Can no longer receive RTV on 87 and 137 W - HBCD modulation No Signal !

[TvMind]

Yes it is, and it cuts down the signal quality by 1/2 or more.

According to Chaparral the loss is closer to 1 db, not half or 3 db as you mention. Now I'm not crazy enough to 'tear' out the dielectic slab without damaging the antenna probe.
RTV on ku is weak, and it's SD not HD (S2). How much loss does the feedhorn cap contribute ? I'll pop it off and see. I've seen some commercial installations that leave them off despite the bug warnings.

[TvMind]

Hi Blind,

Thanks for chiming in here. No limbs or obstructions here for that satellite. No I don't have another HD box to try. I was really keen about the new Traxis but everybody (dealers) are telling me to stay away...hmm. No the 'bouncing signal' is a Geosat DVB-S2 issue, the standard DVB signals say on 137 W (Alaska nets) are all solid ! So disappointed with this HD stuff, especially since it's totally unnecessary (480interlaced) for classic tv shows.

[primestar31]

According to Chaparral the loss is closer to 1 db, not half or 3 db as you mention. Now I'm not crazy enough to 'tear' out the dielectic slab without damaging the antenna probe.
RTV on ku is weak, and it's SD not HD (S2). How much loss does the feedhorn cap contribute ? I'll pop it off and see. I've seen some commercial installations that leave them off despite the bug warnings.

Ok, I think you misunderstood me. I don't believe Chaparral in this case, because a dielectric plate inserted in a feedhorn to convert to circular signals is going to lose 3 db minimum, because it cuts 1/2 the signal level. That's just how they work, and you can't beat physics no matter what you think. A 3db loss is about the same as using a 7~ foot dish, instead of a 10 foot dish.

Maybe they can calculate a 1db loss in a perfect world, with a 20 foot dish where there's so much gain to start with or something, but it's false advertising to say there's only a 1db loss in every situation. Even so, 1 db equals a 26% signal loss in a perfect world.

If you still insist on trying for circular signals, Google "c band waveguide polarizer".

[TvMind]

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No absolutely, you can't argue with physics. So has anybody tried this, removing the dielectric I mean without damaging anything ?
I only went for this international feedhorn because it was on special and was practically new, if I knew it was going to cause such a significant loss and all the added grief I would plonked down the extra dineros and bought a regular Corotor II Plus.

Thanks Primestar for your sensible comments here.