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    Archived pages: 67 . Archive date: 2013-07.

  • Title: WA4DSY.NET
    Descriptive info: .. Dale Heatherington's Ham Radio, Electronics and Robotics Web Site.. A proud member of the.. Reality-Based Community.. | Robots.. |.. Weather.. |.. Filter Design.. Robots.. Dales Homemade Robots.. Atlanta Hobby Robot Club.. Personal Stuff.. My Hayes Microcomputer Products photo album.. Pics from the late 70s.. Various schematics and source listings for early Hayes modem products that I designed.. Long time friend Tony Kings ham radio page.. w4zt.. com.. My HT-220 Synthesizer semi-kit from 1976.. History and info about the Motorola HT-220 radio.. A little history of WSTB radio at Southern Tech in 1967-69.. Photographic proof of Psychic Powers.. Photo of Leonids meteor trail (11-18-01).. Politically incorrect way to dispose of a computer!.. My hobby robot projects.. Honda Civic flys off road and destroys my wrought iron fence.. Our Cats.. Views from my tower video camera (not live).. Kids R Irradiated :-).. Japanese 911.. Nails for your coffin?.. Mystery of the Golden Door (plus links to skeptic sites).. Armageddon Again ? (Failed end of world predictions).. Help fight the 419 Nigerian Advanced Fee Fraud.. I test 3 Canon lenses at 24mm focal length on my  ...   Sage.. A site with many filter design tools.. L Matching Network Calculator.. Impedance Converter using L C.. Nederland Homemade Robots.. Microstrip Line Calculator.. Patch Antenna Calculator.. Misc Radio Electronics links.. The Gottingen Heart Antenna.. Gray-Hoverman UHF TV Antenna.. Bruce Carters loop antenna calculator.. Free space pathloss calculator.. WiFi 2.. 4 ghz.. circular waveguide antenna.. (with size calculator).. Wavelength/Frequency calculator.. Coax cable attenuation calculator (RG59,RG6,RG7,RG11).. C-Band Big Dish Analog 4DTV Satellite TV links.. 4DTV Online : C-Band 4DTV will still exist in limited form in 2011 on Sat X4/W5.. Lyngsat:.. Lists locations, frequencies and programming on most communications satellites.. Skyvison:.. Sells DVB and 4DTV receivers, accessories and programming.. 4DTV Satellite Forums:.. Ask questions, get answers.. Satellite Receivers LTD:.. Sells receivers and programming.. 4DTV Generic Satellite tables.. APRS Server Software etc.. Note: APRS server and RF gateway services have been discontinued as of March 1st 2009.. This is from South Africa Homemade Robots.. Get the latest version of aprsd, the Linux APRS Server.. World grid square map.. WA4DSY 56K Baud RF Modem.. Misc.. experimental services.. Dales Homemade Midi Ringtones (for your cell phone).. Current Weather conditions here..

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  • Title: Dale's Homemade Robots - Welcome to Dale's Homemade Robots
    Descriptive info: Skip to navigation.. Skip to content.. Dale s Homemade Robots.. Search.. :.. You are here:.. Home.. Navigation.. About Dale.. Contact.. Site Map.. Links.. Dragon*Con Robot Battles.. Combat Robotic Events Calendar.. More useful Links.. Mad Science.. Slow Motion Video.. Uphill Roller.. Flip-O-Matic.. Spinning Compass.. Gas Spring Flipper.. Golf Ball Floating in Air.. Hacks and Hints.. Dewalt Drill Motor.. Drill Motor Hack.. Hot Wire Plastic Bender.. Robot Projects.. Dead Air, a 16oz combat bot.. iRoll - Rideable Ball Balancer.. Polyathlon Robot.. Balancing Robots.. Overthruster 30# bot.. Cube Quest Robot - The Cubinator.. Scary-Go-Round.. Full Body Spinner.. OmegaForce 2.. 0.. Light Seeking Spinner.. Trisector Combat Robot.. Omega Force 1.. Thrasher.. Amdroid -A.. Invertabot.. T-Zero.. Suckmaster II Vacuum Robot.. Six Channel Sonar.. Delta Force Mini Sumo.. ROBOR Mini Sumo.. SuckMaster 2000 Vacuum.. Line Follower.. Robot Events.. Robot Battles 2012.. Robot Battles 2011.. Robot Battles 2010.. Robot Battles 2008.. Robot Battles 2007.. Robot Battles 2006.. Robot Battles 2005.. Robot Battles 2004.. Robot Battles 2003.. Robot Battles 2002.. Robot Battles 2001.. AABB2 2004 (Video).. Rocket City Robot Assault.. SEABC 2003.. The Capitol  ...   Welcome to Dale s Homemade Robots.. New Content.. Dead Air, a 16 oz combat bot.. 2012 Dragon*Con Robot Battles report.. Robot Battles 2012 Highlights Video.. 4/23/2012.. Added video of a new bot weapon to slow motion page.. 10/28/2011.. iRoll - A Segway-like human transport thing that balances on a bowling ball.. 7/14/2011.. Ball Balancer.. A radio control balancing robot.. 1/26/2011.. Added a 10GHZ microwave beacon tracker to the Polymax 9000 robot.. Video, photos and text here.. 12/14/2010.. This site has been moved from my Linux box on my home DSL line (512kb up-link) to a real web hosting company.. Your page loads should be a lot faster now.. 8/10/2010.. Hot wire plastic bender project.. 01/20/2010.. 12/20/09.. Double ended cone rolls uphill.. Hit Counter = 60146.. All site hit counters reset April 1 2012 due to software upgrade.. ^ Top.. Next page:.. A Brief Technical History of Dale.. © Copyright 2004-2013 - Dale A.. Heatherington.. This work is licensed under a.. Creative Commons Attribution-Share Alike 3.. 0 United States.. This site is powered by.. CMS Made Simple..

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  • Title: HT220 Frequency Synthesizer
    Descriptive info: HT220 Frequency Synthesizer.. originally published 1976.. by Dale Heatherington, WA4DSY.. edited for webpage use by Michael Wright, K6MFW.. edited for mistakes by Walter Dilley, KD7DNY.. , 6-28-02.. http://www.. geocities.. com/mikeht220/220synthesizer.. html.. Introduction.. The following instructions pertain to the new board marked with the number 051776.. There have been several improvements made over the old board.. Most noteable is the reduction of receiver birdies and a 12 mA reduction of the power drain.. Only 2 receiver birdies remain; 146.. 000 and 147.. 100 MHz.. The transmitter spurious outputs are at least 5 dB better and the broad band white noise is down much more.. The white noise reduction also resulted in improved receiver sensitivity.. I still don t recommend using a high power amplifier with the synthesized HT220 but if you feel the need to do so here is the formula to compute the 2 major spurs so you will at least know where your QRM is.. Upper spur =.. F + ((F/9) - 15.. 5555) for simplex.. 4888) for -600 KHz.. 6888) for +600 KHz.. Lower spur =.. F - ((F/9) - 15.. where F = operating frequency in MHz.. example:.. F = 146.. 520 MHz simplex.. lower spur = 145.. 796.. upper spur = 147.. 244.. Another major improvement was the elimination of the two CD4011 ICs.. Many people found it was hard to find CD4011s that would work right in the original circuit.. That is no longer a problem since there are no CD4011s in the new circuit.. Some people have ask why I used 9.. 10222 MHz for the reference frequency instead of 4.. 551111 MHz so the CD4020 reference divider would not be pushed to it s limit.. The answer is simple.. High accuracy crystals in the HC 18/U holder below 6 MHz are not available.. A word about IC sockets: You can use low profile sockets if you bend the leads that need to be soldered to the top side of the board out to the side so you can solder to them.. Be careful that they don t touch anything they should not.. Good Luck.. Dale.. Drawings.. These jpeg images were scanned at 72 dpi.. Print using your page setup or save and open with Photoshop.. Schematic.. (247K, size 17x22).. Parts Layout.. (293K, size 17x22).. Transmitter Interface.. (91K, size 12x10).. Receiver Interface.. (114K, size 10x14).. Power Supply Interface.. (118K, size 13x10.. 5).. Parts List.. Z1.. CD4059AE.. Programmable divider.. Z2.. CD4046AE.. Phase look loop.. Z3.. CD4020AE.. 14 stage divider.. Q1, Q2, Q3,.. Q4, Q9, Q10, Q11.. MPS3704 or 2N4401.. NPN transistor.. Q5, Q12.. MPS3703 or 2N4403.. PNP transistor.. Q6, Q7, Q8.. 40673.. RCA dual gate MOS-FET.. D1.. 1N759.. or any 12 volt 400mw zener diode.. D2.. MV2107 or MV2106.. Motorola EPICAP tuning diode (22pF at 4V).. D3, D4, D5.. 1N914 or 1N4148.. diode.. S1.. 76A10.. Grayhill 10 unit DIP switch.. R1, R3, R10.. R20, R35, R42.. 1000 ohm.. 1/4 watt 5% resistor.. R2.. 150 ohm.. R4, R12, R18,.. R19, R23, R24,.. R25, R26, R27,.. R28, R29, R30,.. R31, R32.. 100K ohm.. R5, R7, R18,.. R21, R36, R38.. 10K ohm.. R6, R14.. 15K ohm.. R8, R9.. 2.. 2K ohm.. R11.. 180K ohm.. R13.. 22K ohm.. R15.. 100 ohm.. R16, R17.. 220 ohm.. R22.. 820 ohm.. R33.. 7K ohm.. R34.. 220K ohm.. R37.. 3.. 3K ohm.. R39, R40.. 470K ohm.. R41.. 47K ohm.. C1-C7.. 5-25 pF trimmer.. Erie 518-000-5-25 or equivalent.. size: 0.. 220" dia.. x 0.. 170" high.. C8, C15, C27.. 10 uF at 20 VDC.. Sprague 183DR106X002D or equiv.. sub-miniature tantalum capacitor (radial leads).. C9, C16.. 0.. 01 uF at 100 VDC.. Disc ceramic capacitor (0.. 300" max dia.. ).. C10, C17, C21.. C24, C25, C29.. 100 pF.. C11, C22.. 330 pF.. C20, C33.. 10 pF.. C23.. 33 pF.. C30, C31, C32.. 22 pF.. C18, C28.. 001 uF.. C12, C19.. 1 uF at 35 VDC.. Sprague 182DR104D4035H or equiv.. Sub-miniature tantalum capacitor (radial leads).. C13, C14, C26.. 1 uF at 25 VDC.. Sprague 16D105X9025BC2 or equiv.. Sub-miniature tantalum capacitor (axial leads).. L1.. 7 uH.. 7 micro henry choke or.. 40 turns of #36 magnet wire.. wound on the body of a 1 meg ohm.. 1/2 watt carbon resistor.. X1.. 13.. 68888 MHz.. crystal.. X2.. 15.. 62222 MHz.. X3.. 55555 MHz.. X4.. 48888 MHz.. X5.. 9.. 10222 MHz.. Crystals are 0.. 002%, 20 pF load cap.. calibrated at room temp.. HC 18/U holder.. Order type HA-M1 from International Crystal Mfg Co.. icmfg.. com.. Specifications.. Frequency range: 146.. 000 to 147.. 995 MHz transmit and receive.. Channel spacing: 5 KHz.. VCO frequency.. Transmit 16.. 2222 - 16.. 4438 MHz.. Receive 14.. 3555 - 14.. 5772  ...   Adjust C5 for 9.. VCO and offset oscillator adjustments.. Connect the frequency counter lead to point H (xmit drive).. Connect the VTVM to the + side of C14 (1 uF).. Set S1 (freq.. select switch) to 147.. 000 MHz.. If the board is not in the radio, connect point F (ptt) to +15 volts.. This puts the synthesizer in transmit mode.. If the board is in the radio you must key the transmitter.. Connect a temporary jumder wire from point D to point B.. This puts the synthesizer in simplex mode.. Turn on the power and adjust C7 for a 5 volt reading on the VTVM.. If you get the 5 volt reading at this time all of the circuits are working ok.. Adjust C3 for 16.. 33333 MHz VCO frequency.. Remove the jumper from point B and connect it to point A.. This puts the synthesizer in +600 KHz mode.. Adjust C2 for a VCO frequency of 16.. 4000 MHz.. Remove the jumper from point A and connect it to point C.. This puts the synthesizer in -600 KHz mode.. Adjust C4 for a VCO frequency of 16.. 26666 MHz.. Remove the jumper from point F to +15.. Connect the jumper from point F to ground.. This puts the synthesizer in receive mode.. Adjust C6 for a 5 volt reading on the VTVM.. Adjust C1 for a VCO frequency of 14.. 4666 MHz.. Alignment is now complete and the synthesizer can now be installed in the radio.. Some of the trimmer capacitors may need to be touched up after it is in the radio.. Below is a list of the trimmers and their function.. C1 Receive frequency adjust.. C2 +600 KHz offset frequency adjust (transmit).. C3 Simplex frequency adjust (transmit).. C4 -600 KHz frequency adjust (transmit).. C5 Reference oscillator frequency adjust.. C6 VCO range adjust (receive).. C7 VCO range adjust (transmit).. NOTE: If you have trouble with any of the test and alignment steps cheek for a 555.. 555 Hz square wave at pin 3 on Z3, CD4020.. Some 4020s won t work at 9.. 1022 MHz.. If you have an input on pin 10 of this IC but no output on pin 3 you need to try another one.. How to use the binary frequency select switch.. This switch consist of 10 spst switches numbered 1 thru 10.. In the following discussion an "ON" switch will be called 1 and an "OFF" switch will be called 0.. The frequency is entered directly in BCD code.. Switch #1 is the MHz select switch.. 0 = 146.. XXX MHz, 1 = 147.. XXX MHz.. Switches #2, 3, 4, 5 are the 100 KHz select switches.. They are BCD coded and can select any digit from 0 to 9.. Switches #6, 7, 8, 9 are the 10 KHz select switches.. They are also BCD coded and can select any digit from 0 to 9.. Switch #10 is the 5 KHz select switch.. 0 = 14X.. XX0, 1 = 14X.. XX5.. Note: The following is in courier font so the numbers should align in proper columns.. BCD code for switches 2 thru 9.. BCD code, 0 = off, 1 = on.. Switch number.. 2 3 4 5 or.. 6 7 8 9.. -------.. 0 0 0 0 = 0.. 0 0 0 1 = 1.. 0 0 1 0 = 2.. 0 0 1 1 = 3.. 0 1 0 0 = 4.. 0 1 0 1 = 5.. 0 1 1 0 = 6.. 0 1 1 1 = 7.. 1 0 0 0 = 8.. 1 0 0 1 = 9.. 8 4 2 1 = binary weight.. Examples:.. MHz 100 KHz 10 KHz 5 KHz.. 1 2 3 4 5 6 7 8 9 10 switch number.. 0 0 0 0 0 0 0 0 0 0 = 146.. 000.. 0 0 1 0 1 0 0 1 0 0 = 146.. 520.. 0 1 0 0 1 0 1 0 0 0 = 146.. 940.. 0 1 0 0 0 0 0 1 0 0 = 146.. 820.. 1 0 0 0 0 0 0 0 0 0 = 147.. 1 0 1 1 1 0 0 1 1 1 = 147.. 735.. Caution, when operating above 147.. 400 MHz be sure the transmit offset switch is in simplex or -600 KHz.. If not the transmitter will transmit at 148 MHz or above.. Photo of DIP switch in back of a HT220 (image from an eBay item).. Feedback is desired (suggestions, comments, errors, gripes, whatever) Michael Wright, K6MFW,.. Go the HT220 Page at http://www.. batnet.. com/mfwright/HT220.. html..

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  • Title: WSTB Radio Southern Tech 1968-69
    Descriptive info: WSTB AM 1280.. Southern Tech.. 1969.. Left to right: Al LaFavor, Larry Small, David Weathington, Dale Heatherington, Bill Meecham.. WSTB memories.. by Dale Heatherington.. When I came to Southern Tech in fall of 1967, WSTB had been on the air about a year serving dorm 1 ( Norton) and dorm 2 (Howell) with top 40 music played by student DJs.. It was very low power and unlicensed.. The signal emanated from homemade AM transmitters in janitors closets on the top floor of the dorms.. They fed tuned loop antennas strung around the roofs which concentrated the RF and limited coverage to only the dorms.. During this time engineer George Vaughn rebuilt the system with one transmitter on 640KHZ.. The transmitter was located in dorm 1.. There was coax taped to army field telephone cable hung in the air between the two dorms.. Audio from the studio came into the janitors closet on a leased telephone line.. In the studio, located in room 273 on the second floor of the classroom building, was a couple of turntables, a tape deck and a homemade passive 6 channel mixer board.. During the fall quarter of 1967 I built a tube based (12AT7) mixer amp to improve the performance of the existing passive mixer board.. This was done to boost the output and stop interaction between channels.. WSTB sometimes suffered interference from distant AM stations on 640KHZ so it was decided to move to a frequency with much less interference.. Fellow engineer George Vaughn and I built a new and much better transmitter on 1280 khz and re-tuned the loops.. The 1280 transmitter was much more stable and had very clean audio compared to the old one.. I used a pair of crystals in the 7 MHZ range exactly 1280 KHZ apart and mixed them together to create the 1280 KHZ carrier.. Since they drifted with temperature exactly the same the carrier was very stable.. Due to time and budget constraints, I chose the two crystals from a bin at J.. B.. Kramers bargain basement of surplus goodies instead of ordering a custom crystal.. The transmitter performed very well, sounded great and at 1280 KHZ never suffered from interference.. Inspired by a trip to WREK-FM at GA Tech and a look at the schematic of their Gates Sta-Level, I built a pretty good automatic level control for WSTB in the spring of 1969.. Like the  ...   so spectators could listen on portable radios.. To do that we'd have to go pirate! I opened the loop antennas so they operated more like dipoles and actually radiated like a real AM radio station.. It worked great and the FCC did not notice.. There was a drive-in theater next to the campus and the screen was clearly visible from Dorm 1.. Several individuals who shall remain anonymous built a tiny 35 mhz transmitter and installed it in one of the drive-in speakers.. It had a photo cell to keep from draining the battery during the day.. A receiver on Dorm 2 captured the movie audio and distributed it to the SPONGE line.. One night the audio was broadcast on WSTB.. This was a big hit with the occupants of dorm1 but not so much with the administration who quickly put an end to our fun.. Below are some WSTB photos and audio clips mostly from 1969.. Enjoy.. Station IDs and promos.. Station IDs.. Brenton Wood does a WSTB promo.. DJ recrutement spot.. Attention new students #1.. Attention new students #2.. Fall '69 promo #1.. Fall '69 promo #2.. Hell Fire.. "Drag" promo.. Susan Rakestraw.. Cheerleader.. Valentine Dance.. DJ Sample clips.. Glenn Meadows.. Bill Meecham #1.. Bill Meecham #2.. Bill Meecham #3.. Bill Meecham (weather on 2-13-1969).. Brian Carling #1.. Brian Carling #2.. Brian Carling #3.. Brian Carling #4.. Unknown DJ #1.. Texas Ranger #1.. Texas Ranger #2.. Texas Ranger #3 Free Cokes.. Texas Ranger #4.. Willie Moore.. George Vaughn #1.. George Vaughn #2.. George Vaughn #3.. Crazy Jimmy Price.. Price makes a joke about Heatherington's IQ on the air.. Heatherington then pranks Price by sending delayed WSTB audio back to him causing incoherent speech.. The Papa True Love incident.. The last words of "Papa True Love".. WSTB management switches the the transmitter.. audio source from the WSTB studio to the SPONGE.. line to preempt Papa True Love.. (Listen for the dial pulses).. Oscar preempts Papa True Love by broadcasting.. live from Room 120 in the Norton Dorm via the SPONGE Line.. Al LaFavor paints the rock.. Clips from the spring '69 Bath Tub Race.. Tub race promo (Meadows).. DJ Oscar before race.. ASTME tub time trial.. More time trial reports.. Race start reported by McLendon.. Race progress reports.. More race progress reports.. WSTB reporter Al LaFavor at the tub race.. This page built by 1968-69 WSTB engineer Dale A.. Heatherington..

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  • Title:
    Descriptive info: Photographic proof of the existence of Psychic Powers.. Not only does she exist, we also know her address and phone number..

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  • Title: Leonids Meteor 18-NOV-2001
    Descriptive info: Leonids Meteor 18-NOV-2001.. Leonids Meteor Trail 18-NOV-2001.. This meteor trail photo was taken on November 18th, 2001 with a Leica M6 camera mounted on a motorized telescope tripod.. The lens was a Leica 35mm/f1.. 4 set wide open.. The exposure was made on Fuji Superia 800 film for 3 minutes.. The image has been manipulated in gimp to greatly increase contrast and crop about 75% of the unwanted area in the frame.. The stars do not show trails due the motorized tracking telescope mount.. The camera was aimed high towards the northeast and located at my home 5 miles northwest of Roswell GA.. About  ...   and covered it with a plastic trash bag.. When I came out at 4:30 AM and removed the trash bag I discovered the camera was wet with dew! There was even moisture inside the lens.. I spent 15 minutes inside with a heat gun and compressed air drying the camera.. To prevent condensation from reforming I used a heat gun to blow hot air over the camera while taking the pictures.. There was significant light pollution at my observing site.. I should have used shorter exposures.. If had it to do over I'd use 1 minute exposures instead of 3.. Back to Home Page..

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  • Title: Obsolete Computer Disposal
    Descriptive info: Obsolete Computer Disposal.. May 2000.. Uh Oh.. 7 years later the great drought of 2007 exposes the corpse..

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  • Title: Dale's Homemade Robots - Welcome to Dale's Homemade Robots
    Original link path: /robot/index.php
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  • Title:
    Descriptive info: Sunday, June 25 2000, 12:55 PM.. Speeding Honda Civic destroys wrought iron and brick fence!.. In the photo above and below we see where the Honda Civic came to rest after leaving King road at the location of the police car behind the fireman.. The 20 year old driver appeared to have only minor injuries.. The driver says the car flipped over once before landing on my fence.. He was lucky that all the gas that leaked out didn't catch fire because he.. destroyed the fire hydrant.. as  ...   Honda.. The brick column didn't do any better.. Here is a close-up of the Hondas' rear end.. I'm pleased that this particular act of stupidity was punished swiftly and severely.. Use your scroll bar to pan across the scene.. See if you can determine why the driver suddenly took a 45 degree right turn 6 feet this side of my brick mail box (where the police car is parked).. We have no idea.. There were no other cars involved.. The driver claims he ran off the road then over-corrected..

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  • Title:
    Descriptive info: The WA4DSY Kitty Cats.. Ralph Ed.. Nov.. 3rd 2010.. This is Ralph the cat on Nov 3, 2010 several hours after bringing him and Ed home from the.. Good Mews cat shelter.. He's 13 pounds and solid gray.. We think he's about 1 year, 9 months old.. His bother Ed is virtually identical but weighs a pound less.. They are both very sweet lap cats that love to be petted.. They also enjoy chasing ping pong balls and stealing  ...   Dec 1995.. Where's that mouse !?.. Age 1.. 5 yrs.. Meg-a-Byte and ceramic friend 9/9/2004.. Meg-a-Bytes Christmas picture 12/23/2004.. Breed:.. Maine Coon Cat.. DOB: Sept 27 1995.. Weight: 9.. 5 pounds.. Rodent kills: Averages about 2 per week!.. Lizard kills: a dozen or so.. Meg-a-Byte the cat used up the last of life #9 on Oct 21st, 2010.. She was 15 years old and in poor health.. Bonnie the Cat, 1984-2002.. Breed: Siamese/Himalayan.. March 30, 1984 - May 9, 2002..

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  • Title: WA4DSY Tower Cam
    Descriptive info: WA4DSY Tower Cam.. Views From the 190 foot tower.. These two shots are from a video camera 180 feet up my 190 foot tower.. Me at 160 feet!.. I installed a new HD tower camera in May 2013.. The scene looking west towards Sweat Mountain has changed a lot in 15 years!..

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    Archived pages: 67