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- History of YAGIMAX Versions:
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- 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.
- 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 availble 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.
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