Specifications

able to the outside world. In
particular,
the
TEKK: KS-900, Kantronics DYP.
2-2
and
DVR
4-
10, and the
Yaesu FT-5100 are
9600
bps-connectable right out ofthe box.
Fortunately, it's
usually
not difficult
to
locate
the
connections needed for
9600
bps operation in most
mod-
ern FM transceivers. We'd like to thank Mike CLrrtis, WD6EHR, for compiling this
list and for the 9600
bps connection infbrmation that follows.
Radios
that are known to work at
9600
bps are:
Alinco
GE
Icom
Kantronics
DVR
2-2,4-10
Kenwood
Motorola
Standard
DR-1200,
DR-t
10, DR-il2, DR-l12T, ALR-72, ALR
709
MASTR
II
VHF with PLL exciter,
MVP VI{FruHF
rc- 22, 2s. 21
.
28, 38, 228, 21 1.
21
5,
290,
3200,
41 t, 41 s
TM- 2l |,212,221
,231
,
43t
,
62t,121,731
TR- 7500,7700
TS- 700,110,190
MICOR
UHF,
MITREK
c58, Cl40
TEKK KS-gOO
Yaesu FT-212,221,230,736
Some radios-such as the ICOM 228 &229-have IF filters that are too
narow to successfully
pass
9600
bps
receive
data.
In
this case,
you
can either use a different
radio
or
install a wider filter.
MuRata-Erie
(2200Lake
Park Drive, Smyrna GA 30080) makes ceramic filters-the SF series
is designed for data com-
munication. If the filter is
physically
and electrically compatible with the existing
filter in the transceiver,
the SFH450D is recornmended.
Yaesu USA also makes available IF filters. Presentlv. thev sell the lollowins irlters:
Filter
Bandwidth
15
KHz
15 KHz
2O KIlz
20 KIlz
30 KHz
MuRata-Erie
Part Number
LF-HI55
cFw-4558
LF-H20S
cFw-455D
cFw-4558
Yaesu
Part Number
H3900204
H3900200
H390020s
H3900203
H3900201
Many modem
rigs are true
FM,
so it's relatively simple to add a 9600 bps
port-you
need only a couple
of
internal connections and decoupling components to bring out the
"raw"
FM of the transceiver:
the direct
detector
output and direct
FM modulator
input.
Most modern
rigs use receiver chips
such as the
TA776lFlP,
LA5006M,LC7532M,TK10420,TK10424,
MC3357P.
and others.
Ncnn:
All of the chips mentioned here use
pin
9
for
the detector output-others may or may not,
so check
Jirst!