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Could I have disabled the modulator feature from the Dish 942?
This thread has 4 replies. Displaying all posts.
Post 1 made on Tuesday September 27, 2005 at 20:58
bennettavi
Active Member
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August 2003
675
Hooked many of these up, but never have I had the modulator just stop working. The dual mode is on and the TV2 LED is lit up.
This is what happened:

Everything worked perfect on TV1 (hitachi HDTV) and TV2 (older Toshiba 32"). Customer was hitting buttons on the RF Sat 2 remote and after that the picture is total snow. Not blue, not black. Snow only. My modulated channel is 22 and is set to AIR. I've reset the box several times, did a default reset, hooked a 13 in. Tv directly to the mod. output from the receiver and i still get nothing.

Had the modulator died? Or did the client somehow disable the modulated output? BTW, the composite output from TV2 works fine. He says it went out when he was playing with the page up and page down buttons. ???

Thanks for any input.
OP | Post 2 made on Wednesday September 28, 2005 at 19:49
bennettavi
Active Member
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675
solved.
Post 3 made on Thursday September 29, 2005 at 00:08
alebowgm
Long Time Member
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March 2005
375
how did you solve it?
OP | Post 4 made on Thursday September 29, 2005 at 19:03
bennettavi
Active Member
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Posts:
August 2003
675
Well, I switched the Dish 942 modulator setting to Cable and the equivalent channel was 73 and it worked. Why it worked, i don't know. Just happy it did.

The problem is that the old way worked just fine for a long while. Nothing changed. Just couldn't use AIR channel 22 anymore. .. ???
Post 5 made on Wednesday October 5, 2005 at 10:47
Ernie Bornn-Gilman
Yes, That Ernie!
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December 2001
30,104
When you switched the modulator to cable 73, did you change your TV to channel 73? Did you do that without resetting it to cable? If you did, then it had already been changed to cable, so it wouldn't see UHF 22 as 22. But it would have seen it as 73!

Years ago, when cable was the highest tech around, I would occasionally have interference in cable systems. The channel numbers that were interfering made no sense. Turns out, the interference was from broadcast stations that were leaking into the cable. This problem kept busting my head until I sat down and looked carefully at all the channel numbers and frequencies. I found that if you add 51 to a UHF channel number, you will get the equivalent cable channel number...at least, close enough in frequency for a TV to lock onto it.

That is why many of my cable systems had interference on 79; local UHF 28 was REAL strong, and this showed ingress. But now I had a tool to go looking for ingress, because the channel numbers were now predictable.

This breaks down somewhere around cable channel 90, but I haven't had enough problems to have to learn that equivalence.

This also explains why modulators that go from UHF 14 to 69 start at cable 65... 14 + 51 = 65. Also why, if you have ingress, you won't have problems between cable 13 and 65. Also, since antenna amps are built with two amp sections, one for 2 - 13 and one for 14 - 69 (cable 65 - ??), if you use an antenna amp with a cable signal, the channels in the middle will perform poorly. In fact, poor middle channel performance, say channels 40 - 50, is a good sign that someone used an antenna amp in a cable system.
A good answer is easier with a clear question giving the make and model of everything.
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