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SO-2NG TCXO

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:

KenwoodSO2b

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 IQD FREQUENCY PRODUCTS 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 a amazing stability of ±0,1ppm.

The new SO-2NG TCXO UNIT:

20200118_160714-1024 20200118_161250-102420200118_161213-1024


SO-2NG Specifications:

  • Output frequency: 20MHz
  • Output level: 1,8 Vpp
  • Frequency stability: ±0,5ppm (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: 200Hz (±5ppm) (or with extra high stability option: 100Hz)
  • Board size:  20x20mm


The SO-2NG output signal spectrum:

SO2NGspectrum2

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

TS850_HSmod

 

Kenwood TS450/TS690: Short the R10 on the PLL-UnitTS450-690_HSmod

 

Kenwood TS870: Short the R504 on the RF UNIT:PLLTS870_HSmod


Availability:

The SO2-NG TCXO is available from RF-SYSTEM‘s webshop.

For other questions please send me an email.

Thanks!