MKU 70 G2

Transverter module for the 4 m Band - 70 MHz

69.9 ... 72 MHz

Combinations of HF transceivers and transverters provide high input sensitivity, good large signal performance, excellent phase noise values and low intermodulation distortion. Usually, the performance is much better than that of modern VHF transceivers. The high performance transverter module MKU 70 G2 is based on several decades of development and production of transverters. Its outstanding technical data makes it usable for many applications.

Technically skilled customers can set up their own 70 MHz transverter system with the transverter module and one of Kuhne electronic's power amplifiers MKU PA 70 HY. The transverter module MKU 70 G2 will work with most HF transceivers, which have a transverter output port. Due to switchable input power range and connector configuration, the module is very flexible.

Oscillator

A temperature-compensated low noise butler oscillator generates the 42 MHz LO signal. A thermostat crystal with a 40 °C precision crystal heater is used. The phase noise of the oscillator signal is -156 dBc/Hz @ 10 kHz. This value is better than that of the HF transceivers. The oscillator output power is more than 50 mW.

Receiver

In the receiver frontend a high-quality band pass filter with high selectivity is used to prevent interference  in case of multi-band operation. In the frontend of the converter there is only one low noise stage with a noise figure (NF) of 0.8 dB and an output IP3 of +28 dBm. The frontend is followed by a helical band pass filter and a matching network. A high level schottky diode ring mixer converts the signal to the intermediate frequency (IF) at 27.9…30 MHz.

Transmitter

In the transmit path of the transverter a second high level ring mixer with an adjustable attenuator is used. The IF input power is adjustable between -12 … +17 dBm (0.06 … 50 mW). 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 and a second helical band pass filter. The final output driver amplifier is able to generate 100 mW output power.

Dimensions as PDF

Specifications
Type	MKU 70 G2
Frequency range	69.9 ... 72 MHz
IF frequency range	27.9 ... 30 MHz
IF input power	2 ... 50 mW, adjustable / switchable to range 60 ... 2000 µm
LO accuracy @ 18 °C	typ. +/- 2 ppm, max. +/- 3 ppm
LO frequency stability (0 ... +40 °C)	typ. +/- 2 ppm, max. +/- 3 ppm
Output power	min. 100 mW
IM3 of output signal	max. -40 dBc @ 200 mW PEP
Spurious rejection	min. 60 dB
Harmonic rejection	typ. 40 dB
RX gain	typ. 25 dB
Noise figure @ 18 °C	typ. 1.5 dB
RX output IP3	typ. +26 dBm
PTT control	+12 V DC für TX
Supply voltage	+12 ... 14 V DC
Current consumption	typ. 370 mA
Dimensions (mm)	150 x 55 x 30
Case	German silver
Coaxial connectors IF / impedance	SMA-female, 50 ohms There are two separate IF connectors. They can be switched to one common IF connector.
Coaxial connectors VHF / impedance	separate RX/TX connectors, SMA-female, 50 ohms
DC-supply and control connector	Feed-through capacitor with solder pin
Weight	typ. 200 g

Block diagram

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