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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Advice on 1.9m prime focus dish & 4.8'e
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<blockquote data-quote="trev1978" data-source="post: 1033476" data-attributes="member: 369429"><p>The dish was on the roof of a former Stan James bookmakers!! I Paid the building owner £50 for it and the stand 7 years ago- although I wouldn’t say that represented valve for money given the time spent on it! I would estimate it is a 1980’s reflector. I would accept that the reflector is probably not top end by today’s standards but there has been an improvement with correcting the slight warp over the rim. The Invacom feedhorn was purchased from a retailer on eBay around the same time. </p><p></p><p> I did spend a lot of time centring the feedhorn on the dish. You cannot perhaps see it in the photo but I set up a fishing line running from the centre of the dish and struck it through the crossing point of the lines that I had set up running between opposite points on the rim of the dish. I adjusted the feedhorn so that it was centred exactly on this axis.</p><p></p><p>What is the exact point of the scaler rings? I remember reading (I think this forum) that the reflected signal from the dish should form a ‘cone’ running into the waveguide of the feedhorn with the focal point just inside the waveguide. If this is the case what function does the scaler ring serve? Certainly in my case is doesn’t seem to be doing a lot.</p></blockquote><p></p>
[QUOTE="trev1978, post: 1033476, member: 369429"] The dish was on the roof of a former Stan James bookmakers!! I Paid the building owner £50 for it and the stand 7 years ago- although I wouldn’t say that represented valve for money given the time spent on it! I would estimate it is a 1980’s reflector. I would accept that the reflector is probably not top end by today’s standards but there has been an improvement with correcting the slight warp over the rim. The Invacom feedhorn was purchased from a retailer on eBay around the same time. I did spend a lot of time centring the feedhorn on the dish. You cannot perhaps see it in the photo but I set up a fishing line running from the centre of the dish and struck it through the crossing point of the lines that I had set up running between opposite points on the rim of the dish. I adjusted the feedhorn so that it was centred exactly on this axis. What is the exact point of the scaler rings? I remember reading (I think this forum) that the reflected signal from the dish should form a ‘cone’ running into the waveguide of the feedhorn with the focal point just inside the waveguide. If this is the case what function does the scaler ring serve? Certainly in my case is doesn’t seem to be doing a lot. [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Advice on 1.9m prime focus dish & 4.8'e
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