PC Electronics TX70-5s User Manual

70 cm atv transmitter

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TX70-5s 70 CM ATV TRANSMITTER

The TX70-5s transmitter is designed to provide >4Watts peak envelope power (sync tip) of video

modulated RF in the 70 CM (420-450 MHz) amateur band on any of 4 switch selected frequencies -

439.25, 434.0, 427.25 and 426.25 MHz - with a duty cycle of 15 minutes on and 5 off. Longer key down

periods can be done at reduced power or by blowing air on the enclosure.

Any licensed Technician class or higher Radio Amateur may operate this transmitter in accordance

with 47 CFR part 97 of the FCC Rules and Regulations.

The TX70-5s accepts U.S.A. standard composite video (1 volt pk-pk) from any source such as

color or black and white cameras with video output or camcorders, VCR's, or DVR's for transmission.

Audio from these sources or a low impedance dynamic mic is also transmitted on the 4.5 MHz sound

subcarrier. Transmit / receive power and antenna switching is provided for a companion high sensitivitty

TVC-4s downconverter. A cable ready TV may also be used to receive: 439.25 MHz equals cable

channel 60, 434 can be received on cable channel 59, and 427.25 or 426.25 received on cable channel

58.

PLEASE read through this manual before plugging in an cables and attempting operation. Each

connector and control is described here to enable your proper hookup and operation. Also the unique

video practices associated with ATV and the 70 CM band are described. More information on ATV can

be found on our Application Notes web page at www.hamtv.com.

P. C. Electronics 2522 Paxson Lane Arcadia CA 91007-8537 USA

1-626-447-4565

Tel:

Web site: http://www.hamtv.com

USERS MANUAL

m-th 8am-5:30pm pst

(UTC - 8)

Email: ATVinfo @ hamtv.com

Tom

& Mary Ann

(W6ORG)

(WB6YSS)

Page 1 TX70-5s 70 CM ATV TRANSMITTER USERS MANUAL The TX70-5s transmitter is designed to provide >4Watts peak envelope power (sync tip) of video modulated RF in the 70 CM (420-450 MHz) amateur band on any of 4 switch selected frequencies - 439.25, 434.0, 427.25 and 426.25 MHz - with a duty cycle of 15 minutes on and 5 off.
Page 2: Rear Panel
XMIT / REC switch is in REC and open when in XMIT. 2 AMP FUSE INSIDE. The TX70-5s itself draws about 1.5 amp in transmit, and .1 amp plus external downconverter in POWER INPUT JACK. A 4 pin plug 2 ft cable is provided for receive - A 2.0 amp 3AG fuse should handle both.
Page 3: Front Panel
450 MHz ATV downconverter or cable channel TV. depending on the TV sets audio IF gain and limiting. Downconverters for other bands are not connected to the TX70-5s, but rather to their own antenna and left on when This model has 4 synthesized CHANNEL SWITCH.
Page 4 ARRL SCM, or pick a night and time to start an ATV net. The TX70-5s is EXTERNAL LINEAR AMPLIFIER SET UP. There are...
Page 5 DX vs. POWER vs. ANTENNA GAIN. The >4W output of Since most paths are not line of sight, the distance the TX70-5s was chosen to provide an easy low cost entry will be lessened depending on the density and type of trees, into the world of ATV, but at the same time give flexibility to foliage, hills, buildings, etc., in the way.