QRM ocr
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May i
Issued by the Tasmanian Division of
the Wireless Institute of Australia
Radiotorial (onument
It would be pleasant to think of QRM as a sort of publicity
organ for the WIA, and, in its way, it probably does fulfil that
role. However, over the last few months, our output has tended
to put us in the category of "technical bulletin" rather than a
widely-read news-sheet. With the imminence of the 75th.
Anniversary Hamfest to be held over the weekend of June 8th and.
9th, a great deal of work is going on - on the part of a rather
small number of people in the WIA. Some of it you hear about on
the broadcast, but not everyone is able to listen on Sunday mornings,
so it's important that the written word carries its share as well.
There are over 300 members of WIA in Tasmania and if each one of
those members took just a small part in the build up to the Hamfest,
then the occasion will be the roaring success that a 75th Anniversary
deserves to be. Or are you going to be one of those who, after
sitting back and doing nothing, will complain that the whole event
didn't come up to scratch? We need all the publicity we can get,
and every member can help in this. Get all the information you
con from inside QRM and if you need more, ask Committee members,
particularly VK7DY, VK7KAD, VK7ZAR or VK7JK. Then talk about the
June weekend to others, not only amateurs, but friends and neighbours.
Our hobby may benefit as a whole from your efforts.
VK7 JK.
Don't miss the FREE Cocktail Party on June 8th. Ticket enclosed.
EQ U.IP ME NT WA NTlE DF i
HF Transceiver to suit novice. Please contact VK7NYL. QTHR.
:
BEWARE THE UNCOMMON COMMON
Those of us who are jus t mo vi ng on to pr oj ec ts wh ic h ar e re la ted
to digital I.C 's, co mp ut ers, etc ., ar e po ss ib ly lo ok in g at ne ga ti ve
supply volt ag es as a new re qu ir em en t. Mo st se t- up s re qu ir e bot h
positive and ne ga ti ve 12 -v ol t and po si ti ve 5- vo lt su pp li es . So me
also requ ir e ne ga ti ve 5- vo lt s. Po we r su pp li es us in g I.C . vo lt age
regulators are norm al ly qu it e st ra ig ht fo rw ar d an d pr es en t no pr ob le ms -
IF the data sh ee t you ha ve is re li ab le . Th er e is, ho we ve r, a re ad il y-
available re fe re nc e wo rk (%1 , re fu nd ab le on .a $1 0 pu rc ha se ) wi th the
following data shown:
Soenet RoatrSoris
=" ="
78xx Positive Regulator Series
; OUTPUT ~ OUTPUT
i L INPUT P v
A" CoMMON ' COMMON CONMON
Top View Top View
Following this inf orm ati on alm ost cer tai nly gua ran tee s tha t sal es of
rectifier diodes wil l inc rea se dra sti cal ly. In the 79X X ser ies , in
fact nearly all neg ati ve reg ula tor s, the hea t sin k tag or body is
common to inp ut and mus t be iso lat ed fro m all the pos iti ve com mon s.
The pin out s are cor rec t, but the tag or bod y sho uld mor e pro per ly
be labelled "in put " as in the cas e of som e mak ers ' lit era tur e.
So, beware the unc omm on com mon - the com mon on the 79X X ser ies
must be isolated.
Russ, VK7ZRP.
B Lt b so e i i g
FOR 3 AL ok .
(From the estate of VK7DK)
Three-element 15/10 metre beam, Hidaka VS/22 ... . 20 OoR0
Four-element 20 metre beam, monoband, Hi-gain 204BA $150.00
IC701 and PS701 transceiver and power supply ... SoSmeE O
Hard-to-come-by FT101B external VFO ... ... ... ... $100.00
(All these items subject to near offers)
Apply to VK7JV. QTHR or 003.443798.
ee e St
QRM's A.L.A.R.A. PAGE.
Contributed by Helene, VK7HD.
THINK A MINUTE - IT'S MURPHY'S LAW.
Any wire cut to length will be too short.
If a circuit cannot fail, it will.
A fail-safe circuit will destroy others.
Interchangeable parts won't.
A transist or pr ot ec te d by a fa st -a ctin g fus e wi ll pr otec t the fus e
by blowing first.
A erystal oscillater, if it oscillates ot all, will
oscillate on the wrong frequency.
After an instrument has been fully assempled, extra components will
.
be found on the bench.
Components that must not, and cannot, be assembled
incorrectly, will be.
If a project requires X components, there will be X-1 components
available.
In mathematics the decimal will always be misplaced and the constants
will be variable.
In specifications, Murphy's Law supersedes Ohm's Law.
There are three kinds of people in the world (Extract from World Radio):
Those who make things happen.
Those who watch things happen.
Those who ask what happened.
Which group are you in?
e
PLEASE SHOW THIS TO THE YL's IN YOUR FAMILY.
To celebrate the 10th birthday of ALARA, the committee
has organised a "fun" contest open to all YL's in VK and ZL.
The date Saturday July 6th from 06.00Z to 12.00Z on
Novice Sections of 10, 15 and 80 metres. The winner will be the YL
who makes the most contacts, or in the event of a tie, the YL who
works the most prefixes. One contact with each YL only, and may be
on CW or phone.
All YL's are invited to participate. Other details will
be in the June issue of "A,R."
75th ANNIVERSARY HAMFEST INFORMATION.
Home Brew Display: Please send information on your contribution to
Alan, VK7ZAR. QTHR.
What power supplies will you require?
How much space will you need?
Please indicate what is the purpose of the equipment (it may not
always be obviou$ to the uninitiated!)
Would you be prepared to talk to fellow amateurs and others about
the design of the displayed equipment and the problems you may have
met during the construction?
The Radio Flea- Market: Don't forget to bring in to the Hamfest
Centre all your re-cyclable gear, pre-loved transceivers and in fact
ALL the equipment that used to be your pride and joy BEFORE you
up-rated to your present superb set-up, including those analogue
meters that served you well before you went digital!
Empty your spares box, load the trailer or the boot of the car and
BRING EVERYTHING TO THE GREAT RADIO FLEA-MARKET!::!:
CARTOON CORNER - NOW IT CAN BE TOLD.
The Hamfest Planning Committee at work.
US.A. on 2n. by Harry, VK7CZ.
Last year, while I was in America, in Michigan to await the
arrival of the first grandchild, although not having my full call very
long, I wrote to the necessary authorities and obtained a reciprocal
licence with the intention of doing some operating over there. I had
no equipment but intended to buy a 2m. rig while there. I looked
through the manuals here and had almost decided on an ICOM 02AT. It's
rather interesting that looking at catalogues makes it easy these
days to ring for prices, even overseas. To ring American suppliers
takes only a few seconds if model numbers are quoted.
The baby arrived, mother and grandmother were busy. Grandfather
was a little less busy and set out to buy his rig. Again, from those
magazines, eventually a decision was made on where to buy. Then, how
do I get there, even having a car at my disposal?
We were situated at Troy, 16 miles north of Detroit. The country
side was flat and the road system in one mile squares, with the roads
running north/south and east/west. The E/W roads for convenience are
named 14 mile, 15 mile etc., which makes navigation pretty easy.
To go to my selected shop in a small town on the Lake some 25
miles east, I had only to go to the corner from our unit, turn right
and stay on that road. It became a 2-lane, then a 4-lane (each way),
but stay on it I did until I eventually pu led off at the preselected
exit and lo and behold - there was Michigan Radio in what was virtually
a fishing village.
The sho p was run by a man and wif e tea m. He was out ser vic ing a
fis hin g boa t rad io but his wif e was far mor e kno wle dge abl e tha n I -
a rea l mi ne of inf orm ati on. Als o in the sho p on tha t very hot aft er-
noon were four (to me .
) eld erl y peo ple , tra vel lin g up fro m Ala bam a,
who were having some trouble with their CB radio! They were just
wander ing aro und U.S .A. , wer e qui te hap py to tal k and wer e wor th
listening to.
Anyway, I bought my rig and wen t hom e to pla y wit h it. (I hav e
since kicked myself tha t I did not buy the 2m, mag net ic bas e ant enn a
with all fittings for $12. A very neat unit). '
There were some peculiar nets round where I lived. The one
heares t to me was run by a lad y cal led Ger tie , and a ver y eff ici ent
lady she was, too. Aft er som e day s, I eve n kne w how her end -of -se aso n
bottling was going. She was alm ost the onl y lad y "op " in tha t are aq,
but she really had the net org ani sed and ran it wel l. The re was als o
a lot of mor nin g and eve nin g tra ffi c bet wee n com mut ers .be cau se of the
distances inv olv ed. All ver y pro per , wit h cal lsi gns qui te cor rec tly
used. Aga in, ver y int ere sti ng lis ten ing . A lot of the eve nin g tra ffi c
covered comput ers - bes t typ es, mak es, sup pli ers , - inc lud ing muc h
— adverse comment regarding one large supplier:
One comm en t I he ard wh ich was wo rt h re pe at ing: Th er e wa s a TV sh ow
one evening (3hours of it) whic h de al t wi th the sh ortcomings of the
American educatio n sys tem , and the fo ll ow in g mo rn in g one dr iv er as ke d
another if he had wa tc he d it. On he ar in g tha t his ma te had not , and
having been asked what it was abo ut, ga ve the su bj ec t and su mm ed up the
progra mm e wit h, "T he y sai d our ki ds ai n' t le ar ni n’ pRt RuE D |t
I lea rne d a lot in the U.S .A. wit h my lit tle 2m han dhe ld!
e.
WaAi N T Bib: i,
Linear amplif ie r to sui t 70 cm ha nd held . Co nt ac t VK7CV. QT HR or
call on Repeater 2.
et
Hamfest QSL Card Display: To make the QSL Card display at the
Hamfest 1985 a success, I call on all
WIA members to co-operate by sending me an unprocessed card for
displa y. Af te r the Ha mf es t, I ha ve in mi nd to st ar t an arch ive of
VK7 cards first for future generations.
It woul d be appr ec ia ted if an yo ne wo ul d be wi ll in g to len d me
foreign QSL cards to augment the Hamfest display.
Please contact: G. Visser, 10 Maranoa Road, Kingston, 7150
VK7DAQ.
Attt
The copies of this newsletter will be distributed to WIA
mem ber s at Bra nch meetin gs and to oth er intere ste d sub scribe rs
by post at purely nominal cost. Anyone who would wish to take up
this offer, please contoct the Editor on 002.293402.
ee ——————
Australia
The Radlo Amateur Satellite Organisation of the Wireless Institute of Australia
National Co-ordinator; Graham Ratdiff VKSAGR All communications to:
‘AMSAT-Australia’
NEWSLETTER *'a . s
Ohhbine
(08)2975104
Phone:
first official 'AMSAT-Australia NEWSLETTER'. Last month I sent
This is the
out a limited number of copies 0of a sample NEWSLETTER to gauge the response
to such a monthly publication. In general the response was favourable with
quite a8 few use ful sug ges tio ns bei ng put fow ard . The ref ore I hav e deci 1ded to
NEWSLETTER or a trial basis for one year commencing with this
produce the
issue.
WS LE TT ER are two fol d. Fir stl y, as a sou rce of the
My aims in producing a NE
-t o- da te in fo rm at io n av ai la ble at the tim e of pr in ti ng (i.e. 1-2 day s
most up
re ce iv in g you r cop y) and sec ond ly, as a mea ns of co ll ec ti ng a
‘prior to you
rev enu e tha t can be spe nt sp ec if ic al ly on the pu rc ha se of
modest amount of
ha rd wa re nee ded by any gro up of aou r ch oo si ng who are at the tim e
satellite
currently building an Amateur satellite.
, if you wou ld lik e to receiv e a s mo nt hly : cop y of the
The ref ore
tr alia NE WS LE TT ER ' cou ld you please sen d a do na ti on of $1S 5 wmade
*AMSAT-Aus
e to the W.I .A. to AM SA T- Au st ra li a C/- Box 123 4 G.P .O. Adel aide S.A.
payabl
e su bs cr ib er s the bet ter wil l be the NE WS LE TT ER and Au st ra li a' s
SOt. The mor
nt ri bu ti on to the Ama teu r Sa te ll it e pro gra m, so pl ea se let as many as
co
possible know about the availability of the NEWSLETTER.
To ma ke the NE WS LE TT ER a su cc es s 1 nee d inp ut fro m YOU the sub scr ibe r,
otherwise, the content will be limited to only that information which 1
obtain from Telemail, UO9 & AO1P bulletins, AMSAT-UK's Oscar News, AMSAT's
Satellite Journal (ASJ) and Amateur Satellite Report (ASR) . The type of
input' in wWhich I would be particularly interested is the 'Hints & Kinks’
that you have discovered over the yzars that would be of benefit to others,
in particular the newcomer to Amateur Satellite activities. For example
Charlie Rufus's (VK4UQ) method of matching a helical antenna feedpoint,
computer programs for automated satellite tracking or decodeing telemetry,
homebrew RS232 interfaces for the VZ200 and 2ZX81 computers, Mode L
upconverters, however small the idea or information DON'T keep it to
yoursel+f. Another method of helping others is to have the answers to your
gquestions published {n this NEWSLETTER so that all can benefit, so please
{f you have any nagging question do not hesitate to write seeking an answer
which I will attempt to find and subsequently publish. For example - what is
the sigriificane of the First Derivative of Mean Motion in the Keplerian
Elements 2?7277 :
T1l11l next month or on 3.685MhZ Sunday nights at 18@8UTC
Cheers 73's Graham VKIAGR
UoSAT-1 Uaosat -2 RS=5 RS2 Z RS-8
Period (min) 94.35683852 72.5567248 119,.555309 1 19 Siraswisl 119+ 265139
P-Drag 1.86%Se-6 S e 2.4e-7 2.4e-7 2.49e-7
Long Inc(deg)23.5369874 24.63846447 IBsel o702 29925370 28.868747
L-Drag 2. h2%es s 4.261e-6 a Q 2
Discuusian on AMSAT Oscar-19’'s Orientation
PSK Bulletin AMSAT Day #2621 at #2009 UTC Orbit #1322 MA 187
N de VEISAT/VE6: 1322/75:New plan due ta SS's hiccup at 26 deg.
1. leave s/ where its at until approx April 15 (end of eclipse)
2. April 15 (+/-) move s/c to 170/d (new time for mode L also) :
3. May 1 (+/-) move s/c to 18@/@
4. June 7 (+/-) move s/c to 1998/0
S9. July I (+/-) move s/c to 230 (modeB,L times will change also)
so really nothing changes after |5 Apr from the other schedule
7?3 Randy
Py
Aft er hea rin g the abo ve N blo ck men tio ned on the AMS AT net on Sun day the
17th of March, John VK3ZEM must have swung instantly into action to
produce the pri nto ut sho wn on the opp osi te pag e whi ch wil l hel p tho se
like me pic tur e why Osc ar- 1@ is bei ng re- ori ent ate d on the dat es giv en in
the PSK bulletin. In short, the command stations are trying to maintain
s sol ar i{l lum ina tio n aro und the 99 to 95% mar k and nev er les s
Oscar-19'
than 80%. The three diagrams below are an attempt by me tao demonstrate
s 'Lon ’' ang les ref err ed to abo ve act ual ly mea n in ter ms of
what the variou
the ori ent ati on of the spa cec raf t at apo gee and the ref ore at wha t mea n
spacecraft antennas are pointing directly at the
anomaly value (MA) the
earth’s cen tre . The mat hem ati cal rel ati ons hip I use is Lon /36 8%2 56 M.A.
uni ts. The ref ore whe n Osc ar- 1@ is reo rie nta ted to Lon 239 on Jul y 1 the
antennas will be pointing at the earth's centre at MA value 238/369%256
i.e. 164.
= 130°
For those interested in how John produced the printouts on the opposite
page, he wro te two pro gra ms for the Commod ore &4 bas ed on inf orm ati on
lis hed by Jam es Mil ler G3R UH in ‘Os car New s' the AMS AT- UK Journa l. If
pub
you would like a listing of the program just send me an SASE or write to
Johrn direct for a copy of the program if you have a Commodore 6&4.
James Miller G3RUH has also written his own version of Tom Clark's
rhi e’ program. His. version prints out another very interesting
parameter which he calls the 'Squint Angle’. The 'Squint Angle’ 1s
defined as the angle between the spin axis (the axis parallel to axis of
‘he antennas) of the spacecraft and the observer. If the ’'Sguint Angle’
is greater than 38 degrees, then in Jim's opinion there is little point
tn trvimg to work Oscar-10 as you our outside the eftective capture area
@ the spacecraft’'s high gain antennas. Hopefully within a week or so0 an
up-to-date version of this program should be available from
AMSAT-Australia so i 7on are interested send me an SASE.
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:
Tarville"Courd,
1%,
Blackman's Bay,
Hobert, 7824
And when you lose your copy of QRM, remember he's QTHR. When
he is at home, the 2m rig is normally running and listening to
Repeater 2.
COMPUHIT ER INFORMATILON,
Here are the directories of the only User Grour volumes
containinscoHam Radio erosrams that I have found. Both SIG/M
and CF/M are user aroups for the CF/M orerating system thus
machine tanzuazss prosrams are only usable on the 2020 and
288 micro Frocessorss and will need to be modified if vou
Aara npot USifi? RN
Pl
b
e e ic oerosrams will wvery likely have to he
modified to suit vyour particular dialect of Basic but should
T E Tt ee
The disks are available from many sources for a
amall fees the most I ever paid was $20, that includes the
cost of the disk and the postase. If you have a modem and
want Just one or two of the progsrams you may ephone me at
pOZ-4437%% after hours and we’ll send it down the line or
oraanise another timei'f inconvenient. If vou have an 8"
disk=drive and ars able to read IBM sinsle density: Pay me a
wpent ool et Tl caby thHE WiSks For You.
John VET7JIV
SIG/M Yolume 143 Parlket Radios Frinter Utilitiess etc
moftw3re Tools of Australia (extracts)
~CATALDG, 143 conternbeeafoMEMaMad uma: 14
e leaged 12 dvgpline rosp0 1 RS
s B S UMSHUSesze PrOY9rAan
: o checksum Prosram
2 drei s BaAM il disk donation form
1hde s CrE T Lonilze T descrirtion
143,81 MxTkN «BAS e 74 wF Electronic attenuator desisn utility
182.82 DEFREL .Lfif b £12 4% Depreciation schedult
145, 63 n&hINIFX TR 2Ok 2% AQG Generates index for WordStar text file
142,64 bENTN?tX‘i,i Lk o b /
142,05 THRBEX AL 1#
f 18allt o4
aa. s IniET L9 i S &7 95 WordStar indexing utility
145 .87 TUUP*[email address removed] 11K 41 14
g g e s e F0 EB Print erogram for MAZ@, wildcard names
142,09 LFR IR 14k B& 16 & clock
143,19 HGFTH L PEE 7 FE #2 Facket Radio Software for CF/M Systems
L4z h 1 FACEET . AlM S5k ich R v
ee “%P = WB &k 85 2A ¥
Pa=. 13 EaEEE LRET 12k DA &4 /
145,14 PafkET-0
. i ok A2 U
fg=, 5 maiEERE T 14k oL 1
143,14 SFACHECEE, Tl 15k =4 A0/
4= 17 ERINGER TNE 2 @] 2% Control codes for EFSON MXZ2@ eprinter :
143,12 RORFLIN . MaC 1 3 8% FORTRAN routine to access CP/M ROR and PUN
14301 RESXIDE AR 13K F1 Y& Example of MF/M 2 Resident XIOS
185,06 SEMX « AL 4k v BA Epson MXEQ printer setup utility
14501 SETHX o (MBS 2k i e
143,22 SETIH . =M & 7JE 24 UOkidata printer setup utility
145,25 SET S0 o gdndigr v
143.24 NIDED . INF Ak 24 7 Video terminal codes
142,25 VIDEONEW.
INF 1k BLous /
More information next month.
, : PRICE LIST
@ IC OM ; AMATEUR PRODUCTS 1st October 1984
MODEL DESCRIPTION ReRP.
ACCESSORIES (Cont'd)
oC 1 OC Operation Pack for IC 2A/IC 4E 22.50
OC HD OC Power Cord for 5SID/701/7208 = » 15.00
OC PUR. DOC Power Cord for Specific Radio : : 12.50
EE PS20/PS15 Adaptor Cable | 1516
£X 108 FM Option for IC 551/IC 551D : 153.00
EX 107 VOX Option, IC551 (incl. w/S5ID) 67.00
EX 108 PBT Option IC 551 (incl. w/SSID) = 134.00 s
EX 144 CF1 Adapter for PS 1S Power Supply 750
EX 195 Marker Unit for Frequency Calibration 33f00
ForEE H30
EX 198 Remote Frequency Selector for 22U 40.00
EX 202 LDA-2 Unit for Auto Band Switching IC730 18.00
EX 203 CW Audio Filter 150Hz/6dB IC 730 20.00
EX 205 TRV Unit for Transceiver Switching IC730 19.00
EX 241 Marker Unit for IC 740/IC 745 22.00
EX 242 FM Unit for IC 740/IC7&5 45.00
EX 243 Electronic Keyer Unit for IC 740/IC 745 59.00
EX 248 EM Un1t for IC 505 : 51.00
EX 257E 0. Fm Unif for R70/71A 51.00
£X 309 Interface Unit for Micro-Computer 73.00
IC 751/271A/471A/RT1A
EX 310 Voice Synthesizer for Frequency Readout ; 68.00
IC 751/R71A
FA 1/2 Flexible Antenna for IC 2A/IC 4E 12.00
FL 30 SSB Passband Tune Crystal Filter for IC730 56.00
Bl 22 Cw Filter for IC 720A/R71A : 56.50
Bl 38 AM Filter for 751A 53.00
EL. 34 AM Filter for IC 720A 53.00
FL 44/A 455KHz SSB Crystal Filter for 730/740 §9.50
745A/R70/R71
EL 45 CuW/N Crystal Filter for 740/745A 65.50
FE 52N 455KHz S00Hz CW/N Crystal Filter for 110.00
740/745A
Bl SEN 455KHz 250Hz CW/N Crystal Filter for 740/745A 110.00
Bl 5Y CW/N Filter 135Hz-6dB for ?30/7&D/R70/7a5 65.50
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® Measures resistances to 300 M ()
® Self diagnostics
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Because the 8062A has several unique
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may appear in the LCD readout. For
+ .
- R
example REL will appear when the relative
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8062A 300 MQ) top resistance range in the 8062A is
fifteen times higher than the usual 20 MQ).
The 8060A and 8062A reciprocal of period measurements to To keep the front panel simple, there is only
indicate frequency, and display only the
4'/>-digit true-rms DMMs one manually-selectable position above
difference between a stored reference value 200 k. When that position is used, the
These two 4!4-digit handheld DMM’s offer . and a measured value. Three self-test appropriate 2 MQ, 20 M), or 300 MO range
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The microcomputer lets you automatically jacks, test leads, and double-fused current 10 nA on the 20 mA range.
do such things as subtract léad 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 8062A, plus
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® True-rms ac voltages to 100 kHz
® 0.04% basic dc accuracy
® 0.2% basic ac accuracy
® dBm or relative dB measurements
® Conductance measurements
/kHz‘ dB =>4l
. REL With the 8060A, It is easy to accurately measure the dB gain
> b
Jfrequency, decibels, or loss of amplifiers, filters, attenuators, etc.
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selected with one of that also measures frequency provides a
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