diff --git a/.gitignore b/.gitignore
index 747d42e..cf4603d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -301,3 +301,6 @@ TSWLatexianTemp*
 # Uncomment the next line to have this generated file ignored.
 #*Notes.bib
 
+Makefile
+latex.mk
+*.pdf
diff --git a/README.md b/README.md
index 49ac199..ebbe632 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,40 @@
 # logsheet-tex
 
-Printable logsheet for amateur radio operators in tex
\ No newline at end of file
+Printable logsheet for amateur radio operators in tex
+
+## Description
+
+With this latex file you can create a print template for an amateur radio
+logsheet. By default you fold a DIN A4 paper in half and get four A5 papers in
+portrait mode for the logsheet. These A5 sides are all enumerated with the
+number as watermark.
+
+Your callsign can be a watermark across the background. If the sheet is for
+trainee logging, there will be "Location+OP" in the heading.
+
+
+## Setup
+
+### Prepare build system
+
+* Download Makefile for typesetting LaTeX documents from
+[https://github.com/tueda/makefile4latex/](https://github.com/tueda/makefile4latex/raw/refs/heads/master/Makefile)
+
+Of course you can use your own method of using LaTeX.
+
+### Config callsign/etc.
+* Copy latex.mk.example to latex.mk and adapt it for generating different pdfs
+* Config callsign via filename:
+** logsheet.DL1XXXX.tex will use callsign DL1XXXX
+** logsheet.DN1XXXX.trainee.tex will use callsign DN1XXXX and set Location+OP
+   in heading (for trainee callsign)
+** logsheet.DL1XXXX.tex will use callsign DL1XXXX/t and set Location+OP in
+   heading (for new (2024) german trainee callsign)
+* Configuration in the first section of logsheet.tex possible:
+** paper format
+** number of logging blocks on each page
+
+## Build
+With the build system: **make pdf**
+
+Otherwise: build the .tex files as you like
diff --git a/latex.mk.example b/latex.mk.example
new file mode 100644
index 0000000..c5eb13c
--- /dev/null
+++ b/latex.mk.example
@@ -0,0 +1,11 @@
+PDF_FILES=logsheet.DL1XXXX.pdf logsheet.DN1XXXX.trainee.pdf logsheet.DL1XXXX.traineestroke.pdf
+
+pdf: $(PDF_FILES)
+	$(MAKE) mostlyclean
+
+# create logsheet.CALLSIGN.var.tex from logsheet.tex
+logsheet.%.tex: logsheet.tex
+	cp -v $< $@
+
+# clear latex intermediate files for all generated files
+srctexfiles += $(PDF_FILES:.pdf=.tex)
diff --git a/logsheet.tex b/logsheet.tex
new file mode 100644
index 0000000..00e293b
--- /dev/null
+++ b/logsheet.tex
@@ -0,0 +1,194 @@
+% SPDX-License-Identifier: Beerware
+% Wolfgang DM5WK Kroener wrote this file. As long as you retain this notice you
+% can do whatever you want with this stuff. If we meet some day, and you think
+% this stuff is worth it, you can buy me a beer in return.
+
+\documentclass[12pt]{article}
+
+%
+% configure settings here
+%
+% configure paperformat here
+\def\paper{a4paper}
+\newlength{\rowheight}
+% configure height of lines
+\setlength{\rowheight}{9mm}
+% configure number of tables on each page
+\def\numtables{2}
+% margins of paper defined above
+\usepackage[\paper, hmargin=0.7cm, vmargin=0.9cm]{geometry}
+% define callsign here or with filename
+% e. g. \def\callsign{AB1CD}
+% if you define it here, callsign will not be taken from filename
+\def\callsign{}
+% is this for trainee logging?
+% set \trainee to trainee for trainee callsign
+% or to traineestroke to get \callsign/T
+% if you define it here, trainee will not be taken from filename
+\def\trainee{}
+
+%
+% normally no configuration below this line
+%
+
+\usepackage[utf8]{inputenc}
+\usepackage{lmodern}
+
+
+\usepackage{tabularray}
+\UseTblrLibrary{functional}
+\usepackage{functional}
+\NewColumnType{Y}{Q[c,m]}
+\NewColumnType{Z}{X[c,m]}
+
+\usepackage{pgffor}
+\usepackage{xstring}
+\usepackage{fp}
+% strip dimension of length and convert to mm
+\ExplSyntaxOn
+\newcommand\stripdim[1]{\dim_to_decimal_in_unit:nn{#1}{1mm}}
+\ExplSyntaxOff
+
+%split \jobname, extract after first dot callsign, after second dot: trainee
+% e. g. for logsheet.AB0CD.trainee.tex extract \callsign as AB0CD and \trainee as trainee
+% e. g. for logsheet.AB0CD.tex extract \callsign as AB0CD and \trainee is empty
+% put \callsign in watermark and add +OP in heading if \trainee equals trainee
+\StrCut{\jobname}{.}\strA\strB
+\StrLen{\callsign}[\lenTemp]
+\IfEq{\lenTemp}{0}{
+    \StrCut{\strB}{.}\callsign\strC
+}{
+    \StrCut{\strB}{.}\strTemp\strC
+}
+\StrLen{\trainee}[\lenTemp]
+\IfEq{\lenTemp}{0}{
+    \StrCut{\strC}{.}\trainee\strD
+}{}
+
+%add /t to callsign if filename is logbool.CALLSIGN.traineestroke.tex
+\IfStrEq{\trainee}{\detokenize{traineestroke}}{
+  \def\trainee{trainee}
+  \edef\callsign{\callsign/T}
+}
+
+% default scale if there is no callsign (\wmfontscale\paperwidth)
+\FPset\wmfontscale{0.25}
+
+\StrLen{\callsign}[\callsignlen]
+% calculations for callsign as watermark if there is one
+\IfEq{\callsignlen}{0}{}{
+  % calculate factor for fontsize for diagonal watermark
+  % (sqrt(w^2+h^2))/(w * factor * callsignlen)
+  % factor is for callsign going more or less over the whole diagonal
+  \FPset\w{\stripdim{\paperwidth}}
+  \FPset\h{\stripdim{\paperheight}}
+  \FPeval\wmfontscale{root(2,pow(2,h)+pow(2,w))/(w * 0.65 * callsignlen)}
+
+  % calculate angle for diagonal text
+  \FPeval\diagonalAngle{arctan(h/w) * 180/FPpi}
+}
+
+% pagenumber as watermark
+\FPeval\wmfontscalepagenumber{0.75*wmfontscale}
+\usepackage[svgnames]{xcolor}
+\usepackage{eso-pic}
+\usepackage{tikz}
+\usetikzlibrary{calc}
+\tikzset{every picture/.style={gray, opacity=0.1}}
+\newcommand\wmpagenumber{%
+  \AddToShipoutPictureBG*{%
+    \begin{tikzpicture}[overlay]
+      % first pagenumber
+      \node at ($(current page.north west)!.5!(current page.center)$)
+      [font=\fontsize{\wmfontscalepagenumber\paperwidth}{\wmfontscalepagenumber\paperwidth}]
+      {\bfseries\the\numexpr\thepage};
+      % then callsign if there is one
+      \IfEq{\callsignlen}{0}{}{
+        \node at (current page.center)
+        [rotate=\diagonalAngle, font=\fontsize{\wmfontscale\paperwidth}{\wmfontscale\paperwidth}]
+        {\bfseries\callsign};
+      }
+      %\draw[red,step=1mm] (0,0) grid (40,40);
+    \end{tikzpicture}
+  }
+}
+
+% Duplicate page: e. g. two a5 on one a4
+\usepackage{pgfmorepages}
+\pgfpagesuselayout{2 on 1}[\paper,landscape]
+
+\pagestyle{empty}
+\setlength\parindent{0pt}
+
+% calculate, how many lines fit on the paper
+\FPset\htext{\stripdim{\textheight}}
+\FPset\hlines{\stripdim{\rowheight}}
+\FPset\hru{\stripdim{\arrayrulewidth}}
+\FPeval\tablelines{trunc((htext/(hlines+hru)), 0)}
+\FPeval\tablelinesPlusTwo{round(tablelines + 2, 0)}
+\FPeval\tablelinesPlusFour{round(tablelines + 4, 0)}
+
+% add +OP on trainee sheet
+\IfStrEq{\trainee}{\detokenize{trainee}}{
+  \def\locationOp{Location+OP}
+}{
+  \def\locationOp{Location}
+}
+
+% add content of table, create #2 times #1/#2 rows, #1/#2 including two header rows
+\prgNewFunction \makerows{mm} {
+  \tlClear \lTmpaTl
+  \intZero \lTmpaInt
+  \intStepInline {1} {1} {#1} {
+    \boolSet \lTmpaBool {\intCompare {\intMathMod{##1-1}{#1 / #2}} = {0} && \intCompare{#1-##1} > {2}}
+    \boolVarIfTF \lTmpaBool {
+      \intZero \lTmpaInt
+      % heading
+      \tlPutRight \lTmpaTl {\SetVline[=]{##1}{0pt} \SetCell[r=1,c=5]{valign=m,c} \begin{tblr}{colsep=0pt,width=\textwidth,rows={\rowheight},colspec={X[l,m]Q[r,m]}}Date: \hspace*{4cm} \locationOp: & Mode: \hspace*{2cm} \end{tblr}&&&&& \SetVline[=]{##1}{0pt}\\}
+    }{
+      \intCompareTF {\intMathMod{##1-2}{\intEval{#1 / #2}}} = {0} {
+        % column descriptions
+        \tlPutRight \lTmpaTl {Time & Callsign & RST tx & RST rx & Frequency/Name/Location/Notes\\}
+      }{
+        \intIncr \lTmpaInt
+        % add empty rows with counter
+        \tlPutRight \lTmpaTl {\hphantom{12345678} & \hphantom{AAA0AAA/AAA0AAA} & & & \SetCell[r=1,c=1]{r} \color{LightGray}}
+        \tlPutRight \lTmpaTl {\intUse \lTmpaInt}
+        \tlPutRight \lTmpaTl {\\}
+      }
+    }
+  }
+  \prgReturn {\expValue{\lTmpaTl}}
+}
+
+
+\begin{document}
+\ttfamily
+\SetTblrInner{rowsep=0pt,rulesep=0pt}
+% two sides (front/back)
+\foreach \i in {1,2}
+{
+  % two pages (left/right)
+  \foreach \j in {1,2}
+  {
+    % watermark on every side
+    \wmpagenumber
+    \begin{center}
+      % fix centering
+      \addtolength{\leftskip} {-2cm}
+      \addtolength{\rightskip}{-2cm}
+
+      \begin{tblr}[evaluate=\makerows]{
+          rows={\rowheight},
+          width=\textwidth,
+          vline{1-Y}={},
+          hline{2-Z}={},
+          colspec={YYYYZ Q[colsep=0pt]}
+        }
+        \makerows{\tablelines}{\numtables}
+      \end{tblr}
+    \end{center}
+    \newpage
+  }
+}
+\end{document}
diff --git a/sample/logsheet.DL1XXXX.pdf b/sample/logsheet.DL1XXXX.pdf
new file mode 100644
index 0000000..ba166c8
Binary files /dev/null and b/sample/logsheet.DL1XXXX.pdf differ