92. TRANSVERTER 5760 MHz MINI4. R3GC. 2019. Awaiting components.

The transverter is designed for amateur radio communications in the 6 cm microwave range together with a 430 MHz transceiver. On a factory-made printed circuit board, the assembly and setup of the transverter is not very difficult and takes a minimum of time.

Thanks to the use of inexpensive modern microcircuits

SKY85703-11: 5 
GHz WLAN Front-End Module the number of radio components and the 
size of the transverter are minimal. 
Only 2 multifunctional SKY85703 microcircuits are used in the RX/TX microwave path. In the reception mode NF=2.7 (according to 
documentation), in the transmission mode 100 mW (actually up to 200 mW). With such 
power and a small antenna, communications at a distance of 100-200 km are possible. For 
long-distance communications, you can purchase a 5W WI-FI 
amplifier on Aliexpress.

The maximum output power of this amplifier is about 3.5 W. But this is with 600 mW supplied to the amplifier input. When connecting a transverter with a power of 100 mW, the amplifier output is about 3.2 W. With this power and an antenna with a diameter of 55 cm from satellite television, communications were carried out at a distance of more than 300 km.

Photo of WI-FI amplifier. 
Without reworking this amplifier, CW and FM operation is possible. To operate in SSB mode, the unit must be forcibly switched to TX mode.

Since the WI-FI antenna block has its own LNA, the gain of the block is sufficient to place it directly next to the antenna feed, and install the transverter behind the parabola. The WI-FI amplifier and transverter can be connected with a cable up to 3 meters long. The cable must have low losses.

For almost full amplifier swing, 100 mW power is enough. 

If there is excess power at the input of the WI-FI unit, its protection will start to work. This will be visible by the chaotic operation of the LEDs. In this 
case, it is necessary to reduce the power. With the correct signal level, the green (TX) and red (RX) 
LEDs on the WI-FI unit should work clearly.

To reduce the cost, the transverter uses a temperature-compensated reference generator installed on a separate board. At a frequency of 5.7 GHz, the frequency drift depending on the temperature is no more than 5 kHz.

The support board is raised above the main board. This is done so that it can be covered with foam on all sides for better stability. 
To increase frequency stability, a more expensive ISOTEMP thermostatic generator can be installed in the transverter. Such generators are manufactured from the factory with precise frequency settings and do not require adjustment.

ISOTEMP generators and others with similar pin locations
are installed directly on the transverter board. With the ISOTEMP generator, the transverter is powered by 12V. With a temperature-compensated support, the transverter can be powered by an 8V source to reduce heating.
It is possible to install other types of generators via a transition board.
PTT signal is a constant voltage of 8-15 volts. The PTT circuit is isolated from the case. For a simple connection, connect + PTT to the plus of the power source, and connect minus to the PTT output of the transceiver. When the PTT signal is applied, the color of the RX/TX LED should switch. Since this LED is included in a high-resistance circuit, its brightness is low. If you need greater brightness, you can use ultra-bright LEDs.
For FM operation, PTT can be left unconnected. The transverter switches to 
transmission from the HF signal. For SSB mode, the PTT signal is mandatory. 
On the transverter board, the REL contact is used to control an external relay 
or a switch board. 
The synthesizer firmware provides for an IF frequency of 144 MHz, but some 
SM2600 VCOs may not cover this frequency.
Jumper JP1 sets the IF and reference frequency. With the jumper installed, the IF frequency is 144 MHz. If the jumper is not installed, then 430 MHz.
Switch: 
The transverter has one antenna input. It is used in the 
reception and transmission mode. This output is compatible with WI-FI amplifiers. In case of 
need to connect an external LNA and power amplifier to the transverter, a switch is required.
The switch is assembled on a separate board. Allows to make separate RX/TX outputs. The SPDT AS225, SKY13377-313LF or other similar microcircuit in the same case is used as a microwave switch.

TRANSVERTER 5760MHZ MINI4 - Share Project - PCBWay