What's RF Modulator Chn38 for in Recivers?

bostephen · 01-07-2009

Hi Guys & Girls,

I have seen "RF Modulator Chn38" in Receivers but failed to use it. Whats the use of this item? Here is the picture showing.
h**p://www.satellites.co.uk/satellite/attachment.php?attachmentid=22682&stc=1&d=12464809 31

**Mickha** · 01-07-2009

t's just the default setting for the RF out, in case you want to connect it to your TV using the coax cable, you can usually change it, to avoid interference, but as most people use a Scart connection, or other, it is somewhat redundant.

**Analoguesat** · 01-07-2009

For distributing signals the old fashioned way using aerial cables instead of scart.

The advantage of rf distribution is its much much easier to distribute around the house - Ive got all my equipment cross wired in weird and wonderful ways so any of the receivers can be sent to any one of about three different places

**satelliteman** · 01-07-2009

Originally Posted by bostephen

Hi Guys & Girls,

I have seen "RF Modulator Chn38" in Receivers but failed to use it. Whats the use of this item? Here is the picture showing.
h**p://www.satellites.co.uk/satellite/attachment.php?attachmentid=22682&stc=1&d=12464809 31

Of course, must be noted a lower grade signal distribution to the TV. Exactly what is says on the tin, the A/V signal is modulated onto a RF carrier. The TV then has to de-modulate this signal. Ch38 represents an 8MHz wide channel with a vision carrier of 607.25Mhz

If using a scart or component connection, then no need to connect via RF mod.

bostephen · 01-07-2009

Could this be the way a receiver can send more than one channel so that selection can be done at the TV? If I may ask, how is this done?

**satelliteman** · 01-07-2009

Only the one output satellite channel at source can be distributed to other points via the modulator. You can of course daisy chain several receivers IN and OUT of the modulator so a 'TV' can tune into each of the receivers. The receivers would have to be set on different channel numbers in order for this to work.

If that's what you are referring to.

bostephen · 01-07-2009

Originally Posted by satelliteman

Only the one output satellite channel at source can be distributed to other points via the modulator. You can of course daisy chain several receivers IN and OUT of the modulator so a 'TV' can tune into each of the receivers. The receivers would have to be set on different channel numbers in order for this to work.

If that's what you are referring to.

Pliz post pictorial illustration if u can, of how this is wired.

**satelliteman** · 01-07-2009

Sorry it's too late to start drawing pictures

Example for connection of two receivers to one TV via co-axial.

Connect RF OUT from receiver one to the input of RF modulator on receiver two. Then output of receiver two to TV. Tune both receivers in.

bostephen · 01-07-2009

Originally Posted by satelliteman

Ch38 represents an 8MHz wide channel with a vision carrier of 607.25Mhz.

Would setting above or below 38 achieve a wider frequency (for whatever a purpose-maybe improving pic quality)?

**Analoguesat** · 01-07-2009

No they are all the same bandwidth - just the centre carrier frequency is different..

bostephen · 01-07-2009

Originally Posted by satelliteman

Sorry it's too late to start drawing pictures

Example for connection of two receivers to one TV via co-axial.

Connect RF OUT from receiver one to the input of RF modulator on receiver two. Then output of receiver two to TV. Tune both receivers in.

Very clear instructions!! Thx

Any idea about the maximum capacity of "stacking" the receiver signals that the modulator/s can manage?

**satelliteman** · 01-07-2009

Due to domestic RF modulators being 'double side band' only, care has to be taken as not to cause cross modulation problems. Also see regarding taboo channels > _http://www.kat5.tv/taboo.html

bostephen · 02-07-2009

Thank you guyz for your helpfulness, God bless you.

**HB13DISH** · 02-07-2009

One very important drawback for using RF modulator is that the audio by default would be mono, instead of stereo, while the AV output would be stereo.
Perhaps if your equipments has support for stereo (TV, VCR, etc.) using NICAM or other systems, then there might be a way to listen to stereo.

**iandoh** · 06-07-2009

Also change CVBS to RGB

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