Replacing the feed horn

[el bandido]

It will work, but it will probably not perform quite as well as a non-wideband model. There used to be c band transponders with tv channels below 3600 MHz that most of us could get. The wideband model covers all the way down to 3400 MHz. To do this, the antenna probe is made slightly longer to cover the lower band. In general, the wider band antenna (3400 MHz) is not as efficient as the shorter band antenna (3700 MHz). So you can expect to lose a small amount of signal with the wideband model.

[lme]

It is listed as 3.7-4.2ghz circular & linear polarity !

[el bandido]

See Attached .pdf file.

The Corotor II Plus receives linear C-Band signals in the 3.7-
4.2GHz range and linear Ku-Band signals in the 11.7-
12.7GHz range. The Corotor II Plus Wideband is for
receptions of circular and linear C-Band signals in the 3.4-
4.2GHz range and linear Ku-Band signals in the 10.95-
12.75GHz range. The Corotor II Plus Wideband features a
new low loss dielectric plate. The new dielectric plate provides
a lower noise temperature and improved cross polarization.

[lme]

Regarding the corotor 2 servo motor: is any way that a servo can be repaired ?
Next question is if a servo may be readjusted ?
I found an old servo but is rotating on the opposite direction and if installed on the feed horn will move the probe to the stop position.

[ArloG]

The first place to look would be the servo position feedback potentiometer. Give it a spritz of Deoxit or regular contact cleaner and work it from stop to stop gently. If you have and can use a multimeter, perform a resistance sweep and check for dead spots. Check post #21 in the link below.
First video is what you should see without the reduction gears in place.
Turning the gear meshing the pot will turn on the motor as it tries to drive the gear train (but it can't). When you stop turning the gear, the motor circuit is satisfied and turns it off.
The 2nd video is with all gears in place and turning the skew fine adjustment from an old Drake receiver.
If there's a dirty or dead spot in the pot. Hey! Imma' poet!......The feedback circuit won't know where the actual position should be and either "hunt" or drive to an extreme and the motor will stall.

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[el bandido]

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[lme]

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I've seen it, but is a china made bad copy of chaparral. I do have same DYNA !?!?
is not set for corotor2. They attach a "QC pass" sticker & they think is a good copy, but is not.

[lme]

I do have an old (china junk !) witch is rotating counterclockwise (from V-H!) instead clockwise (see servo1.mpg):

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The 2nd china junk is jumpy no matter what i adjust (see servo2):
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So, I guess there is no way to reset/adjust this servos. Every time i reposition the gear of the potentiometer it's reversing back to the factory position.
So far I'm using the original chaparral servo from the polarotor witch came with the dish.
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I'm waiting for a new chaparral servo hopping is not another china made copy !!

[el bandido]

IMO, that servo motor to rotate the probe is the ultimate for fine tuning. The problem though is it is outdated and no longer supported. It is also from a time where satellites had more issues with skew. Today, a dual lnb feed works better because thee are no moving parts to maintain. Best of luck on getting it fixed!

[lme]

IMO, that servo motor to rotate the probe is the ultimate for fine tuning. The problem though is it is outdated and no longer supported. It is also from a time where satellites had more issues with skew. Today, a dual lnb feed works better because thee are no moving parts to maintain. Best of luck on getting it fixed!

I understand that an orthomode feedhorn is more precise, but is hard to find a decent one as the market is flooded with china junk. Just an example is that DYNA servo: all holes are slotted just to make sure that can be installed. They do not care about the precise position of such device in the assembly. As for an original chaparral every hole is round & in the right spot. I just got my new chaparral servo today. pertaining the weather I'll try to replace it tomorrow.