VK7RST 6 meter beacon Mt Nelson 1979
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VK7RST © METER BEACON.
CALL SIGN - VK 7 RST
OPERATING FREQUENCY - 52.370 + 800 HZ Upward Shift
POWER OUTPUT . Adjustable 10 - 25 watts
POWER SUPPLY - 240 volt step down to 12 v
regulated and limited to 4 AMPS continuous.
CRYSTAL FREQUENCY - 13092.50 x 4 multiplication stability
better than .0015%
KEYER - Diode Matrix clocked by free running oscillator
at 7 WPM every 30 seconds.
EXCITER HARMONIC CONTENT
(WITHOUT FILTER) - Second better than 45 db down
- Third better than 50 db down
ANTENNA FILTER PERFORMANCE
(SWEEP TEST) - 2 harmonic better than 60 db down
3 harmonic better than 90 db down
insertion loss .1 abal signal frequency.
ANTENNA - Crossed dipoles feed with 52 ohm. cable mounted
on 1% dia. G.S. pipe to be 12 ft. above roof level.
EQUIPMENT LOCATION - Plant Room, Level 5, R.M.C. Building,
Tasmanian College of Advanced Education,
1 Clinda Grove,
MT. NELSON.
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Mr. M.J, Hennessy,
Hon. Secretary,
The Wireless Institute of Australia,
P.0. Box 52,
SORELL 7172
Dear Sir,
[ refer to your letter of 10 December 1978 and agree to the
establishment of a beacon transmitter as you requested.
You are asked to obtain the approval of the P & T Radio
Regulatory and Licensing Branch and to make this written
approval available to the College before proceeding with
the work and to indicate that there is no interference
with the present transmission from the campus by the Hobart
FM radio facilities.
This approval is given also on the condition that the
antena will have a negligible visual effect.
Maintenance will be the responsibility of your Institute
together with all insurance costs. The location of the
equipment is to be decided after consultation with the
ive of the Hobart FM in an agreed position.
L.H. PEATRIE
CAMPUS MANAGER
14th May, 1979
MEMO TO: Hon. Secretary, Wireless Institute of Australia.
FROM: A. Ruthven, Convenor, Beacon Group.
SUBJECT: 6 Meter Beacon UK7RST.
Dear Sir,
I feel it is timely to report progress on the construction of this beacon.
The construction work load has fallen to two members of the group.
Both ill health, and a lack of spare time have delayed it&sc
completion.
Negotiations with the T.C.A.E. have domrlnded and ahey are agreeable to
providing a servicable site at no cost to the W.I.A.
I have discussed the location of both our antenna and equipment and
reached agreement with them. Power will be provided shortly.
The only outstanding concession to be mat is &o furnish a copy of the
licence approval to Mr. Peatrie.
The antenna has already been completed, tested and erected with coaxial cable
feed to the equipment location.
The equipment has been completed and is about to undergo "soak testing".
Private arrangements are being made with Departmental officers to assist
with the final check ant prior to commissioning.
Action required from Council is to proceed with the licence application
at your earliest convenience. If all goes well the beacon can be
commissidned when approval is given.
The information within the attached folders should be used to support the
application and can be retained by Council and P+T for your and their records.
73
A.Ruthven.
v T
M O AUSTRALIA
R A KERPTY LTD
PRELIMINARY
MOONRAKER AUTOMATIC TUNING ANTENNA SYSTEM -_FOR AMATU RADIO MOBILE
AND BASE STATION
The Moonraker automatic tuning antenna —|28
system comprises the whip (2.7metres) -
covering the operating frequency range
of 3 to 15 MHz and the antenna control
unit.
The system, using a logic controlled
1220
stepper motor to provide continuous
tuning over the frequency range of
the whip, has been designed for multi-
frequency land mobile and base station
applications.
Typical tuning time for one channel
frequency to another is less than
1 second maximum time from lowest to
highest frequency is 5 seconds.
On installation no further tuning
or technician programming is required
- the system being fully automatic.
The whips are centre loaded and are
constructed from anodised aluminium
1530
alloy tubing with a waterproof lower
section housing the control devices,
and a mid section spring knuckle
(optional) with fibreglass whip top
section. ‘CONTROL &
COAXIAL CABLE
The antenna control unit is the
interface between the whip antenna
and transceiver and contains the
sensor and controlling electronics.
As there are no external operator
controls, the unit can be installed BOmMmM DIA. ANTI - VIBRATION
in any convenient position within BLOCK SUPPLIED Ya"' wHIT
MOLNTING THREAD COMPLETE
the vehicle. The unit can be used WITH SFRING WASHER & NOT.
up to 20 metres from the antenna Power Consumption:
for base station installations.
100mA - static
Frequency Range: 2A - tuning (typical)
12V DC nominal
Any frequency between 3 and 15 MHz.
Input Impedance:
Channel Capacity:
50 ohms: VSWR 1.8:1
Continuously variable (typically 1.3:1)
Power Rating: Mounting:
120 watts PEP Anti-vibration mount %" Whitworth
stainless steel stud, 30mm long,
Weight: supplied with nut and washers.
EFach antenna 4.0 Kg
Control unit 0.7 Kg
Tasmania Technopark Dowsing Point 7010 Tasmania AUSTRALIA
Telephone: National 002 73 1533 Facsimile: National 002 73 1749
International +61 02 73 1533 International +61 02 73 1749
Q.R.M. , .
ng
theMR6Aon52.525
Putti . by Joe VK7ZGJ
Components required: 2 - 10 pF Disc ceramics
3 - 4,7 pF Disc. ceramics 1 - 12 pF Disc ceramic
1 - 33 pPF Disc ceramic 1 - 2.188500 Mhz Xtal, TX
1 - 10.905 Mhz Xtal, RX
Originally the MR6A used a high IF, around 12 Mhz. This
put the local oscillator frequency-on 65 Mhz giving you an
operating frequency of 77 Mhz. By leaving the oscillator on
the same frequency and setting the RF and Mixer stage to
52.525, only a very simple modification is required. This
entails placing a 4., 7 pF disc ceramic capacitor across Ll,
L2 and L3. Now switch the set on, place a 0 - 1 mA meter in
TJB receiver oscillator testpoint and tune the top slug of
TR2 for maximum, L6 for maximum and the bottom slug of TR2
for minimum. Because your 10.905 Mhz xtal is close to the
original xtal frequency, the stage should have oscillated
as soon as it was switched on and tuning should require no
more than one or two turns of any one slug to obtain the
correct reading.
ToaligntheRFstage. Tune the signal generator to 52.525
and QdJUoLfor centre zero on a meter 50 - 0 - 50 uA plugged
into DISC. jack TJrI'., Connect a 0-1 mA meter into thg52nd
limiter ]ack and peak Ll to L5 top and bottom slugsi reducing
your signal as you peak each slug so that the meter does not
erceed 200 uA, Repcat the alignment of all slugs, to ensure
accuracy of tuning adjustments.
After alignment a 1 microvolt signal input to the antenna
terminal should give not less than 250 uA in TJD.
All this takes acbout ten minutes if you have the correct
equipment.
The Transmitter.
Originally the transmitter used a 2 Mhz xtal and multiplied
36 times to 72 Mhz. Because we wish to maintain the original
frequency, we reduce the multiplication to 24 by making the
2nd tripler a doubler, and from this stage we have to lower
the frequency of the coils from 72 to 52 Mhz.
To do this place a 33 Pf capacitor in parallel with the
existing 33 pF capacitors of TR10. This reduces the frequency
from 36 to 26 Mhz. Next place a 10 pF capacitor across L9 and
L1l and a 12pF capacitor from pin 6 to pin 8 of V21 (QQEO 3/12).
Transmitter Alignment.
1) Disconnect screen resistor at pin 7 of V21
2) Plug a 0-1 mA meter into jack TJ6 (1lst tripler grid)
.. press PTT and tune top and bottom slugs of TR8 for maximum.
3) 0-1 mA meter in TJ4 (2nd tripler) tune top ard bottom
slugs of TR9 for maximum.
4) With 0-10 m2 meter in TJJ (2nd doubler) tune TR10 for Max.
5) With 0-10 mA meter in TJK (PA grid) tune L9 and L1l for max.
6) Re-connect screen resitor and connect wattmeter to aerial
connector.
7) Tune the PA anode capacitor C96 for maximum power out, then
re-adjust L9 and L1l for maximum drive in (PA grid)
8) Gradually couple L1l4 aerial coupling link into L13 PA coil
keeping C96 tuned to resonance untill a power output of
10 watts is indicated with a PA anode current of 75 mA or
less.
Q.R.M | i
Typical meter readings.
1st tripler, -5 to -8 2nd doubler, 1 to 1.4
2nd tripler, .8 to 1.2 Drive 2 to 4 mA
Adjust diviation and frequency with the appropriate equipment.
You are now ready to work a lot of DX mobile on 52.525 this
summer.
Next month I will produce an AC power supply circuit, suggested
modifications and things to check to ensure years of trouble
free operation. :
Total time for the above modifications is around 30 minutes.
0000000000000000000000000
PUTTING THE AWA MRT25A ON SIX METRES -52.525
by JOE VK7JG.
These raodios are available from the H.E.C. for around $15.00,
With about one hour's work you can get them going on six metres.
If you are not familior with the set, you will need o handbook, or
bring it to me for clignment. The recceiver will gc «z soon as you
modify it. However, the traonsmitter is a little off tune and you
will require a test meter to tune it correctly. The receiver
oscillator remains unchanged, i.e. mix on the high side. If pos<ible,
check the radio before modifying it as a lot of them are U/S. Fit
an additional 18pF copacitor across C2, C8, Cl11, C16, C18. Increase
coupling capacitors C10 and C17 to 3.3pF. Replace the R.F.head and
the radio should work.
The traonsmitter tokes a little longer but is just as simple.
(
f X'l’dl - fe
24
_52.525
= T 2.]8854 spec 063.
f
Receive xtal = -2—5—1941 = 31.6125 spec D66.
Fit a 220 pF capacitor ccross C6, C21, C22.
Fit o 33 pF capacitor across C13. Fit 100 pF across C26.
22pF across 12BY7 grid coil.
10pF across " plate coil.
18pF across 12AQ5 plate and grid coils.
10pF across 6883B grid coil.
Rewind plate coil to 10 turns.
Align radio as per handbook. The receiver should receive *5 V¥
for 20dB quieting.
The transmitter power is 20 watts at 13 volts for 150mA
plate current. Adjust deviation to +5 KHz.
~ If you have any problems call me on air, U.H.F. repeater or R.8.
( Phone 003.272256.
'- -
BRANCH MEETINGS IN TASMANIA.
' 1. The Southern Branch meets on the first Wednesday in
the month
in ;he State Emergency Services building, Melville Street, Hobart
at p.m.
’
2. The Northwestern Branch meets on the 2nd. Tuesday of the
month (except January) at the Penguin High School. The Executive
meets on the Tuesday prior to this.
X 3. The Northern Branch meets on the 2nd., Friday of the month
(except January) at Kingsmecdows High School, Launceston.
A QEMOTE AN(ENNA Q..w\-rcH ~—
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