A QUESTION

[latindj]

I may come off ignorant but i have a real question and was wondering if anyone would take the time and explane i had a freind a few years ago who was the PD at KILE 1560AM here in houston and i remember hearing that he was using a copler i'm not sure if this is the correct term or name but he was selling this special radio (not like a normal Am ,Fm sterio ) these radios would pick up his programing on what i belive was 90.9 here in houston and i belive only that frequency it's kinda wierd but i never understood how that worked but always wondered how 90.9 could do that i also remember seeing on a magazine radio caracol 90.9 here in Houston but it worked the same way .

 

[CW]

> I may come off ignorant but i have a real question and was
> wondering if anyone would take the time and explane i had a
> freind a few years ago who was the PD at KILE 1560AM here in
> houston and i remember hearing that he was using a copler
> i'm not sure if this is the correct term or name but he was
> selling this special radio (not like a normal Am ,Fm sterio
> ) these radios would pick up his programing on what i belive
> was 90.9 here in houston and i belive only that frequency
> it's kinda wierd but i never understood how that worked but
> always wondered how 90.9 could do that i also remember
> seeing on a magazine radio caracol 90.9 here in Houston but
> it worked the same way .
>
IF I read the poor typing above correct (the question wasnt ignorant but the spelling looked worse...sorry), what he was doing was possibly using a subcarrier on the FM to carry his programming. FM stations have several subcarriers available....53 and 67 kHz are used for RDS, background music (Muzak, etc) and reading servics..they are LOW level audio, not hi fi and require an external decoder tied to a FM radio IF stage (final detection stage in the radio) to be able to decode the subcarrier.

 

[latindj]

>Excuse my ignorance in typing quick but anywho does every Fm have a sub carrier and what vcoverage does it have the same as the main frequency??

 

[CW]

> >Excuse my ignorance in typing quick but anywho does every
> Fm have a sub carrier and what vcoverage does it have the
> same as the main frequency??

Every FM can HAVE subcarriers...Not ALL of them USE them....There are problems with such...subcarriers add noise to the main channel or the main will leak through on the subcarrier audio....the range is close to the main coverage...
though at the fringe it will drop out before the mono main signal because of its injection level (they are usually half the stereo injection level which is 10% max...so at that level, they can noise up real quick!)

 

[latindj]

> > >How about audio quality?? same as FM?? where does one go and get one of these encoders to lissen to station that are on a sub carrier

 

[gbranch]

> > > >How about audio quality?? same as FM?? where does one
> go and get one of these encoders to lissen to station that
> are on a sub carrier
>

I believe that there is or used to be a Vietnamese station on a subcarrier of one of the FM's in Houston. This question might be better asked on the Houston board.

Muzak used to be carried this way before they moved to Dish Network.

 

[CharlineTuneFish]

LatinDJ:

You know, for supposedly owning a station you know absolutely zilch about anything engineering wise. I'm willing to bet KLBO is falling apart at the seems.

Do you even have an engineer on staff?? I bet... NOT!