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;T. H ,g,, •^, I, a.^,^;E S S .. I N:» T I T. U T E
OF AUSTRALIA
,.., . TAS^ANIAN.. DIiVISION
MDNTHEZ BULUETIN JUNE 1962
' v-:-Boy'^51J G. P. O. Price 6d«
. HOBAICT.
PRESIDENT -•• • ••-^•••i/; - 11EEASURE21: - SEGREPAEX
Mr, T. Alien Mr»C,.HarrissoA Mr. K, MUJLin
VK7AL, . • VK7CH.. VK7KA--•-•• ••-
. Registered at,.the G. P. Q*, Hobarfc for •bransmi. ssion ly post as a periodical*
GENERAL MSEIING. . . ' •'
, , ^heri^-mon-b'hly meeting'-wt'It be held at ^T Channel 2, 30 Harrington
St., Hobazrfcy on ^eDNESDAI:, 6-bh June at 2000 hours. Our lecturer this month
will be Mr. T. Moore;.VKTFM axid Ms subject "Video Tape Rscording",
NORTHE ZONE .,.,..
Next meetifa-g of- thip-Zoi-i? •will be held at the residence of Mr, P,Frith
VK7EF, 181 Punchbowl Rd,, Launce-sion, on FRIDAY 8-fch June. ' A lecture loll be
given by Ifr. Alf Cooke, but hi?'subject i^ not knovn at present,
" The Zone'-Secretaiy advise? that attendances at me etJLngs lately have
be@n very good, ?nd tba-fc ^vo prospective members are -si'bting for- tfaeir A..O,^P»
in Ju3,7. " '- • ;,.. *^, •-
•-"• ••
NORTH WESTERN ZONE. • <• . .•_. ,...
. ,. The, clate,,of tbe next meeting is TUE3DAI 5'bh June at the usual'mSeting
placfe-LarfciilS Hall, *Ulvetr s'boftef« .
» ••• s. • • •• »
SUBSCRIPTIONS. •• ' " • "'l' '
There are still many outstanding and if yours had not been TOceived
by. 21sy Ifey. the amoun'fc owing is shoxm., below* ;A prorapt rffttittance would be •• : -
appi^eciated. • '" ' " ' """ "' '' ". " ' * * "
t::tStii:;S:::^:!:::t::::
:»::i;$s:;t:::::i:::i:S
»' . ' • • '..••. ^. .--,•. ^v.-ii.., \ . •• • i -^
I
Sin6e:biir last 'bulletin up to 21 st Kby •the Treasurer acknowledges ,
receipt of subscriptions' froffl -the f6U.ouing ; ,
VKTBT" VK7SM ZL3BO . VK7I"T VK7ZW. VKTiQC .VK7K5 VK7KS VK7RI1! VK7BK VK7RT ,
VK7JF W7MX. VK7XL "VK7WA VK7LL VK7MS VK7ZAS VK7ZA. G Messrs. D. Alien,
H. Young, .A.. J. Baptist,'R. . Belbln, S, H. Bqyd, H. A. Wrigh-fc, G« Vrignaud,
M. G, Hooper, H. P. Sohulz;'.. -A. E. ^y-m6
•
•COUNCIL MEETING-.., . -. "7'.. . " . : - .
, • The June meeting will be hetd a-b the residence of Mr. T» Connor yK7CT
on, MONDM, 18th June, ; QTH is 17 HL.gh St,, Bellerivo,'
It has be'en decided that in future GouncU. : meetings wLll be held on
the, third Monday. in, each month,
WEKLZ BEOADGAST, ~ , - ' ;• • ..
Ttie'BroadcaSt Offi&er has 3'equested -bhat stations calling YK7WI make
sure that they are netted to the 71fil freqAehcy during -fche roimd up on Sunday
mornings, 'VK7CT who'rSbroadcasts the •brQna'nissa. on on 3672 kc/s is alwiys bn
•bhe lookout for calls anywhere oh the 3«5 mc/s bandat ths conclusion of -bhe
broadcast and would appreciate, a call and report,
CLU BOOM FUND; • ' , ^..
Our thanks to Mr, M, C. Hooper for his generous donation to the Club
Boom fund,
AUCTION ..•" .. .. . .. , ,... .. . . ..... .. ..... ... . .., .. , ., . . ,.
T-wo 128 sets in irorking order will be auc'fcioned at> the'coming meeting.
These are very haxidy little sets and this is a good opportunity to get hold of
one,
Page 1
The Mon-bMy Bultetin' of the tireless lasti-brte o£-Australia.
Juiie 1962 Tasnayaan Division' Page 2
PRE UENGI BANDS.
„ We h^ve been advised that the folloidjig frequence bands •uill be
available far use "by Amateur- S-fcarfcion Licensees as fvm. l/7/^S. :
Medium Pre, uenc Band. 1800 - I860 kc/s •
High Frequency Bands 3. 50 - 3. 70. 7. 00. - 7. 10. 7»10 - 7. 15 (a)
14. 00 - 14.35. 21.00 - 21,^5. 26,96 •• 27<23 (e)
28. 00 - 29. 70--mc/s" •
V'-H P.. Ban3s 52 -54. 1U. - 14S,' 288 - 296 (b) mc/s
U H F. ; Bands 420 - 450 (a. c) 576 - 585 (d) 1215 - 1300 <a)
2300. -2450 (a) mc/s
S... H.. F. Bands ^300 - 3500 (a) 5650 - $850 (a) 10000 - 10500 (a)
21000 - 22000,
Notes i {a)
n This"band
The Amateur Service is the Sooondaiy Service in this band*
is not available for •bhe. &mateur Service after 1/7/^3
iii
This-band'availaUe fOip the Ama'beyr Service as from 3,/l/i64.
This band allocated on a temporary basis un-fcil required' ty the
Broadcasting Service
(e) This band is designated-for Industrial, ScJlen'fc^fic and-Medical
purposes, BadioooinTmuni.ca tjon servioes operating wi'bhin the band
must. accept ary'. harmful interference that1 may be experienced ft?om
the operation of' ind.iis'brial, scienti£v3. or medical equipaen.t^
es of Emission Au'fchor'sed.
bands .• »» Al. A3< A3a. A3b« F3 (t3kc8)
All bands above 52 mc/s •» A2, F2, 13
All bands above U4 mc/s ,, ,, AO, F0« PO,
U. H. F. and S. H. F. Bands and 288 -. 296
mc/s band until 1/7/63 •• A5, Pl, F2d, P2e, P2i:« I)3d»
F3e, _I>3f,
P, S, For definition of types of emission see your EMG'Ha nd.bo ol;, . ..
T?' NOTES ty YE7ZEE
ne Annual 'Meeting of -bhe V»H»F. Group was held on Wednesday 16-th. ..May and •
•fche following office bearers vere elected t
President №. E. Beard YC7EB
Secretary. Mr, D. Beny VK7ZAI
Vice President, Mr, M. Watsou VK7ZAK
Broadcast Officer Mr. p. Oorty VK7ZA3
Publicity Officer Mr. N. ELsher YK7ZEE
Ac'fctvi'fcies Ctoinnd. 'btee, Mesrs, W. Emme-fc-fc VK7Z&Q, E, Cruise VK7EJ,
G. D'Emden W7ZAS. M, Jenner VK7ZAV.
$2 mc/s - There'is little doing on this band* VK.7ZAI has been hearing some
peculiar, sigs «- presymed -fco be JAs,
144 mc/s' - VIC7ZBE has just returned from Flinders 'Is, He has been using a
"Gommunica-bor" (2" •MEi-fc'ts out) to a 5 element beam, 'He regularly •worked Launces-bon
stations and ai so contacted VK7ZM/P on Ift, Welliiigton, These contac-fcs have
definitely proved the effect&veness of "the "Oomm'unicator"', On' Sunday 13th May
VK7ZAI and VK7ZAL'took gear to the sunmi-fc of Mt. Wellui^ton and wrked VK7ZBA and
VK7ZEE (Oatlands) VK7DK~(Poa-bina) VK7LZ (Launceston) and VK7ZBE/P (EUnders Xs, -)
also VK3ZIU. VK3ZK:Z. VK3ZFX, VK3ZF1, /01,. VK;3s worked were portable above 1000 ft
on Mt,, Donna Bouang. Teiapera-fcure .inversions are prevalent at' this time of the year
and more DX working is contemplated,
Esqserimen-bs -with a passive repeator are neai'feng 'comple'fcion and a unit
is to be. placed on Mr, Wellington to enable DX iniorking wz'bhout" going portable"
Project OSG/i-R, "• Launching is to take place sometime in June. Report forms are
availaTAe from either VK7PF or VK7ZAO, Reports ly QSL card will also be very
welcome. They shoiitd be sent to Box 183, Sunnyvale, Gal., U»S, A«
420 mc/s - Interes'fc in this baiid is apparent and It shoutd be good for
experimen-baUoh as sigs reflect escfcremel^ well,
This is ray first effort as scaibe for the group and Phil, the new Broadoaast
Officer and I are looking forward -to the co-operation of all V. H, F« men to keep us
posted on activities and achieyemen-bs on V. H. F.
R. D CONTEST.
A reininder -that the Remembrance Day Ckintest is next Augast iMch after all
isn't so far away. So s-barb overhauling tha.-fc gear and l.e-b.ts give the VK6S a run"
for it this year* ,, " . ',
The Ifonthly Bulletin . of the Wireless lastitute of'Australia.
June 1962 Tasmanian Dxvision
FOR SAI£
U ly, 60 ma choke S/-. 125 ria fil.ter choke •10/~« Power Trannte 285^-a side •
125 ma 2$/-, OT896 A & R Output Trannie 15w, P. P, 30/-, U30 150 Power Trannie
10/-. OP54 Fergusoh Outpu-b Trannie S, E,. 56oO ohm 15/- Efco Dial 10/-« " •;:-~-
Valves : 6BI7* 2 @ 12BX7. 2@ 5763. 6U8. I2^T7. 6BQ7& all these are new a-b 10/-
each, 6AL$ new-S/-. 2 @ EF86 5/~ each. 2 @ 6AQ5. * -6M5» 6BH5. 6BW6. 6BV7. 6BEf7
all a-b 5/- eacho."2~@ 6J6, 6BM8. 12AX7 all a-fc 8/-'each. 2050 Thyratron 10/-
1R5. IS 5, 3V4. 6/- the lot. OR the lot, plus a fetf odd valves, -for £L2«
Also 4 x 650 raf 275v working'cdndensers for a low volt elec-bronic flash for S3
the lot. Contact • Mr, ' Ifctgh'Hutchinson, Postal address: Ohannel SLgh'way, Taroona*
• I <
•BULIEEIN • . >....
"Further to our note laat month asking for contributions etc. we -would.
welcome any suggestions for improving the butle'tin. Let us have your ideas and
conunenjss pleases We would also be pregarod -to publish any letters to •bhe Editors
concercir^ amateur radio? •topics of in-bereste-bc. These must be sigtied but a
hom-de-plume may be used for publication* . . .
Due -bo -bhe altered date for Cmuncil Meet-ings it will now be neoessaiy
for bulle-bin material -bo be in the hands of either the Secretary or the Treasurer
no later than the third Monday in the month, • •• • • •• •—•-
t - ' • •• ' •••-'• '
A. 0 G P GBASS. • •' • • '
At the last Council Meeting the matter of starting an A. 0. . 0. P. Class
was discussed? and i1;... 1wa. s decided'that If ^fi'cie^..-inte-r&st •va. s-^o-^ '. ••
enough starters could. be obtainQ(itoraake;i±^Mwi;h;.3AiiIe,..:A....cJa.s3^^^^^^
star'ted, Mr, T. Connor 'VK7GT has kindly agreed to act a@ insafcruc^qr, • so now
it is up '-bo you, If you are. i.n.-fcerested please hand.yotir naimo in to,-Mr»; CQprioy^ .•
no la-ber than the nerb mse-bing nigh1/. A nonanal fee may be. necessa'i7, ^;bu'fe_.thi3
should be quite reasanabLe and Toiithin tbe reach of all, . :W$ would; also be glai3, :• .
to hesr of any non niembers that might be Uiterested,
'UESTION BOX» . _ . . _ ... _ ,, „ ^ •
Have you any -fcechnical questions ..•that you would like answered? Well,. ',.,
herd's your chance, A question box will be .l^st-alled in the Club, •Bo. om:-and all,
you have •to do is •write your question on a . piece of paper and le9ve, U rnthe
box ; it need not be si^ed, Thei} at the n©rt meeting we wi.il. endeavour to fiiid
the answer for you. This could, prove most in-fceresting •fco all,. so to get the ,•
ball rolling -bhink up sorae-fcht^g -fcq . drop in -bhe box.
FEDERAL CONVENTION •'• . ^ ........-• . •-
The Federal Convention held in Perth during Easter was attended;1y our .
Federal Councillor, Mr, E. Cruise VK?EJ, ^dio_report s that i^ws a most
successful gathering, the business taking all of 4P hours, The^W. A. ^D.ivision ^
to ^be congratulated on -their'effort. " Tha-b Di-d. sion con-fcributed £300 to^rds
%e cost of travelling expenses. and aU delegates were bLlleied ly •bhe^r;mem. bei?s,
Ted staying vri.th our old friend-Len Eddtngton VK6LS ex VK7I-S« :-:-;.. , . .. .
GILIIBS FOR. CLUB ROOM. ^ ,. .
"^ITa'^e been for-fcuna-be enough -to get hold. pf some really first_c3, ass <
at a cost~of 30/- each, I understand that the N. S. W. Division recentlyappealed
to members to donate chairs for their new Hoadquarbers and as a result a large
numiier were obtained. Should any of our:members feel like donating one- . these
chairs we certainly will not refuse the offer. I
SWiP SHOP (Idea lifted from the N, S. W. Division Bulletin) ^ _ _ _ . _„ _j,
TrG'you ever in need of some particular piece of gear and finding
short of -bhe necessaiy to buy it, or perhaps i-b cannot;_be bough-fc, although^y6u^
have'pien-fcy'of'o-bher surplus" bits ,and"j)ieces?. WeU, if so^-bry a swap notxco tti
the bulletin^ These vjill be inserted free of charge and mil serve -bo put . '.
in'fceres:fced-parti@s in touch vith one another. As^a_starfc yK 7GH xrents a ^^t^l_
somewhere'between 1750 and 1820 and wiU swap a 5850 and either 7025 or 7050 for
same*
CILINGE OF i-iDDRESS
If you change your address please ad-vise the. Secretary promptly and NOT to
"Amateur Radio" direct,
®he Mbn-feiay ^Bulletiri M the WLreless Institut-e or Australia
June 1962 Tasraanian Division Page 4
TECHNICAL
S x etre E ui ent. Contributed by R. Emmet-fc VK7ZAO. Continued from last mon-bh
Ad ustmen-fc, . (i)^Insert meter, a-b X and -fcune 03 for a dip in .plate curren-fc.
(il) Touch a piece, of va.re on to Y and tune in a H»F. signal
within the I»F, tuning range, and tune slug in L5 for
maximum signal,
(xia. ) Wi'fch'V. H. F, aerial comiected peak Cl and 02 for maximum noise.
(iy) If oscilla-fcion is apparent in R. P. stage detune 02 slightly
(v) If any problems, or to supply a test signal, contact YK7ZAO
» of aiy V«H»F, Group member,
Serial A 3 element beam with 1^' diam, dural bsom, Beflector 116" Direc-fcor 105°,
Spacings of each element is 35 inches.
110"
^- i-" diara. copper tubing
^- 1/8-bh" " "
3-00 ohm
Transraitter. Any^standard design, e. g, 12AI? multiplier to 6BW6 or 705 final
or 6BW6 plus 6BW6 multiplier, 6146 final,
Avoid following crystal positions : 50. 1. 50. 12, 50. l6o
H T TOWER SUPPI2 USING TRANSISTORS M. J Macdonald VK6MM.
With acknowled ement to W !-. -M.'vision Bulletin 1 62.
_. severa:l variat:i. ons of ^ to DC power supplies using transistors for
been published, but m6 st have -bhe ma.ximum possible~poirer-outpu-fc
.
and^ efficiency a s^primaiy design requirements. Iho mit here described has been
with initial in^nvnym cos'fc in mind,
For^this reason •bransistors 2N301 and a voltage doubler circui-fc are used.
current rating'limits the safe output power to about 30 MQtts D. G.
_y°?rl bage rat'jlne means 'fchat the load should'not*
be entirety removed'because
Odyced
?? .c?¥lec?,or"*base ^e?k dow?* This is due •fco the excessivo"voltage'
imder these condj.tions* Gomnon collector configuration'is'used^'
pT
.
The diagram shows the collectors coimec-fced directly to the chassis which '
goes to -the negative side of the 12 volt supply. By "The Law-of-~Gussedness""raost
have^pos^ye to ground; this can be overcome ty various'method s Fwhich'
^1. Mj,ca TOshors under the transistors. 2. Lfount the" -bransistors on'a'
separate heat svik, _insula-bod from the chassis. 3. 'Insulate the"chassis"from the
4^ Reverse the entire viri.ng system of the car to positive"earth,
;• Trade in your old car for one with posiUve" earthed alrea^-.
Ifethod one and two should prove to be of mos-b use<-
Detaj'18, des
t B2.4t7'ohm. 2w* li-I^^s the'base curren-fc. Check~iy'voltage across R2^
a.,. pro-n. foruard bias to start oscillations. Use a lower valuri f's-barfc "is
^reX4,ab3^,^Oper^ing frequency is about 1200 eps. Rd.pple^on'pro'totype'TOs about
t^ i, e, wider 1% ripple,
^Unit, vas tried out on an AB8 receiver. At 150 kc/s the hash TOS severe.
was_barsly heard on -bhQ. lower BG frequencies* No'extra"filtering TOS deemed'
aeaegsaiy for aiaateiir opera'fcion,
.
//y/7^3
<?/1 ?;(?'•
Kt Kf.
.^ 0 'S +-
^-<
^SOI
^T ^00 T* 0(5
^ y- KL 390 ohm, Iw,
-D- '0( ~/00 B2 4*7 ohn. 2w»
± '~~!<|-
r" ^oo<^
)^v
73
Ghas»Harrisson VKPCa
For Bulletin Gorami-fctee