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The state of the art TCXO (Temperature Compensated Crystal Oscillator) UNIT for the Kenwood TS50, TS850, TS870, TS690, TS570D, TS950, TS450 and any other rigs that accepts the Kenwood SO-2 TCXO
I have developed this board as a aftermarked replacement for the Kenwood SO-2 (L77-1394-.5) TCXO unit, which is no longer available as original spare part:
The original Kenwood SO-2 TXCO UNIT, installed in a TS850
The new SO-2NG TCXO UNIT was designed for a improvement of the frequency stability and accuracy of many Kenwood rigs. If you looking for a solution to keep the frequency of your rig stable over a wide temperature range, then is a TCXO the right choise!
As replacment for the Kenwood’s SO-2, the new SO-2NG TCXO board was developed around a high stability TCXO module from Murata providing a high degree of frequency stability over a wide temperature range and a low noise linear voltage regulator, which can achive better results than the original Kenwood SO-2. Optionally is possible to use a SiTime Precision Super-TCXO with an amazing stability of ±0,1ppm.
The new SO-2NG TCXO UNIT:
- Output frequency: 20MHz
- Output level: 1,8 Vpp
- Frequency stability: ±0,28ppm (or with extra high stability option: ±0,1ppm)
- Operating Temperature Range: -20 to 70°C
- power supply requirements: 4,5 to 28 VDC, max. 3mA (or with extra high stability option: 4,5 to 12 VDC, max. 49mA)
- Frequency adjustment range: 90Hz (±5ppm) (or with extra high stability option: 100Hz)
- Board size: 20x20mm
The SO-2NG output signal spectrum:
The SO-2NG phase noise measurement results:
The SO-2NG output signal under load condition
The SO2-NG is 100% compatible with the Kenwood SO-2, with the same dimensions and all soldering pads are in the same location as on the original unit, which permit a easy installation. There are also a high quality multiturn trimmer for a fine frequency alignment of the transceiver after the installation of this board.
The new SO-2NG TCXO UNIT mounted in a KENWOOD TS850:
Installation notes only for SO-2NG with extra high stability option:
Due to the higher current consumption of the extra high stability option (±0,1ppm), a modification must be made on the following transceivers:
Kenwood TS850: Short the R93 on the PLL-Unit
Kenwood TS450/TS690: Short the R10 on the PLL-Unit
Kenwood TS870: Short the R504 on the RF UNIT:PLL
The SO2-NG TCXO is available from RF-SYSTEM‘s webshop.
For other questions please send me an email.