Play Meter

Issue: 1977 June 20 - Vol 3 Num 12

Staff
Rowe International of New Or-
leans is planning service schools for
June 28-30 . The schools will be
conducted by Rowe factory service
representatives .
Tuesday' s class will cover the R-81
solid -state phonograph and will take
place from 5:00 p .m. to 7:30 p .m .
Classes Wednesday and Thursday
will cover other Rowe products,
including the Model 406 cold drink
machine, the Model 530 Seville
cigarette machine, the Model 489
bag vendor and Rowe bill changers .
Classes both days will run from
3:00p.m . to 7:00p .m. Wednesday's
classes will be followed by a lock
demonstration by a representative of
National Lock, Thursday's by a
general question and answer period.
All classes will be held at the New
Orleans Rowe offices, 1601 South
Gayoso Street .
Because "today, more than ever,
the games industry, especially at the
operator level, has a critical desire
and need for updating older video
games," according to Joe York,
president, Venture Line is manu-
facturing two conversion logic
boards.
The two boards, the 6 PAC I and
the 6 PAC II, carry six games apiece
and are even interchangeable with
each other.
Installation is easy, according to
York. "For example, ifthe owner has
a wiring diagram for his game and
standard plastic plugs on his wiring
harness, we can probably make an
interconnect cable so he can plug
our board directly into his wiring
without having to cut or solder any
w ires," he said.
Both 6 PAC I and 6 PAC II carry a
pushbutton switch to allow the
player to chose the game he wishes
to play, after he has deposited his
quarter. And the video display cycles
through all six games during pre-
game so that passers-by can see the
variety offered .
Other Venture Line boards include
Casino, a video blackjack game for
from one to four players; Ace High, a
5-card stud poker game with player
controls for betting, raising, calling
and folding; and Breakaway, a take
off from the popular breakout type
games.
Venture Line has been producing
conversion equipment since 1975.
"We realized that there were so
many more 'pong' games being sold
compared to the newer video games
being slowly developed, and that the
industry basically had the bulk of its
finances tied up in only one type of
video game, " York said.
" In 1975, no company had any
conversion equipment," he added.
"The idea was there and we saw the
need arising faster and faster; the
time was right and the door was wide
open for somebody to offer a helping
hand to the industry .
"We decided then and there to
make available to the industry a
selection of video 'conversion' logic
boards," York concluded .
Re; Update for May 20. I must call
attention to an error in the article
about the Dynamo World Soccer
Tour . It mentions that John Gililland
is starting the World Table Soccer
Association and associates him with
Foos Noos.
John Gililland is not associated
with the World Table Soccer
Association, which is an inde-
pendent players (not necessarily
professional) association. The Dy-
namo Tour is not sanctionea by
W.T.S .A . Foos Noos, our official
publication, is part of the W .T.S.A.
membership package. Dynamo has
attempted to start their own players
association, but the W.T.S.A. or
Foos Noos is not a part of it.
Incidentally, I enjoy reading your
publication .
Joe McCarthy, President
World Table Soccer Association
Editor, Foos Noos
Publisher and Editor:
Ralph C. Lally II
Managing Editor :
RichardS . Dietrich
International Editor :
David Snook,
Editor, Coin Slot
Technical Editor:
Robin Minnear
Correspondents :
Roger C. Sharpe
Dick Welu
Mary Claire Blakeman
J .W . Sedlak
Randy Fromm
Art Direction :
Meyer Alewitz
Typography :
Skybird Typography
Circulation Manager :
Carolyn Desmond
Advertising Representatives:
Ralph C. Lally II
Carolyn Desmond
Advertising Production :
Don Randon
European Representative :
Esmay Leslie
Coin Industry PLAY METER, June 2,
1977 . Volume 3, No. 12. Copyright
19n by Skybird Publishing Com -
pany. Full editions of Coin Industry
Play Meter are published monthly the
first Friday of the month . The Update
news edition is published monthly,
the third Friday of the month .
Publishing offices : 4136 Washington
Ave ., P.O. Box 24170, New Orleans,
La . 70184 . Tel . 504 / 827-0320. Print-
ing offices: Gibbs Inman Co ., P.O.
Box 32030 , Louisville, Ky . 40232 .
European Offices : Play Meter Promo-
tions, 15 Great North Rd., Brook-
mans Park, AL9 6LB, Hertfordshire ,
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and Canada - $25; Europe and Japan
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multiple subscriptions : 2-9, $20 each ;
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may be reproduced without express
permission . The editors are not
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scripts .
Application to mail at second class
postage rates is pending at New
Orleans , La . and other mailing office .
Postmaster : Send form 3579 to Play
Meter, P.O . Box 24170, New Orleans,
La . 70184 .
member
MemYI Krakauer
(see story previous page)
Rowe-N.D.
Plans School
TECHNICAL TOPICS
BY Randy Fromm
Building a Field Strength Meter
For the field mechanic that works
on wall games, it is important to have
some method of testing and tuning
the R.F. (Radio Frequency) section
of wall game transmitters.
A weak transmitter will cause an
erratic game operation that can
lower the play appeal of an otherwise
reliable money-maker. A transmitter
that seems to work from one part of
the room but not in another, or one
that has insufficient range , is
probably not working to the peak of
its designed capabilities .
Since we already have a method of
determi'ling the presence of the R. F.
carrier and a procedure for testing
and tuning the audio section (see
Update for April and May 1977 and
Figure 3 below) , all that is needed for
a complete field testing service
procedure is a way to " peak " the
R.F . section. Peaking refers to the
process of maximizing the signal
strength in a circuit . In this case we
w ant to peak th e transmitter' s
output signal to give it maximum
rang e and reliability.
BwJding a Cheap
Field Strength Meter
Th e sch ematic in Figure 1 shows
an inexpensive and easily con-
stru ct ed R. F. detector circuit . This
devic e will sample the transmitter's
R.F . output and convert it to a D .C.
(Direct Current) voltage. When you
use this in conjunction with your
V.O.M. (volt-ohmeter) , you will have
a fi eld stiength meter that allows you
to read a relative output signal for the
transmitter and obtain a peak signal
indication while tuning the R.F .
circuits .
Just about any construction
method can be used to build the
detector . I built the prototype by
soldenng the component leads
together and wrapping the whole
thing in a wad of duct tape . The
ant enna is just an eight inch piece of
insulat ed wire . The device has been
ki cking around in my tool box for a
whil e now and has proven to be a
vauable aid in solving my wall game
problems .
An alternative and clearly superior
construction method would be to
use a small piece of vector board
(perf board) to mount the com -
ponents and to attach clip leads for
connecting the meter . (See Figure
2. )
Testing the Detector
Set your V.O.M. to a low D.C .
scale (10 volts or lower) and connect
the meter as indicated by the
schematic in Figure 1. The detector's
antenna may be placed near, or
wrapped around the transmitter's
antenna. When energized, a working
transmitter should cause a meter
deflection. If you find that your
meter is not sensitive enough,
ground the transmitter and the
detector together by connecting the
negative meter lead to the metal base
which serves the " ground plane" of
the transmitter. This will increase the
output voltage
circuit .
of
the
Tuning the R. F. Section
Tuning the R.F. section of a wall
game transmitter is an easy two-step
operation with the use of your new
field strength meter.
Variable tuned coil L-2 is used to
peak the R.F. input to the final R.F.
amplifier. To adjust L-2, melt the wax
on the coil by touching it with a hot
soldering iron . Insert a hex alignment
tool, energize the transmitter, and
adust the slug for a peak reading on
thea meter. Remelt the wax to lock
the slug in place .
Tuning capacitor C-9 peaks the
R. F. output ofthe final amplifier. Use
a plastic screwdriver to adjust C-9
and obtain a peak reading on the
meter .
That's all there is to it!! The
process is so simple that a trans-
mitter can be tuned for maximum
output in the same amount of time
that it takes to change batteries.
+
A N TE NNA ca '' l
FIG .2
R.f. DETECTOR CIRCUIT
, IMH
METER-
METER+
detector
D
D
FH3.3

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