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Mobile home holidays on the Isle of Wight

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4 man boat 21

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9 tent

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6v 100AH   28ea

 

 

dummy cctv cameras

 

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These motorised cameras will work either on 2 AA batteries or with a standard DC adapter (not supplied) They have a built in movement detector that will activate the camera if movement is detected causing the camera to 'pan' Good deterrent. Camera measures 20cm high, supplied with rawl plugs and fixing screws. Camera also has a flashing red led built in.

XXXX-camerab 

radio transmitters, video senders, bugs from bull electrical


Video Sender Kit

Just in are these new video sender kits, please note that it is not illegal  to own or build but once completed it may well be illegal to own one.

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A/V SENDER KIT

This kit provides you with wireless audio and visual transmission to a TV. The TV acts as a receiver, eliminating the need to buy a separate monitor. You can also hook it up to a VCR or a CCD Camera, and even set up a remote CCTV security system!

XXXX-VSXX2

Circuit Analysis:

Q3 VC 1 ~ C 13, C 16 and 13 all make up a colpitts oscillator circuit that fluctuates from 22O~25O MHz. You can regulate the frequency to any value within this threshold by tuning VC I or 13. C 13 modulates the signal rate. When the capacitance increases, so does the modulation. R9 and C 16 bias the local oscillation. If we lower R9’s frequency to 68OR the oscillator’s output level will increase.

Q2 and L2 act as a frequency doubler. C7, along with FCZ783R5 (IF Trans former), the Q4 transistor, C14, C19 and R12 all make up the mixer. This mixer takes both audio and visual signals together and "mix" them into one and passes through RF Amplifier Q I to transmit the signal to the antenna.

Testing:

1: Turning the blue component’s trimmer on VC 1 varies the frequency. When we turn the trimmer, the television’s channel has to be changed accordingly. It is easier to tune the A/V Sender if you have a spectrum analyser to help you find the correct frequencies. If the frequency is tuned to 474 MHz, then this would be the equivalent of your TV’s channel 14 UHF band.

2: The IF Transformer Is used to synchronise the audio and video frequency’s level ratio. If the TV’s image is too blurry then you can adjust the IFT to fine-tune the image.

3: SVR1 controls the video signal input ratio~ while SVR2 controls the audio portion. You can tune these components according to your needs.

 

Parts List:

Resistors 5% 1/8W

68R R1

4.3K R2

1K R3.R9,R15

6.8K R4,R7

2.2K " R5

560 R6

5.6K R8

470 R1O,R12

270K " R11

100 R13

10K R14,R17

1M R16

Capacitors:

2P (NPO) 2.54mm Cl, C2

22P (NPO) C3

103 C4,C8,C17

102 C9, C10, C15, C20

104 C21

3P (NPO) C11

12P (NPO) C6

470P C23

5P (NPO) C7,C13

47P (NPO) C16.C19

lOOP (NPO) C14,C18

220uF/16V (6Xllmm) CS

4.7uF/16V(4x7mm) C12, C22

lOuF/16V C24

 

Transistors:

2SC2369 or 2SC3358 Q1

2SC1674 Q2,Q3

2SC945 Q4, QS

Diodes:

Zener 11V/, 1/4W Dl

5V, D2(or 5.1V)

3V, D3(or 5.1V)

60-2

SVR1 1K/6mm (3 pin) SVR2 1OK/6mm(3 pin)

VCl / SP/ 6mm(2 pin)

LI d=3mm D=4mm O.7mm, 2T

.L2,L3 3T

End of parts list

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Complete kit excluding aerial and psu but including all components,

PCB  and a case is

XXXX-VSXX2


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