SatSig topic:

trying to install a Direcway

(Read 10367 times)

Nov 11^th, 2007 at 8:08pm

Hi,
I'm albert & I'm trying to install a Direcway transmitter to an Channel Master 1.2Meter Dish, without any succes because the FeedHorn is completly defferent.

Do I need a adapter for this????

Best regards,

Albert

Nov 11^th, 2007 at 8:35pm

There are a dozen different DirecPC/Direcway/HughesNet TRIA configurations Albert. Maybe more. Some components are compatible/interchangeable, some aren't. Can't be of much help unless you're more specific. Photos would help

//greg//

Nov 11^th, 2007 at 8:45pm

Yes, you are right Sir.

One thing I don't know how to post (add) pics.

Best regards,

Albert

Images below inserted by Eric (forum admin)

Nov 15^th, 2007 at 3:20pm

Try this method - works well for us

Added by Admin...
Thanks for that picture. It shows the receive module at the top with horizontal receive polarisation. Presumably the satellite is about the same longitude as the site and the polarisation adjustment angle almost zero.
Best regards, Eric.

Nov 15^th, 2007 at 5:57pm

Hopefully I'm not creating problems where none actually exist, but I'm thinking Albert's got some compatibility problems Mel. Yours is an adapted OSIRIS, right? Albert's appears to be an ISIS. The ISIS is a cross-pol rig, and that Andrew feed he's got appears to be co-pol. Plus the Hughes LNB is integrated with an OMT. I see what also looks like an OMT on the Andrews feed. I'm a bit leery about OMTs in series. You're also attaching to the Hughes waveguide extension tube, and I don't believe the ISIS has one.

//greg//

Nov 16^th, 2007 at 2:31pm

With the method in the picture I placed we can adjust the RX polarity for H or V by just orienting the LNB 90º either way (fits right up), and then skew the entire feed/ODU for whichever TX polarity we need.

We placed the Transmitter in the center waveguide to allow the TX the strongest possible power. The Receive side did not seem to matter.

Nov 16^th, 2007 at 6:45pm

Yes Mel, but you're using the Hughes waveguide splitter. Albert's ISIS doesn't have one, and his Andrew rig appears to be co-pol only.

//greg//

Nov 16^th, 2007 at 7:13pm

This was the last image I received from Albert

The white OMT is being used to allow vertical polarisation to be transmitted and to cause horizontal receive polarisation signals to be routed up via the white filter. The smaller Hughes module that follows presumably contains an LNB and the question is which way it needs axially rotating at the joint to the white filter. The entry hole into the grey Hughes module is square, so there is ambiguity. It should definitely work one way. If it does not receive as it is then I would suggest turning the Hughes module 90 deg at the joint with the cable ties. Any ideas?

Best regards, Eric.

Nov 16^th, 2007 at 7:53pm

It's my understanding that particular (Hughes) waveguide passage is square to accommodate both linear polarizations without involving physical adjustment of the outdoor hardware. On the ISIS configuration, no rotations of the ODU components should be required. The desired POL angle is obtained by plus or minus zero to 90 degree rotations of the reflector. Polarization is selected via the modem user interface, and sent to the ODU via either 13v or 18v supply. Correct me if you disagree, but this is what I consider a crosspol rig.

Albert photos showed rectangular waveguide passages. Plus one of his emails stated his white feedhorn is only marked zero to 40 degrees in either direction. This is what I consider a co-pol rig. What I see happening here is trying to marry up a crosspol TRIA with a copol feed.

//greg//

Nov 16^th, 2007 at 8:58pm

That sounds hopeful. Albert needs to try alternative voltages to the LNB to see which one works.

The white filter sends horizontal polarisation into the Hughes module.

Best regards, Eric.

Nov 16^th, 2007 at 11:21pm

Quote:

The white filter sends horizontal polarisation into the Hughes module.

My point exactly. Even though Hughes leases transponder space on 11 satellites serving the Americas, VERY few offer coverage over Albert's lat/lon. A majority of the transponders are accessed with crosspol configured TRIAs, the rest with copol configured. I'm still awaiting his response as to which satellite/transponder Albert is currently assigned, if any. The answer bears heavily on how he lashes that rig together, if at all.

//greg//

Nov 29^th, 2007 at 6:37pm

What Albert really needs is TG type radio. Here is a photo of a 2w TG installed on a 1.2m CM antenna at a Sears conversion site this summer. He will be limited to crosspol transponders only.

Well how do I add a photo?

Nov 29^th, 2007 at 9:04pm

Unfortunately, there's no provision for forum members to add graphics to their posts yet. But here's what my OSIRIS/TG2 looks like:

//greg//