microHAM micro KEYER 2R Manual page 48

PA PTT is available at the MK2R rear panel RCA jack and is designed for switching a power amplifier. PA
PTT is enabled by checking the PA PTT box. PA PTT will close before transceiver PTT by the
amount of selected PTT Delay and will open at the same time as the transceiver PTT.
Note: PTT delay should be a few milliseconds longer than the T/R delay of the amplifier.
LNA PTT is available at the MK2R rear panel RCA jack and is designed for bypassing a low noise
preamplifier (LNA) or disabling receive antennas during transmit. LNA PTT is enabled by checking
the LNA PTT box. LNA PTT closes before the transceiver PTT by the PTT Delay value and opens
after the transceiver PTT by the same amount.
PTT operation is crucial to successful operation when interfacing with application software. MK2R can
operate in one of two modes: Fixed or Follow Radio. The mode used for each radio can be selected
independently.
TIP: Whenever possible, if Router is capable of decoding your radio's operating mode (Ports |
Set) use Follow Radio
settings for each operating mode.
When Router is unable to determine the operating mode, Fixed PTT is used. There are several options
based on operating style:
1. CW, VOICE (PTT1 immediate).
PTT1 (and PAPTT, if enabled) are activated immediately. Additional delay is not necessary if the
application's internal timing provides some delay between PTT and start of message. Don't forget
to set this delay in the application set-up.
2. QSK CW, VOICE VOX (No PTT)
PTT1 and PTT2 are disabled.
3. FSK, DIGITAL (PTT2 delayed)
PAPTT will be activated immediately and PTT2 will be activated with the delay defined in PTT
delay. This unique feature of microHAM products prevents hot switching during FSK operation.
Because a radio in FSK operation begins to produce RF as soon as it enters the transmit mode, the
application program cannot guard against hot switching.
When Router is able to detect the radio mode, use Follow Radio. The same settings are available as in
Fixed mode but switching between them is automatic based on the radio mode. The operating mode
detected mode is displayed on the Ports tab and classified VOICE, DIGITAL, FSK or CW. The chosen
switching is indicated by black frame around the selected mode.
VOICE modes are: USB, LSB, AM and FM.
–
Two choices are available, (PTT1 immediate)
and (no PTT). PTT1 Immediate is
recommended.
CW modes are: CW and CW-R. The two
–
choices are (PTT1 immediate) and (no PTT).
No PTT should be used for QSK operation
only.
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described below. It will provide automatic selection of the best PTT
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