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1991-09-27
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History of YAGIMAX Versions:
───────────────────────────────────────────────────────────────────────
1.00 (2/15/90) Started designing new and faster math code to replace YAGINEC.
1.01 (2/27/90) First version with a few bugs. Only released to two people.
1.02 (3/3/90) This version corrected a few minor bugs and added a bypass
feature for VSWR frequencies.
1.03 (3/8/90) This is basically the same as 1.02 but with the VGA capability
added.
1.04 (3/20/90) made a couple of minor corrections and added a moving cursor
for the VSWR frequency plot. Only a few disks released of this version.
1.05 (3/22/90) This version allows graphically viewing the physical antenna
and added EGA to the VGA capability.
1.06 (3/28/90) This version added Gain, F/B/ and VSWR linear plots which
provides a more conventional type of display.
1.07 (3/31/90) This version corrected a math error which I found after
being prompted by correspondence from W5PAQ. Results from this
version of YAGIMAX will differ slightly from previous versions by
about 0.3 percent. Sorry about that!
2.01 (4/2/90) This new generation has the added feature of polar
plotting of the E-plane antenna pattern. In EGA and VGA all
screen text is in the 43 line mode.
2.02 (4/5/90) Adds H-plane plotting capability in both free space and
above perfect ground.
2.03 (4/9/90) At suggestion of W5PAQ: When calculating Gain, F/B, and
impedance, a hard copy is now allowed when shortcutting the process
by using <ESC>. No graph of these data is allowed unless the
routine is allowed to proceed the full page, however.
2.04 (4/15/90) This version adds linear pattern plotting per request of
K2GAL and others. (only 2 copies released)
2.05 (4/17/90) At the request of K2GAL the capability for plotting free
space stacked antennas has been added. This version also has a
slightly modified algorithm to allow YAGINEC and YAGIMAX to track
more closely. Runs made with this version will have slightly
different results from older versions.
2.06 (4/21/90) (1)This version corrects a small error in the maximizing
routine which occurs when the dimension must be lengthened rather
than shortened. This was a result of transporting the routine from
YAGINEC 7.01 and omitting one step. (2) The angle steps are doubled
when the antenna has over 20 elements or is over 5 W/L above ground.
The math code was made "tighter" in this version which speeds up the
calculations, particularly when the antenna is stacked, or over
ground. (only 2 released)
2.07 (4/25/90) After more discussions with K2GAL, the stacking algorythm
was modified to multiply the pattern of a single Yagi by the
array factor of isotropic point sources. The results obtained by
this are different that those of 2.05/2.06 which multiplied the
current contributions (both real and imaginary) by the array factor
and then summed them to derive gain. Which is more accurate in the
real world? Take your pick! (only sent to K2GAL)
2.08 (5/2/90) Version 2.07 still not correct per discussions with K2GAL.
Found problem with free space stacking algorithm and I think that
this version may be the correct one. Also this version provides
E-plane stacking in free space.
2.09 (5/14/90) HOORAY!! Finally corrected the stacking algorithm which
was plagueing previous versions thanks to Hank Kasper, K2GAL, who
took the time and effort to manually grind out the numbers and
send them to me. I think we finally have it correct. Thanks Hank.
The EGA/VGA modes are now in the 80 by 43/50 text mode which may
help some of the EGA/VGA users. The number of Yagi elements has
been extended to 38/45 for EGA/VGA. A small mod was also made to
default the value of the frequency increment step per request
of W5PAQ.
2.10 (5/23/90) This version is the same as 2.09 except for the scale
change feature when using linear plotting.(K2GAL)
2.11 (5/31/90) Lawson's radius scaling algorithm is incorporated to
provide a more accurate means of changing frequencies for a
design. (W5PAQ) In addition, Pressing <Z> when using linear
plotting toggles a -13 dB line.(K2GAL)
2.12 (6/2/90) Corrected a problem which only can occur when using
the MAXIMIZING feature. When the VSWR at one of the adjacent
frequencies goes above 100:1, an illegal function call may occur.
(The program attempts to take square root of a negative number).
I inadvertently discovered this when optimizing a design where
the first and second directors actually came to a crossover
spacing! Not usually encountered in practice.
2.13 (6/6/90) Adds dimensions to VIEW feature. (10 el or less)
2.14 (7/5/90) Corrects (hopefully) a problem some EGA users have
encountered is graphics displays. This version is same as
2.13 except for this EGA mod.
2.15 (7/26/90) This version is virtually identical to 2.14 except
the user can select whether YAGIMAX is normalized more closely
to the results obtained with NEC-2 code, or closer to MININEC
code as was done with previous versions from 2.05 on. (K2GAL)
A glitch when saving to a directory where no .INP files exist is
corrected.(W5PAQ)
2.16 (8/18/90) This version has been normalized to match NEC2 results
and compensate for large diameter elements. (K2GAL & LU8EBH)
2.17 (9/8/90) Further refined NEC2 normalizing to a second order
correction. It now tracks within +/- 0.5% of NEC2.(K2GAL)
2.18 (10/8/90) Fixed minor problem when plotting a design which
exhibits a split front lobe.(K2GAL)
2.19 (11/15/90) Identical to 2.18 except provides the option of
keeping the same element spacing when performing a design
scale to a new frequency.
2.20 (11/22/90) The center of gravity arrow in the VIEW plot now
provides the dimension from the reflector end of the boom.
When entering dimensions by keyboard in NEW DESIGN, the
Escape <ESC> key reverts back to the beginning menu as long
as any dimensions (except reflector position) remain zero.
When entering POLAR plot, "E-Plane" and "1" antenna are
defaulted by hitting <ENTER>.
2.21 (1/1/91) This version allows EGA/VGA COLOR users to select
graphics in black and white, or color, from within the program.
This provides the user the ability to view the plot in color
while allowing him/her the option to make a hard copy from
b & w without exiting the program and rebooting. (TNX N7OCN)
2.22 (2/10/91) This version is virtually the same as 2.21 except
to prompt the user after a maximize run to see if he wishes to
replace the old dimension with the new maximized dimension.
Versions up to 2.22 were all compiled using Microsoft
QuickBASIC 4.5. Version 2.22 was compiled using Microsoft
Basic Professional Development System 7.0 which results in
a more compact program which runs approximately 60% faster
than the previous versions.
─────────────────────────────New Version───────────────────────────────
3.01 (3/1/91) This version is completely changed in style and
format. It features a topline menu which is <ALT> key and
mouse driven. Help screens are available and "hot" function
keys are available for various functions. The algorithms
and mathematical calculations remain the same as versions
2.17 to 2.22. YAGIMAX is now one year old and was in need
of a facelift.
3.02 (4/30/91) Added monitor self determination feature to
eliminate the need to query the user as to what type of
monitor was is use. (CGA/EGA/VGA)
3.03 (5/17/91) Fixed an editing bug incurred upon hitting <ENTER>
too many times. Created an keyboard subroutine to save
program space. No mouse cursor after printing results is
fixed.
3.04 (5/21/91) When performing Design Scale, or editing any
dimension, the program now inhibits previous results such
as print, Smith charts, and Display Results until another
Gain, F/B, and Impedance run is performed with the new
dimensions.
3.05 (6/5/91) Corrected a scrolling off the screen problem when
maximizing exceeds 20 steps. Tightened up the maximization
tolerance for less granuality. Fixed a bug which shows up
occasionally when too many steps are made during maximizing.
Fixed maximizing problem with a 2 element design as a
director/driven element.
3.06 (7/2/91) As per correspondence with LU8EBH the maximizing
feature remains in "maximize" and utilizes the same frequencies
unless recycled through the top line menu. Also the VSWR center
frequency can be changed without repeating the entire set of
frequencies. Linear plots of the H-plane over perfect
ground are now on the right side of the plot with positive
elevation angles!
3.07 (7/19/91) Provides double clicking of mouse for file selection.
Flicker reduction routine added when switching between text
and graphics modes.
3.08 (7/30/91) Adds a 3 dimensional plotting capability to the
graphics options for EGA/VGA users. Speeded up the graphics
algorithm somewhat. (Only given to W9GCW)
3.09 (8/1/91) Fixed bug when maximizing after making a plot. Corrected
the <ESC> key when maximizing. Changed order of 3-D plotting for
clarity. Fixed a bug discovered when first plotting a H-plane
over perfect ground then next running Gain, F/B, and VSWR vs.
frequency which produced negative gain and zero F/B. Probably has
been there from the first! The left/right keys will toggle the
menu boxes similiar to the tab key. The <ALT> key will exit the
dimensions screen in addition to the <ESC> key.
3.10 (8/7/91) Added "Save Results" to Options menu to allow the Gain,
F/B, and Impedance results to be saved to disk file for future
reference.
3.11 (9/26/91) The ability to add or subtract to the number of elements
with an existing design has been added per my visit with Georges,
F1BBI, in Paris in early September.
───────────────────────────────────────────────────────────────────────