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The dish signal is 12.016 Ghz. If the LNB converts this to a 1 Ghz signal
to the coax, then 100 feet of high quality RG 6U foam coax will attenuate
the 1 Ghz signal by about -9dB. Therefore the voltage measured at the
receiver end will be about 1/3 of the voltage at the dish LNB - just as you
are measuring. There is probably nothing wrong with your coax.
What are your AGC and SQ readings on the BMI receiver? That determines if
you have adequate signal. You should be reading 3.6V and 0.3V for optimum
reception. One minute missing ES bars sounds like a BMI data problem, not
a dish reception problem Only so much data can be pushed through a 38.4 kb
wide pipe.
At 12:09 AM 10/6/02 -0700, you wrote:
>I'm trying to solve an intermittent data loss problem...one minute bars
>missing on the ES2Z charts(TS4), sometimes 10-20 a day. I've measured the
>signal level(using a small satellite finder signal level device-shows
>relative levels) at the dish and at my BMI receiver. There is quite a
>difference, signal at the receiver is 1/3rd the level of that at the dish.
>I've made the same measurements using a different(new) RG 6U cable and the
>problem is the same. Does anyone know if the length of the cable could be
>an issue, one cable is 50ft long, the other one longer(probably 100 ft).
>Both are RG 6U.
>
>I've also noticed that when the measuring device is hooked up next to the
>receiver the level will sometimes vary up and down in a short period(2-5
>seconds). One thing both cables have in common is that I have replaced the
>F connectors on some of the cable ends. I have a good quality crimper, but
>is it possible to do this so poorly that it would cause this signal loss.
>Would measuring the cable with an ohm meter show anything?
>
>I'd welcome any suggestions...at this point my TS4 is useless for serious
>trading.
>
>John
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