Science projects for the electronics hobbyist, including Tesla coils and power supplies, high voltage engineering, neons, power supplies, and transformers.
ATV Antennas in Amateur Rockets and Balloons - App Note. Rockets, Balloons or transmitting from any type of vehicle over head presents unique antenna problems for getting the best picture over the farthest distance on the horizon or at the launch site below. The type and placing of antennas in the vehicle and on the ground are discussed. Construction of a Turnstyle circular polarized antenna for launch site reception is described as well as making a reflector for the popular Olde Antenna Lab Wheel horizontal omni antenna. We suggest our TXA5- RC series 1. Watt transmitter board or Videolynx VM7. X transmitter module for most rocket and balloon applications. See WC6. P's video from a 7. Check out KD7. JVF's video from his rocket glider. Homebrew Antennas - low cost and easy to make. The Quagi antenna by Wayne N6. ![]() NB is made from 1. TW house wire and wooden boom - 8 and 1. ATV. Another cheap and easy beam to build is by Kent WA5. VJB. It is not as broad banded as the Quagi but fine if you prune it for your specific ATV frequency. Many bands and element lengths are shown. A simple omni directional vertical antenna for demo's, R/C receive, etc., is the ground plane antenna made with just a connector and some wire. AM ATV LINEAR AMPLIFIER SETUP - App Note. The blanking pedestal in the ATV transmitters video modulator must be set to restore the video to sync ratio in Amateur linear amps to compensate for the gain compression which occurs typically between 1/2 to full rated peak envelope power rating of the amp. This app note gives you the procedure, why's and where fores. Average reading vs. Peak Envelope Power (PEP) RF meter readings are discussed. You can download more specific information on the 7. Mirage D1. 01. 0 / D1. D2. 6N, RF Concepts/Kantronics RFC4- 1. Teletec DXP- U1. 50 Amplifiers which describes the ATV version of these 7. Watt amps, and what is done to make them ATV compatible. You can also down load our notes on driving the Downeast Microwave 7. PA 3. 5 Watt 7. 0cm, 7. PA 2. 25 Watt 7. 0cm and 2. PA 3. 0 Watt 2. 3cm amplifiers, also our PA5 board using the RA3. H4. 04. 7M RF power module for 2. W on 7. 0cm. Packaging the Videolynx VM- 7. X 5. Watt transmitter module - App Note. The Videolynx VM- 7. X is a compact transmitter module that accepts line level audio and video, 1. Vdc and has adjustable RF output from 0 to 5 Watts on 4 digiswitch selectalbe frequencies - 4. MHz. This app note describes adding a computer fan for R/C, robot, rocket or balloon applications and also for home or portable use, packaging the VM- 7. X along with the TR- 1b T/R relay boards in a Hammond 1. D (7. 4x. 4. 7x. 2. Estimated cost of all parts is about $3. App Note parts list on page 3. ATV Repeater System Design - App Note. A must read before you start building an ATV Repeater including sample priced out parts list and sources depending whether you want to go inband or crossband, which band or bands you want to use, single broadband or multiband or 2 antennas, horizontal or vertical, etc. Inband ATV repeater example and parts list. Crossband ATV repeater example and parts list. Compare the attenuation curves of using an 8 pole or 1. VSB Filter especially on a 4. MHz repeater output. To figure the ATV repeater coverage area, click on ATV DX which is on our home page. Video Operated Relay - App Note The VOR- 3 board has many uses - simple ATV repeater controller, beacon timer, 1. ID timer, video squelch, link vs. Channel 3 TV receiver module modifications for ATV. App Note. The Rch. MCM Electronics Model 3. TVC- 4. S. Great for seeing ATV on a camcorder monitor or DVD player screen when mobile or portable. The unit comes with a wall plug power supply for AC operation but this app note shows how to modify the receiver 1. Vac input for 1. 2 to 1. S- meter. Antenna Mounting ATV Downconverters - App Note How to repackage a downconverter and the pluses and minuses of doing so vs. DX. For antenna mounted preamps you can make a bias T to power up the coax. Variable Tuning the TVC- x. S Downconverters - App Note This app note describes how to add variable tuning to the synthesized TVCX- x. S series of ATV downconverter boards used in our TVC- 4. S, 9. S and 1. 2S downconverters to enable tuning non- standard ATV frequencies in the band or fine tuning for sync bars in the noise when looking for DX. Gunnplexer ATV - App Note. Hz Gunnplexer ATV transmitting system construction using the GVM- 1 video modulator board. Wideband FM video modulation is used along with 6. MHz sound so that C band satellite TV receivers can be used along with a LNB made for 1. GHz. Gunnplexers are available from SHF Microwave and Advanced Receiver Research. Choose those that have varicap tuning diodes in them - the modulator connects to the varicap to FM modulate the Gunn diode in the Gunnplexer. Band Planning - App Note 4. MHz LVSB technical considerations when FM voice repeaters expand below 4. MHz and coming up with an all mode local 7. Lots of good information for frequency coordinators, repeater owners and any mode experiencing interference in the 7. Basically there is plenty of room in the 4. MHz band for FM voice repeaters and links, 2 ATV channels, weak signal, satellite and digital modes if a technical band plan is devised and agreed to by the areas hams. AM ATV DSB vs. VSB - App Note. Describes the characteristics of transmitting AM video with double sidebands and vestigial sidebands, difficulty of maintaining VSB when driving amateur amps, and interference potential to other mode users. ATV Emission Characteristics - App Note. A bunch of technical stuff including ATV emission bandwidth, channel spacing, sharing with other modes, and more. FM ATV - App Note Discusses differences between AM and FM transmission of ATV: DX, common frequencies, resolution, pre- emphasis / de- emphasis networks, etc. The ARRL 2. 3cm bandplan does not have FM ATV. Here is a modified 2. FM ATV. Got an old transmitter or downconverter that you think the crystal went bad? Before you order a new rock, check out these trouble shooting tips. Also see our list of surplus crystals for $5. Ten pin VHS camera connector pin outs and connector source. DC power connector pinouts and source for P. C. Electronics transceivers and transmitters. Lamp replacement sources for P. C. Electronics Transceiver and Downconverters. Manuals and Data Sheets on P. C. Electronics manufactured products are available by email request free only to licensed hams upon email request - include your call letters - model number with revision letter or year as etched on the board. Please request only 1 or 2 at a time. ARRL Radio Amateurs Handbook The best discussion of ATV starts in chapter 9,1. Image Communications section of the CD that comes with the 2. This is the Radio Amateurs bible for all the many facets of the hobby. The ARRL Operating Manual also has a good section on Image Communications including ATV. The ARRL Repeater Directory has a section on ATV repeaters - see if there is one in your area. You can order copies by going to the. ARRL web site. Amateur Television Quarterly Magazine (ATVQ) is another good source of ATV info. Subscriptions are $2. Ham Nation is a weekly internet show with many different amateur radio topics including ATV - see episode 1. Southern California ATV Repeater Map (updated February 2. In southern California, we suggest first getting a downconverter and antenna for the repeater ham band you are line of sight to and then seeing if you want to transmit later. You can talk back to the ATV transmitting stations on 1. Hz) FM voice simplex. Em. Comm and public service groups use 4. MHz ATV simplex. The So. Calif. Microwave Experimentors net is on Monday nights 7: 3. PM utilizing a 1. Hz to 3. 3 g. Hz ATV repeater system on two mountain tops - Santiago and Heaps Peak with tower cam ID's. Also there is info on R/C and Rocket ATV. The San Bernardino Microwave Society (SBMS) meetings are televised by W6. KVC on the 1st Thursdays of the month starting at 7pm and can be seen on most So. Calif. ATV repeaters. The ATN Amateur Television Network Net is on Tuesdays 7: 3. PM. ATN has linked repeaters between the Los Angeles/ Orange/ San Bernardino/ Riverside County areas to Las Vegas, Santa Barbara and San Diego with the hub on Santiago Peak. Use 1. 00. 0 Hz CTCSS on 1. Santiago Peak ATV repeater sound subcarrier output. W6. ATV Rpt live stream. Santa Barbara CA. WB9. KMO, ATV special interest group of the Santa Barbara Amateur Radio Club. Mt. Diablo ARC - W6. CX San Francisco Bay and Sacramento CA area.
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