Sometimes old LNBF is better than new...

[polgyver]

A few weeks ago I noticed occasional (intermittent) malfunction of one of 2-outlet LNBF. To confirm that it was LNBF, I swapped the cables on it. After some time, the malfunction showed up on the other receiver (and its TV).
Decided to give chance to older LNBF, which I modified 2 years ago, and sealed its front cap with ...
1-1/2 " shrinkable tubing (I had to stretch the tubing before putting it on LNBF and shrink with heat gun).
Conclusion?
Sometimes the older devices are more reliable than new ones...
Pictures (some annotated) follow :

 

[Cham]

Is the "seesat" a PLL LNBF? Maybe the extra circutry in a PLL causes premature failure due to heat? Always nice to have a spare!

 

[polgyver]

Probably Seesat is not PLL - otherwise it would be described as such on its label.
I do have extra spare PLL - this is waiting for 125 W.
For 97 W regular LNBF is good enough...

 

[Cham]

Suppose if they don't specify stability numbers... maybe you don't want to know... But if the oscillator did drift a bit on the seesat unit, maybe tuning up or down 1 MHz or two in local oscillator frequency would tell the tale, or if blind-scanning showed it was off frequency when tuning known TPs. Always interesting to find out the point of failure, even if it's not worth fixing.