Wanted 23mm to 40mm spacer for LNB bracket

[elteluk]

Hi,

I have just received a second hand Channel Master feedhorn for an offset dish. It arrived without the plastic spacer which is needed to fit it in a standard 40mm LNB bracket.

Does anyone know where I can purchase an original channel master spacer or a generic 23mm to 40mm spacer?

If someone has a spare one collecting dust, I would gladly cover postage costs.

Thanks in advance.

 

[hairybadger]

Am sure I have a few spares but the postage from France would surely cost more than it costs to buy new

 

[elteluk]

Thanks for replying.

You are probably right about postage costs from France, although I cannot find original Channel Master spacers for sale anywhere. I'll keep searching, but may have to settle for a generic spacer which might actually be as good as the Channel Master ones.

 

[Archived-1]

Hi and welcome to the forum , give these a try .

http://www.satcomresources.com/products/Skyware-Global-Hardware-Kits

 

[Trust]

If its realy 23 / 40 mm i have several .
They fit into a envelop so sending it to spain would not be so expensive .

 

[Captain Jack]

For Channel Master feedhorn, you need a grooved adapter. Without modification, a 40mm > 23mm adapter won't work properly. It will grip the neck of the feedhorn but that's the wrong fixing point.

 

[elteluk]

Thanks for the useful info. I suspected that a generic spacer would not be suitable as it would mean the LNB/feedhorn combo would be mounted an inch or so from its ideal position relative to the dish.

It would seem I need to source an original Channel Master spacer.

I live in the UK but my folks live in southern Spain which is where the feedhorn will hopefully reside once I can locate the spacer. At present, they have a 1.4m offset dish with a universal quad LNB but it struggles to provide a solid signal on a number of channels on 28.3e. Unfortunately, a bigger dish is not a possibility
hence the upgrade to a C120 LNB and feedhorn.

So if anyone can help me find a suitable spacer for a channel master feedhorn in either the UK or Spain I would be forever grateful.

 

[Captain Jack]

I dare suggest making a spacer yourself - it's not difficult.

Also, which dish are you fitting it to? In my experience a CM feedhorn performs worse than a standard Black Ultra LNB on the 1.2m variety.

 

[dxsat]

I have some original CM spacers in Spain. I won't be there for a few weeks but could dig them out and post if you haven't located any by then. I may have a couple here in the UK as well buried in a box somewhere. Generic ones are unlikely to hold the feed tight enough.

 

[Channel Hopper]

I will have a few in the shed, just got to dig them out.

Where in the UK are you ?

 

[elteluk]

I will have a few in the shed, just got to dig them out.

Where in the UK are you ?

I'm on the A12 between Brentwood and Romford.

 

[elteluk]

I dare suggest making a spacer yourself - it's not difficult.

Also, which dish are you fitting it to? In my experience a CM feedhorn performs worse than a standard Black Ultra LNB on the 1.2m variety.

It is an "unbranded" 1.4m dish. A new Black Ultra didn't perform very well and was eventually swapped for an Opticum which proved much better. I've heard that Black Ultras have quality control issues so it must have been a dud. I'm reluctant to buy another now based on my experience.

I'm not sure that a DIY spacer would be up to the job based on the combined size and weight of the feedhorn and LNB, but am willing to try. I still have a few weeks before I fit the LNB so might not need to go down the DIY route if I can source an original.

 

[Archived-1]

Just an enquiry, I will be fitting a feed horn to my CM 1.8, are we saying the spacers that come with it are not up to the job ?, if so any pictures of what I need to make please, this is what I have.

 

[nelson_b]

Hi - your spacers are just fine for use with the feedhorn -- been using them and the feedhorn for 15 years or so on my 1.8 cm no issues

 

[Captain Jack]

Agreed. Genuine spacers are designed specifically to hold the CM feedhorn to a CM dish, so no issues.

 

[Archived-1]

Thank you lads .

 

[Archived-1]

Sorry or the hijack elteluk,

been using them and the feedhorn for 15 years or so on my 1.8 cm no issues

What lnb do you recommend please nelson ?,

I need to buy one anyhow, and I would like to do my own tests on the 1.2, I know there are bad reports with the 1.2, but with the little mod ive done it only takes seconds to move the the dish arm up/down and I maybe able to find the G spot better, its got to be worth a go and maybe a first ?.

 

[nelson_b]

What lnb do you recommend please nelson ?,

I need to buy one anyhow, and I would like to do my own tests on the 1.2, I know there are bad reports with the 1.2, but with the little mod ive done it only takes seconds to move the the dish arm up/down and I maybe able to find the G spot better, its got to be worth a go and maybe a first ?.

Hi Martin -
I,v not altered anything on the 1.8 or 1.2 during the last couple of years (other hobbys have had priority - l.o.l.) but i,v tried many different arrangements in the past -- the 1.8 prefers a c120 - (off the shelf or home made) with the CM. feedhorn ................ best results for me on this dish has been with the inverto black pro and the older inverto white tech C120,s .... currently using the white tech as the black pro went a bit dull sensitivity-wise --- used a home made C120 made from an inverto black ultra twin for a while but it also went dull after a while .... very little difference in performance between the three of them to be honest -- happy enough with the white tech :-)

the 1.2 cm is quite different -- and i,v found generally prefers an l.n.b.f and had good results from many in the past -- the inverto black ultra being marginally the best -- there is only one C120 + feedhorn setup that has been equal to it and on some frequencies marginally better and that,s a smart titanium twin home made job and thats the one currently in use on this dish ...
(the reason its mounted upside down is so i can get further west before it hits the roof :-) )

 

[Archived-1]

Thank you nelson, I am looking forward to having a play in the near future, I love tinkering .

 

[Channel Hopper]

I'm on the A12 between Brentwood and Romford.

OK, and yes I have two pairs of them here, but I've just realised you are using a non- Channel Master clamping system for the feed assembly

The issue will be cutting off the outer grooving that are part of the moulding, and getting what remains to slot neatly in the clamp. Additionally the grooving is designed to clamp the feed at the exact focal point. Without these, you have to use a meter to get everything peaked up.
You may also find the ability to 'skew' the feed into the right position is affected unless you slacken the clamping bolts off completely.