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Ham Radio 2000 #2
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Ham Radio 2000 - Volume 2.iso
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HAMV2
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HF
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DXH52ENG
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LPT_232.TXT
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1997-01-04
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7KB
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140 lines
PC<->RTX INTERFACE CIRCUITS FOR DXHUNTER (CT compatible)
FUNCTIONS: PTT (VOICE KEYER) OR CW KEY VIA RS232 OR LPT
------------------------------------------------------------
A NPN transistor needed: BC337, 2N1711 or equivalent
1) - Serial port connection (COM1 .. COM8)
/-------------o Jack Hot
1 Kohm B |/ C
DTR o---------/\/\/\/--------|
|\
\ E
|
|
GND o----------------------------O------------o Jack Gnd
PC connector must be 25 pins or 9 pins, female.
Involved pins, depending on connector tipe are:
DB25 DB9
--------------------------
DTR pin 20 pin 4
GND pin 7 pin 5
Where DB25 is the 25 pin connector, DB9 the 9 pin connector
2) - Parallel port connection (LPT1 .. LPT4)
o----------------- E C -------------o Jack Hot
Strobe \ /
\ /
--------
|
1 Kohm |
o------/\/\/\----------|
Slct
o-----------------------------------------o Jack Gnd
Gnd
PC connector must be 25 pins, male.
Involved pins:
DB25
----------------
Strobe pin 1
Slct pin 17
Gnd pin 18
--------------------------------------------------------------
A circuit is here suggested to have both PTT and Sound blaster
audio switch to RTX Microphone; in addition a TTL/RS232 logical
conversion is performed (RTX TTL 0/5 V <-> +12/-12 V RS232 PC).
This circuit, alone, enables all DXHUNTER'S interfacing needs.
NOTE* DXHUNTER Drives DTR while performing voice Key functions
(if a serial port has been specified into file SBLASTER.INI)
while it drives only TXD line during transmission of frequency
and mode to remote RTX, RTS goes high during data transmision,
DTR is not influenced; so you could use the DTR line of the
same port also as a CW KEY: in this case you must add a second
transistor switch to pin 4 (20) and 5 (7) of RS232 PC connector
following the first scheme listed above, in this section; you
could then select one switch (SB audio) or the other (CW Key)
by acting on an external deviator.
- + ┌───┐
┌───────*──┤├┐ Gnd▀ │ ┌─────────────────────────┐ RS232->PC
Gnd│ │33uF│ │ │ ┌──────────────────────┐│ ┌─┐
▀ │ *──────────┐ │ │ │ ┌───────────TDttl │└───┤R│2 RD
│ │ ┌─┤├──* │ │ │ │ ┌───────RDttl └────┤S│3 TD
9÷15Vcc ┌──┴──┐ │ │+ - │ │ │ │ │ │ ┌────RTSttl ┌───────┤2│4 DTR P
┌──────*───*─┤7805 ├─* │ 22uF│ │ │ │ │ │ │ ┌─CTSttl │ Gnd▀──│3│5 Gnd C
│4700nF│ │ └─────┘ │ │ 16┌■─■─■─■─■─■─■─■┐9 *───────┤2│6 DSR
│ ┌┤├┘┌┤├┘ ┌┤├┘ │ ) Max 232 │ │ ┌───│ │7 RTS
│ │ │ 220uF │ 4700nF│ └■─■─■─■─■─■─■─■┘8 ┌─────┼───┼───│P│8 CTS
│ ▀ ▀ ▀ │ 1│ │ │ │ └┐│ │ └─────┘ │ │ ─┤C│9 RI
│ Gnd Gnd └─────┼─┘ │ │ ││ └─────────────┼───┘ └─┘
│ 22uF└─┤├┘ └┤├┘└┤├┐+22uF │
│ + +22uF ▀Gnd 1N4148│
│ ┌───────┤──────┘
│ External switch │ ┌──────┐ C
│ ─┴─ en./disab. │ │Box R │ T
│ PTT ┌──° °──────────────┘ │4÷8ohm│ S
│ ┌─────────────────┼──┐ 10K Trimmer └─┬┬───┘ ┌────┐ t R
│ │ ┌──────┐ │ │ c ┌╨┐ ││ │S B│ t T
│ │ ▀Gnd ┌┴┐4│ │ ┌>┤ ├─────────────────┼*─────┤o l│ l S
│ │ │ │7│ │ │ │ ├─────────────────*──────┤u a│ │ t T
│ │ └┬┘K│ │ │ └─┘ │n s│ │ t D
│ │ ┌───────────*──┘ │ │ ┌──────┤d t│ │ l t R
│ │ ┌┴┐ PTT │┌┘ Sb out │┌─────┤ e│ │ │ t D
│ │ │ │10K c ─┬─ ││ ─┬─ ││ │ r│ │ │ l t
│ │ └┬┘ b┌────┐ ┌─°│°─┘└─°│°──────┤├────┐ ┌─┴┴───┐ └────┘ │ │ │ t
│ │ └────█ │ ▀ ┌┴──────┴─┐ 0,010uF │ │Box L │ │ │ │ l
│ │ TR1 e└─┐ │Gnd│uRelay12V│ │ │4÷8ohm│ │ │ │ │
│ │ Gnd▀ │ └──┬─────┬┘Micro Relay│ └──────┘ │ │ │ │
│ │ BC317 └──────*──├─*+ │ │ │ │ │
*───┼──────────────┐ 1N4004│ │ │ │ │ │
│ ┌─┴────────────┐ └──────────┘ │ │ │ │ │
│ │PTT Mic ├─────────────────────────┘ │ │ │ │
│ │ CTSttl├───────────────────────────────────────────────┘ │ │ │
│ │ RTSttl├─────────────────────────────────────────────────┘ │ │
│ │ TDttl├───────────────────────────────────────────────────┘ │
│ │ RDttl├─────────────────────────────────────────────────────┘
└─┤12Vcc │
┌─┤Gnd │<-RTx TTL serial port
│ └──────────────┘
▀
┌─────────────────────────────┐ ┌────────────────┐┌──────────────────────────┐
│ MAXIM MAX232 │ │ Micro Relay ││ N O T E S │
│pin function│pin function│ │ 12 Vcc ││ │
├────┴─────────┼────┴─────────┤ ├────────────────┤├──────────────────────────┤
│ 1 = C1+ │ 9 = R2out │ │ Must have 2 ││ * = Circuit junction │
│ 2 = V+ │ 10 = T2in │ │ ways. ││ │
│ 3 = C1- │ 11 = T1in │ │ 1 for PTT ││ Box = Sound Blaster or │
│ 4 = C2+ │ 12 = R1out │ │ 1 for Sb out ││ PC loudspeaker │
│ 5 = C2- │ 13 = R1in │ ├────────────────┤│ │
│ 6 = V- │ 14 = T1out │ │ TR1= BC317/237 ││ │
│ 7 = T2out │ 15 = Gnd ▀ │ │ NPN ││ Switch= Ext.switch to │
│ 8 = R2in │ 16 = +Vcc │ │ ││ enab./disable PTT │
└──────────────┴──────────────┘ └────────────────┘│ and Sb out->TX Mic │
┌────────────────────────────────────────────────┐│ │
│ HF RTx ││ ▀ = Gnd (ground) │
├────────────────────────────────────────────────┤│ │
│Mic = RTX microphone input (RTX rear panel) ││ Trimmer= 10Kohm │
│PTT = Push To Talk (RTX rear panel) ││ This trimmer is needed │
│ ││ to adapt Sb audio out │
│12Vcc= RTX power source ││ level to RTX Mic input. │
│▀ = Gnd (Power source ground) ││ │
│RTX must be equipped with a serial (TTL) port ││ │
│ ││ │
│The 2 ways relay, switches Sb Audio out to ││ │
│RTXMic input and PTT to the "on the air" status,││ │
│when DTR line goes high. ││ │
└────────────────────────────────────────────────┘└──────────────────────────┘
THE DXHUNTER: THE SOFT WAY OF HUNTING!!!.