QRM
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il 1R R
Bulletin 1ssued by the Northern P.O. Box 1010
Branches of the Wireless Institute Launceston
of Australia, Tasmanian Division Tas. 7250
March 1977
Vol.6 No.11
Reagistered at GPO Hobart
~for transmissior by post
"as a periodical. Category B.
MEETINGS
March 8th North West Branch, Lakins Hall, Ulverstone. 8 p.m.
March 1llth Northern Branch, S.E.S. rooms, Charles St. 8 p.m.
A.0.C.P. CLASSES
Kings Meadows High School, Block B, room 35
March l4th Electrical Laws and Circuits
Mar~h 21lst ot ! " !
March 28th ! ! ! !
April 4th Vacuum tube Principles
_CONTESTS
March 5/6 ARRL DX Phone contest
March 5/6 YL - OM CW contest
March 19/20 ARRL DX CW contest
March 12/13 Commonwealth contest 1977
March 26/27 CQ WW WPX SSB Contest
March 26/28 BARTG Spring RTTY contest
April 12/13 DX YL to W/VE YL CW Contest
MARCH 18 Deadline for the April issue of Q R M
Page 2 QR M March 1977
ANNUAL REPORT : 1976 1977
Meetings this past year have improved from last year.
with an average of 34 members in attendance. Lectures also
have been varied, with possibly the best being by Professor
R.H. Thorpe, Chairman of the Australian Consumers Council,
as well as two auctions this year and the usual equipment
display by members. We saw seven associate members join the
Branch this year, with at least three of these members becoming
"A" Grade. as well as two limited licensees throwing away
that "Z". Congratulations to you all.
The equipment store this year has had a very succesful
turnover, mainly due to the efforts of people like Daniel
Apted. Graeme Reardon and others, and of course to you the
members who supported it. However, it must be discouraging
to those people running the store to find members buying
interstate merely to save a few cents. Remember, the larger
our purchases, the better deal we will be able to obtain for
you. Again, thanks to all concerned.
On the social scene, functions were well supported by
members, with the two main functions being, the progressive
dinner in September and the Divisional Hamfest in November.
For the progressive dinner, my thanks go to those people who
made their homes available for this function. As far as the
Hamfest is concerned, this year was the best yet. To all those
who had anything to do with the organising, again, many thanks
on a fine effort, from the membership.
Repeater VK7RAA has done a mighty job again this year,
with, if my memory serves me correctly, only one major
breakdown. The repeater is still the prime channel of communi-
cation in the Branch, and I would like to take this opportunity
to thank all those people who have helped to keep this device
on the air.
The Branch has done its fair share toward the presentation
of the Sunday morning Divisional broadcast, and it is pleasing
to see some new stations on the roster list, especially for the
80 metre re-broadcast. We also saw a 27.125 MHz re-broadcast
started in this Branch this year.
On the educational side of things, the Y.R.C.S. and
A.0.C.P. classes have, I think, adequately filled a need, and
again, my thanks to those people who have contributed to these
activities.
"0 R M " has continued to be the voice of the Branch, with
the standard being at its usual high level. John van Staveren
VK7JV, has diligently applied himself to the job of Editor, even
though he could have done with more support from the members
as far as articles were concerned. Thanks again John.
A 6 metre beacon was established in the Branch, mainly
due to the efforts of Joe Gelston VK7JG. This beacon, together
with the more active VHF operators, is doing its bit in keeping
the Northern Branch in touch with other VHF operators interstate.
As last year, regular meetings have been held throughout
the year by the executive members, and I would like to thank
them all at this stage, for their support and enthusiasm
throughout the year. Finally, I would like to conclude this
report by thanking you all for supporting the Branch
cont. page
March 1977 QR M Page 3
Northern Branch Notes by Graeme VK7ZGG.
The Northern Branch meeting was held on the llth February
at the S.E.S. rooms in Charles St. The attendance was about 30
with visitors Dale Barnes from Hobart and VK7ZFR Junior.
The meeting was told that the AGM of the Division is now
to be held at the Down Towner and it is hoped that as many
members as possible will attend.
Joe reported that there is still a supply problem in the
equlipment store with some equipment and components on back
order for several months and one supplier requiring an order
for $100 before supply can be effected.
General business discussed included the National Field
Day. the A.0.C.P. examinations and the A.0.C.P. classes which
will commence this year with an introductory lecture on Monday
28th February. Classes will begin on Monday l14th March.
We were pleased to pass two applications for membership
and welcomed Alan McKercher and Edward Ratcliffe as associate
members.
The submission to the Minister on CB in Australia was
discussed at length and members were asked to give their ideas
to Reg VK7KK for inclusion in our submission.
A lively discussion was held on last months Editorial
in QRM with members giving their views (rather forcefully at
times). The meeting closed at 2150 hrs and much further
discussion was held over supper following a rather fast run
to the "milk factory'" and back by Malcolm VK7ZMM - he apparently
doesn't take milk with his drinks.
Incidently the treasurers report this month showed a very
healthy bank balance of $1628 with .xmas sales down to $299.51.
Well hope to see you all at the next meeting which is
the AGM for the Northern Branch and you «~ill all no doubt, be
raring to take a place on the executive and do your bit towards
the running of the Branch.
Thats all for this month
73 Greame VK7ZGG
ANNUAL REPORT 1976 / 1977. cont. from page 2
and the W.I.A. by taking part in activities held throughout
the year, which has made the Branch what it is today. But at
the same time, be prepared to pitch in and help whenever there
1s @ need and not just sit back and watch others do the work.
73 Brian Yeoman
Branch President. 11/1/77
Page 4 QR M March 1977
Notes from the North West Branch by Max VK7MX.
We are sorry to report that our QRM correspondent
Lindsay Johnson has been indisposed for some weeks but is
recovering slowly.
Our February meseting was well attended,with 17 licensees,
9 associates and visitors present. The usual business was
transacted. We were sorry to receive Winston's (VK7EM) resig-
nation from the beacon and repeater committee due to pressure
of work. Thanks Winston for your valuable assistance in the
past. Tony VK7AX offered to help until the annual meeting next
month.
We were fortunate to have Reg VK7KK present and he was
prevailed upon to address the meeting concerning council
matters. Members were very interested and Reg answered some
relevant questions.
It was reported that the organisation handling the Port
Sorell Field day have matters in hand.
It was unfortunate that our speaker from the Rural Fires
Board was unable to be with us due to the bush fire situation.
However in place of this, Graham VK7ZAQ, Ivan VK7ZA0 and Adrian
VK7ZAT gave a demonstration of the making of circuit boards by
the photo etching process. The meeting was very impressed by
the technique which resulted in a very professional job.
During the field day contest several members took to
the field. VK7ZAQ, VK7ZA0 and VK7ZAT together with several
assistants operated from the Walls of Jerusalem in the Western
Tiers. VK7ZKC and VK7ZBL were heard from Table Cape. Some
base stations were heard co-operating.
During the month we have enjoyed several good openings
on 2 metres and to a lesser extent on 6 metres. Not only have
repeaters been worked but numerous contacts to VK3 have been
made on simplex channels.
We have had several visitors through the area including
VK6XY Aubrey, VK3YRS Ian and VK3BLD Bob. They received the
usual N.W. Branch welcome on 2 metres.
After an unfortunate blow up to the powerline to our
instalation at Loonah, repairs have been made and both the
2 metre and 432 MHz beacons are now operating from this area.
That is about all for this month.
73 Max VK7MX
Everybody is leaving us.
Byron VK7BD has left the North and is now residing
in Hobart. Byron tells me that he may be there for up to
three years, he has been given the opportunity to further
his qualifications and career in Telecom.
Mark VK7ZMC has left Tasmania for Canberra to attend the
University there, good luck Mark and don't forget to come and
visit from time to time. )
March 1977 QR M Page 5
DX notes by Col VK7LZ.
To the ardent DX'er the best DX is of course a new
~ountry, so the best DX of the month would vary considerably
from amateur to amateur. however the best stations heard
during the month 1in my opinion would, irrespective of mode,
include the following:
1.8 MHz N6DX, K6SE, W7RM, JA30ONB, JATCEO.
3.5 MHz ZL4LR/A Campbell Isl, XE2AAU, VE1ZZ,
7 _MHz ZK2AT, GI3IVJ, GM6RV, SP2JKD,
14 MHz 6W2UQ, 6W8DY, OY3H, OH@gNJ, JT1KAA, 6Y5MR, VE2SN/SU
UOSOBW, FM7WE, 3Z2A, WB6EWH/VQO.
Of the above the best two would undoubtably be &6W2UQ
and 3Z22A, the latter who gave his QTH as Tristan da Cunha must
as yet be treated as '"very doubtful", although my beam heading
was West of South , the prefix is that of Poland. however in
DX the best maxim is, "work'em first, worry later) 6W2UQ is a
good bet, he has worked several VK7's and has promised to send
all cards air mail, Zane likes to rag-chew, our QSO lasted 30
minutes. Whilst talking DX metion must be made of the six
Launceston amateurs who banded together to work portable in
the John Moyle Field Day, they were VK7's BC, DK, JV, Lz, TB
and ZDA., although VK portable stations were first choice, DX
was worked on all bands from 144 MHz to 3.5 MHz, yes interstate
VK's are DX on 144 and 52 MHz, over 20 countries were worked
and everyone thoroughly enjoyed the experience. Ed VK7HE was
also operating portable but no info is available on Ed's
exploits.
As most of my limited listening time was confined to
the lower frequency bands no specific call signs can be
listed for 21 and 28 MHz, I understand that both these bands
had some very interesting periods and would be well worth
watching, Bill VK7AK has spent some time on 28 MHz and has
worked several W's including one only using 5 Watts SSB.
It has been reported that VK9ZM Willes Isl. is operating on
28.560 MHz this could well be a new country on 10 metres for
a lot of people.
Space will not permit the full list of stations heard
quoting times and frequencies, however in very limited time
I listed 75 countries so there must still be interesting DX
for everyone in spite of the low sun spot activity, if more
info was available, particularly from the other States it
would be extremely helpful for everyone, unfortunately A.R.
has not been able to compile a DX page for some time which
must be missed by many DX'ers throughout Australia.
QSL information.
HK@CLS via WAQGCLN, S79FC via ON4CH, ZK2AT via K3RLY
9D5A via WAGAHF, WB6EWH/VQ9 via WA4FVT
6W2UQ, C/o U.S. Consulate, Dakar Senegal.
S8AAA (Garth) C/o P.O. Umtata.
TJ20J, Box 39 Port Lame, Cameroun
73 GD DX Col VK7LZ
Page 6 QR M March 1977
VHF notes by Kevin VK7ZAH.
Having being away from my home QTH for the majority of
the month, these notes are compiled from information supplied
by various sources.
The most noteworthy achievement has been the establish-
ment of a new 1296 MHz distance record, VK5 to VK6. This is
a very fine effort and I would think it will be a long time
before this record 1s bettered.
The 6 metre band still opens and stations can be worked
1f one listens at the right time on 52.050 or 52.525 MHz.
Joe VK7JG informs me he worked stations on 6 metres on 3lst
January and 18th February. A good opening occurred on the
12th February to VK5,2,4 signals were very strong with the
band remaining open for about 4 hours. It seems that VK7ZMM
was the only Northern station active at the time. Daniel
VK7ZDA reports that he worked a number of stations on the 13th
of February while operating portable in the National Field Day
from the Asbestos ranges.
I believe the 2 metre band has been in fine shape with
openings nearly every day. Whilst at Stanley I was able to
hear repeaters 2,3.4.6,7.8 from VK3. Joe VK7JG and Peter VK7PD
appear to be the most active stations in Launceston at the
moment. On the 1llth, 12th and 13th of February the 2 metre
band was open, the latter 2 days being the National Field Day,
there were a large number of VK3 stations out portable for the
Field Day and most achieved a high score.
The VK7, 2 metre beacon has been relocated at Loonah
(N.W. repeater site) but at present is using one of the
repeater aerials, vertically polarised. Even so the signal
radiated is much stronger in Launceston than from the previous
site. I would think that the beacon should now be heard in
VK3 when the band is open.
The only information regarding the 432 MHz band is that
the beacon at Loonah is once again operating.
That is all the news I could dig up for this edition.
73 Kevin VK7ZAH
FOR SALE.
Barlow Wadley XCR-30 receiver complete with power
supply. in very good condition $200.00
Ray Kilby 19 Greenway Avn. phone 441849
EQUIPMENT STORE
As Joe Gelston VK7JG is away for 3 weeks on annual leave
the equipment store is now at the QTH of Mike Wilson VK7ZWW,
11 Georgetown Rd. Phone 263588, Mike asks that you make
your visits to the store before Sp.m.
March 1977 OR M Page 7
The Editor QORM
Dear OM
Your readers may be interested in my ATV contacts
with VK3 stations on the 27th January 1977.
From 1900 hours T.S.T. until midnight on that day,
tropospheric conditions allowed very fine T.V. pictures to be
exchanged between my station and VK3's AKC, BFG, ZVJ, 2ZU and
ATY. Among the highlights of the evening were -
Ron VK3AKC showed me views around his shack and outside, his
E.M.E. dish antenna.
Peter VK3BFG, after showing me his equipment played a video
tape recording of views around his QTH including a good close
up of his 48 element phased array antenna.
After looking at several test cards from Bob VK3ZU, he surprised
me by saying that he was only running 600 miliwatts to a small
vagl antenna. Most of the other stations were running 90-100 Watt
Both Peter and Kevin VK3ZVJ made video recordings of my signals,
test cards and various captions of scenic views etc. and sunset
views around Penguin, some were retransmitted to me later in
the evening at very good strength and quality.
Signals peaked around 23.30 when 'crystal clear" pictures were
received from Ian VK3ATY who displayed his equipment, cameras
etc.
73 Winston VK7EM
extracts of a letter to A.R. from Ed Hewens VK7HE.
Dear sir
With respect to editotials and letters on CB.
My opinion is that we as amateurs must get together by
expressing our views to the W.I.A. who can then correlate them
for and against and approach the responsible authority with a
proposal agreed to by the majority of members.
I feel that the multi-nationals can afford to lobby for
CB more effectively than the W.I.A. against. I therefore
suggest we look at :-
A) Offer the 11 metre band in exchange for more space on
80 or 40. i.e. 3.7 increased to 4 MHz.
B) Propose a VHF or UHF area for CB with pros. and cons.
C) If "B" is proposed, get geared up to put a converter from
11 metres to the VHF or UHF frequency on the market.
D) Names, addresses of known illegal users of the 11 metre
band be supplied to the proper authorities for prosecution.
H.E. Hewens VK7HE
Page 8 OR M March 1977
to the Editor QORM
Dear Sir
The Editorial in the February issue of QORM
appears to be an abuse of editorial privilege, since it
presents a highly personal viewpoint in the guise of a
summary of general opinion. If such statements had appeared
in another part of the magazine they would still be debatable,
put the bias would be kept in perspective.
Perhaps as a result of the writers distrust of school
teachers, the letter lacks form and style (unless a sustained
note of peevish hysteria could be said to contribute either).
However there is really no excuse for the confusion
between simple singular and plural. Instead of '"some of these
people are scoutleaders and schoolteachers...." why not "I have
in mind a particular scoutleader and a schoolteacher"? The
implication regarding lawbreaking would remain unjustified, but
the focus would be more clearly on the exact recipient of the
editors displeasure and several other scoutleaders and school-
teachers would escape the general splash of vitriol.
If the object of the editorial was to set up a reaction,
why was the writer not present at the subsequent meeting of the
W.I.A., did he fear that someone that he slyly maligned would
be there to defend himself, did he lack the courage to confront
him ? Surely the members of the W.I.A. are entitled to a
discussion of facts. not a series of unsubstantiated hints.
yours faithfully
Collis T.
The Editor. QRM
Dear Sir
You are to be congratulated on the strength and
honesty of the editorial printed in the February issue of ORM
an article which I am sure has the wholehearted approval of
the majority of members in this State at least.
I have operated radio stations since 1955 in most areas
of the world and am fully aware of the need for regulations and
the rule of law.
Each year we elect certain members to positions of
authority within the Institute, to look after the interests
of the membership in general, last year we appear to have made
some wrong decisions for we have suggestions from office
bearers such as giving up the 11 metre band for a few more KHz
on 80 metres, or just giving up this band.
However election time is approaching and we should all
think very carefully before we vote in these elections.
An article by the federal president published in the
November 1976 edition of A.R. refers to the very definite
policies held by the Wireless Institute with regard to intruders
into amateur bands. It would be resonable to expect some news
of these policies being implemented in this State, or is this
hush hush. ‘
C.F. Beech VK7BC
March 1977 QR M Page 9
The Editor,QRM
Dear Sir,
I was extremely pleased to see VK7JV's editorial
on CB in the February ORM. At last somebody has had the
1ntestinal fortitude to put something in print.
This CB thing has been caused by many factors, the prime
one being the large hobby-ist stores who stand to make a
fortune. Secondly the loophole in the law that makes it legal
to sell this equipment. (You have to be 18 years or older to
buy cigarettes or see a skin flick but anybody with the money
can buy a transceiver.) The third one is the lack of action
by the W.I.A. and its members. This ugly problem has been
growing for years now.
The Institute members should have been shouting loud and
long its protest about inaction regarding the growing of pirates
on the bands. This problem is not limited to 27 MHz. I think
you have all heard the VK3 repeater when our friendly '"Fowl" and
his mate the '"Whistler" are at work. It is not the job of the
amateurs to track these problem causes. Imagine how long our
above friends would last if they did their thing on the police
frequency. This type of piracy should not be tolerated.
For these reasons I urge all amateurs to do what I have
done and that is, voice your complaints of inaction to your
local government members.
As for the idea of handing over part of an amateur band,
I think no reason is good enough to justify this.
As you can gather I am not in favour of 27 MHz band for
this and support John's idea about VHF/UHF and FM,
Regarding those people with a genuine need for this
style of communication the extra cost of VHF equipment would
not really worry them. It is only a lapse in the strict PMG
regulations they really seek. (See story on Wheat Harveting
E.A. Feb. '77)
On this issue we, as well as the PMG and the government,
have got ourselves 1n a real mess. Tuning up on these fellows
while they try to operate may help your feelings a bit but it
only creates trouble and ill feeling. Attack the problem the
way we should have done years ago, give your local member no
rest on the matter. Let him know there are a lot of angry
amateurs in the area.
G.E. Rand VK72AQ
It appears that the editorial published in last month ORM
inadvertently referred to certain persons who might have felt
offended by it. No offence was intended and to those who
believe they may have been offended, we offer our apologies.
We consider this subject closed for the time being and no
further correspondence will be entered into at this stage.
Page 10 QR M March 1977
HINTS AND KINKS.
Circuit Board Jig
Wanting to cut circuit board, I had trouble getting
good cuts, using my jig saw, without scratching the circuit
board. So I made up the unit shown using scrap timber. The
unit I use is about 15" long and 11" wide.
The circuit board size is marked and placed under the ply
flaps with the marked line showing in the gap. By applying
slight pressure whilst cutting the circuit board is held in
place by the flaps and doesn't mark the board. Very fine
strips are easily cut this way.
2!
Material; 2 pieces 2 x 1 about 15" long held apart by a 1"
wide piece of ply at both ends and along the
bottom. These 2 x 1 are nailed together through
the ply to form the %" gap along the top.
2 pieces 5" wide %" ply about 14" long are nailed
to the 2 x 1 one each side of the %" gap.
2 pieces of %" ply about 3" or $" wide and 11"
long are nailed with a few brads to the %" ply
at one end only, making flaps.
73 VKTHE
WANTED WNANTED WANTED WANTED
If you have any old electronic magazines, publications,
books or schematics that are no longer required DON'T
throw them away, please call me I'll gladly pick them up.
Ed Hewens VK7HE, 43 Faulkner Rd. Ravenswood. Phone 391863
Wanted to buy a small FM 2 metre transceiver IC22 or similar
details and price to Ray Kilby VK7RK, 19 Greenway Avn.
Phone 441849
March 1977 QR M Page 11
Another Way to Void Warranty on an "ICOM".
Fit a Priority Channel, by Adrian VK7ZAT.
This is a single channel, easily selected by a button,
no matter what position the main channel switch is in. It
requires few alterations and can easily be removed when the
unit is sold.
It consists of an electronic switch (and indicator),
driving 2 reed relays to select the priority channel and
disable the channel switch.
The circuit is simple, consisting of a bistable multi-
vibrator to convert the momentary on - push button into an
on-off switch for the reed relays.
The channel switch commons are wired through reed
relays to change them over to a seperate crystal holder and
trimmer (use the spare socket and trimmer in set).
Rl %
O
QI»+ @2 DBclog +n2V
] NPN PowéR THANS 1570R
STRING RETURN
i = s1 I
Tx XTAL Rx x7AL
7o Cannm on 7o Comnor om
A:
c/lnm.:L S TeH L'mvmfl. SUiTes
(yettow) (wairéd
FRom Tx Lommen FRom RX Combgory
SWITCH
SWiTe H
*Special Parts:
The two 0.1 capacitors (Cl + C2) must be polyester or
polycarbonate types.
R1 - The value will depend on the current drawn by the unit,
this is mainly determined by the coils used for the
reed relays.
Page 12 QR M March 1977
L1 + L2 - Reed relays come with a matching coil but this was
found to be too large physically so the hirizontal oscillator
coils out of a "Philips" black and white T.V. were used.
These ? used in series were smaller and used less current than
the original coils. R1 was chosen to give minimum current drain
which still reliably tripped and held the reeds (remember
voltages between 10 - 15V are encountered in a car).
Current consumption of the test unit, reeds off i.e.
wired for priority channel, 8 mA, reeds on 18 mA, with the
original coils this was 40 mA.
S1, was the unused call selector switch on the ICOM
or any spring return switch.
The indicator assembly used was to turn a light on
when the priority channel was selected. The TX indicator
light was rewired to do this job. The LED in the microphone
and the meter being used for R.F. output indication.
WARNING. If TX light is removed and an LED is fitted across
the PTT line a 100 Ohm resistor must also be fitted across the
PTT line to earth or the transmitter will lock on.
This method of indication was found more satisfactory
than turning off the light behind the channel indicator,
however either could be used i.e. sense off Q1 collector to
turn off light.
The unit was constructed on vero board and fitted
snugly behind the channel selector switch, flush to the top
panel. The power supply must come from the 12V input rail
and not one of the other rails which are switched between
receive and transmit.
The trimmers used were robbed from an unused channel
but as there are 4 extra crystal holders fitted and not
wired to the switch, the purchase of two trimmers would
mean 22 switched channels plus priority channel still
usable.
Any queries or further information on this project
can be obtained by contacting me at the address shown in
the callbook. Adrian VK7ZAT
FOR THE NIGHT OWL.
To stop loosing the microphone while mobile at night
fit an LED in the microphone. A small hole drilled under
the name plate will accomodate an LED held in place with
a small dab of glue.
The B+ is taken through a 1K resistor from PTT line
and earth. It also acts as a TX on indicator, the LED goes
off when the TX is on.
Adrian VK7ZAT
MODERN SOLID STATE CONVERTERS
VHF Modern solid-state, high performance converters
for 28/52/144 MHz bands. Featured in Feb
GONVERTER ninies
28 MHz/ETI707B......
52 MHz/ETI707B . ..............
. $11
..... $11
K'Ts 144 MHz/ETI707A ... .. ... ......
. $14
These converter kits are simple, easy to construct and align.
® 28/52 MHz (ET! 707B)
Th's 1s a tried and proven design and was featured in the January
issue of ELECTRONICS TODAY INTERNATIONAL. Noise figure
>n 10 m cr 6 m is a little meaningless but this converter produces a
noise figure of around 2 dB. Gain is 20 dB or greater, bandwidth is 3
M2 on 6m, 2 MKz on 10m, spurious responses — 50 dB or better.
Choice nf IF frequencies to suit yourself. Please specify 28 MHz or
52 MH.: operation. Crystal not supp!aed Fibreglass p.c. board. Value
at $11 or just the p.c. board
.. . $3.10
® 144 MH2z (ETI 707A)
Naturany another simple converter. An original 6 UP design, this was
also featured in the January 1976 issue of ELECTRONICS TODAY
INTERNATIONAL. This converter was designed for low noise (3
dB or better) and low crossmod. performance. Gain is adjustable,
with a maximum of about 20 dB. Bandwidth is also adjustable
between about 0.5 MHz and more than 1 MHz. Spurious responses
are down S50 dB or better. Choice of IF frequencies to suit yourself.
No neutralization. Crystal not supplied. Fibreglass p.c. board. What
more could you want for... $14 or p.c. board only ... $3.50
o= 0 432 MKz (6UP-004)
The famous design by VK5QZ — now a standard of sorts! Improved
p.c. board. This is probably the simplest way to begin on the UHF
bands. A simple and straightforward design that produces good
performance . .. noise fiqure approx. 4 dB, JFET front end, gain of
10-15 dB, |F of 28 MHz or 52 MHz although some constructors
have used 146 MHz successfully for FM net operation. Bandwidth
approx. 4 MHz. Fibreglass p.c. board. Crystal not supplied.
Complete with straightforward instructions. Head for the frontiers
for ..$14 or p.c. board oniy ... $3.35
=k ¢ MARKER (6UP-006)
This provides harmonics to 1296 MHz from a 1 MHz crystal or to
432 MHz from a 100 kHz crystal. Can accept crystais to 15 MHaz. T
Uses 5 transistors. Crystal not supplied. Find the band edge "
for . $7 or p.c. board only , .. $2.55
PACK & POST on kits is 60c per kit. T
CIRCUIT
send s.a.e. for details on coil components,toroids,baluns & other
kits and components
THE WHAT, WHEREWHOHASSLES & HOW MUCH BOOK
(OTHERWISE KNOWN AS “THE AMATEUR'S PINK PAGES™)
A COMPREHENSIVE COMPENDIUM OF COMPANIES AND COLLEAGUES THAT
COLLECT CURRENCY FOR COMPONENTS; SELL SOCKETS AND SWITCHES |
OR SUCHLIKE FOR CENTS; ARRANGE ARCLIGHTS OR AARDVARKS FOR a paitry
ARDENT AMATEURS; FLOG FT200s AND 4X1000S.....0veeveorcnscnns $2 50 ’
in fact, if you have ever wondered where to get something, .
or perhaps where else, then this book is for you. It does +40c Post
not cater only for those who build lots of gear - even if you
only read about amateur radio, you need this book. It also
tells you where to get the things you 1ike to read!
AMATEUR COMMUNICATIONS
ADVANCEMENTS
P.0. BOX 57, ROZELLE 2039
J&
T GUNN PTY. LTD.
50 BRISBANE ST. LAUNCESTON
Telephone 222 51
DOMESTIC & BUILDERS HARDWARE
MARINE & PLUMBING SUPPLIES
PAINT & TOOLS
SEDDON PRESS
35a GRANVILLE ST. LAUNCESTON 7250
Telephone 31 61 91
FOR ALL YOUR PRINTING
BUSINESS AND PERSONAL
QSL CARDS
MORWIND
g
ELECTRICAL ENGINEERS
SPECIALISING IN MOTOR REWINDING AND ASSOCIATED WORK
27 SUNCREST PLACE, RAVENSWOOD
TELEPHONE 391515
Athol Lawes Electrics
135 HOBART ROAD, KINGS MEADOWS, PHONE 444710
FOR ALL ELECTRICAL APPLIANCES, SPECIALISTS IN,
HI-FI SOUND SYSTEMS
CAR RADIO AND STEREO
SEE US FOR A BETTER DEAL, WE SERVICE ALL WE SELL.