Titanium Satellite C1-PLL LNB F-connector

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cyberham

SatelliteGuys Master
Original poster
Jun 16, 2010
6,223
5,323
British Columbia
I'm writing this because it's a slow sunny Saturday and my sat stuff is all working well. In other words, this is low priority.

I've used the Titanium C1-PLL C-band LNB for over 4 years. It has worked flawlessly even down to 3.7 GHz since I have no 5G interference. I've used it on 1-metre, 1.2-metre and 7.5-foot dishes. It's very sensitive.

On the 7.5-foot dish now where it is installed, occasionally my receiver indicates the LNB is not detecting voltage. That is, no reading is shown for either signal or signal quality on the receiver. This is the same indication you get if you switch off the LNB voltage at the receiver. At different times, I've swapped out the RG6 going from receiver to LNB. I've also changed the F-connector on the end of the RG6 cable completely for a new connector. None of this has helped.

The issue seems to come along when the outside temperature changes fairly abruptly from, say, low or slightly below freezing at night to mildly warm in the day. To fix it, all I have to do is unscrew a little the F-connector probe which screws into the LNB and then screw it back in lightly but snugly using a light twist with a wrench. The voltage is then detected and the receiver works normally.

What causes this? I haven't measured the voltage at the LNB but it's possibly toward the low end of its spec since the cable is about 125 feet long. However as long as the receiver is showing an upscale signal level reading (not quality) then the receiver works completely normally.
 
One of two things come to mind.

1. The LNBF's female F-fitting's center wire or solder connection has broken from the PCB inside the housing. Slightly rotating the f-connector makes the center conductor contact the PCB.

Fix: Open the LNBF electronics cavity and check continuity and/or damage conductor damage. Resolder or solder the break.

2. The LNBF's female F-fitting cinch (center pressure prongs) have been bent open, so they don't make good contact with the coax cable center conductor.

Fix: replace the bulkhead F-fitting, use a watchmakers tool to reform the cinch to provide pressure on the connection, or to temporarily fix - slightly bend the coax center conductor so it better contacts the cinch when inserted,

F-fittings should only require finger tightening and a weather sealant. I never recommend using a wrench, except if needed to remove.
 

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