PC TX

PC

i—i    10 Kohms

DTR

C

TW¹-

RTS 2.2 Kohms ^

2N2222

-O

PTT

DSR

///)///

or

CTS

DB9

serial port

o ^M1C

O

Use DTR&DSR with left channel Use RTS&CTS with right channel

i⁺ 10 uF-25V

X

Opiional capacitors

^Left or Right_⁺. ■ 10uF-25V

Sound card

Modę Simplex Ftx=Frx

PC

i—i    10 Kohms

DTR

C

TW¹-

RTS 2.2 Kohms ^

2N2222

Sąuelch

TRI

Spla-

^O

⁽0D⁾

Mic

-O

-O

PTT

Gnd

TX

DSR

-©

or

CTS

DB9

serial port

10 uF-25V ⁺i

___iuur-^jv 11_

^ from Spkr [Left or Right)

-O

Mic

O

Z

Opiional capacitors ,,⁺ 10 uF-25V

—I to Mic or Linę (Left or Right) Sound card

Sqlc

Spkr

-O

RX

Use DTR&DSR with left channel Use RTS&CTS with right channel

Modę Duplex Repeater

Ftx # Frx (Same band or different bands)

Notes

Ali connections shielded and grounded as shown in simplex sketch

In Duplex modę, the sound card must be set so that its input signals are rerouted to its speaker outputs. (See vour Windows Sound settings for that) DTR and RTS signals are +12V when set and -12V when re set .DSR and CTS are set with+9V to +12V and re set at 0V.

The isolation capacitors between sound cards and transceivers are not mandatoiy if they already exist inside your eąuipments Ethe COMportis aDB25, the pin allocationis : DTR=20, RTS=4, DSR=6, CTS=5, Gnd=7 In Duplex Transponder, use the stereo LINĘ inputs because Mic input of the sound card is not stereo

Usually, the tip contact of a 3.5" stereo jack is the left channel, the middle contact is the right channel and the the rear contact is ground DSR or CTS must be HIGH when active. If your sąuelch signal is Iow when sąuelch is open, insert an inverter between sąuelch and COM port In Duplex Repeater+Transponder, if you want TRX2 to be priority holder just set 'Priority on right channel' in the relevant menu of SIMPLEX.

In Duplex Repeater+Transponder, both sound cards outputs and TRX mic inputs are connected together.

E audio is coming from the non-priority TRX2, this TRX2 will not receive the PTT command and will remain in receive modę.

Sketched by Gabriel F6DQM