QRM
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Bulletin issued by the Northern P.0O. Box 1010
Branches of the Wireless Institute Launceston
of Australia, Tasmanian Division. Tas, 7250
June 1976
Vol.6 No.3
|
Registered at GPO Hobart
for transmission by post Price 40¢
as a periodical, Category B.
MEETINGS
June 8th North West Branch, Lakins Hall, Ulverstone. 8 p.m.
June 11th Northern Branch, S.E.S. rooms, Charles St. 8 p.m.
Y.R.C.S. MEETINGS
June 12th no class due to school holidays
Tol ol
June 26th Kings Meadows High School, 10 a.m.
A.0,.C.P. Classes
June 7 & 14th no classes due to school holidays
June 21 & 28 Kings Meadows High School, block B, room 35
CW, 7.30 p.m. and Radio theory at 8 p.m.
CONTESTS
June 5-13 Townsville Pacific Festival Contest
TT
June 12-13 RSGB National Field Day
June 12-14 Midwinter Field Day (VHF)
June 26-27 ARRL Field Day
July 24-25 ARRIL Bicentennial
June 1976 Q.R.M., Page 2
Notes from the Northern Branch by Norman VK7NR
The chairman, Brian VK7ZBY, and 33 members attended the
May meeting of the Branch, with apologies being received from
VK7's TE, ZAX, LZ, KW, ZWW, H.Skegg and J.Allum.
Reports were received from all officers, including a
comprehensive report from our Federal Councilor Peter VKT7PF,
on the recent Federal convention held in Melbourne,
Peter VK7PD presented the following trading figures:;
April Sales $983 May Sales $ 359.00
Income $146 Income $ 17.50
Cash at Branch $885 Cash at Branch $1262.00
An application from Max Fraser, for associate membership
was presented and approved.
John VK7JV is still looking for articles for QRM and
this request includes items for the Ladies Page, so what about
it
The 1976 Hamfest will be organised by the Northern Branch
under the leadership of Lindsay VK7ZLD, who will be expecting
4 or 5 volunteers to help him out. He is particularly looking
for new ideas and perhaps some of our younger members can come
up with some. Why not tell Lindsay YOUR IDEAS ? The dates,
November 13 and 14, the venue is Evandale, provided the hall
is available,
Peter VK7PF offered his services as Repeater Co-ordinator
for the Branch, His offer was accepted.
One thing I forgot about the Hamfest was, an offer by
Joe VK7ZGJ to come up with a "Sniffer" for Foxhunting that
works.
A suggestion was made that perhaps we might put on a
display at the next Launceston Show, your Hon. Sec. will
follow this up and advise accordingly.
Also a request was sent to the Superintendent of the
Radio Branch to change the Branch call sign from VK7NZ to
VK7NB. This change of call sign would, it is felt, be more
in keeping with our new constitution.
And that about sums it up for this Branch meeting, which
was followed by a couple of interesting films, courtesy of
Wall VK7ZWX our Lecture officer.
One final comment,
last months QRM contained a form
asking for members views on Club rooms, some were returned,
but not enough for your executive to fully ascertain your
needs. To those who returned forms, I say many thanks for
your interest, to those who have not yet returned them,
please bring them to the next meeting or post it to Box 1010
Launceston, or give them to any member of the executive, or
any member you know will be attending the next meeting at
the S.E.S. rooms on June 11lth, 1976.
73 Norman VK7NR
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Notes from the North West Branch. by Lindsay Johnson
The monthly meeting was held at Lakins Hall Ulverstone
on the 11lth May. Although the weather was fairly cold a good
attendance was present, some eighteen in all (with the assoc-
iates again nearly outnumbering the full members.
The president Ian VK7ZIE and the secretary treasurer
Max VK7MX were in the chair. With a good turn up of Devonport,
Latrobe, Burnie and Wynyard members and only four associates
from Ulverstone. The meeting went off very well. Graeme VK7ZAQ
reported that the new 2 metre North West repeater, being situ-
ated and installed on a site behind Lonah (which is between
Ulverstone and Penguin along the old coast Rd.) will be opera-
tional shortly, on short tests given recently, it was found to
be a bit of a fizzer in some parts and o.k. in others, so it
looks as if Graeme and his worth while assistant Ivan Lamberton
will be burning up the midnight o0il again to rectify the
troubles, knowing of Graeme's knowledge of electronics we are
sure the troubles will soon be overcome and all 2 metre opera-
tors will then get a good coastal coverage,
Towards the end of the meeting the secretary treasurer
was busy collecting subs from members for QRM, by the way the
subs were coming in I guess most must now be financial., The
meeting closed at 9.45 p.m. and was followed by supper, the
Burnie members being the hosts and doing a very fine job of it.
Following supper Graeme VK7ZAQ held a mobile clinic with
his frequency counter, which went over very succesfully and
created much interest as was shown by the amount of rigs which
were brought in by members for Graeme to give the once over.
I think this an opportune time and place to thank Graeme for
all the hours of voluntary and untiring work he donates to us
here in the North West Branch and else where.
Following the mobile clinic there was the usual after
meeting discussions and the meeting was wound up at 10.15 p.m.
But this was not the end of the evenings outing for some
Devonport and Latrobe members who on the way home called in
on a Ulverstone member who had recently purchased a movie
camera and had just received back his first ever home made
movie,The visitors were privileged to be able to see the premier
screening and had to admit, not bad for the first one.
o sk de Kk % ok de Kk e de vk vook ko ke
Two Wynyard members who are very active on 2 metres are,
Kirby VK4ZGR/7 and Brian VK7ZBL, Brian, who has purchased a
welding plant, is in the process of designing and building
a tower, from what he tells us, when it is completed it will
be the answer to simplicity in erection and strength, good
luck with your project Brian, we are looking forward to yet
stronger signals than your already strong ones,
Kirby VK4ZGR/7 is also very active on 2 metres and is
being heard mobile from different parts of the coast or his
QTH using the ZIE special aerial and putting in some quite
strong signals.
Definition,of a half wave. A greeting to someone you don't
really like,
June 1976 Q.R.M, Page 4
HF notes by Frank VK7BC
A general improvement has been noticed (or imagined)
this month, with the band remaining open a little longer
than of late. Multipath echoes have been observed quite
often during the past 2 weeks on 20 metre CW signals, which
in itself would indicate an improvement in conditions. The
10 and 160 metre bands have not been monitored this month.
QSP For those old friends of the Rev, "Ham'" VE3BWY.
Ham will be in VK for a period of three month
commencing 22nd of November. The first three weeks
will be spent in VK7 where he will be quite QRL with
the business of his calling, however he is looking
forward to some eyeball QSO's with his old contacts.
More later.
New Country, St.Paul Island, VY@ in Cabot Strait, approx.
47.20 N, .
60.10 W,
New Country, Sable Island, VX@, 44.00 N, 60.00 W,
Col VK7LZ was the first VK to get St.Paul Isl. followed
by VK7BC and VK7DK,
Now that Col is full time operator at 7LZ there will
not be many DX plumbs that remain on the branches for long
and we can look forward to seeing him right up on top of
the DXCC listings.
QSL's XJ32Z/I St.Paul Isl., via VE3BMV,
VP1BH via VE2AKZ
ZF1MA Box 459 Grande Cayman, W.I.
CT2BS via WA4CAD
VP5SF via WB4SHB
YJ8AN wvia Box 219 Vila.
80 metres 07002 - 1100Z. CW, VE1ZZ, W1EWD, VE2BPT, CO2JA
JA's and ZL's
40 metres 05002 - 1000Z. CW, YJBKG, W1EWD, CT2BS, VPS5SSF,
YV3AGT, VE2EGC, W2AIW, VE6CCM, VE1AXT, G3RTE,
XJ3ZZ/1, KH6GI.
SSB, VESRA, GS8PY, G3RUV, W's and VE6/7's.
20 metres 0001 - 0400Z, CW, 9N1MM, HC1XG/HC8, ON4FL, G6ZO
ZF6eJL, SM7DLH, OH2BAH, PA@NYK, G3SGQ plus all
mainland and USA,
04002 - 08002, VE2LI, VE3BQL, F6CGU, plus W's
SSB, 0200Z- 0600%, VK@LD, ZS1J, ZS1AU, ZS20M,
ZE6JL, VQOHCF, ZS5LJ, ZS10U, ON4FL, ZF1MAa,
KJ6CF, VE4BD, VES5BX, VE7DTA, YS1BW, VE@MCD,
I1BJU, G3RTE, CE@AE, VE8S8AM (Yukon), KS6DV,
YJ8AN, VR6TC, VPIBH and W's.
15 metres 0100Z - 04002, SSB, JA's, WB5KRU/4, W50FY,
ZS5LJ, 2S20M, VS5DB.
73 de VK7BC
June 1976 Q.R.M. Page 5
T Tl olo ol oy walo ot e
VHF notes by Joe Gelston VK7ZGJ.
To date there have been no openings on 6 metres, the
only contacts being local ones.
The 6 metre beacon was switched on at 1530 hours (local)
24th April 1976. A little trouble was experienced with RF
(7EX) getting into the NE555 timer, the unit now idents every
20 seconds, after RF bypassing the timer circuit.
The beginning of the month commenced with a very good
opening to VK3 on 2 metres. The first indication of the opening
was via the Melbourne FM station on 012.7 Mhz, it was S9 for
several hours and audible for two days.
Between 09.52 and 12.27Z on 1 - 5 -'76 both myself and
Kevin VK7ZAH worked Vk3's, AKC, YJU, 2ZXO, ZQV and AZG, the next
morning we worked VK3ZQV again, all signals were R5 and strengths
varied from S1 to S9.
This is all I have for this month, dont forget to listen
for the mid winter DX openings on 6 metres. ChO TV is one of
the best indicators of a band opening, also keep a listen on
the beacon frequencies (listed in A.R.).
73 Joe VKTZGJI
000000000000000
Jottings from Lindsay Johnson.
Tony VK7AX is busy laying tiles we hear and is becoming
somewhat of an expert, but with all of Tony's activities he
still finds time to be an active,on air, member, he is doing
a good job with the rebroadcast of the Sunday morning news
broadcast.
I would like to mention the lot of the Sunday morning
broadcast officer, he is the chap that goes on air every Sunday
morning for around thirty minutes with news of what is happening
around the various Branches, and all of us sit back and listen
to that broadcast, in fact, we look forward to 9.30 a.m. every
Sunday morning. But do we ever stop and think of just how much
time, effort and phone calls go into making this broadcast
possible, that is us, who have never prepared or done a broad-
cast and very likely never done anything about channeling a bit
of news along to the broadcast officer. Remember one phone call
from you, is little compared to a dozen or more from him, trying
to seek out the news. It would be appreciated if he could have
these bits and pieces of news at least a day before, giving him
time to sift through them and save that last minute rush.
% % % e Kk okokokok okok ok kok
WANTED WANTED WANTED WANTED WANTED
Bill VK7TE requires a crystal, any of the following will do,
3.5 MHz, 4 MHz, 7 MHz or 7.5 Mhz, If you can help please
contact Bill at 44 Mayne St. or phone 262297
June 1976 Q.R.M. Page 6
SHACK CLEARANCE SALES
Printed circuit boards for FM building blocks as per A.R. 1975
TX and RX $5.00 each
Remote control unit RC1A $12.00
Various variable capacitors, from 30¢
19" rack c/w power supplies AC & DC , control panel for AWA
UHF Dbase station $5.00
2 Miniphones $1.00 each. 2 - 12" speakers 50¢ each
pair of bookshelf speaker enclosures $45.00
70 MHz Pye A.M. mobile -~ free
Plus many other bits and pieces
Joe VK7ZGJ, phone 443882, 40 Lavender Gr.
hhkhkhhkkkhkhkhkhhkkhhkbhhhkhkhkhkhhhkhhkhkrhkhhhhkkAkkkhhhhhkhkdkkhhhdkkkkhddhkhhkdk
FT200, home brew power supply, all 10 metre xtals, transverter
52-54 MHz with xtal oven $350
VK3ASC spider quad hub fitted with new bamboo spreaders $30
MR6 converted to 52.525 with xtals $25
MR6 converted to 2 metres without xtals $15
Malcolm VK700, phone 441848
hhkkkhkdhkhhkhkhkdkhkhkhkhhkkhkhkhhkhrhhhhkhhhkkkhhhhkbkhkhkkkdkkkhkdkkkkkdkhkkhkhkkhkkkk
FT200 spotless condition, complete with AC power supply $300
National NCX3, 80-40-20, SSB rig with home brew power supply $130
6 metre Belcon Liner SSB and AM $200
2 metre Belcon Liner SSB $200
6 metre IGL converter, xtal for 28 Mhz I.F. $10.00
2 metre IGL converter, xtal for 28 MHz I.F. $10.00
4KD6 valves (FTDX400 etc.) new $4.50 each
4-6JS6 valves (FT200 etc.) new $4.00 each
4 sockets for the above, new $1.00 each
2-6883b valves (12v 6146b) new $3.00 each
Dow-key coax relay 12 volt, new $10.00
9Mhz Pye crystal filter with USB & LSB xtals $20,00
3 TV sets (B.W.) not working $5.00 each
2 sets 6/40 anode clips $1.00 per set
6/40 valve sockets $2.00 each
Peak 1 amp DC meter, type KR65 $5.00
100 micro amp meter, type KR65 $5.00
65ft. UR67 coax cable (used) $4.00
90ft. UR67 coax cable (new) $8.00
50ft. 70 ohm coax cable (new) £€3.00
Norman VK7NR, phone 272928, 11 Fort St. Riverside
continued on Page
i )
June 1976 Q.R.M. Page 7
More 9£_7NR‘S SHACK REMODELLING SALE,
Transformers
2 x 12.6 volt @ 2.5 Amps $4.00 12 volt @ 5 Amps $3.00
1000 volt @ 400 mA $5.00 50 volt @ 200 mA $2.00
500 volt @ 400 mA, 280 volt @ 200 mA $5.00
285 volt @ 80 mA, 2 x 6.3 volt @ 2 Amps, 6.3 volt @ 2 Amp $2.50
285 volt @ 100 mA, 2 x 6.3 volt @ 3 Amp $2.50
50 volt tapped 40-33-25-19 volt @ 2.5 Amp $3.00
2- STC TA20 hybrid audio power amps $5.00 each
.
Stereo pre amp board complete $6.00
TAA300 amplifier complete $3.00
A.M. tuner module $3.00
Vernier slow motion drive $2.00
2- 11 pin plugs (FT200) $1.00 each
2- Tag strips complete with 6-RAS 310A diodes
and 470pf, 5 Kv capacitors $3.00 each
oo
10 Henry 200 mA choke $1.00
6 x SL640 I.C. $2.50 each 4-6"x3" PCB 30¢ each
2 X .SL621 TI.Cq $2.50 each 2-5%"x3" PCB 25¢ each
2 X" SL610 .TI.C; $2.00 each 1-6"x3" dble sided 50¢
1 X3 8L612:T36% $2.00 1-12"x6" PCB 50¢
1 x AWM1306 $1.00 2-5%"x4%
" heatsink $1.00
5 x TAA300 $2.60 each 1-11"x3%" veroboard $1.00
2 x LM380 $2.00 each 1-5"x2%" veroboard 50¢
6 x 2N3005 trans. $1.00 each 1-4%"x3%"x1" die cast box 80¢
2 x BLY90 $12.00 each 1-4%"x2k"x1i"die cast box 80¢
2 x BLY88A $7.00 each 1970, 1972 ARRL $2.50 each
Set of 4 transistors for 432Mhz P.A. $50.00
432MHz transistor PCB $4.00
230 volt AC relay, 3 c/o, 10 amps per contact $2.50
50 Watt F.M. power amp. complete, 12 volt $50.00
12 volt in, enough out to drive 6/40 base station $10.00
A.R. power supply 4.5 - 12 volt 5 amp regulated $12.00
4- 220 mFd @ 350 volt electrolytics (new) $1.30 each
00
5- 100 mfd @ 350 volt electrolytics (new) $1.20 each
Various miniature 12 volt relays and much more, come up and
look, bring your cheque book.
Norman VK7NR, 11 Fort ST. Riverside. phone 272928
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June 1976 Q.R.M. Page 8
PRACTICAL DESIGN OF SMALL POWER TRANSFORMERS.
by John Simmons of the Launceston Technical College.
The first consideration in the design of any transformer
is the output. The output is stated in so many volt-amperes,
because in alternating current apparatus, the produczt of the
volts and amperes does not always give the true watts., Where
there is more than one output, the total output is found by
adding the seperate outputs.
e.g. A transformer is required to have three outputs.,
One of 6 volts at 10 amperes, one 100 volts at 0.5 amperes
and one 20 volts at 1 ampere,
6 x 10 = 60 volt amperes
100 x .5 = 50 volt amperes
20 x 1 = 20 volt amperes
130 _volt amperes
When the total output of the transformer has been
determined, the next consideration is the sectional area of
the core. The core of a transformer is that part of the iron
on which the coils are wound. The yoke of a transformer, or
that part of the iron outside the coils, must have a total
cross—-sectional area at least ejqual to the area of the core.
A simple rectangular core has a uniform section, the coils
being wound on one side of the rectangle. In the more usual
arrangement of the T-U or E-I stampings, the core section is
twice the area of the yokes since there are two paths for the
magnetic flux from the ends of the core. Figures 1 and 2 show
the difference between the two types of cores.
The mathematical determination of the optimum area of
the core is extremely coplicated and the best average values
are given for outputs of 10 - 1000 volt-amperes in table 1.
7
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TITITIIIA
To continue the design of the practical example, where
an output of 130 volt-amperes is required, refer to Table 1
and choose the next largest output which is 150 volt-amperes.
The core section will therefore be 1.75 square inches of
Stalloy transformer steel.
When the area of the core has been found from Table 1,
the number of turns on the various windings is estimated from
Table 2.
To continue the example design, look down column 1 for a
core section of 1.75 square inches then across to column 2
where it is found that four turns per volt must be used. That
is to say, that for every volt across a winding on this partic-
ular transformer, there must be four turns. Take the primary
winding first, this is to be connected to a 240 volt main,
therefore the number of turns will be 4 x ”40 = 960.
When estimating the nunber of secondary turns an allowance
of five per cent extra turns is made to compensate for the drop
in volts due to the current in the windings. Where extreme
accuracy in the voltage output is required, the resistance of
the windings must be pre-determinecd and the number of turns
necessary to compensate for the drop in volts on load, or the
regulation as it is called, must be calculated. An easier and
more certain method is to adjust the number of secondary turns
until an alternating current volt meter gives the desired
reading when connected across the winding loaded at the normal
current.
Table 3 gives the wire sizes and their current carrying
capacity at 1500 amperes per square inch, which is a satisfac-
tory value for continues working.
June 1976 Q.R.M. Page 10
When the current shown in column 1 Table 3 does not
exactly correspond with the output current, the next highest
value is taken. Thus in the practical example, the 6 volt
10 ampere winding is wound with 13 S.W.CG. wire, The difference
being insufficient to warrant the larger gauge, The 100 volt
0.5 ampere winding is wound with 24 S.W.G. wire and the 70 volt
1 ampere winding with 21 S.W.G..
Before the gauge of wire for the primary or mains winding
can be settled, it is necessary to calculate the primary
current for full load. This is found by dividing the mains
voltage into the output volt-amperes.
In our example, the primary current is,
%%% = 0.54 ampere at 100% efficiency.
A transformer of this size would have an efficiency of
about 92 per cent, so that the primary current would be
0.54 x lgg = 0.59 amperes.
9z
It would be permissible to use 24 S.W.G. wire for this
current since the extra 0.02 ampere is to small to matter.
When the number of turns and the gauges of the wires to
be used have been found, the next step 1s to calculate the area
of the opening, or window, in the stampings which the winding
will occupy. For the transformer which is being considered as
an example, this is done as follows.
The primary winding has 960 turns of 24 S.W.G. wire.
From Table 3, it is seen that this gauge of wire winds 1775
turns per square inch. The area occupied by the primary is
Q
therefore 17%% = 0.54 square inch.
Similarly the 6 volt winding which would have 24 (6 x 4)
turns of- 13 S.W.G.
a3 3 3
has a winding area of 2
_24 _ 0.222 square inch.
108
The 100 volt winding will occupy ;Q%7§§é = 0.226 square inch,
and the 20 volt winding 222 = 0.0925 square inch.
2
The total winding area is now 0.54 + 0.222 + 0.226 -+ 0.0925
= 1,08 square inches.
It is now necessary to add about 20% allowance for the ins-
ulation between the layers, the space occupied by the bobbin and
insulation between windings. The area now becomes
1.08 x 1.2 = 1.3 square inches.
|
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June 1976 Q.R.M. Page 11
: _TABLE 1
Output Core Section Approx,
- (Volt-amperes) (Square inches) Stalloy Winding area
I 50 Hz (Square inches)
4 10 0.3 5/8
15 0.4 3/4
L] 20 0.5 7/8
25 0.6 7/8
< 50 1.0 1
75 1.25 11/4
100 1.5 1 3/8
0 125 1.95 1 172
150 155 1 5/8
175 2.0 1 3/4
- 200 2.0 17/8
250 25 2
300 2.5 2 1/4
350 3.0 2 3/8
£ 400 3.0 3
450 3.25 3 1/8
500 3.5 4
= 750 4.0 5
I 1000 4.5 5 3/4
L _TABLE 2
J Sectional Area
of Core Turns per Volt
(Square inches)
I 0.3 23.3
J 0.4 17.5
d 0.5 14.0
I 0.6 117
, 07 10.0
] 0.8 8.75
Ssg 0.9 7.8
l_ 1.0 7.0
: 1.25 5.6
- 1.5 4.65
l 1.75 4.0
| 2.0 3.5
4 2.25 3.1
I 2.5 2.8
2.75 2.5
| 3.0 2.33
2 3.25 2.16
l___ 3.5 2.0
3.75 1.86
- 4.0 1.75
I 4.5 1.55
June 1976 Q.R.M. Page 12
TABLE 3
Showing wire sizes and their current carrying capacity at
1500 amperes per square inch.
Current Wire Size Turns per
(Amperes) S.W.G., Square inch.
19.3 10 57
15.8 11 69
12.7 12 85
9.9 13 108
7.5 14 139
6.1 15 172
4.8 16 213
3.7 17 272
2.7 18 376
1.9 19 560
1.5 20 680
1.2 21 865
0.92 22 1,110
0.68 23 1,510
0.57 24 1,775
0.47 25 2,120
0.38 26 2,560
0.32 27 3,120
0.26 28 3,760
D.22 29 4,390
0.18 30 5,380
0.158 31 6,060
0.137 32 6,890
0.118 33 7,900
0.100 34 9,610
0.083 35 11,250
0.068 36 13,450
0.054 37 16,400
0.042 38 20,400
0.032 39 28, 250
0.027 40 32,450
WHEN USING A REPEATER ALWAYS LEAVE
A 3 SECOND PAUSE
FOR POSSIBLE PRIORITY TRAFFIC
OR OTHER USERS
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June 1976 Q.R.M. Page 13
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1) Use 4 ohm load for 6 to 12 volt supply and 8 ohm load for
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12 to 18 volt supply.
2) The printed circuit board is adequate heat sink for 2.5
watts to 25°C and 1.5 watts up to 70°C.
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3) The bypass capacitor from pin 1 to earth can be;
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0.047 manufacturers recomendation
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0.47 mcd for -18db @ 100Hz
4,7 mfd for -38db @ 100Hz
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for power supply ripple rejection (figures supplied by VK3AIW)
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