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Unfortunately, not all transceivers have inhibit input, Icom and Kenwood radios generally lack this important
feature. While with these radios fool-proof setup cannot be made, there is still some solution, better than do
nothing. In this case it is important to avoid non transparent keying (VOX, PTT over CAT, manual use of MOX
button) and route all PTT source signals through SMΩRF. Configure IN and OUT ports of SMΩRF for PTT,
POLARITY NORMAL. Connect OUT to the transceiver PTT input, and use IN port as only PTT input port. To IN
port connect your footswitch or PTT output of your computer interface.
If you are using our micro KEYER II or MK2R+, connect iLINK port of the SMΩRF to the iLINK port on the keyer.
Even for radios which don't have inhibit, this brings significant advantage, because both MKII and MK2R+
disables all modulation and signal paths (CW, PTT) when they receive protection alert over iLINK. Then only
remaining uncontrolled situation is when radio is manually switched to transmit state by MOX button in FSK
(RTTY) mode.
5
7
CONTROLS:
SOUND
1.
Selects sound for audible alarm alert.
CYCLE
2.
Sets number of sound repetitions.
LEVEL
3.
Sets volume of the sound.
TRY
4.
Allows to check the sound.
INPUT
5.
Sets IN port function.
PTT
INHIBIT
6.
INPUT POLARITY
Sets IN port active level.
NORMAL
REVERSE
OUTPUT
7.
Sets OUT port function.
PTT
INHIBIT
OUTPUT POLARITY
8.
Sets OUT port active level.
NORMAL
REVERSE
Please note, OUT port is open collector output of the small signal bipolar NPN transistor. OUT port is NOT
designed to key inductive loads (relays) or high voltage circuits (>24VDC, >100mA). It is perfectly suitable for all
above functions, but keep it in mind if you are going to experiment with your own designs. Damage caused by
improper use is not covered by warranty.
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Transceivers without inhibit input
1
– sets IN port to operate as PTT input.
– sets IN port to operate as INHIBIT input.
– sets IN port active level, active PTT IN = closed to ground, active INHIBIT = open.
– sets IN port active level, active PTT IN = open, active INHIBIT = closed to ground.
– sets OUT port to operate as PTT output.
– set OUT port to operate as INHIBIT output.
– sets OUT port active level, active PTT OUT = closed to ground, active INHIBIT = open.
– sets OUT port active level, active PTT OUT = open, active INHIBIT = closed to ground.
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