PW 1982 08.pdf

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t
.
For every one you send for processing
by the Practical Wireless'Colour
Print Service.
Fast, efficient, high quality film
processing
is now as close to you as
your
nearest post
box. Hundreds of
thousands of magazine readers ate
delighted with this reliable Colour
Print
Film Service- and the replace-
ment film that comes free every time
they
use
it!
So
why don't you give it a
try?
Here's what you do. Send any
make of colour print film
inside
the
envelope enclosed in this issue. Or
fill in the coupon below and send it
with your colour film in a
'
strqng
envelope to:
Practical WIreless Colour Print
Service,
FREEPOST,
READING
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SEND NO MONEY
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reliability of the
'
service and the
q,uality of oor prints, (each one is
date stamped with the month and
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pay until you have
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them!
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You will be amazed at- the
beautiful
..colours
and hi-definition
sheen finish of the prints we
In the event of any query. please write to
:
Customer Re lations Dept
..
Colour Print Express
.
Lld"
p
.a.
Box IBO. READING RGI 3PF or
phone Reading (0734) 597332.
supply
...
with elegant rounded
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maximum picture area. And now
with the
new
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get
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more picture area than the
standard enprints at no extra cost.
UNBEATABLE VALUE
The new Giant Superprints cost
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charge of
£1.10
is
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developing, postage and packing.
That's all you pay and, when we
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,
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The offer is limited to the U.K.
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and
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.
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MORE BENEFITS
TO YOU
You benefit in tWo additional
ways. Firstly, you enjoy a personal
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each individual order. And secondly,
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c.1.
Ojj'e r
ex c.
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&
Sub'miniaturejilm. Ro llfi/m 20p
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eNS
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haD
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Prices correct at time of going
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From
:
Prac tical Wire
less
Co
lo
ur Print Se rvice. FREEPOST.
RE
A
DING RG! !BR
.
Please print my film Supe rprint/ Sta nda rd
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te
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h is no t required).
Mr/ Ms'_
_ _ _ _ _ _ _ _ _ _ _ _ _ _ __
A
ddrcss _ _ _ _ _ _ _ _ _ _ _ _ _ _ __
Poslcode
AUGUST 1982
VOL. 58
NO.8
ISSUE 905
.e.te.t.
19
Are the Voltages Correct7-3
Roger Lancaster
Frequency Synthesiser
Mirko Voznjak YU1AD
Studying for the RAE
Arthur Harada G41NX
A 28M Hz Pre-amplifier
Jeff Harris G3L WM
28M Hz-The Low-power DX Band
D.
O.
White G3ZPA
28M Hz Operating
Jeff Harris G3L WM
CB Rig Check
Cybernet 1000/3000
PW "Morse Show"-2
Steve Damon GBPYP
If You Can't Beat Them ...
Shelagh Ibbs G6HJT
From Spark to Space
RonHam
Air Test
Mutek SLNA 144s pre-amplifier
Sabtronics 2037 A d.m.m. kit
OUR SPECIAL OFFER THIS MONTH
Master Check Probe
(see page 54)
87
60
21
46
Advert Index
Air Test
Benny
CB Rig Check
Comment
Mods
News
Next Month
22
28
34
36
38
46
49
55
56
60
17
32
41
43
62
43
48
18
17
59
33
On the Air
Out of Thin Air
Production Lines
PWRUIS
Services
Swap Spot
Uncle Ed
\
~
Repeeted from
July 1982.
Prectical Wireless
TRIO
CB
ie
a
mobile
short-ramle
telephone
svatem.
You require a
licence
to
U8e
It, £10
p
.•.
from
Poet
Offices.
Thi
s
month's CB
Rig
Check
cove
rs
three mobil
e
transceivers,
·two
of which are
ve
ry
simi
lar
to each
other
and
obviously
come from the same factory
.
Th
e
third
rig
is
o
ne
of
the first
from
a recognised amateur source in the
UK.
All three rigs gave clean
r.f.
outputs
within
the
limitations
of the measuring equipment used
,
as the re
specti ve
spec-
trum
analyser pictures show.
However,
in terms of power
output the
Lowe TX
-40 was
giving out
almost
7W of r.t.
power into SOn-some 175 per
cent
over the legal limit.
atthough we were
assured
that the rig had passed the rele-
vant checks and was below
the
legal 4W when measured.
With
the
attenuator
in
it
produced twice the lega l limit
I
The
other
two
rigs, a Uniace
100
and
a Rea
li
stic
TRC
-
2001, both gave 4
·8W
at 13V d
.c.
supp
ly level.
Obviously,
the manufacturers hope the test house
supp
ly
wi
ll
be lower.
The
Rea listic
and Uniden rigs are good
examples
of
'badge
engineering'
.
Apart from the front
panels
and
some
very
minor
di
fferences
in p.c.b.
layout.
they
are
the
same
rig-even the serial numbers show remarkable
similarit
ie
s.
Both
are made in Hong Kong
and
are good
examples of
that
area's
radio production. Over the test period they performed
capably and
both proved
easy
to handle. The Lowe model
was also
we
ll
made
and was a creditab
le
performer. It is un-
fortunate that
it
was
way
over the top
on
output power.
Receiver
sensitivity
of the
Lowe
was much better th
an
the
other two rigs when measured
in
the
lab
and
an
RF
GAIN
con-
trol allows better use of this
ext
ra
sensitivity.
Channel
indication
on all three rigs is by
brigh
t
red I.e.d.
displays
while
a meter indicates
"5"
levels
and r.f. power.
The
Lowe TX-40
has the microphone socket on the front
panel. Obviously
Lowe
's amate
ur
experience
has rubbed off
on their CB
rig
as the mic socket is of th
e
metal
-bodied
screwed
-ring
type as
'o
pposed to the more
commonly
fitted
DIN types
.
The
Uniace
100
also has
a simi
la
r
mic socket fit-
ted but
th
e
Realistic is
fitted with
a
latching
type
DIN
socket.
Both
the latter rigs have the mic
socket
in
th
e
left
side of the
rig making
the mic lead
stretch
a long way
ac
ross
the
front
of the rig,
The Realist ic
's
mic lead
was
rath
er
on
the short
side to
make matters
worse.
In use,
all
three
rigs gave reasonable results using
a
mag
-
mounte
d
Avanti
Moonraker
antenna, Audio quality was
good, both transmit and
receive
and
the
squelch
controls
worked
well.
The handbooks
supplied
with
each rig
were
adequate
,
Lowe
's
being the best. giving the operator
in
formation
on
in-
stallation and antenna fittings. as well as full
operating
in-
structions. All three gave a full
circu
it
diagram
,
useful in
cases of repair being needed in the future.
The TR-7730
is
an incredibly compact, reasonably priced,
25-watt, 2-metre FM mobile transceiver with five memories,
memory scan, automatic band scan, and other convenient
operating features.
TR-7730 FEATURES
•
Smallest ever mobile
Measures only 5-3/4 inches wide, 2 inches high, and 7-3/4
inches deep, Mounts even
in
the smallest car, and
is
an ideal'
combination with the equally compact TR-8400 synthesized
70-cm FM mobile transceiver.
•
25
Watts RF output power
HI/LOW power switch selected 25-W or 5-W output
•
Five memories
May be operated
in
simplex mode or repeater mode with the
transmit
frequency offset
±600kHz.
The fifth memory stores
both receive and
transmit
frequency
independently.
Memory backup terminal on rear panel.
Memory scan
Automatically locks on busy memory channel and
resumes
when signal disappears or when SCAN switch is pushed.
Scan HOLD or microphone PIT switch cancels scan.
•
Automatic band scan
Scans
enti
re band in 5-kHz or 10-kHz steps and locks on busy
channel
.
Scan resumes when signal disappears or when
SCAN switch
is
pushed, Scan HOLD or microphone PIT
switch cancels scan.
•
UP/DOWN frequency control from microphone.
Manual UP/DOWN scan of entire band
in
5 kHz steps.
•
OHset switch
Allows VFO and four or five memory frequencies to be offset
±600
kHz for repeater access or simplex.
•
Four-digit LED frequency display
Indicates receive and
transmit
frequency.
•
S/RF bar meter and LED indicators
Bar meter or multicolor LEDs
shows
S/RF levels, Other LEDs
indicate
BUSY, ON AIR, and REPEATER offset.
•
Tone switch
HPW MUCH?
Lowe TX
-40.
Thi
s
rig will
cost you [55,00, and
is
available only from
Lowe Electroni
cs,
Ch
esterfield
Road
,
Matlock, Derbys. Tel:
06292817, to whom we extend our
thanks
for
the
loan
of the
review rig
.
Rea li
st
ic
TRC-200 1, Available from
Tandy
retail outlets
throughout
the UK
,
price [79 95, Our thanks to Tandy Cor-
poration
,
Bilston Road,
Wednesbury
,
W.
Mid
lands
WS
10
7JM,
for the loan of the review
rig
"
Uniden Uniace
100, Price
d
at [80.00,
th
is
rig
is
avai
lable
from
CO
Centre, 10
M
erton
Park
Parade, Kingston Road
,
London
SW19.
Tel:
01-544
5150 who we
thank for the loan
of the
revi
ew
rig
,
TR7730
£247.94 inc VAT. Carriage £5.00.
the
2
Practical
Wireless, August
1982
TlE DID£CTOD8 AND 8TAff
or
LOWl) £I£CTDONIC8
have pfea8ure in invilin8 you to their open day
8ATUDDAY
14th
AUCU8T
1982
with each new TB8400
a free
PS 10
I appreciate that not everyone has the
wherewithall to buy a TS780 at £748.00,
not everyone requires 70 cm and 2 metres
in one rig
.
However, 70 cm is a growing band and
there are many easy to use repeaters up
and down the country and, of course, SU8
and SU20 are popular Simplex channels
:
many more amateurs are finding out the
pleasures to be had on the less crowded
70 cm band. To those of you who already
own a 2 metre mobile rig which you don't
want to trade in or part with, then why not
consider a TR8400. At its new reduced
price of £299.00 the TR8400 is, without a
doubt, a good buy. Now, however, we are
giving away, free of charge, with each new
TR8400 bought, a matching power supply
- the PS10. Not only a power supply but a
high quality speaker also. The PS10 has
the necessary connections for memory
back up. Switch off the power supply and
rig but leave AC power on to the PS10 and
the backup indicating led remains lit and
the memory frequencies are retained.
So for those mobile moments, or sat atop
the free matching PS10 power supply in
the comfort of your own shack, then, for 70
cm
FM,
the TR8400 is the rig for you
.
TR8400
£299.00
inc
VAT
Carriage £5.00
Practical Wireless, August 1982
3

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