222 MHz

NEW 222 MHz transverter designed by DB6NT

The high-performance transverter TR222H with its outstanding specifications is the combined result of a circuit design using state-of-the-art components and of Kuhne Electronic's long experience in microwave transverters.
The TR222H is specially designed for demanding VHF Amateur Radio applications like high performance contest stations, but can be modified for professional use in the 200 MHz frequency range .
The receiver path is able to cope with very large interference levels from other transmitters, a situation common to contest sites with other high-power transmitters in the neighbourhood. To achieve optimum intermodulation and large-signal performance, the TR222H uses only one PHEMT RF amplifier stage with a noise figure of 0.3 dB and an output intercept point of >25 dBm. A triple resonator helix bandpass filter provides optimum rejection of out-of-band signals and a high-level ring mixer (LO + 17 dBm, 50 mW) with output diplexer converts the input signal to the IF band at 28 MHz. The overall gain in the receiver path was deliberately set to only 15 dB, as even high-performance HF transceivers have still large signal problems at 28 MHz. Low Noise Amplifier mounted directly at the antenna feed point, using separate receive and transmit cables. Here You need only one additional high-quality coaxial relay, as the TR222H provides a separate receiver input (N-Connector) and a sequencing.

The transmitter path uses a second 17 dBm ring mixer for upconversion from 28 MHz to 222 MHz, and two cascaded triple resonator helix bandpass filters are used to achieve an exceptionally "clean" transmit signal. The transmit amplifier class "A" uses state-of-the-art LDMOS transistors in the driver and PA stage and is designed for 60W output. To achieve optimum tranmitter intermodulation performance, an integrated ALC loop with overdrive indicator limits the peak output power to 25W. An output low pass filter provides a harmonic suppression of more than 60 dB.

The local oscillator signal for both transmit and receive mixer is derived from a temperature-compensated low noise butler oscillators boosted to 100 mW in a MMIC amplifier and applied to the receiver or transmitter mixer via a PIN switch.

- Aluminium case with a big dissipator
- including DC-Power and control cable
- Spurious and harmonic wave suppression better 60 dBc
- Side band noise figure of the oscillators max. -136 dBc/Hz @ 10 kHz

- Option 02: TX IF input power -20 dBm / 10…200 µW
- Option 03: RX IF Amplifier +10dB
- Option 04: Drive gain control on the front panel

	TR 222 H
Specifications
Type	TR 222 H
VHF Frequency range	222 ... 224 MHz
IF Frequency range	28....30 MHz
IF Input power	1....50 mW, internal adjustable attenuator | option 02: 10…200µW
PTT control	contact closure to Ground
Output	25 Watt @ 50 Ohm IM3@20Watt 32 dB IM3@5Watt 39 dB
Operating voltage	13,8 V DC (12 - 14 V)
Current consumption	typ. 6 A
RX Gain	typ. 15 dB output IP3 +11dBm
Noise figure	max. 0,8 dB NF
Dimensions mm	270 x 260 x 80
Case	aluminium
IF connectors	BNC - female
RF connectors	N - female
DC supply and control connector	SUB-D 9-polig

Special options on request

Backside of the transverter

Blockdiagramm

Accessories to order
TX - cable	RX - cable