Kuhne electronic TR 144 H +40, Руководство пользователя

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TR 144 H +40
Oscillator
A temperature-compensated low noise butler oscillator generates the 116 MHz LO signal. A thermostat crystal with a 40 °C
precision crystal heater is used. Phase noise of the output signal is -156 dBc/Hz @ 10 kHz. This value is better than that of
the HF transceivers. The oscillator output power is 100 mW.
Receiver
In the receiver frontend there is only one balanced super low noise stage with two Power GaAs-FETs. A noise figure (NF) of
0.9 dB and an output IP3 of min. 40 dBm are achieved. To prevent interference in case of multi-band operation, there is a
notch filter for the 70cm band at the input. The prestage is followed by a high-Q helical filter and a matching network. A high-
level triple-balanced GaAs-FET ring mixer with an IP3 of min. 35 dBm converts the signal to the intermediate frequency (IF) at
28…30 MHz. The total gain of the receiver path is limited to 25 dB to avoid overdriving of the HF transceiver. An internal
preamplifier of the HF transceiver has to be switched off. The transverter provides excellent large-signal performance. Gain
and sensitivity are ideal for contesting and DXing. For EME operation the use of the preamplifier MKU LNA 144 A is
recommended. This drops the total noise figure to 0.35 dB. A second N-connector permits the use of a separate cable for the
preamplifier.
Transmitter
In the transmit path of the transverter a second 17 dBm ring mixer is used. The TX IF input power ranges (0.06 … 1 mW and
1 … 50 mW) can be set with an internal switch.
The TX gain of the transverter can be adjusted with the potentiometer on the front panel. For further power adjustments the
HF transceiver can be used. At the mixer output there is a matching network and a helical band pass filter. It is followed by an
MMIC amplifier stage, another helical band pass filter, driver amplifier and power amplifier. LD-MOSFETs are used in driver
amplifier and power amplifier. The available output power is 60 W. To achieve optimum intermodulation performance, the
output power is limited to 25 W. Overdriving is prevented by an ALC circuit. The transmit unit of the transverter has a
protection circuit. If the antenna SWR is bad, the power amplifier switches off for 3 seconds. This is indicated by a LED. A
final low pass filter guarantees spurious and harmonic rejection of more than 60 dB. The output power is indicated on a
calibrated meter.
Sequence Controller
The built-in sequence controller allows time-controlled operation of a high-quality power amplifier and a coaxial relay with a
preamplifier, which is placed directly at the antenna. The required connectors are on the rear panel of the transverter.
Accessories
RX-Cable TX-Cable ZF-Cable
Rear panel with connectors