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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, please 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 clamped (2 × BAT85) and then
amplified in two stages by means of MSA-0185 and
MSA-0885 Monolythic Microwave Integrated Circuits (MMIC). 1
The resulting signal is then fed to a U664BS 64:1 prescaler
that divides the frequency by 64 [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 the device
effectively, divides the input 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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The MSA-0185 to MSA-0815 range of MMIC devices was manufactured by Avantek,
who marked them with colour-coded dots.
After Avantek was taken over by HP in 1991, they were marked A01 — A08.
They are very similar to the later MAR-1 — MAR-8 devices from Mini-Circuits.
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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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- U664BS, 1,3-GHz-Vorteiler 64:1 (1.3 GHz prescaler 64:1)
Telefunken, 1973.
- NE592, Video amplifier
Philips, 15 April 1992.
- SN74167, Synchronous Decade Rate Multipliers
Texas Instruments, December 1972.
- MODAMP Monolythic Microwave Integrated Circuits (MMICs) - MSA Series
Avantek, Inc., 1988.
- BAT85 Schottky barrier diode
Philips Semiconductors, 20 March 1996.
- MSA-0185 Cascadable Silicon Bipolar MMIC Amplifier
5965-9693E. Hewlett Packard. Date unknown. pp. 6-258 — 6-261.
- MSA-0885 Cascadable Silicon Bipolar MMIC Amplifier
5965-9545E. Hewlett Packard. Date unknown. pp. 6-422 — 6-425.
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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: Friday, 01 August 2025 - 15:59 CET.
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