Lost evens on 119

[s2digital]

Hi everybody -- I'm getting 90+ signals for everything on Sat A and C. But in the past few days I've noticed that my Sat B reception has seriously degraded. All the even transponders are at 0, and the odds hover between 25 and 50.

I'm experiencing this on 3 different receivers on 3 separate lines to the dish.

I have no tree blockage problem at all. And the pitch of my roof certainly hasn't changed in the past week or so. So....

Does this definitively mean my LNB is bad? My dish is the new style 18x20 with the combined LNB / multiswitch pack (4 coax connectors coming out).

Thanks!

[greywolf]

Either the LNB or multiswith can do this. If you have an older Phase II dish with external multiswitch, the 18V Sat B cable may have a problem. With a unitized Phase III dish, the exact cause isn't so important as replacing the entire unit is the best remedy.

[jackp]

Hi and Hello,This dish has a multiswitch on the backside with 13/18 volts. How do i connected this to my disEqc switch?Its a smaller channel master dish with adjustable freuq.It has 2 lnbf on it,110 and 119 fta ch.Do DisEqc switch pass electric or pass volt thru?I think not

[greywolf]

Hi and Hello,This dish has a multiswitch on the backside with 13/18 volts. That's a Phase II with external multiswitch.


How do i connected this to my disEqc switch?Please provide the specific model. If it is a cascadable 4x8 or 5x8, you just take the 4 outputs from the multiswitch on the back of the dish and connect them to the four Sat inputs on the DisEqc with 4 lines of RG6 coax in any order. If it is not cascadable (no 22Khz tone generated) you need to replace the multiswitch on the back of the dish with the DisEqc. I did that with my 5x8 and made long lines from the LNBs to a place inside my attic. Connection order is vital in that case. The two connections from the Sat A(101) LNB must go to the two Sat A inputs while the two connections from the Sat B(119) LNB must go to the Sat B inputs.


Its a smaller channel master dish with adjustable freuq.LNB frequencies are not adjustable on any DirecTV dish.


It has 2 lnbf on it,110 and 119 fta ch.Do DisEqc switch pass electric or pass volt thru?I think notThat must be 101 and 119. Multiswitches all pass or provide the required DC voltages. The question is whether the 22Khz tone is generated. Again, you didn't specify the model. DisEqc makes a number of different multiswitches.

Take a look at the coax between the 18V Sat B terminal on the dish's multiswitch and the Sat B LNB. If it is loose or damaged you will get no signal on Sat B even numbered transponders. Most of the odd transponders are spot beams now and unusual numbers are typical.

[s2digital]

I have a followup to this -- I physically moved my Terk TV55 antenna from one spot to another, which uncoiled some wires. The Terk is multiplexed into one line coming off the dish, on the DISH side of the outside grounding block.

In any case, all my Sat B signals came back, up unto the 80s. This stayed for several hours, and then gradually dropped back to the 40s and 50s. This is pretty uniform across all transponders on B, and Sat A and C transponders all seem unaffected, with signals into the 90s.

Could this be some sort of grounding problem?

My next idea was to take the Terk TV55 powered antenna out of the loop.

Any more ideas??

[greywolf]

Where in the system is the antenna power supply? If the power from that supply can reach the dish it will screw things up nicely. The receiver puts out a 13VDC signal for odd transponders and an 18VDC signal for even transponders. If the antenna power supply puts power into the same line, the signals don't work properly. Did you know Terk antennas have a reputation for being overpriced and underperforming? An unamplified Channel Master, Winegard or Antennas Direct might be a good idea

[chelsea]

This is a heat issue. Affects areas with approxiametely upwards of 90 degrees.
Check after 9pm or later when heat drops or pour a pitcher of water on lnb to
cool off to verify.

[greywolf]

I've had 100 degree days with no problems. Another possibility whenever moving cable causes a change is a bad connection.

[s2digital]

I don't think this is a heat issue. If anything the setup behaves better in the daytime than at night. I've also now removed the antenna from the system entirely, but that doesn't seem to have done anything. I do have a replacement LNB/multiswitch assembly and am thinking that's my next step.