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AMATEUR TELEVISION
AMATEUR TELEVISION
What is Fast Scan ATV
What is Fast Scan ATV
ATV Bands and Frequencies
ATV Bands and Frequencies
ATV Bands and Frequencies
ATV Bands and Frequencies
ATV Bands and Frequencies
ATV Bands and Frequencies
ATV Bands and Frequencies
ATV Bands and Frequencies
How much does it cost
How much does it cost
Video sources
Video sources
Video sources
Video sources
Video sources
Video sources
Video sources
Video sources
DEMO
DEMO
Video sources
Video sources
144
144
P0  Trace of a picture barely visible extreme noise and often
P0 Trace of a picture barely visible extreme noise and often
P1 Picture visible but very noisy Only larger objects can be seen
P1 Picture visible but very noisy Only larger objects can be seen
P2 More picture detail visible but noisy with weak and unstable colour
P2 More picture detail visible but noisy with weak and unstable colour
P3 Good picture detail with small items visible, good colour but still
P3 Good picture detail with small items visible, good colour but still
P4 Very good picture with slight noise visible
P4 Very good picture with slight noise visible
P5 Perfect picture with no noise
P5 Perfect picture with no noise
70cms (435Mhz) Band Equipment
70cms (435Mhz) Band Equipment
70Cms
70Cms
70Cms
70Cms
70cms
70cms
DEMO
DEMO
70Cms
70Cms
70Cms
70Cms
70cm Modulators
70cm Modulators
Example of a Simple modulator
Example of a Simple modulator
Modifications to a typical PA
Modifications to a typical PA
Remove Collector Decoupling Components
Remove Collector Decoupling Components
Isolate the collector of the final transistor
Isolate the collector of the final transistor
Connect the Modulator
Connect the Modulator
Completed Modification
Completed Modification
23cm (1
23cm (1
Complete 23cm Transceiver
Complete 23cm Transceiver
Junk box antenna for 23cm
Junk box antenna for 23cm
Junk box antenna for 23cm
Junk box antenna for 23cm
Junk box antenna for 23cm
Junk box antenna for 23cm
Strip a length of wire 48cms long and bend 90
Strip a length of wire 48cms long and bend 90
Drill a hole in the centre of the dish and conduit box to fit the
Drill a hole in the centre of the dish and conduit box to fit the
Next, fit the conduit box onto dish with the cable gland entry at the
Next, fit the conduit box onto dish with the cable gland entry at the
Use a soldering iron to heat the wire to melt the box while pressing
Use a soldering iron to heat the wire to melt the box while pressing
Use hot-melt glue gun to seal the connections and then fit the lid to
Use hot-melt glue gun to seal the connections and then fit the lid to
23cm RX from the Junk Box
23cm RX from the Junk Box
13cm (2
13cm (2
Complete 13cm Transceiver
Complete 13cm Transceiver
A Junk-box Antenna for 13cm
A Junk-box Antenna for 13cm
Construction
Construction
Drill a hole in the centre of the board and use a reamer to make exact
Drill a hole in the centre of the board and use a reamer to make exact
Strip the earth wire from 2.5mm twin and earth and cut a length to
Strip the earth wire from 2.5mm twin and earth and cut a length to
Find half way point and fold into a sharp 90
Find half way point and fold into a sharp 90
Solder the open ends of the element to the copper pipe as shown The
Solder the open ends of the element to the copper pipe as shown The
Strip 30mm from coax as shown
Strip 30mm from coax as shown
Crimp the cable to the rear as shown
Crimp the cable to the rear as shown
Vertically Polarized
Vertically Polarized
3cm (10Ghz) Band Equipment
3cm (10Ghz) Band Equipment
Complete 3cm Transceiver
Complete 3cm Transceiver
Gunn Oscillators
Gunn Oscillators
Modules can be tested by applying 7v between the gunn diode and ground
Modules can be tested by applying 7v between the gunn diode and ground
Simple 10Ghz Modulator
Simple 10Ghz Modulator
10Ghz ATV bits  Where to buy
10Ghz ATV bits Where to buy
23cm Where to buy
23cm Where to buy
13cm Where to buy
13cm Where to buy

: AMATEUR TELEVISION. : Jo. : AMATEUR TELEVISION.ppt. zip-: 4701 .

AMATEUR TELEVISION

AMATEUR TELEVISION.ppt
1 AMATEUR TELEVISION

AMATEUR TELEVISION

2 What is Fast Scan ATV

What is Fast Scan ATV

Fast scan TV is the transmission of real time TV pictures just like you see on your TV set

ATV allows visual QSOs so you can see your contact

3 ATV Bands and Frequencies

ATV Bands and Frequencies

70cms typically 435 436.5 Mhz

Monochrome transmission if using AM modulated carrier

Colour permissible if using Vestigial Side-band (VSB)

Colour and audio permissible when using digital transmission techniques which are currently under development by various suppliers (based on DVB-T) standards

4 ATV Bands and Frequencies

ATV Bands and Frequencies

The 23cms amateur band ranges from 1.240 to 1.325 GHz ATV simplex 1240 1260Mhz ATV repeater inputs typically are: 1248, 1249, 1255 and 1280Mhz

Repeater outputs range from 1308 1318Mhz

Full colour video and audio using either AM or FM Modulation

Nationwide network of ATV repeaters

5 ATV Bands and Frequencies

ATV Bands and Frequencies

Full colour video and audio using either AM or FM Modulation

Nationwide network of ATV repeaters

The 13cms Amateur band ranges from 2.310Ghz to 2.450Ghz

2.322 to 2.355Ghz & 2.370 to 2.390GHz ATV Simplex operation and ATV repeater inputs

Repeater outputs on 2.435, 2.440 and recently Being allocated to 2.420Ghz

6 ATV Bands and Frequencies

ATV Bands and Frequencies

The 10Ghz amateur band ranges from 10.000 to 10.500GHz

Full colour video and audio using either AM or FM Modulation

Nationwide network of ATV repeaters

ATV Repeater outputs typically 10.065 & 10.240 ATV Repeater inputs 10.315, 10.340 & 10.425Ghz

ATV Simplex operation typically between 10.225 to 10.250, from 10.350 to 10.368 and 10.412 to 10.437

7 How much does it cost

How much does it cost

Tx and Rx

70cm As little as ?10 23cm About ?150 13cm About ?150 10Ghz About ?50

8 Video sources

Video sources

Most people own a video camera and they can be utilised readily for ATV use. When in camera mode, most output a video & audio signal on the AV output socket. Their sensitive microphones provide excellent audio from anywhere in the shack

9 Video sources

Video sources

Modern digital video cameras often have video out for viewing photos on your TV set and provide a ready video source for ATV use. The memory cards can also Be loaded with test-cards made on a PC using MS paint or Paint Shop Pro etc and displayed using your digital camera via the video output.

10 Video sources

Video sources

CCTV cameras are available for a very modest price, some as low as ?20 new for a colour camera They are ideal for permanent installation into the shack and many budget cameras are supplied with a wide angle 3.6mm lens which is ideal for shack views

11 Video sources

Video sources

Digital photo viewers allow for cheap and easy test-card generation. They are available from ?29 and accept most types of digital camera memory cards. Test-cards can be downloaded from the internet ready to use.

12 DEMO

DEMO

13 Video sources

Video sources

A PC fitted with a video card with TV out can provide a great video source. Live video from your webcam, photos, AVI video files etc.

Dont throw out that old computer! A BBC, Spectrum, or Amiga amongst others are great for Test-cards

14 144

144

750Mhz

Operating & P reports

ATV calling and talkback frequency is:

ATV signal reports are given using the P grade which ranges from 0 to 5 Example

15 P0  Trace of a picture barely visible extreme noise and often

P0 Trace of a picture barely visible extreme noise and often

unstable

16 P1 Picture visible but very noisy Only larger objects can be seen

P1 Picture visible but very noisy Only larger objects can be seen

17 P2 More picture detail visible but noisy with weak and unstable colour

P2 More picture detail visible but noisy with weak and unstable colour

content

18 P3 Good picture detail with small items visible, good colour but still

P3 Good picture detail with small items visible, good colour but still

noisy

19 P4 Very good picture with slight noise visible

P4 Very good picture with slight noise visible

20 P5 Perfect picture with no noise

P5 Perfect picture with no noise

21 70cms (435Mhz) Band Equipment

70cms (435Mhz) Band Equipment

22 70Cms

70Cms

70cms ATV can be received using an up-converter such as the Microwave Modules or Fortop converters between your 70cm antenna and television receiver

23 70Cms

70Cms

Some TVs and video recorders also tune down well below 430Mhz especially older models Also, all analogue cable TV boxes

24 70cms

70cms

Suitability can be checked by using a low power transmitter on 435Mhz Tune the receiver to BBC1 and carefully tune down lower If you receive a blank picture stop transmitting. If the TV displays static when not transmitting and a blank screen when the transmitter is on you should be able to receive ATV

25 DEMO

DEMO

26 70Cms

70Cms

Transmitting ATV can be achieved by using a ready built transmitter such as the MTV435 by Microwave Modules

These can often be found on Ebay for about ?40

27 70Cms

70Cms

Mini-kits in Australia currently produce a transmitter kit for about ?35

28 70cm Modulators

70cm Modulators

A quick and cost effective way to get onto 70cm ATV is by using a modulator

An old radio can be easily be modified

If done correctly, the radio can still be used for standard voice operation

29 Example of a Simple modulator

Example of a Simple modulator

Points A&B are the video input

C&D is the +v supply and common

E is the modulated supply to the collector of the PA final transistor

Closing the switch (SW1) allows the radio to function as normal

30 Modifications to a typical PA

Modifications to a typical PA

31 Remove Collector Decoupling Components

Remove Collector Decoupling Components

32 Isolate the collector of the final transistor

Isolate the collector of the final transistor

33 Connect the Modulator

Connect the Modulator

34 Completed Modification

Completed Modification

35 23cm (1

23cm (1

2Ghz) Band Equipment

36 Complete 23cm Transceiver

Complete 23cm Transceiver

LCD Controller

Transmitter & Receiver

G6ALU 20W Power Amplifier kit

37 Junk box antenna for 23cm

Junk box antenna for 23cm

Parts Required:

The XYLs best flan dish 30cm diameter

38 Junk box antenna for 23cm

Junk box antenna for 23cm

Parts Required:

A Plastic Conduit Box

39 Junk box antenna for 23cm

Junk box antenna for 23cm

Parts Required:

Some 2.5mm diameter copper wire

A short length of RG213 or better

A plastic cable gland to suit coax

40 Strip a length of wire 48cms long and bend 90

Strip a length of wire 48cms long and bend 90

in centre

Bend again 90? as shown

And again to produce the double quad as shown below

Each side of the quad should measure 6cm

41 Drill a hole in the centre of the dish and conduit box to fit the

Drill a hole in the centre of the dish and conduit box to fit the

gland. Strip 5mm on the end of the coax as shown and tin the braid and centre core

42 Next, fit the conduit box onto dish with the cable gland entry at the

Next, fit the conduit box onto dish with the cable gland entry at the

rear of the dish. Insert the coax through the gland from the rear.

Solder the element to the coax with the centre bend of the element to the centre and the open ends to the braid. The element should be 3cm from the dish

43 Use a soldering iron to heat the wire to melt the box while pressing

Use a soldering iron to heat the wire to melt the box while pressing

down on the element to fix into position

44 Use hot-melt glue gun to seal the connections and then fit the lid to

Use hot-melt glue gun to seal the connections and then fit the lid to

the conduit box VSWR should be < 1.3:1 Adjustment is made by adjusting the distance of the quad element from the back plane

Gain is approximately 11 12dBi (8.5 9.5dBd)

45 23cm RX from the Junk Box

23cm RX from the Junk Box

An old analogue satellite receiver can be used to receive 23cm ATV. Simply connect the 23cm antenna to the LNB input. If there is no preamplifier in line, the DC LNB voltage must be disabled first of use a DC blocking capacitor in series with the coax centre conductor.

46 13cm (2

13cm (2

3Ghz) Band Equipment

47 Complete 13cm Transceiver

Complete 13cm Transceiver

LCD Controller

Transmitter & Receiver

Spectrian 30W Power Amplifier

48 A Junk-box Antenna for 13cm

A Junk-box Antenna for 13cm

Bi-quad antennas are easy to build and make a very simple and cost-effective antenna for local working 13cm ATV and for receiving GB3GG

49 Construction

Construction

Cut a piece of copper clad board 123mm x 123mm

Next cut a piece of ? inch copper pipe 50mm long

Cut a 2mm notch half way down the pipe as shown and file square

50 Drill a hole in the centre of the board and use a reamer to make exact

Drill a hole in the centre of the board and use a reamer to make exact

fit to the pipe

Insert the pipe through the board so the notched end is 16mm as measured from the copper side of the board

Solder the pipe to the board ensuring a good electrical connection and physical rigidity

51 Strip the earth wire from 2.5mm twin and earth and cut a length to

Strip the earth wire from 2.5mm twin and earth and cut a length to

244mm

This is the element Each side should measure 30.5mm

52 Find half way point and fold into a sharp 90

Find half way point and fold into a sharp 90

bend

Ensure both sides measure 30.5mm outside diameter Ensure symmetry

Find half way point and bend again as shown

Bend again to make a square Bend both sides to produce the quad shape as below

53 Solder the open ends of the element to the copper pipe as shown The

Solder the open ends of the element to the copper pipe as shown The

bend should sit inside the copper pipe notch but not touch the pipe. The element should be 16mm from the copper board

54 Strip 30mm from coax as shown

Strip 30mm from coax as shown

Fold back braid and strip insulation flush with braid. Cut centre conductor to leave 5mm as shown

Insert the coax into the copper pipe So the coax is flush with the bottom Of the notch and solder the centre conductor to the element as shown. Ensure the centre is not shorted to The braid

55 Crimp the cable to the rear as shown

Crimp the cable to the rear as shown

If a crimp tool is not available then carefully solder the braid to the pipe at the front

Completed Bi-quad antenna VSWR should be < 1.3:1 Adjustment is made by adjusting the distance of the quad element from the back plane Gain is approximately 11 12dBi (8.5 9.5dBd)

56 Vertically Polarized

Vertically Polarized

Horizontally Polarized

57 3cm (10Ghz) Band Equipment

3cm (10Ghz) Band Equipment

58 Complete 3cm Transceiver

Complete 3cm Transceiver

Gunn Diode Modulator

Gunn Oscillator

LNB

Analogue Satellite Receiver

59 Gunn Oscillators

Gunn Oscillators

Gunn diode oscillators can be obtained for about ?5. They can often be found in Dual-Tec PIRs and other Doppler type detectors

60 Modules can be tested by applying 7v between the gunn diode and ground

Modules can be tested by applying 7v between the gunn diode and ground

Using another module, connect a 50uA meter between the receive diode and ground

Here are the connections of a typical Doppler head. There are usually 3 connections, 7v (gunn diode), 0v and receive diode

61 Simple 10Ghz Modulator

Simple 10Ghz Modulator

The above circuit is a simple way to transmit 10Ghz video using a Gunn oscillator. It is video only with no audio provision for simplicity

62 10Ghz ATV bits  Where to buy

10Ghz ATV bits Where to buy

Bob Platts G8OZP 01283-813392 Gunn Diode Modulator Boards Modified LNB's Receiver Kits 24cm Pre-amps

George Lewczenko G6AKC 01366-728773 Gunn Diode TX Modules

S. Marshall G6NHG 01827-8979202 20db Horns & Slotted Waveguide Antennas

63 23cm Where to buy

23cm Where to buy

Tonna 23cm Antennas (Waters and Stanton) 20636 Tonna 23cm (ATV) (1240 - 1260MHz) 35 el Yagi ?64.95 20650 Tonna 23cm (ATV) (1240 - 1260MHz) 55 el Yagi ?84.95 Comtech Modules & ATV Controller www.13cm.co.uk 23cm PA Kit Steve Drury G6ALU www.radio-kits.co.uk 23cm Preamp kits www.mini-kits.com.au 23cm Preamp (ready built) Bob Platts G8OZP 01283-813392

64 13cm Where to buy

13cm Where to buy

Waters and Stanton 20745 Tonna 13cm (2300 - 2400MHz) 25 el Yagi ?69.95 Comtech Modules & ATV Controller www.13cm.co.uk Spectrian Power Amplifier Ebay Seller ID: Pyrojoseph Search for: 30W Class A Linear RF amplifier 2.3-2.45 GHz 2304 ATV

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