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THE WIRELESS 'SNSTITUTE
OF AUSTRALi A
TASMAN LAN DIVISI ON
BOX 851.;'. G-. P. 0., HOBAET
OCTOBER 1963 MONT:-ILY BULLETIN PRICE 6d
P.'JSIDENT •THBASl'-EER SECRETARY
^i'. T» Alien Mr. C. Harris son Mr. K. Spiegel
IP^AL . VK7C;H . VK7KS
Registered, a-b &*P. O«, Hobar-t, for tre.nsmission by pcs-b as e. periodical.
GE^RtlL MEETING.
The nex-b monthly noe-fcing of the Divj. sion vi.ll be held in the G3.ub Room.
147 Liverpool Street, Hoter-fc, on LTJ)NESDAy, 2nd Oc-bobe:- 1963, a-b 2000 hours •'
Our lecture this non-fch -uill be given ty Inspec-bor H. 'Lockley, of the
Hobart Police, and his _subject_UPoUce Radio S^s-tem^in Tasnania". "inspector
Lockley is in charge of the PoUco radio -bhroughout tho State, so it "should"be-
a very interesting evening. Visi-i-. ors as usual'are ve^ welcome of course,
NORT_H_MESTERN ZOME-.
The next meeting of this Zone will be held in Lakin's Hall, Ulverstone,
onJUESDAY, 1st Oc-bober, at 2000 hours* At the tirae of going to press I have no
informati. on regarding the gc-bi-^a-bies for the evening.
NORTIEffl'J ZOME.
. The next meeting of -the Northern Zone. T,ri.ll be held a-b 102 Charlos S-fcreot,
Launceston, on FfflDAI, 11-th Oc-fcober a-fc 2000 hours. John Forster VIC7JF w.ll give'
Ms -balk on "Series Gated Modula-fcion" postponed fron last nionth, .
i* T. u. pm®.
Gon-fcriba-bions are still very slow in coning in, so much go that the na-fc-fcer
vras^discussod g-fc Isngth at -bhe last Goui)cil MeQting, and i4?,,^s docided -bo allocate
quotas to tho Zones in an effort to speed up, aa-fctors. As yo¥^&s Divisions quota
has been fixed by Foderal GonvGntion at £200, and -fchis has been dividod-ap as
follows t Northern Zone £35, North Wos-bem'Zone £35 \d-bh £130 for •fchc ros-b.
This is roughly proportiongl'to -the nujnber of fuU members in each Zone. We
would appreciate ad-vicQ fron the tvo Zones no later than the -third Monday in
each month, as to what -their to-bgl is in order -fchat wa may include i-b in the
Bulletin,
2e ?* ?-* ?• Fund is one of vital con.cem to overy liconsse - not only
members of the W. I» A* • With this in aind we would suggest that every licensee
in your area be approached - special efforts at meetings etc» iisua^ly means that
the same few who are shoin. ng an in-fcerest in the Division ty co--u. ng along to
meetings, are con-fcinual^r being "bitten" o
We acknowledge ^ath thanks donations this aonth fron WT^K, VK7ZAK, Hgriy
Harjano, H. A. Wrigh-fc, and the Avalon Thoatre per VK7GB.
Total to date s Northern Zone £2
North Westom Zone 2-10- :
The Rest 24- 2^ 9d
£28-12- 9d
Not a vciy inspiri.ng to-bal for four months is i-b?
COUNCIL MEETIETG. •
Tho_next Council Moe-fcing wiU bo held in the Club Rooa, on MDNDAr. * 21st
October a-b 1930 hours.
SEE YOU AT THE ^MEEST - 2/3rd NOVEMBER
The Wireless Institute of Australia. Tasmanian'. Dx-vision
Oc-bo'be. r 1963 Monthly Biaij o-bin, Pag&
HAMFEST.
^Fhis will be held on SATURDAY, •'2nd NOVEMBER and... SUNDAY, 3rd NOVQ4BER a-b -bhe
sane location as la st'year ". on I''/ir. J. B. Muirhead's property a-fc Carapbell. Town
on the Oressy road, righ-fc a-b the bridge over -bho Macquarie Biver, abou-b 6 miles
from the •fco'un. -. '' ' ' .• . .
Interest is running at'a high lovel and 'given good weather we confidently
expect an even better roll up'··fchan. la st year. .. For thoso who Hiissed ou'fc las.t year
it .is a must - and we feel sure •that -bhose 'tha'fc were -fchero id.il certain.Ly cone
along again,
There will be a small regis-bra-fcion fee this year to help in-covering
. xncidental expenses, bu-fc as this is .only. 2g/6d per member (-the rest of the family
get-in free) i'fc shouldnl-b break anyone. At the last general raoeting a -sub-
eomni-b-boe oonsisting of Ted CiULse VK7EJ, Barney Watson VK7ZAK, Don PprthousQ and
Peter Sc'hulz, 'vas appointed to organise the event snd they are still anxiously
vrai-fcing for soineone to vrrite to them -with a few suggestions. J The VHP Section
are organising •brangmi. -fc'ter hunts and- I believe one or two other ideas to keep you
aaused, are -on •fc he draid.ng board. , •,•., • • •
As you Imow this spot is ideal for a camping week snd, plenty of wad,
•water and trees for putting up auteiinas.. For -bhoss -who prefer acconiEioda'bion
there is a hotel, and a motel in Gampbell Town, but you will hgve to make'your •
OT^I. bookings.. . There will be barbecue on the, Saturday'night, bring you p\-m.
raeat'bu-t refrQsi'inen-bs uill be available at a ncirainal'chargo, BUT BRING A GUiSS,
• It. is doubtful whether -bhs next Bulle-bin will "be out in time to include
the latest news on •the hgmfQst, so lis'fcen -to •bhe. VK7WI broadcast fQi" gny further
infonna'fcion3 • • : :
GGUNG. IL REPORT , -by VK7EB
The Septeiaber raeo'fcing of Go-uncil -wss hold in the Club. Room, on Monday 17'bh
Alt. menbsrs were presen-b except ''7ICTZA. I •who is . away on official business,
Business, briefly,' consis.bed of -bhe follovlng items : Inwrds and
Out-wards CqrrespondencGo A.cc'ouri.ts - psssing for paynient. Report on You'fch Radio
by VK7EB. •t>-eport on the Jaraboree of -fche Air. Discussion on. the Hamfest and I. T. U.
Fund» New Members and Federal businoss.
.
It is interesting'to note that there are nov 3,91 registered raembsi-s in the
Tasmaaian Division,' As the Gonsi-biut-i'on'only a.l,Lr)ws for 200 Eiombers your Oouncil.
has resolved that -bhe legal Officer .Jan'Nichols VK7ZZ inves-fciga-be the steps
necessary to incregse ths allowabLe mea'bership to 300,
Welcome -to the six new applicants . for inenbership this month. • These will
be recommended at the Oo-bober General Meeting.,:..
'• ". Youth Ra. dio; A'fc long last the sets of duplica'fced infoiTiiation sheets have
arrived. Zone Secretaries will be fonjarded a copy, also Schools who have not afc
yet received an issue. Yours truly vri.il now/be fla-b out in writing to all Y« , R.
Clubs - copies of all correspotidence wi.il be forwarded •to Zones concerhed,
Haafos-fc. Date first week end in Noveraber. How gbou-b some sugges'bions
from the North and Iforth West Zones?
JAMBOREE. OF TI-IE AIR.
A reminder tha-b this -bakes place on October 19th and 20th, Understand
that following a raeeting at Soou-fc Hoadquarbors recen'fcly-y various •troops have been
allocated to the stations tald. iig parfc, but I am sure Tsd Board would like.,, to
hear fron others interested,
NEW №MBERS.
We welcome the follo'wing LIGW merabers! Fiill- ; Basil Bames'VKTBL, Ted
Cooper VI?7ZEG, ;№x • SideboUom VK7SSC and Asso.cia-fces ! P. Hildyard, G. K. Rieger,
R. J. Muitton,. R,. 'Davis, R. J. Geovos, (Not-ice that- I had. already included some
of these chgps in last month's Bulletin)
It is pleasing to note that although we had to cancel the neabership
of nine nembers for non-paynen-b of due.s, oiu". -fco-bal neiabership is now 15 more
than at 28/2/63, - - ..
•BULI£TIN.
Any items of general interest are always welcome for publication'ill the
Bulletin. Le-b either the Secretary or Treasurer have 'fchem tythe -third
in each month, ^ _ We would be veiy pleased to receive regular notes from the
North end North Westera Zones. IJliQt about it Zone Correspondents9'
H A MFE S T SA T U RD A.. Y AND S U N D A. I. 2/3 NOVEMBER
The VJirelsss Institute of Australia. Tasraanian Division,
October 1963 Monthly Bulletin. Page ;5
TECHNICAL.
Tw>Me^re Tranr-iis'boi* Suer-re^en Receiver. W. Emme'fc'fc VK7ZA .
A-fc the coming ianfes-b it is intended. -bo conduct. 2 mx -bransmitter hunts
on foo-b in conj-i-m'ction id.th a nu.nia-fcui-e -bransmit-ter. To par-bicipa-be in -fchese
and o-bher activi-bies you'll need a 2 mx portable receiver. The folloid-ng_
receiver is ideal for'the job. In the past i-fc bas been the custom to enploy
valve type superregens^ With the advent of transist. ors i't^s decided -to build
a bransiE'toriae, :l ve"_"sion to overcome the size, weight and bat-beiy drain of the
valve •types,
The uiat d.escribed performs very well^ is small, light in weight. and is
simpler tc bui3.d than i-fcs valve coun-bQrparts. The cost is about £3 ~ £4« No
2 r.x -bransist-o-" wjcer-regena seem -to have been descri'bed, so -bhe final design
VQS arrived at ty experimenting with designs for other frequencies* An
inexpensive OG3.71 transis-bor is used as the super regen detec-bor and spems to
work quite vrell up to abou-b 200 mc/s. The design is therefore suitable for use
on 50 rne/s and other frequencies in the regiono
Feedback froni erai'-bter to coliect. or is providedty induc-bive coupling^
be-uyeen V. c.nd L2, wliich are both tmed -to the signal frequency by_01 gnd^G2.
I.fai.n tucu. ng is by Ql, adjus-fcmen-b of 02 controls -fche amount of feedback. Two
audio stages vwe used in -the prototype driving low impedance disposals •type
phones, For high iinpedance phones one stage may be sufficient, raodificeebions
being shoi-m,
The'iini-fc was cons-bruc-fcedon a piGCQ of matrix board 7 holes Ty 3" long*
Philips t^L-ara2r;3 (3 - 30 P?) i';Qre used for -bum. ng, coupled •to a piece of p*y*G*
varisU. o condensGrs 20 pf wuld be ideal provided the
tubing. Any sr r:^ll or so
Gi^,e was ;:jicU and -tho insul-a-tion ceraniic or equivalent. The layout of_the
detector is net. '-ary critical, tho i^sin requirements being that, Li and L2zare
parsllc:. ar.d all-l. c;^<.s as short and direct as possi'U.e. Layou-fc of audio stgges
ia ro-L crlt.-'-c.al. The 'ariFEers sre mounted ver-fcically w.'th gppropria'te holes
erJ. 3r3:!3d. t, o pas? the -brimner l-a[;s, Tho coils are raoun-fced on the opposite side
of the board -fco the •trimmers, and are parallel i-11 apart*
The r.'ecciver r-'ay bp ins-tallsd in any suitable metal caso - in -fche case
of the Fi-ot. ofc.y?e.. Uij. s ^as 4'' x ?liJ r. 2i". A 5" x 3" chassis ^would be qi iite
'
ST-LLtobl'e., So;'r. o raeanp must be aade for providing, variable antenna coupling.
The coupling coily a Ringle -burn loop c.ould be noim-fced on an insiilat-ed rod,
supported in sn old pot. bushing in -fche front panel,
~<|—fpB5[{^ 9 volts
1 . 1. """^YRJ. IOW
I J'llis€"
5, 61^ g| i Green
>R^^j::^00/^7
^?-270k ^
15P. <
1<-';.
> I . ^' ^ r"—"^
^. L^ 3
m-h';>-
^A^t.
c.< ,**"'.
56k ;3. 9k ^/
K ^ LLL^,^ ^]J':'"—
Mfd- ^T-'L ^""••^
17 -l"L- -+\-^\ ~L
'r\. ! K\y 10'rafd
3 v. w.
I
100 mfd
10k
} 1. 2k
T 12 v. w,
.._(Pos)
-Jk
.
OC171 OG7L OG71
0.1, 02 -. 3 •• 30 pf PKl-t-ps •fcriij'mers,
LI' 3. -turns Ho .. 18 ^ dia.o x •i" long,
L2 t8'' No., 24 closewoui-id t" disni. (wi-u-id on high value 1 wtt resistor or
other s uitable former. ^Continued pa ge 4)
SEE THIS RECEIVER WORKING AT THE ^MFEST.
Tl^s ^Wix-Gless Insti-fcutc of Australiac Tasmanian Divisione
Oc'bo'Der 1963 . Monthly Bulle-fcin Page 4
T^ro__Metr^^Super_^egren (Gon-fcinued)
For lu. gh inpedance phones substitute phones for 3, 9k in coLLec-fcor circuit
of firs-b OG71,,
Tl ^ Transistor irit6rstage transformer (minia-bure) 4000 ohns to 2000
ol-ms G. T. (Type JB'R 27)
All, rssis-fcors -^ wa-b^a . ., 0047 gre disc ceramic,
If regeneration control-'desired, add 0, 5 neg pot as below :
9 v. eg,)
0»5 meg pot
•^
150k
OCL71.
6. 8k
p)047
Mju^stjientp :
Thj. s is facilitated ly the use of a signal generator coverii-ig 100-200
mc/'s, . or with hanaonics in this region, as the pro-botype tuned froin "about, 100 -
190 EC/Sa Despite the id. do tuning range the receiver •WEI s ©asy to -fcune wi.th
vi.rtually no hand capaci'fcyo An. 8 pf PIrLUps •fcrismer if available wuld giTC
a slp.wer tiuung ratRt,
With a 3 - 30 pf 'tririiraer 144 mc/s should occur -idith Gl tvo thirds out.
With Gl in •fclu. !? posi.-fcion 02 is adjus-bed uA-fciL the circuit coiaos in-fco oscillation
as evi. dc.nced ty •bhe fau-i. Uar superrogen hiss. (If a •sig, generator is availalxLe
the 'I're^unncy cgn I?R checked and GL adjust. ed as necessaiy. 02 will^ have •bo- be
chn. ngod. every 10 rac/s or .sb to keep .-bhe circuit oscillating,
If for any part. ic1iLaz* setting of 01 -bhe detector does not oscilla'fce'
throngnoiri •fch^. -gKgo of _G2 either (i) 02 12 are not •fciming to the signal frequency
or (i.i.) 'base bias insufficien't,. 150k resistor must be reduced,
'L~e-:-':, hw of these steps should be necessaiy,
O^cs +'he band is fouiia., a nodula-fced signQl, preferably tone, is tuned in
and 02 adjusted for cleanes-b' audio sigiial. Adjustment of G2 will detune the
•"eceiver ali. gh-';ly so tha-b reado'ustment of Gi may be roquired,
SPUiTTER ty VK7123;
-.. -_;^be follo^g^ls sorae"blu. ng for which I accept full responsibility, I also
mst confess that VIC70'H advisad ne agains-b it, refusing"to piay~ary~parfc>'^atso^r.
.
^lo-J-'ost. Jt? - - - . .-
^.^/.MOnsier. D!Emrleu cr. l^ouche(TbThInd the ^dieel of his large black limousine.
on x-eaciz-Lng a^aost inporbant meeting outside the tozm of~'Stonehold. Beside'
^n^he sea'b.. o?.,bhe car/. lgy a. sinis-ber"black box -
the'purpase'o'Fhirv isi'fc."
r'urther^o^the north, at -bhe appointed neeting pla'Ge called^l<AkZn«s~Hali sat~a'
group of ^electro^c experts, irnpg-fcien-b^ witing to exar.iine our~hero' s~i^eni"(
^~ ^cgpa ble^ of transmitting in-fcerLigence ^thou-b wLres. ' -- - -"°"
Suddenly^-fche black car screeched to a stop - Monsieur'D'Emden ws lost.
:a4. a.LS'fcrSngecount17 wi'1J h to tm'n t0'
no 'Out'of the~shadows ro^e(itla"locar-
one
!irterJ^f!w-. WG11'chosen. TOrds our hero was dj-^c^od to a haU a.pproxlnately'200
Ki-om^ers away^- a mee-fcing TOS in progress - -bhe Tom Brass BandJ Further'
^set^hija on a course to another rendezvous - the Ro'tailans..'~'The
'ynls. oni7, "radl° ac-fcive cab" suddenly appeared, "thc'driver. waLl'i^ienced. in
"setting a course". Away went'our friend, only to find'who re "there"
sho-ald have been a right hand -bum there wsn't,!
To finalj.se, -bhs local "cop1 1 crep-fc in the story somewhere where I am -
fflre::~. eye ntual:L:T °'dr friend homed on-"bhe co^ect ^H'- how--~Qgain-i''an not
?3UI£i — Q£iiC i'U.IUq
The facts revealed in^-bhe story are -true. Only the nanes ha-ve been
-bo pro-bec-fc the innocento
Pleased to see your photo, worid.ng'during the R.D. in the local Bumie
paper, Sara - given up sacking"?
(Sony Tod run ou-b of spacei VK7GH) 73
OhaseHarrisson VK7CH
for Bulletin Corami-b'fcee
The Wireless Institute ot Aus-tralis,, T&smanisn Division.
Ooto'ber 1963. By the "Voice"
V. H. F. SUPPU-a'-IEt^T.
STOP PRESSo FURTHER FIELD TESTS BY THE DESIGNER OF THE SUPER REGEK,
RECEIVER DESCRIBED IN THIS ISSUE, HAVE SHOWN THAT AET 8PF TRIMER IN THE
COLLECTOR CIRCUIT IS DEFINATELY PREFERABLE TO THE 30PF, SEP WERE NOT
AVAILABLE AT THE TIME OF CONSTRUCTION OF THE ORIGINAL UNIT,
V/oll, another month has rolled by and Xm&s will soon be wi-th us.
As you all proba'bly know, the Rain Fost is -bo bo hold over the first
weekend in Bovcmlj er, which is not that far off, so ou-b with the mobile
equipm&nt arid. lots malco this even more of a success than i-b v/as last
year. From -the sound of things, most of the chaps from dov?n south v/ill
bo -there and we are all looking fow&rd to mce-fcing members fro the north.
BA-TO ACTIVITY?
50rncs. Still the usual crew ac-tivp on this bar. d in -the south, No nev/s
of activity from the north.
lA4mcs, We arc very pleased -bo welcome -to our ranks none other than
I B2i (Ramble On) Nichols, 7ZZ. lan is running 20 watts output with an
832 anA dragging ^ RF from all around tho -town with a Nu-Vista converter
which ie mounted on the transmi-fc+. or chasis. At the momcn-t a 4 element
ya;?i boamed on the Mountain is in uso but lan hopes to have a fully
ro-bateablo 10 olemont jo'b around. Xmas.
Rick, 7ZAT, has been quite active of la-bo on 2, Nice to hoar you
about again Rick. Another'station heard more of-fcon la-fccly is Loo, 7KG.
Edgar, 75Y, is now on the 'band a1 so on 144. 625 ?ind is using a super
re gon. receiver,
Mr. W. Nickols has been appointed. VH1?' officer for the North Wes-b
Zone and no-beo fro'-n said ".one will occupy this position on the VHF page
from now on. Very nice -bo hoar from the "ooys up -the ro and. pleased- to hear
of the activity alco.
NORTH WEST ZONE.
A"b the lQ,st iseo'bing on Septenfeer 7'bh 'bhoro was much interest shown
in the 2 meter commuiiicator domonstratcd by Goof, 7ZAS. Good to see you
Goof,.
Frank Ric'uelno, an ox PAO, has moved from Burnie to live at
Smi-fch-fcon aiid. is nc<? v/orking for the PMG &t S'fcanley. Af-to so-fctling in
to his now rcsidsncc, Frank will sit for his AOCP exam.
Terry, 7TT, is ozpcrimon-bing v;i-fch a single, •tu'bo 2 me-ter walky-
talky and. Bob; cY<:BAA, is modifying his 522 rcccivor and. is considering
using a -turret tuner -to change bands. Harry, 7ZBH,, would liko -bo go
mobile on 2 but canb afford a crystal, Hi.
73, V. Nickols, L7015.
NEWS IN BRIE?.
Wins-ton, 7ZAP, is now married, and s.t the time of v;ri-ting, is on
his honoyincon. Bes-fc wishes from us all OM and all the best for the
future
SEPTEMBER MEEmING.
15 mom'bcrs a-b-fcondod and although -fchore was a lot of discussion,
not much business was on hE^nd. The me.in i-fcom of interest v/as -the 420mcs.
band. It appears that the Gon-blem&n's agroomcn-t will be, Mod, Osc's.,
piilse etc up -bo 432 mcs, 432 -bo 436 reserved for xte.l locked opora-fcions,
c-f'clusivoly, and TV oporp.tions con-fccring on 440 mcs.
An item of interest was brought to my. notice by one of -the mem'bers.
Tha-fcis, that the firm of Philips in Hobar-b have supplies of ceramic con-
densers from 8 to 50FF. The firm is only -boo pleased -to help Amateurs,
&iid. will stock sjiy i-tem for which there is sufficicn-b (iomand.
The -?es-b of the evening wos dcvo-fcecL -bo studying -the construction of
-the super rogen» described in -this issue. VlTilf's v;as c&rcfuly scrutcnised
for ideas, ejid the uni-t was fired up and tuned to a signal from a trens-
is-toriscd transmi-b-fcor, which I believe is to bo used for short range
fox hun-bs at -bhc Hsm Pest,, The sugostion in tho s-bop press s.-t -the head
of the page is recouicndod, as tuning ie. s. li-fc-fclo difficult wi-fch -the
30FF trimmer. The 8PF gives a tuning range of 140 to 160 iacs., wher&as
•the 30PF covers from 120 to 160 racs
Thaty all for -this month, 7 3's
Mike Jennor, VK7ZAV.