Installation Riddle with SL3 Multiswitch system

OK, here's the riddle, see if you can help me solve it.

I have two systems -- a legacy system, and a H21 receiver hooked up to an SL3 dish with 4-output multi-switch. Since the two dishes are near each other, I can connect either receiver to either dish.

Follow closely:

1. I can hook the legacy receiver to the legacy dish -- no problems
2. I can hook the H21 receiver to the legacy dish -- no problems
3. I can hook the legacy receiver to the SL3 dish -- no problems
4. If I hook the H21 receiver to the SL3 dish -- "Searching for signal"

It's not an SL3 dish alignment problem, right? The legacy receiver has a strong signal on the 101 in #3 above.

Can it be the H21? It works fine connected the legacy dish.

The H21 used to work fine on the SL3, but one day I turned it on and got "searching for signal". Since then, for the last several weeks, this riddle has baffled me.

I called directv and they walked me through several things, repeating set-ups, resetting the H21, etc, and said "it's not getting a signal, must be the dish alignment". Yea, but look at point #3 above.

When I hook the H21 up to the SL3, I tell the receiver that I'm now using an SL3 multiswitch, and immediately it can't find a signal. When I look at signal strengths, nothing on the 101.

What could it be? The B-Band converter? Does the B-Band converter affect the 101, or just HD sats? In #2 above the B-Band converter is still in place.

Dave

 

I cannot even get SD signals from the 101 when the H21 is connected to the SL3.

I get zeros on all readings from all satellites.

I have actually tried a new LNB, but no difference -- and remember, the SL3 does work when connected to the legacy receiver.

 

Regarding the b-band converter...

The H21 works fine on the legacy dish with the B-Band converter in place (101 only of course).

The H21 connected to the SL3 does not give any signal readings (101, 99, or 103) with or without the B-Band converter in place.

I am not using SWM, but rather a 4-connector multi-switch LNB.

 

I believe it was 771

 

I don't think my legacy receiver allows me to choose transponders at the meter screen.

Both receivers have a home run to the respective dishes. Since the dishes are side by side, I disconnect the home runs at the LNB's and switch them there

 

OK, new information.

Finally this weekend I found a way to get the H21 to work on the SL3 dish, and the answer is that just like on the legacy dish, the H21 will get a sat signal if the legacy receiver is also plugged up to that same SL3 dish.


Said another way -- the H21 receiver will work on either the legacy dish or the slimline 3 dish IF the legacy receiver (or presumably any other receiver) is also plugged into that same dish! If you disconnect the legacy receiver from whichever dish, the H21 receiver says "searching for signal".

Experts -- what does that tell you? Is there a problem with the DC voltage carried out to the LNB by the H21?

Dave

 

On the H21, nothing "apparent" happens when the "powering" receiver either changes channels or turns off.

For the non-powering receiver, I'm not noticing any missing channels. What would I be looking for on the various transponders?

 

Except.....early on when I thought the LNB was the problem I bought a second LNB. Right now I'm using the second LNB. What are the odds that both LNB's are bad? Possible, I guess.