Motorola ts907 low hv

[Electronic M]

Originally Posted by timmy

Ok but I don’t understand how a video can play as good as it does and yet won’t Except the cable line what is the big difference between cable rf and dvd- rf modulator. How much should this slug be turned maybe I didn’t turn it enough.

Unless the modulator on the cable box is the same brand and model as the one on the DVD player there's no guarantee it will perform the same or even try to implement the NTSC standard to the same level of strictness or laxness. Consumer gear isn't broadcast gear so it doesn't all try to implement NTSC to broadcast standards....It usually does the minimum to not get a lawsuit or excessive customer complaints...How far (if at all) beyond that "don't sue me" threshold a maker goes is their discretion.

Does the cable box have a composite video and audio out? If it does why not connect that to the modulator you use for the DVD player if that modulator works better. If all the cable box has is RF and HDMI use a either a VCR to convert the RF to audio and composite video for the modulator or an HDMI to AV converter.
Analog composite audio video switch boxes are cheap at the thrifts if you need to have multiple video sources feeding the modulator.

[timmy]

Originally Posted by Electronic M

Unless the modulator on the cable box is the same brand and model as the one on the DVD player there's no guarantee it will perform the same or even try to implement the NTSC standard to the same level of strictness or laxness. Consumer gear isn't broadcast gear so it doesn't all try to implement NTSC to broadcast standards....It usually does the minimum to not get a lawsuit or excessive customer complaints...How far (if at all) beyond that "don't sue me" threshold a maker goes is their discretion.

Does the cable box have a composite video and audio out? If it does why not connect that to the modulator you use for the DVD player if that modulator works better. If all the cable box has is RF and HDMI use a either a VCR to convert the RF to audio and composite video for the modulator or an HDMI to AV converter.
Analog composite audio video switch boxes are cheap at the thrifts if you need to have multiple video sources feeding the modulator.

So what it comes down to is the IF strip is out of alignment.

[Electronic M]

Originally Posted by timmy

So what it comes down to is the IF strip is out of alignment.

Probably. It could also be that the cable box has such a lousy modulator that some sets don't work well with it. I typically only use Blonder Tongue modulators to feed my sets because I've had cheaper consumer modulators so lousy that they would only work properly with some SS era sets...I know the BTs are professional enough that I don't have to worry about "don't sue me" level design becoming a problem with them so I try to stick to using the BTs.

Literally some of the cheap built in modulators in consumer cable boxes, VCRs, etc are so cheap they don't suppress the unused sideband of the video carrier causing interference with adjacent channels and issues with older sets tuning the wrong sideband, issues with audio RF level being wrong, incorrect output frequency, cascaded single osc modulators allowing over modulated video to create unfixable video buzz in the audio etc.

It could be either the modulator in the cable box or the alignment or both...It's up to you to figure out which. The run the cable box through the good DVD modulator idea I mentioned in my last post can help you determine which it is.

[timmy]

Originally Posted by Electronic M

Probably. It could also be that the cable box has such a lousy modulator that some sets don't work well with it. I typically only use Blonder Tongue modulators to feed my sets because I've had cheaper consumer modulators so lousy that they would only work properly with some SS era sets...I know the BTs are professional enough that I don't have to worry about "don't sue me" level design becoming a problem with them so I try to stick to using the BTs.

Literally some of the cheap built in modulators in consumer cable boxes, VCRs, etc are so cheap they don't suppress the unused sideband of the video carrier causing interference with adjacent channels and issues with older sets tuning the wrong sideband, issues with audio RF level being wrong, incorrect output frequency, cascaded single osc modulators allowing over modulated video to create unfixable video buzz in the audio etc.

It could be either the modulator in the cable box or the alignment or both...It's up to you to figure out which. The run the cable box through the good DVD modulator idea I mentioned in my last post can help you determine which it is.

The DVD player is plugged into an old rf modulator and ant out to the tv then I’ll disconnect and put the cable wire directly to the antenna terminal with the matching trans I don’t think cable signal could be that bad could it. I have a distribution amplifier that is 36db gain adjustable I could try that maybe the cable box signal is very weak. Well I just tried the rf amp no difference so back to the diddle stick.

[Electronic M]

Originally Posted by timmy

The DVD player is plugged into an old rf modulator and ant out to the tv then I’ll disconnect and put the cable wire directly to the antenna terminal with the matching trans I don’t think cable signal could be that bad could it. I have a distribution amplifier that is 36db gain adjustable I could try that maybe the cable box signal is very weak. Well I just tried the rf amp no difference so back to the diddle stick.

This is confusing sentence structure and word choice. Are you trying to say you have analog cable from the wall and are connecting it directly to the TV?

A consumer cable box isn't necessarily going to have a good modulator let alone a broadcast quality modulator in it.
If one modulator works good with the TV and another doesn't, then just stick with what works and stop bringing extra variables into play.

[timmy]

Originally Posted by Electronic M

This is confusing sentence structure and word choice. Are you trying to say you have analog cable from the wall and are connecting it directly to the TV?

A consumer cable box isn't necessarily going to have a good modulator let alone a broadcast quality modulator in it.
If one modulator works good with the TV and another doesn't, then just stick with what works and stop bringing extra variables into play.

I have a cable box and with a splitter I run a cable and with the matching trans on the back of the set that’s how I use it and all my b&w sets work fine and the only time I use a rf modulator is to run the DVD player I’m not running cable in the modulator only for dvd. I have always used a cable from a box but this is the first time for this tv here since I only just got cable I had direct tv befor and all my color sets worked now I only have this one Motorola color. So this cable box may not be compatible with this Motorola.