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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: 1033165" data-attributes="member: 369429"><p>Hi All,</p><p></p><p>I just wanted to give a quick update on how I have been progressing. I have straightened the dish using the structure shown in photo 1 & 2. I had split the dish into 12 segments using fishing line and then used the threaded bar to ease the dish into shape so that all the lines just touched in the centre. I have centred the Invacom feedhorn on the axis of the dish and set it to the calculated focal point and I have maxed out the signal as far as possible using alignment and adjusting the lnb (including skew). I have been maximising it using the SD transponder in image 4. I haven't as yet hooked up the HD machine- but I wouldn't be that confident as I had been hoping to push a higher reading on the above TP. </p><p></p><p>One questing I have relates to the Invacom adjustable Feedhorn. I did the calculations for the projection required and accurately set it using Vernier callipers. On Saturday, as an experiment, I tried adjusting the corrugated feedhorn as I though it would need 'tuned'. I tried it at half turn intervals. And you know what?- It made zip difference!! I tried the ring right along the threaded section and the signal strength and quality stayed exactly the same. I even tried the ring projecting a few threads beyond the waveguide and again it made no difference. Next I tried the corrugated ring completely off (just leaving the waveguide). In this instance the signal strength stayed the same but the quality dropped by 4%. Does this seem right? I admittedly don’t fully understand the purpose of the corrugated ring but I would have thought that it should have had more of an impact than this- especially as the projection is supposed to be important. Am I missing something?</p><p></p><p></p><p>Thanks Trev</p></blockquote><p></p>
[QUOTE="trev1978, post: 1033165, member: 369429"] Hi All, I just wanted to give a quick update on how I have been progressing. I have straightened the dish using the structure shown in photo 1 & 2. I had split the dish into 12 segments using fishing line and then used the threaded bar to ease the dish into shape so that all the lines just touched in the centre. I have centred the Invacom feedhorn on the axis of the dish and set it to the calculated focal point and I have maxed out the signal as far as possible using alignment and adjusting the lnb (including skew). I have been maximising it using the SD transponder in image 4. I haven't as yet hooked up the HD machine- but I wouldn't be that confident as I had been hoping to push a higher reading on the above TP. One questing I have relates to the Invacom adjustable Feedhorn. I did the calculations for the projection required and accurately set it using Vernier callipers. On Saturday, as an experiment, I tried adjusting the corrugated feedhorn as I though it would need 'tuned'. I tried it at half turn intervals. And you know what?- It made zip difference!! I tried the ring right along the threaded section and the signal strength and quality stayed exactly the same. I even tried the ring projecting a few threads beyond the waveguide and again it made no difference. Next I tried the corrugated ring completely off (just leaving the waveguide). In this instance the signal strength stayed the same but the quality dropped by 4%. Does this seem right? I admittedly don’t fully understand the purpose of the corrugated ring but I would have thought that it should have had more of an impact than this- especially as the projection is supposed to be important. Am I missing something? Thanks Trev [/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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