I decided to measure how far off frequency JJI was by using the Data Pad Slope calculation. The flat tops of the square-wave amplitude corresponded to the rising slope of the saw-tooth phase, so I suspected that JJI had drifted to a frequency beyond SoftPAL's lock capture range. However, at 200 baud the amplitude had a strange square-wave variation, while the phase had a saw-tooth variation, which you can see in the screen shot below. This suggested the baud rate had changed to 200 baud. The amplitude at 200 baud was several dB stronger than at 100 baud. The default settings for JJI in SoftPAL (22.203kHz and 100 baud) were set some years ago and I suspected things might have changed, so last night I set SoftPAL to run two JJI signals - one at 100 baud and the other at 200 baud. Recently I thought I had better check it once more, since it might be useful for SoftPAL users in India and perhaps Japan. Normally, I don't bother monitoring the Japanese MSK transmitter JJI at 22.2kHz because it is not phase stable. Test Equipment Center is an approved supplier of New & Reconditioned Test Equipment to manufacturing, industrial service, military, governmental, and educational organizations worldwide.I decided a blog would be a useful way for SoftPAL users to share ideas and information related to using SoftPAL to measure VLF signals, so my first example describes a way to easily determine the frequency offset required for MSK signals not controlled by an atomic standard. Our trade-in, purchase, and consignment options are designed to return maximum value for your surplus assets. We Buy Test Equipment - Whether you have one item, or an entire warehouse to liquidate, Test Equipment Center offers a program to turn your test equipment assets into cash or trade-in credit for future purchases. Our technical service laboratory also offers repair support for many products purchased from other suppliers, inquire for details.
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