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Operating Instructions
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Assembly Instructions for the Z90 & Z91. This is a 2.2 MB file, with
reduced graphics resolution. The current edition is 2.0, revised 19 Oct
2006.
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Corrections and Updates to the Assembly Instructions. The most recent
errata to the printed Assembly Instructions.
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Component Placement shows
where each component is placed via an XY grid system with an index to
schematic part identifiers.
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Z90
& Z91
Schematic
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Z90 & Z91 Annotated
Schematic for troubleshooting.
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Updating
the Z90 Firmware describes the MicroLoader and procedure for flashing
new firmware in the Z90's PIC18F4620 microcontroller.
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Crystal
Motional Parameters. This is not a polished, ready-for-publishing article, but is more of a summary of my workshop notes, with photos and plots.
It describes the results of a variety of approaches to measuring quartz
crystal motional parameters, with results compared against a Saunders &
Associates Reference
Crystal.
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Z10010 4.915 MHz
Filter Operating Instructions for the K2 IF bandpass filter. Updated 07
October 2006.
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Z10000-K2 and Z10000-U buffer amplifier manual
is now posted. Version 3.1, updated 11 May 2008 and should be the final version, absent some small corrections. This is a
2 Mb PDF file. The second run (2008) Addendum is available by clicking
here. The Addendum
material has been incorporated into the main manual in version 3.1. (Version
3.1 requires Adobe Reader 6 or later.)
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Filter Grounding
Comparison provides measurements of the Z90 in both 200 and 1000 Hz RBW
modes for three alternative crystal grounding configurations. In the case of
the Z90, no significant difference is seen between top bus grounding and
individual bottom crystal grounding.
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Elecraft K2
Transceiver Response in SSB Mode to Tone Burst. To see how my K2 reacts
to a tone burst, I ran a test at varying audio levels on 7 MHz in LSB mode.
This is far from an exhaustive test, and it shows a relatively small degree
of overshoot and level oscillation.
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Z100 Operating
Manual. A PDF copy of the Z100 CW tuning aid manual.
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Z100 Schematic. PDF copy of
the schematic. (The Z100's firmware source code is available on the
Software page).
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Z100 Programming Cable (RS232 to
logic level). A simple home brew adapter cable for those not wishing to
purchase the recommended TTL232R cable.
