3.4
Adjusting the BVR-225/receiver part of BVX-225
The adjustment procedures below should be considered as guidelines only - please note that the
adjustments are not working fully independently, for example altering e.g. the RV2 will, to a certain
extent, influence the frequency response adjusted by RV3 and RV4 etc. Consequently several
readjustments of each adjustment might be necessary. Also note, that e.g. the RV3 is not a linear
adjustment, meaning that at certain points the level will "jump" up to 15 dB.
Use the table below as a introduction to the individual adjustments.
BVR-225/receiver part of BVX-225 adjustments
Designator Description
Adjustment order Comments
RV1
Output gain conn. A & B
1'st
Adjust to 1 V pp output
RV2
Middle frequency
3'rd
RV3
Low frequency
2'nd
Synchronisation pulse shape
RV4
Lower and middle frequency
Fine adjust
Needs to be adjusted only at cable lengths
beyond 1000-1500 meters
RV5
Middle and high frequency
Fine adjust
Needs to be adjusted only at cable lengths
beyond 1500 meters
RV6
High frequency
4'th
3.4.1
Adjusting with cable lengths up to approx. 1000 meters
1. Turn all adjustments fully counter clockwise.
2. RV1: Adjust to 1 Vpp output (incl. sync. pulse) at connector A & B.
3. RV3: Adjust the shape of the synchronisation pulse.
4. RV2: Adjust the middle frequency part of the signal.
5. RV6: Adjust the high frequency part of the signal.
6. Fine tune using the adjustments mentioned above.
3.4.2
Adjusting with cable lengths beyond 1000 meters
1. Turn all adjustments fully counter clockwise.
2. RV1: Adjust to 1 Vpp output (incl. sync. pulse) at connector A & B.
3. RV3: Turn almost fully clockwise.
4. RV5: Turn fully clockwise.
5. RV6: Turn 3/4 clockwise.
6. RV2: Adjust to best overall signal response.
7. Fine tune using RV3, RV4, RV5 and RV6 in any combination and re-adjust RV1 to 1 Vpp.
Hint:
The video signal measured at the receiver end of the twisted pair cable with the receiver
connected should preferably be in the range of 0,7-1 Vpp in order to ease the adjustment.
Twisted pair video equipment Series 225
2800-00054
