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RCD Essa
30 MHz to 1 GHz ÷100 prescaler
- this page is a stub
The device shown here divides the input frequency (30 MHz to 1.3 GHz)
by 100, so that it can be fed to a lower frequency device, such as an existing
frequency counter.
It was developed by Essa Electronics in IJmuiden (Netherlands) especially for
the Dutch Radio Monitoring Service (RCD) [2].
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This page currently acts as a placeholder for future information about
the Essa 100 prescaler. If you have any further information about this
device, plase contact us.
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The prescaler shown here was developed by Essa in 1997.
It extends the input frequency of a lower-frequency device to
approx. 1.3 GHz. The block diagram below shows how this is done.
The signal from the antenna is first amplified and then fed to a
U664B 64:1 prescaler [a].
It is then amplified in an NE592 wideband video amplifier [b],
and fed to two cascaded SN74167 synchronous decade rate multipliers [c].
These multiply the signal by 64/100. This means that
effectively, it divides the intercepted frequency by 100.
The original input range (30 MHz - 1.3 GHz)
is converted to the 300 kHz - 13 MHz range before it is fed to the
connected device.
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Device Prescaler Purpose Dividing the input frequency by 100 Manufacturer ESSA, SPI Year 1997 Customer RDR/HDTP (RCD) Frequency 30 MHz - 1.3 GHz Dimensions ? Weight ? Quantity ?
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- Anonymous donor, Essa Prescaler - THANKS!
April 2009.
- SPI website, List of products ... since 1983
Retrieved April 2019 (via WayBack machine).
- Rob Keij, Essa/SPI director
Personal correspondence, April 2019.
- Anonymous former user, personal correspondence
October 2024.
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© Crypto Museum. Created: Wednesday 11 December 2024. Last changed: Wednesday, 11 December 2024 - 19:06 CET.
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