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   KD7VKZ Tilt/Pan
   K6ZVA Trailer
   K6ZVA Flight-Tracker
   K6ZVA ATV Transmitter
   K6ZVA Cut-Down
   KD7VKZ Tracker
   Alt/Az -> HA/Dec
   Kenwood TH-D7
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Magic Valley Hams
It was great fun, but there has been no new balloon activity since 2006, and I don't expect anything new.

K6ZVA ATV Transmitter Package

Aug. 12, 2003

AMATEUR RADIO COMMUNICATIONS TRAILER

HF - VHF - UHF - TELEVISION

By Lee R. Kelly K6ZVA
   



This trailer is specially designed and build as a one man quick response communications unit. Although a RACES/ARES command center was of primary importance, all regular amateur radio modes and activities are accomodated. Up to three operators can be comfortably seated.
   



The highly organized equipment area and hidden cabling provide a safe and efficient operating environment. This arrangement also allows for quick operational training.
   



Basic living needs are met for extended periods including amicrowave oven, refrigerator, water storage, basin and porta-poti. A storage cabinet is available. Sleeping facilities would normally be within the towing vehicle.
   

Power Sources

Power Sources

All power supplied to the unit is processed in a steel cabinet installed against the forward bulkhead. The master switch located in this cabinet is key locked to prevent un-authorized use. A 125 Ah deep cycle battery is within the main 13.8 Vdc source. It is maintained from 117Vac external power with a 10 Amp automatic charger.
   



A 1000 Watt AC inverter provides power for several regulated DC supplies. This arrangement insures constant regulated power for the HR and ATV transcievers as well as AC lighting and electircal outlets suring full mobile operations. Fast switching occurs during loss of external power.
   



GENERAC 4500 Watt 117 VAC Generator. 12 Volt DC 15 Amps. Transported on board.
   

Communications Equipment

Communications Equipment

IBM 760EL - Laptop Computer.
Magellan MAP410 - GPS.
Rigblaster - PSK, SSTV, etc.
Kantronics KPC 3 Plus - TNC
Yaesu FT 847 - This unit allows for all ham modes. See specs.
   



23cm Tuner (for NCR 1300 Downconverter) 8 Amp regulate power supply for TC70-20
FRG 9600 Scanner.
PC Electronics TD 70-20 ATV Transceiver
Radio Shack HTX-252 2M Transciever
5 Inch Color ATV Video Monitor
Vidoe Source Selection Switch
   



Ambico Video Title Writer
20 A regulated power supply for FT-847
Radio Shack HTX-420 HT
Pelco - P/T Controller for Roof Cam
Roof Camera Power Switch, Mast rotator control.
HP 720C Printer
   



Microwave Oven
13 Inch Sansui ATV Monitor / Video Selector
Power Source Cabinet
   



Behind the removable cable covers.
   



Power Distribution Panel
   



Paralell Port Switch and 20 A power supply. Normaly hidden behind a false wall.
   

Roof Camera

Roof Camera

A Panasonic Color Camera is housed in a Cohu environmental tubular case. A Fujinon -TV-Z 1:1.8/16-160 10*16 lens with full control of zoom, focus and iris as well as the Pelco tilt and pan are opperated by the Pelco control unit inside. The Tilt/Pan is a Pelco 24CVAC ourdorr unit. The Panasonic camera was installed in place of the original BW camera. This high quality equipment was obtained sirplus from the Idaho National Energy and Eingineering Laboratory. (INEEL)
   



Interior transport of the camera and tilt/pan head.
   

Interior Camera

Interior Camera

For transmitting crew and inside operations shots, a Panasonic Color camera with wide angle lens is used. ALl video transmitted and processed by the Sansui TV can be recorded on it's internal VHS tape.
   

Video Source Selection

Video Source Selection

The Sansui AC/DC TV has all channels, baseband input and output on RCA jacks. All video is output this way. All are selected with the remote. When TV channels are selected, the Hat Cam is on Channel 10. The TC70-20 70cm output or the output of the 1253.125 MHz. downconverter are on channel 3.
   



When Line Input is selected on the Sansui TV, the Video Switch box selects (C1) the Roof Cam, (C2) Inside Cam or Camcorder cable. The video output is cabled to the Video Title Writer then thru the Snappy.jpg image capture device, (for SSTV) then to the audio and video inputs of the TC70-20.
   

Antennas

Antennas

The criteria for choosing the various antennas was the requirement that all must be stored neatly within an assigned interior space. Each was researched for optimal performance. For the FT-847, the 40M to 70cm ATS screwdriveer was selected. With the use of a diplexer, a more effective 2M, 70cm Diamond X50 is used. When 75M -80M operation is necessary, two Hustler resonator types are on standby. ALl entenna and camera jacks are located on the left or street side of the trailer roof. All are readily accessible from the fender step or included stepladder. The rotor operated telescoping mast collapses flush with the roof and when fully extended reaches to about 27 feet. Other antennas are 1/4 wave ground plane types for 2M - 70cm scanner and the 2M HTX 252 transciever. The Magellan GPS uses a roof mounted patchtype antenna. TV antennas are the 27 element 1253MHz Loop Yagi, and 7 element 70 cm Yagi.
   

Antenna Storage

Antenna Storage

   

The Trailer

The Trailer

When the first thought of constructing a communication unit with a definite budget in mind, an RV, Motor Home and a Trailer were considered. With both the original cost and maintenance as well as storage and size, the RV and Motor Home were ruled out. A local trailer manufacturer was chosen for a custom size and layout.
   



A limited garage door height set the clearance and a practical length for towing in small spaces set the dimensions. The vertical clearance is 93 inches. Width is 96 inches outside wheel to wheel. The interior is 6ft wide, 6ft high and 10ft long. The order stated the need for a side door, a rear door, a roof vent using the above dimensions. It is constructed using 1 inch square steel tubes in the cage. The interior is covered with painted 3/16 inch paneling. The 15 inch wheels and axels are on torsion bar suspension. Installed later was 1 inc styrofoam inside roof insulation. The interior cabin work was created from the purchase of a large Sauder cabinet. It was modified to provide all the necessary material for all finished surfaces.
   

Interior Special Features

Interior Special Features

   



Hiding the antenna cables.
   



Overall interior shot looking forward.
   



The cables hiding behind the equipment.
   

More Interior Shots

More Interior Shots

   



   



   



   

Some Exterior Shots

Some Exterior Shots

Air conditioner open.
   



Air conditioner closed.
   



   



   

A RACES Emergency Site

A RACES Emergency Site

   

Yes, I made it all by myself.

Yes, I made it all by myself.

Lee R. Kelly K6ZVA
Barbara G. Kelly KD7JKC

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