Newsnet on Ka Band A

John

John

Enthusiast.
Messages
2,075
Location
North Nottinghamshire.
My Satellite Setup
Elite 2.2 PF - CM1.8 - CM1.2 - Gibertini 1.25.
Ku - Ka -C & Ext C.
PC cards-TM5402 receivers.
Promax FSM.
My Location
North Nottinghamshire.
Calibrated Spectrum in KA-Band A with self-modified GILAT LNB .

I also exchanged the quartz in 27 MHz.

regards



... did you take any pictures of the modded Gilat through the stages of work - would love to see them.
 
dreamsat1

dreamsat1

Member
Messages
92
My Satellite Setup
2,20m Kathrein, 3,7m Andrew, KU,KA,C,C-Ext. LNBs
My Location
germany
Hey John,
I tested the first time today. When it is dismantled I take pictures.

regards
 
dreamsat1

dreamsat1

Member
Messages
92
My Satellite Setup
2,20m Kathrein, 3,7m Andrew, KU,KA,C,C-Ext. LNBs
My Location
germany
1. Qarz is replaced by 27 MHz
2. Steam the filter
3. Install the SMA socket and attach the F adapter
4. Make the flange

Big thanks to Graham for the support
 

Attachments

John

John

Enthusiast.
Messages
2,075
Location
North Nottinghamshire.
My Satellite Setup
Elite 2.2 PF - CM1.8 - CM1.2 - Gibertini 1.25.
Ku - Ka -C & Ext C.
PC cards-TM5402 receivers.
Promax FSM.
My Location
North Nottinghamshire.
1. Qarz is replaced by 27 MHz
2. Steam the filter
3. Install the SMA socket and attach the F adapter
4. Make the flange

Big thanks to Graham for the support


Thanks for that, nice work. Graham (sband) was my inspiration as well with modding Gilat ODU's and helped me out a lot.
I have modded one for Band D and after a bit of careful scalar feed matching to my Gibby 1.2 found it to be a better performer than the stock Inverto Ka/Ku unit that is also being used. I did try a wr42 90°angle transition coming off the Gilat so as to make the whole unit more suitable to be made motorised for H/V use but the matching was poor and performance suffered.
 
dreamsat1

dreamsat1

Member
Messages
92
My Satellite Setup
2,20m Kathrein, 3,7m Andrew, KU,KA,C,C-Ext. LNBs
My Location
germany
I bought an adapter. This allows the waveguide to transition much better from rectangle to round. This has a gain of the signal of about 0.8 to 1.0 dB.

best regards
 

Attachments

John

John

Enthusiast.
Messages
2,075
Location
North Nottinghamshire.
My Satellite Setup
Elite 2.2 PF - CM1.8 - CM1.2 - Gibertini 1.25.
Ku - Ka -C & Ext C.
PC cards-TM5402 receivers.
Promax FSM.
My Location
North Nottinghamshire.
I also used the same transition on one of my Gilat mods when i tried the 90° angle bend approach. I think i will pull the Gilat out of storage at some stage and have a re-think on the feed design. The small section of wr42 waveguide was put in place to accept a 40mm collar for the lnb holder. I think i will remove that and also have a look at trying to get a better scalar match.

...........................................................................................................................................................................................................................................................................................................

Gilat mod..JPG
 
dreamsat1

dreamsat1

Member
Messages
92
My Satellite Setup
2,20m Kathrein, 3,7m Andrew, KU,KA,C,C-Ext. LNBs
My Location
germany
Hello John, where did you buy the 90 ° angle. I'm still looking for something like that.

regards
 
John

John

Enthusiast.
Messages
2,075
Location
North Nottinghamshire.
My Satellite Setup
Elite 2.2 PF - CM1.8 - CM1.2 - Gibertini 1.25.
Ku - Ka -C & Ext C.
PC cards-TM5402 receivers.
Promax FSM.
My Location
North Nottinghamshire.
dreamsat1

dreamsat1

Member
Messages
92
My Satellite Setup
2,20m Kathrein, 3,7m Andrew, KU,KA,C,C-Ext. LNBs
My Location
germany
That is not the right one. The waveguide has to be turned the other way around. (for high).
It looks in the picture almost as if you have built a waveguide cross?
 

Attachments

John

John

Enthusiast.
Messages
2,075
Location
North Nottinghamshire.
My Satellite Setup
Elite 2.2 PF - CM1.8 - CM1.2 - Gibertini 1.25.
Ku - Ka -C & Ext C.
PC cards-TM5402 receivers.
Promax FSM.
My Location
North Nottinghamshire.
That is not the right one. The waveguide has to be turned the other way around. (for high).
It looks in the picture almost as if you have built a waveguide cross?

We got rid of the transition thats on the actual Gilat itself by sawing off the end section of the casting and bolted straight onto the pcb. I then coated the whole assembly with plastic sealer to keep water ingress out.

..........................................................................................................................................................................................................................................................................................................
Gilat mod - angle feed. reduced image..jpg
 
dreamsat1

dreamsat1

Member
Messages
92
My Satellite Setup
2,20m Kathrein, 3,7m Andrew, KU,KA,C,C-Ext. LNBs
My Location
germany
OK, verry good:Y:Y
 
dreamsat1

dreamsat1

Member
Messages
92
My Satellite Setup
2,20m Kathrein, 3,7m Andrew, KU,KA,C,C-Ext. LNBs
My Location
germany
Hey John,
do I see this correctly, that the polarity changes when you turn the LNB?

regards
 
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