Channel master c120 feed horn wanted

[RimaNTSS]

What am I missing?

As it is already said, you are missing the adapter (consists of 2 halves). If you do not find the original one, I could try to make one for you. That would be more universal than original.

 

[ozumo]

Sorry the spare one I have doesn't fit the CM feed horn.

 

[Chris James]

Just remembered I may have a spare that came with the dish Dggrr gave me. I'll check tomorrow.

That would be great

 

[ozumo]

That would be great

Sorry the spares don't fit on the CM feed horn.

CM adapter on the left, the middle one is marked 3040735-03, right one 3040666-02. All have arrows pointing to antenna.

edit: do not search for the first model number, some quite disturbing results appear

 

[Chris James]

As it is already said, you are missing the adapter (consists of 2 halves). If you do not find the original one, I could try to make one for you. That would be more universal than original.

That would be a great help many thanks
Just keep having problems

 

[Lazarus]

edit: do not search for the first model number, some quite disturbing results appear

So they do (Not that I checked ....... )

 

[Channel Hopper]

As per the other feedhorn thread, I will take some dimensions this weekend, the feeds that I had were for receive and transmit and may have a waveguide that is tuned for uplink frequencies. Receive characteristics in the 11-12GHz band would be less important, opening the guide diameter by 1mm may help improve things.

OK, found one (eight bolt fitting, plus slot for chip fork dielectric plate) . Internal diameter is 18mm +/- 3% which from the formulae I am used to equates to a functional frequency range of 10.5 - 12.6GHz.

The minimum cut off for a circular waveguide at this diameter is 9.75 GHz, with upper in the region of 14.5 GHz when other factors take over creating losses, making a mid-range near 12.5GHz, which suggests an increase of the internal diameter from 18 to 19mm should assist in propagating the Ku band that everyone here is used to receiving with a universal LNB.

I still doubt Channel Master have messed up the focal point of their range of antennas (much less Andrew / Raven not picking up on the flaw) once buying up stock and then manufacturing of the same items.

 

[Chris James]

OK, found one (eight bolt fitting, plus slot for chip fork dielectric plate) . Internal diameter is 18mm +/- 3% which from the formulae I am used to equates to a functional frequency range of 10.5 - 12.6GHz.

The minimum cut off for a circular waveguide at this diameter is 9.75 GHz, with upper in the region of 14.5 GHz when other factors take over creating losses, making a mid-range near 12.5GHz, which suggests an increase of the internal diameter from 18 to 19mm should assist in propagating the Ku band that everyone here is used to receiving with a universal LNB.

I still doubt Channel Master have messed up the focal point of their range of antennas (much less Andrew / Raven not picking up on the flaw) once buying up stock and then manufacturing of the same items.

All very technical but to be honest I just want my setup to work not looking for the last bit of signal right now just want a working system I’ll worry when I get my foot in the door
I think that a 1,2 meter dish will do what I want it to do for now I would like to go c-band but dish size might be a problem
I still don’t know what I’m gonna get with my 1,2 channel master dish

 

[zorrin]

The black adapter, dimensions in this post:

Channel master smc 1.2m restoration

Hi all, I just started to restore a 1.2m Channel Master. Certainly installed by a "professional". it is an equatorial mount which was used for a fix installation. the fixing spacers are missing and nothing really prevented that in high winds the antenna turns ... cleaning, sanding, primer and...

www.satellites.co.uk

I will post the 3D files as soon as possible.

 

[zorrin]

I will post the 3D files as soon as possible.

3D files : channel Master feedhorn adapteur

Hi, Here you will find the 3d plan and 3d print file of the Channel Master feedhorn adapter.

www.satellites.co.uk