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· TRANSMIT MODE OPERATION
figured forThe other local oscillator crystals are purchased for optional TXlRX fre-
quencies and TV channels. To install a crystal, complete the following:
1. Remove the power cord, then remove the top cover.
2.
Use page 12 to locate the crystal socket (Y1 or Y2) and the corresponding
ADJUST (F1. or F2) on the circuit bQ~rd..
3.
Install the new crYstal in th~ socket as desired.
4.
Connect a video camera, Camcorder or VCR t~ the appropriate connector.
5.
Connect a power meter and reasonably well-matched load (less than 1.8:1
SWR) to the antenna coax connector of the VSB-70 to read transmit power.
6. Select the desired crystal by pressing the F1/F2 push-button.
7.
Press RECEIVE/XMIT
push-button switch to XMIT (red LED on).
8. Turn the power on and begin transmitting.
9.
Using a standard .075 inch hex non-metallic tuning tool (available at most
electronic supply stores), turn the F1 or F2 ADJUST (as appropriate) for maxi-
mum output signal on your power meter. When the signal strength is maxi-
mum, the oscillator is correctly tuned. If a series of lines or dots show on the
received picture, slightly retune the F1 or F2 adjust, accordingly.
6. TRANSMIT MODE OPERA TION
IWARNING!
WARNING!
I
NEVER TRANSMIT WITHOUT A LOAD!
Your VSB-70 needs a dummy load or antenna wIth a relatively
close Im-
pedance match connected
before transmitting.
Equipment damage may
resultfrom
transmitting
Into no load or a load resulting
In an SWR of more
than 1.8:1!
1. Check power, camera or VCR, microphone, television receiver and antenna
connections to VSB-70 connectors.
2.
Press PWR OFF/PWR ON push-button switch to ON (red LED lights).
3. To transmit live with your video camera, press the CAM OFF/CAM ON push-
button switch ON (latched in).
4.
Check your video camera or Camcorder for power.
5.
Press the VIDEO/CAMERA
push-button switch to CAMERA (latched in).
6. To transmit VCR video, press the VIDEO/CAMERA
push-button switch
(latched out).
7. Select transmit frequency:
F1 = 434.0 MHz, F2
=
439.25 MHz. Check that the F1/F2 switch is in the ap-
propriate position.
Optional frequencies: 421.25,~r
439.25 MHz (if installed). Check that
F1/F2 switch is set to the appropnate position ..
7
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