Last updated- 5
September 2008 |
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These DOS programmes are freeware for Radio Amateurs only.
They have been tried with windoze, up to and including winxp, and found to be
OK (but probably won’t work with vista ). All programmes require a VGA
monitor and DOS 4.0 or later. Some of the programmes also need a maths
co-processor that generally means you will need a 486 or better PC. General Instructions if selected program does
not open in full screen |
Click on link below to download
program --
\!/
Resistor Colour Codes |
RESISTOR.EXE is a programme
that encodes a resistance into a colour code |
Co-ax Loss and VSWR Calculator |
ANT-VSWR.EXE computes the matched loss and total loss in a length of coaxial cable for an input frequency and VSWR entered by the user. VSWR at the far end of the cable is calculated, plus VSWR for an open or short circuit termination. Cable wavelength is also calculated. Data for 24 different coaxial cables are included. Other functions calculate stubs, 90 degrees Q lines and cable Zo. Needs a maths co-processor. |
COLOURS |
COLOURS.ZIP contains two small demonstration programmes that show how colours may be changed on the PC with a VGA card. COLOURS.EXE runs in DOS text mode and COLOUR-G.EXE runs in graphics mode. The Help/info page contains assembler code from the programmes that change the colours. You can select from many thousands of colours in both text and graphics modes, but generally you can only have 16 different colours on the screen at the one time. |
DB Conversion Aid V7.0 |
This programme does a number of different conversions and calculations where one of the terms is expressed in decibels, or a unit incorporating a dB. Conversions include power/voltage ratios, power to dBm/dBW, noise figure/Kelvins VSWR/return loss/mismatch loss. |
Folded Dipole Calculator V3.0 FOLDED4.ZIP |
FOLD-DP.EXE is a programme for calculating the feed
resistance of a folded dipole given element spacing and element diameters, or
the spacing for a given feed resistance and element diameters. |
Gamma
Match Calculator V2.0 |
GAMMA2.EXE is a programme for calculating gamma arm length and the required series capacitance for matching the impedance of an antenna to a co-axial transmission line. |
Helical Antenna Calculator V1.1 |
HELIX.EXE is a design programme for axial mode helical antennas. It calculates dimensions and gain of a helical antenna for a given frequency and number of turns, according to three sets of equations or formulas. The formulas are from J D Kraus, D T Emerson, and H E King/J L Wong. Three graphics screens show a typical gain/frequency curve, a polar pattern plot, and a drawing of the antenna with dimensions. |
Convert
Radix of an Integer |
RADIX.EXE is a programme for
converting between base 10 and base 16 numbers. It does not use floating point numbers, or need a maths co-processor. |
Helical |
HELIXRES.EXE calculates the dimensions and other parameters of helical |
Easter Sunday Calculator |
EASTER.EXE calculates the date of Easter Sunday using the
same algorithm as |
Dish Antennas Dual Mode Feed Horn Design |
DISHANT.EXE is a design programme
for dish antennas and W2IMU dual mode |
Noise Figure |
EMEPATH.EXE is a three part programme that calculates
signal to noise ratio (SNR) for EME |
Skin Depth |
SKINDEEP.EXE is a programme for calculating the skin depth
of an AC current |
Puff 2.3 Size - 99 KB |
PUFF23 is
my version of the PUFF 2.0 circuit analysis programme. It uses
the standard VGA 8x16 character set instead of the non-standard 8x14 EGA
character set that PUFF
2.0 uses. As a result it does not need a TSR to run and should work on any PC
that uses
a VGA type screen. PUFF23 fixes a great many of the
problems/bugs of PUFF 2.0, 43 at last count, and has some useful
additions to make it more user friendly. These include a directory list/file
load function, online help with basic driving instructions, and the ability to edit an extra eight board parameters from the
keyboard. PUFF23.ZIP contains the executable
and setup files plus a small readme file. PUFF23_B.ZIP contains
.puf circuit files, device files, printer files and a larger readme file,
listing most of the bug fixes and
changes. |
S-Z-Y |
SZY-VSWR.EXE
is a simple programme that uses the arithmetic of complex numbers to
convert between S(cattering) parameters admittance and impedance, and to
find the VSWR. You can find a few programmes that can
do this conversion, but in this one you may
specify the system Zo with both resistance and reactance for the VSWR
calculation. |