- Joined
- Jan 1, 2000
- Messages
- 16,245
- Reaction score
- 4,217
- Points
- 113
- Age
- 82
- My Satellite Setup
-
Triple Dragon, Dreambox 8000, Echostar AD3000ip, TBS6522,6925,6983 PCie cards.
Gibertini 1.25m motorised dish driven by the AD3000, with either Inverto BU Quad or Norsat / XMW Ka LNBs . SMW 1.05m + 3 other dishes. Speccy: Promax HD Ranger+
- My Location
- The Flatlands of East Anglia
This mod gives some adjustment to extend the Hughes LNB oscillator frequency well into Band C.
Although as Vipersan and myself have found, the Hughes is perfectly capable of encroaching into the lower region of that band, the fixed frequency of the DRO oscillator (no adjustment screw) negates further investigation of that Band.
Access to to the DRO can be achieved by opening up the metal screening can. It's not too difficult to do, it's quite thin - I simply scored round the small holes around the top of the can with a Stanley knife! You will blunt the blade after several runs around the holes, but I managed after replacing the blade a couple of times. I left one side, so that I just needed to bend it back (see pic) in case I needed to replace it as was ( if mod failed).
After drilling a hole in the cover, an M4 nut was Araldited onto the cover to take a 12mm M4 screw. This size screw can be screwed in fully without touching the DRO (essential).
Conveniently, the Neoprene strip on the underside of the cover gives a good seal to prevent water ingress through the screw hole.
In practice, careful screw adjustment now seems to give about 400 GHz extra reach on top of the maximum frequency I was previously able to lock (20792V 12.5W).
The feed on 5.2W 20880 is now centred between 20800 and 21000 using 19035 as the oscillator frequency.
Although as Vipersan and myself have found, the Hughes is perfectly capable of encroaching into the lower region of that band, the fixed frequency of the DRO oscillator (no adjustment screw) negates further investigation of that Band.
Access to to the DRO can be achieved by opening up the metal screening can. It's not too difficult to do, it's quite thin - I simply scored round the small holes around the top of the can with a Stanley knife! You will blunt the blade after several runs around the holes, but I managed after replacing the blade a couple of times. I left one side, so that I just needed to bend it back (see pic) in case I needed to replace it as was ( if mod failed).
After drilling a hole in the cover, an M4 nut was Araldited onto the cover to take a 12mm M4 screw. This size screw can be screwed in fully without touching the DRO (essential).
Conveniently, the Neoprene strip on the underside of the cover gives a good seal to prevent water ingress through the screw hole.
In practice, careful screw adjustment now seems to give about 400 GHz extra reach on top of the maximum frequency I was previously able to lock (20792V 12.5W).
The feed on 5.2W 20880 is now centred between 20800 and 21000 using 19035 as the oscillator frequency.