Catching up with reading - re Scatterpoint
January 19, page 10.
I have the Octagon 'Optima/Oslo' LNB with single output. The Xtal is on 27 MHz (well, 26.9996+). Markings on the LNB casing include 10 marks each side of a central "V" - which is different to that suggested by Jen (G4HIZ) in her excellent article.
BTW - no need to open up the LNB to find the
Xtal frequency - just place LNB close to an HF receiver! I
found the Xtal remarkably stable after leaving on all day, but
still purchased a TCXO recommended on the DL-AMSAT pages.
[DigiKey part No. CW655CT-ND for 27MHz, CW654CT-ND for 25 MHz]
73 Martyn G3UKV