Quote:
Originally Posted by glen4cindy
I am using the passthru, with my NA as primary.
I can press the front panel power button or the remote control power button, and the standby light comes on.
I can then control the dish via the Ultra hooked to the passthru.
If I turn the NA back on it regains control of the dish and the dish moves where the NA tells it to. When the NA is on, the ultra cannot move the dish. I've never tried to use both receivers at the same time, so I am not sure how the Ultra would act if the NA is on, I would think that it would be limited to whatever transponders were the same polarity.
It may also be that my arrangement would not function if the Ultra was hooked up first, I don't know and do not intend to try becauase it would be too hard to reverse them.
I cannot turn the rear switch off on the NA. If I do, the Ultra does not recieve any signal at all.
Hope this clears up how my setup is working. |
Thanks.
I think I was able to reproduce what you describe with my ULTRA, however I don't think it's a good idea to do it.
I noticed that you didn't say whether you were using a DC-block, so I figured that that is the only difference in our setups. So I turned off my Ultra (front button), and I took out my DC-block. Bingo... I was then able to get DiseqC AND DC voltage through the passthru. One big factor with MY setup was that I'm also using a
DiseqC switch downstream of my ULTRA, and that switch needs power to function, so when I turn off my Ultra, it kills the switch, and since I have a DC-block between the ULTRA and my
TWINHAN, the Twinhan can't turn on the DiseqC switch, so I got nothing. When I took out the DC-block, the Twinhan could turn on the DiseqC switch, and everything worked. Also, even with the DC-block, if I bypassed the DiseqC switch, signal still went through the passthru.
I was pretty sure that there was a built-in DC-block in the Ultra, because onec I checked the passthru for voltage while the Ultra was running, and I didn't detect any voltage at the passthru. However either I was wrong on my previous test, or else the DC-block only works one way, or perhaps it isn't enabled when in standby mode????
I have a schematic for the Ultra, however the schematic doesn't include the passthru, because it is inside the Sharp bs2f7vz0614 tuner, and I can't find a schematic of that.
Another puzzle just occurred to me. In the the test I did today, I demonstrated that while the Ultra is running, the Twinhan cannot change ports on my DiseqC switch. I think this means that DiseqC commands are blocked, because I don't think that the Ultra is sending continual commands to the switch, ie I think it only sends the commands when you change channels or something like that, and that the switch then stays in whatever state it was put in. So it seems like the Twinhan should have been able to change which port the switch was on if the passthru lets DiseqC through. So either the passthru blocks DiseqC while the Ultra is on, or else the DC-block blocks the DiseqC, which doesn't seem likely.
Anyway, thanks. You've demonstrated that I was completely wrong about how these passthru's work, however I am still too nervous to try what you are doing, ie running without a DC-block. I just don't know what would happen if the downstream receiver is trying to send one LNBF voltage, and the other receiver is sending the other voltage. That just sounds like something you'd want to avoid. I'm even nervous about running without a DC-block when the Ultra is turned off, because I'm not sure what happens when these components get power from the outside, when turned off.
Anyway, an interesting topic.