Club of Melbourne, to whom we send our thanks and acknowledgments.
There is in the April issue a long article on a "Public Digital
Radio Service", and the Editor comments in detail on the many
issues involved, Without altering the intent of his comments, we
quote extracts. (The full article is available at the Activity
Centre for those interested). "It may not have occurred to many
people, but there is no technical reason why you cannot send
messages or computer programmes across the country, or around
the world for FREE. Amateurs do it all the time, but a certain
technical ability aond a knowledge of Morse is required. Many
more people would be interested in joining the ranks of hams if
Morse were dropped. But amcteurs oppose this. Yet it's true
that many people who do not wish to become hamradio operators
under the present terms would like to have some access to the
airwaves for personal communications purposes. This is why CB
was so popular for a time., Technical limitations of the equipment
and immature actions of some users, unfortunately, meant that
most serious users left the band in disgust. The PDRS proposal
dppears to be one way of allowing more people to communicate via
the airwaves while still having safeguards to prevent certain
users from turning the system into another electronic pigsty.
My question is, why should telephone companies, commercial
packet networks, broadcast interests and postal services be
protected to the detriment of the general public and personal
computer users in particular? We have to pay to send data but
the technology is here to allow us to do it for free. We are
subsidising these institutions every time we wish to communicate.
Besides, postal services do not have the immediacy of radio links,'
The above article is, as you will have guessed, American, but
in view of some points being raised in Australia about the use
of packet radio in some of its aspects, we need to consider our
position and be informed on WIA Federal actions in the matter.
Y-,
New members of the Tasmanian Division.
M
We are informed by Frank Beech, the Divisional Membership
Officer, that these are our new members who are, or should
very shortly be, receiving "A.R."
F. Richele, VK7ZBX, Burnie. L.J.Durkin, VK7JP, Orford.
R.E.Glock, VK7LT, Rosny Park. P.J.Sykes, VK7YP, West Moonah,.
A .D.Hay, VK7ZHA, Devonport. D.S.Thomasson, VK7/NCH, Huonville.
F.Clark, VK7KCK, Deloraine (son of the late VK7CK, Poley).
Associate Members:
R.N.Howlett, Rokeby. W. Perleberg, Fern Tree.
S.Bean, Glenorchy. M.R.Wachsmann, Diddleum Plains.
Membership Certificates for some have been posted, the
remainder will be forwarded after the next Council Meeting.
set S
Tasmanian Amateur Radio Convention 1986.
JESMUNLIEN AlGtoULRUd.0LONVenTIon Zoo.
Licensed Amateurs at TARC 1986 - 15th & 16th March.
VK2AV VK7HH VK7MF VK7QF VK7 zBW
VK2ELG VK7JG VK7MX VK7RH VK7ZBX
VK2HA VK7 JK VK7NAI VK7RN VK7ZDD
VK7AK VK7JO VK7NAU VK7RS VK7ZGG
VK7 AN VK7JU VK7NBF VK7SF VK7ZJH
VK7BC VK7KAB VK7NBL VK7SV VK7 ZNP
VK7BD VK7 KKV VK7NBU VK7VK VK7 ZPK
VK7BV VK7 KWR VK7NHG VK7VV VK7 ZPN
VK7DE VK7KY VK7NJJ VK7WJ VK7 ZRF
VK7EK VK7LA VK7ZNPT VK7WP VK7 ZRP
VK7EL VK7LT VK70L VK7WW VK7ZTA
VK7FR VK7LZ VK7PD VK7WZ VK7ZTT
VK7GH VK7MA VK7PF VK7 ZAP VK7 ZWW
VK7GP VK7MB VK7PYT VK7ZBT VK72Z
T . A8 S Al1 e AR T sT T v
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 running and listening to
Repeater 2.
8.
Design of a Bandpass Filter . for 2m. Band,
by B.P.Dilworth, VK7BD.
Having recently acquired an older style solid state two metre
FM Tx/Rx, I found that on air tests showed that there was a
noticeable output on 216 MHz, which is 'spot on' Channel 11, the
local T.V. translator output, causing TVI on transmit. This
output on 216 MHz is low level but still bad enough to cause
problems in the local area. It is an unfortunate result of the
Tx design as no complex filtering is provided at the output
stage - this situation is common among some simpler Tx circuits,
Source of Problem:
The 216 MHz output is a result of third harmonic
output of the 72 MHz stage, i.e. 72 MHz signal is doubled to
give desired 144 MHz output, but some tripling to 216 MHz also
Aumo[?;[] T @ ‘[ @ | J/
Fu ' BMHz XTAL ; [44 MH2
MOD 29 MHz 72MHz Lt
NX3 L. UNWANTED
‘oo 2t MHz StenaL .
2m, Tx -Typical of Popular Home-brew types.
Solution to problem: Two possible solutions exist -
a) Redesign of P,A. stage to increase
suppression of unwanted output.
b) External bandpass filtering to swppress
out-of-band signals,
Not wishing to alter the design of the transmitter, as in a),
with the possibility of introducing more complex problems, I
decided to take alternative b) and design a suitable 'outboard'
filter. This choice was also made as the filter could also be
used to clean up very simple 2-valve type transmitters (Mini-
tran 2 from "A.R." march 1962) which I had built.
After studying various alternatives, I finally settled on co-
axial cavity types as described in A,R.R.L. publications, and
modified these to suit locally available materials.,
Design: This is shown in the accompanying drawings - note use
of older Imperial measurements. This was done as older copper
pipe was used, having Imperial dimensions,
The drawings should be self-explanatory. All rods and $" pipe
are soldered to the base cap, and the caopacitor Cl1 is fitted
between the outer pipe and the inner one - also providing
support for the top of the inner pipe, so use a mechanically
strong ceramic insulation type here. Whilst on C1, use a type
.
with a lockable shaft or stiff movement as this sets the pass
band and should ke 'bump proof’,
On air tests.
The filter was connected to the Tx/Rx and peaked to give
maximum Tx output power. There were no noticeable changes in
signal reports given with the filter in or out of the antenna
line., A portable colour TV was placed near the transmitter and
Ch.11 selected. With filter out, the TV was overloaded and the
received programme totally lost., With filter connected, the TV
showed no signs of interference, and thus the problem was
solved. Running 1 watt Tx power and with the 2m. and TV
antennas only one metre apart, slight interference occurred,
but this also happened with commercially built Tx, so pure
front end overload of the TV (a midrange Japanese model) is
suspected.
n "
30pF |2 (D Copeer Pipe (2 Low
¢l Y ow om 10%" ' BRAZNG Rop
38" Lone
=
e3
SN N N SS S S S S SSSAISSKNKK
N
Ref: QST, 1964, A.R.R.L.
Amateur Radio Handbook, 1976, A.R.R.L.
B.P.DILWORTH, VK7BD,
4, Anson Street,
Waverley, TAS.
7.
AWARDS, by Bob, VK7NAI.
News comes again from Ivan, ZL1AQO, of another New Zealand
Award. This time the award is called
THE RIVERTON 150th. ANNIVERSARY AWARD.
To qualify for the award, you are required to work the Special
Event Station, ZL4RAC, plus five other stations who are
members of either Branch 08, East Southland, or Branch 37,
Southland, between 1.7.86 and 31.7.86.
Log extracts together with $3.00 must be forwarded before
31.8.86 to:
Riverton 150th, Anniversary Award,
P.0.Box 1260,
Invercargill, New Zealand.
The award is available only for contacts on 80m. or 2m.
I will attempt to organise a special net one Saturday night
in July.
I would also like to remind you about the TARAWERA CENTENNIAL
AWARD, an award, sponsored by the Rotorua Branch of NZART,
and ingituted to commemorate the eruption of Mt. Tarawera
100 years ago. The duration of the award is from 10,5.86 to
10,6.86 and to qualify, you are required to work five (5)
Branch members (NZART Branch 33).
To earn the 1886 endorsement, you must work ZL1AVG on Mt.
Tarawera on Tuesday 10.6.86. (I will attempt to have this station
come up on the Devil Net that night),
The usual details are required and logs (I am not sure if they
need to be certified) must be posted to arrive before 17.7.86
with the Awards Manager, Rotorua A,R.C., P.0.Box 1984,
Two special prizes of free return flights to the top of Mt.
Tarawera will be awarded to the first two recopients of the
award carrying the 1886 Endorsement,
To assist you with the award, you might call on 3.686 or
7.086 MHz, I have been assured that during the course of the
award, Branch members will be active on the Novice section of
the 80 metre band.
Bob, VK7NAI,
WOULD ALL ASPIRING CONTRIBUTORS TO "QRM" PLEASE NOTE THAT
THE EDITOR'S CLOSING DATE FOR THE JULY EDITION WILL BE:
15th. JUNE,
3.
QSL_BUREAU
OUTWARD CARDS
A correctly completed card is an essential requirement for the issue of
many Awards so make sure your card at least shows the following information:-
Your Call Sign and full address.
Call Sign of station worked and confirmation that a two way QSO has
taken place.
Date and time (UTC) of QS0, band, mode and signal report.
If you make a mistake when writing out a card do not alter it but fill out
a.newv card as an altered one will not be accepted for Awards.
When having cards printed do not choose heavyweight type of card and
make sure they are no larger than 140 x 85 mm (5% x 32/8 in.) OUTWARD CARDS
LARGER THAN THIS WILL NOT BE ACCEPTED as they weigh more, will nof Tit in a
standard sized envelope and will not pack easily in bulk with others resulting
in damage to your card.
The charge for outward cards is 2¢ each (non members 6¢). This covers
cost of postage, envelopes, P.0. Box rental, etc. Sheets of 100 stickers are
available from QSL Officers and the Bureau at a cost of $2 and one of these
stickers (three for non members) must be affixed to each card before being
handed into the Bureau.
PLEASE sort your cards alphabetically by prefixes with Australia and U.S.A.
into Call Areas as there is a separate Bureau in each Call Area. All the
various U.S.A. prefixes should be sorted together and treated as "W" prefix,
but those for other than continental U.S.A. (such as KH, KL7, KP4, KGé etc)
should be kept separate.
Write the call of the station it is for on the back of the card and if he
has a QSL Manager show this, viz "BV2A via K2CM" so that I knowv to send it to
the W2 Bureau. Cards are sent in bulk to other Bureaus and only sent direct
if there is no Bureau in his country and his address is known.
INWARD CARDS:
Invard cards for North and North West Branches are sent to the QSL Officer
concerned monthly and may be collected at the Branch meetings. Cards for
members in the South are taken to three successive meetings and if not then
claimed are held at the Burzau for 12 months and then destroyed. Country
members who cannot attend Branch meetings may have their cards sent to them by
lodging a few 160 x 114 mm (6% x 4% in.? self addressed stamped envelopes.
I§ you do noz want youwr cards fLet me know and Zhey can be destroyed.
00009O LEONO0OCCOOOSGEIEOEOOSO
©© 00000900000
The Bureau address is G.P.0. Box 371D, Hobart 7001, but I would prefer
that cards, enquiries etc, be sent to my home address, 95 Wentworth St.,
Bellerive 7018 (phone 442854)
Chas. Harrisson VK7CH
QSL Manager
9
Problem-solving Guide for the "TAS DEVIL" Rig.
PROBLEM POSSIBLE CAUSE REMEDY
Audio Amplifier Unstable D.C. levels Connect 10M res.
motor boating. on output stages,. across C29.
Frequency of V,F.O. VC1 value too low Add 100pF styro
too high (spec. 140pF) across VC1 in
position provided.
RLA operates on Q9 faulty. Reversed Replace or reverse,
application of 12v, Q10 or faulty or Note: RLA operates
incorrect type. momentarily then
releases when 12v
applied.
Low output L2/L3 on wrong Use corfect former
from TX. former. 1050/1/F14 NOT
1050/2/F29.
Q5 overheating., Drive too high, Reduce turns on
L3 to 1 turn,
Increase R12 or R14
Noise bursts C40 C34 C47 reversed Correct polarity.
from RX. C47 (-) to base of Q14
Aerial not TX & RX connections Change over
connected to RX. to RLA reversed. connections.
Random "Buzzing" C17 holding charge Connect 47K res.
from side-tone at the threhold from junction of
on transmit, voltage of CMOS IC3 R28 & C17 to E.
pre-amp.
Please Note: Technical assistance regarding the "Tas Devil"
rig is available from its designer, Ian, VK71J
(VK7KAN) or by phoning 002.279142 a.h.
Winding details for L2/L3
u. (=
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73's de VK71J.
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A.T.V. Experiments.
On 23.3.86 at 1 o'clock, Bruce Livingston and myself (VK7ZAL)
left East Moonah for the Springs, Mt. Wellington, for ATV
experiments with VK7/ZAR. The tests from the Springs were not
successful. We then moved to the Lookout, halfway up the
mountain, overlooking Hobart and near a building for walkers.
This test was also unsuccessful. It was worked out that the
inverter driving the camera was interfering with the T.V.
transmitter. We could talk on the T.V. sound with the inverter
turned off. Also the battery
voltage at the equipment was
10.5 volts. The items of equipment taken were: T.V. Camera
and Power Supply, 12/240 volt inverter, T.V. transmitter,
HL 120U UHF Linear Amplifier, and an 1l-element Yagi antenna.
The antenna was supported 17" above the roof. Our 2m. hand-
held was tuned to 146.45 MHz. Although unsuccessful, we
returned home determined to try again, and so it was that on
27.4.86 we set out for the Lookout once more. By two o'clock,
when the transmission was due to start, it was raining ond
snowing and this continued throughout the stay on the mountain.
This time we coupled the T.V, Camera to the car battery, but
except for the addition of 7ZAR's T.V. set, the equipment was
the same, and the antenna was in the same position, 17" above
the roof. By keeping the car running, the supply voltage
reamined high and 50 minutes of T.V. transmission were made.
A good picture was obtained with average sound. It was
received by 7ZPK, 7ZBW, 7ZRO and 7ZJH.
Robert VK7ZAL.
FOR SALE.
One Dick Smith Monitor and Cover. Original cost in 1985 was
oo
$455.50. Selling only because it§suitable for computers but
not A.T.V. Asking price $200.00. Willing for it to undergo
any tests. Enquiries to Robert VK7ZAL. QTHR,
Broadcast Roster for June.
June lst.: Southern Branch. i
June 8th, 15th, and 22nd.: Northern Branch.
June 29th.: Northwestern Branch.
WIRELESS INSTITUTE STORE (STOCK)
VE7ZEBW (MIKE) STORES & EQUIFMENT OFFICER
FHONF. (202)-28 7010 (OTHR)
PRICE AND STATUS CORRECT AS AT Q4/05/86
5
WTA ITEM DIcF‘RIFTION STATUS PHICE WIiA ITEM DESCRIPTION ~ STATUS FRICE
@1 UNDERSTANDING AMATEUR RADIO 2 ON ORDER % 8.40 45 W.I.A. CALLROOK 1985/86 IN STOCE ¢ 6.50
7 RADIO AMATEUR LICENCE MANUAL > | % 6.85 45D W.I.A. CALLEOOK 1984/8%9 IN GTOCE ¢ 2.00
@ OFERATING MANUAL (2ND EDIT. ' ‘ 46 LOG SHEETS (FER 100 ) L% D.E
&
@4 AKRRL HANDEOOE 1986 > 1,20 47 W.I.A. LOGBOOE LIN BTOCK % .50
25 HINTS % KINKES FOR RADIO AMAT. IN STOCE 6.85 47D MOBILE LOGHOOK RSGE IN STOCK $ 2.40
25D NOVICE QUESTIONS & ANSWERS IN STOCK 4.10 48 THE RADIO AMATEURS WORLD ATLAS IN STOCK 2.00
046 WEEKEND FROJECTS > 7.00 49 STICKFIN TRADITIONAL AUST. IN STOCE 2.00
27 ARRL ANTENNA ROOK IN STOCE 12.90 S@ STICEFIN INTERNAT.DIAMOND IN STOCK - 00
@8 FM % REFEATERS FOR RADIO AMAT. IN STOCK 9.90 51 STICKPIN INTERNAT (CALLSTGN IN STOCH =. 00
@9 SATELLITE EXPERIMENTERS H/ROOK |1 ON ORDER 15.60 52 W.I.A. STICKERS (CAR WINDOW) IN STOCK - 50
R
HHREGBS
10 RADIO AMAT. EXAM MANUAL RSGR 9.1@ AL MINT LOGO (SHEET 0F 1) 1.00
&
11 RADIO AMAT.OFERATING MANU o > 15. 60 <A. TIES ™ [OF 7.50
12 RADIO COMMUNICATIONS H/BOOK 1 ON ORDER 24.50 LA. EEYRING N 3.50
B R BB R SRR
12D AMATEUR RADIO AWARDS RSGE IN STOCK 7.10 (FELT)
.A. FENNANTS IN STOCE '4-90
1 ON ORDER 14,2 (SATIN)
AL FENNANTS IN STOCK 6.00
HHhHH
13 AMATEUR RADIO TECHNIGUES
33333
14 TEST EQUIFMENT FOR RADID AMAT. IN STOCK 14.50 T—SHIRT (75TH ANNIVERSARY) 3 8.00
S HF ANTENNA’S FOR ALL LOCATIONS IN STOCH 15.40 LEISURE SHIRT (LOGO ON FOCKET) i 11.00
16 VHF 7UHF MANUAL. RSGE IN STOCE 21.50 S WINDCHEATER (W.I.A. 1.OGO) ifi . 17.00
EL.
17 CALLEOOE 1985 RSGE s 16.00 6 W.I.A. CLOTH BADGES IN STOCHK
18 UHF COMFENDIUM FARTS 1 & 2 = 5.00 CA1 BELDIN COAX (FRG21 /METRE ;
R RGeS L L
19 SATELLITE TRACKING SOFTWARE IN STOCK 10.80 CAZ BELDIN COAX (R( l)/MFTrV
20 INTERFERENCE HANDEOOE IN STOCK 2.00 CAT BENELEC COAX (N 4 1.98
21 WIRE ANTENNATS FOR RADIO AMAT. IN STOCK . 9.60 CA4 BENELEC COAX (RGE N STOCK
22 RADIO AMATEUR ANTENNA H/ROOK IN STOCE 18.70 CAS ANDREWS HELTIAX (LDF4%Q@) ‘ L0A.
2T BEAM ANTENNA HANDEOOE (NEW ED.) IN STOCE 17.48 COZ N-TYPE ACME CONNECTOR(CT9-19) F.O.A
24 ALL ABOUT CURICAL QUAD ANTENNA IN STOUH 5. 40 VERBATIM FLOPPY DISKS/10 $ 21.00
HHREARAFRARE
25 CARE % FEEDING FOWER GRID TURE | * . 10.7@ CTRL.DATA FLOFFY D /10 5 $ 21.00
26 VHFE H/BROOE FOR RADIO AMATEURS IN S8TOCE 14.50 01 MAGNA SOLDER % FLUX (PER FOOT) IN STOCK ¢ 3.50
27 MICROCOMFUTERS IN AMAT. RADIO NOT AVAIL. 16.60 WI1 ENAMELLED WIRE 14 GAUGE FER/LE IN STOCE '$ . .75
P HAM NOTEROQK VOLUME 1 1 ON ORDER 5.70 WI? ENAMELLED WIRE 16 GAUGE FER/LE IN STOCK ¢ .75
29 HAM NOTERDOE VOLLUME 2 1 ON ORDER S.70
e AMATEUR TELEVISION H/BOOE vOLZ IN STOCK 4. 60
a1 AMATEUR TELEVISION H/EROOE VOLZ IN STOCEK 4,60
32 TV FOR AMATEURS IN STOCHE %.90
R FORIEGN CALLEOOE 1986 * 29.50
4 USA CALLROOKE 1906 ¥ I0.70
35 DX GUIDE ; CIN STOCK 4,70
3 RADIO AMATEUR WORLD ATLAS 2 ON ORDER 4.70
37 R.A. FREFIX MAF UF WORLD FIN STOCE I. 60
I8 A.R AND ELECTRONIC STUDY GUIDE ON ORDER 13.75
39 BASIC TRAINING MAk . NZART ¥
4Q CALLEBOOK 1985 NZART . [ 6. 00
41 RTTY TODAY UN.ELEC. IN STQOCHK Lfi_umm
42 WORLD FRESS SERVICE FRER'S - 1IN STOCE 2. 00
43 AMATEUR OFERATORS H/BOQKE P % T 'UPDATE OCT
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IN STOCE .50
RHERA & HFER PR ABRAAERERFH
44 W.1l.A. ROOK VOLUME 1 -