Difference between revisions of "Serit LNB DC supply"
(Created page with " A number of people on the BATC forum have reported their Serit tuners are no longer outputting the LNB voltage from one of the F sockets. The cause is inevitably an open circ...") |
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===LNB power supply with current limit for MiniTiouner=== | ===LNB power supply with current limit for MiniTiouner=== | ||
| − | In CQ-TV 265 Colin, G4KLB, | + | In CQ-TV 265 (Sept 2019) Colin, G4KLB, describes an add on PCB to provide current limiting using the RT5047 device. |
The PCB will be available form the BATC shop. | The PCB will be available form the BATC shop. | ||
Revision as of 11:33, 9 September 2019
A number of people on the BATC forum have reported their Serit tuners are no longer outputting the LNB voltage from one of the F sockets. The cause is inevitably an open circuit inductor (L101 or L102) after the output has been accidently short circuited.
This page describes how to repait the tuner and also a new PCB with DC current limiting available from the BATC shop.
Repairing the Serit DC output
It is very easy to blow up the RF choke feeding DC to the F type inputs before connecting to a dummy load or short circuit antenna - or by just shorting the centre pin to ground. The result is DC on the connector on the main board but no DC on the F type center.
Each F type is fed by a seperate RFC which looks like a ceramic capacitor and is shown in the picture below. These can be replaced with care with a normal leaded RFC or SMD RFC.
LNB power supply with current limit for MiniTiouner
In CQ-TV 265 (Sept 2019) Colin, G4KLB, describes an add on PCB to provide current limiting using the RT5047 device.
The PCB will be available form the BATC shop.
Parts list File:RT5047 LNB POWER REV 2-1 PARTS.xlsx
Schematic PDF File:RT5047 LNB Power.pdf
Schematic
PCB fitted to standard enclosure
PCBs
Wiring to MiniTiouner v2.0
