Cleaning a C/Ku corotator and LO Frequency of this LNB?

[climy]

I got a free Chaparral C/KU band Corotor with a Ku LNB. I don't have any information from the manufacturer of this Ku LNB since it's a bit old. I gently cleaned the whole assy to remove dirt and corrosion inside the tube. Doing this, I removed the inner Ku tube and waveguide parts. I noticed the Ku tube had a protruding Copper antenna ~1/8 in. segment--that goes inside the Ku Waveguide. Noticing it did not have any "radiator" tip. By radiator, I mean it's the larger diameter piece on the tip of the short wire inside the Ku Lnb shown (picture). The good news C-Band works great. No Ku yet.

The Servo motor polerizer turns with the C-band "element" So I assume the mechanical part works.

Did I damage the Ku waveguide parts by removing them?

Did I loose the "radiator" tip on the Ku antenna?

What is the LO frequency of this LNB.

Thanks,
Climy

 

[turbosat]

Don't think you're really supposed to take those things apart, the old manuals always said "do not touch the probe!" I couldn't say if you have hurt it any though, since I don't know if it worked before the 'cleaning' or not. Just use 10750 for your LO, and find a satellite with known ku on it, see if you can coax anything out of it. Without a means to change the polarity you'll only get vertical or horizontal. Corotors were made for the older analog satellite receivers, the little motor on top of the feedhorn changed the polarity with voltage supplied by the receiver.

 

[climy]

Thank you for the advice. Yes I see that the servo adjusts H & V. I used it for manual adjustment while the weather is great outdoors. I have an Ortomode feed with H and V LNB's but there's not many FTA H transponders on 107.3W anyhow. I've never used a Ku LNB on this bird. Are there any pictures of the inside of the Corotor online?
Climy

 

[Martyn]

I can't tell you the local oscillator frequency, but I do know the manufacturer. It's JRC, or Japan Radio.

http://mc.njr.co.jp/eng.html

 

[climy]

Good ol Japanese electronic parts. They were the best.

 

[turbosat]

Not sure about photos, I had one awhile back, I'll check tomorrow and see if it's still in my storehouse of unused parts.

 

[Magic Static]

Hard to tell much about the inside from photos. This one has a dielectric plate in the KU feed tube as if it was intended for circular polarization. Not sure about that setup.