TR 432 H
70 cm Transverter with excellent large signal performance
432 ... 434 MHz
Over 25 years of experience in development of new transverter technologies led to this masterpiece of VHF technology. Implementing technological innovations and expertise in a timely manner and combining them into a state-of-the-art product is a thing we have succeeded in doing in a very impressive way. It's a challenge for us to extend the limits of what is technically feasible and to put this into our products. Ranking first worldwide and improving our products continously are a matter of course for us.
The new design of our 70cm transverter for 432 MHz features better performance and new functions.
An external 10 MHz reference frequency can be connected to achieve highest frequency accuracy now. This is necessary for EME and WSJT. The frequency of 10 MHz can be supplied by a highly stable OCXO, a reference oscillator of a frequency counter, a rubidium frequency standard or a GPS controlled frequency source.
The new version of the 70cm transverter TR 432 H also includes the switches to configure the IF connectors of the transverter. The TX IF input ranges and the IF connector configuration can be done with the internal switches of the transverter. So the transverter is compatible to most of the used HF transceivers with transverter output. The drive gain control on the front panel is standard now.
A temperature-compensated low noise butler oscillator generates the 101 MHz LO signal. A thermostat crystal with a 40 °C precision crystal heater is used. The phase noise of the multiplied oscillator signal with a frequency of 404 MHz is -140 dBc/Hz @ 10 kHz. This value is better than that of the HF transceivers. The oscillator output power is more than 50 mW.
In the receiver frontend there is only one balanced super low noise stage. A noise figure (NF) of 0.8 dB and an output IP3 of 37 dBm are achieved. To prevent interference in case of multi-band operation, there is a bandpass for the 70cm band at the input. The prestage is followed by a high-Q helical filter and a matching network. A high-level double-balanced ring mixer with an IP3 of 30 dBm converts the signal to the intermediate frequency (IF) at 28 … 30 MHz. The total gain of the receiver path is limited to 20 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 432 A is recommended. This drops the total noise figure to 0.5 dB. A second N-connector permits the use of a separate cable for the
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. Two helical band pass filter ensure best spurious rejection. The mixer output signal will be amplified with two MMIC amplifier stage. LD-MOSFETs are used in the driver amplifier and the power amplifier. To achieve optimum intermodulation performance, the output power of the oversized power amplifier is limited to 20 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.
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.
|Type||TR 432 H|
|Frequency range||432 ... 434 MHz|
|IF frequency range||28 ... 30 MHz|
|IF input power||1 ... 50 mW adjustable / internally switchable to range 60 ... 1000 µW (-12 ... 0 dBm)|
|LO accuracy @ 18 °C||typ. +/- 2 ppm, max. +/- 3 ppm (without 10 MHz reference frequency)|
|LO frequency stability (0 ... +40 °C)||typ. +/- 2 ppm, max. +/- 3 ppm (without 10 MHz reference frequency)|
|PTT control||Contact closure to ground|
|Output power||20 W|
|Supply voltage||+13.8 V DC (+12 ... 14 V DC)|
|Current consumption||typ. 6 A (TX)|
|RX gain||typ. 20 dB|
|IP3 out||typ. +30 dBm, min. +27 dBm|
|Noise figure||typ. 1.8 dB|
|External reference input||10 MHz / 2 ... 10 mW|
|IM-Dynamic||typ. 98 dB SFDR @ 3 kHz BW|
|Dimensions (mm)||270 x 260 x 80|
|IF connectors / impedance||BNC - female / 50 ohms|
There are two separate IF connectors. They can be switched to one common IF connector
|RF connectors / impedance||N-female / 50 ohms|
|DC supply and control connector||SUB-D 9-pole|
- Additional input for 10 MHz reference frequency
- Automatic activation of PLL if external 10 MHz signal is supplied
- Switchable IF input power range• There are two separate IF connectors. They can be switched to one common IF connector
- Aluminium case with a big heat sink
- Inside wiring with silver plated Teflon coaxial cable
- Antenna relay with 60 dB cross-talk attenuation
- Converter can process large signals
- Extension with additional filters and other components
- Built-in directional coupler for calibrated power output control
- 5-pole low-pass filter for harmonic wave suppression
- Spurious and harmonic wave suppression better 60 dBc
- Phase noise of the oscillator better -140 dBc/Hz @ 10kHz
- Built-in sequence control
- Including dc-power and control cable
- RX cable
- TX cable
- IF cable
- MKU LNA 10 IFA Reference frequency amplifier for connection on a IC-7700 or IC-7800
- As a 10 MHz frequency source we recommend the GPS-stabilized oscillator by James Miller, G3RUH or the 10 MHz GPS-Frequency Standard by ID Elektronik, DK2DB
- GPS stabilized 10 MHz oscillator (James Miller, G3RUH)
- 10 MHz GPS-Frequency Standard (ID Elektronik, DK2DB)
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- Specifications subject to change without notice -