Post by thread:Me again, or another RADIO problem..

12c50x On Fri, 21 Apr 2000 08:55:05 +0200 "Milan Pavlica (YU7AEC)" <spam_OUTmpavlicaTakeThisOuTPTT.YU> writes: {Quote hidden}> Hi! > I would like to build ROGER BEEP (those five tones which MOTOROLA > radios > generate every time whem transmit is pressed), BUT, i do not have a > lot > of space in my HT radio to put it in so i would like to build it > with > PIC..(For amateurs info, that i would like to put it in place for > CTCSS > enc/dec unit) > I need some small PIC - i need only one input and two outputs... > Any better idea, or can you help me with choice of PIC?? > THANKS! \ Andy K. ________________________________________________________________ YOU'RE PAYING TOO MUCH FOR THE INTERNET! Juno now offers FREE Internet Access! Try it today - there's no risk! For your FREE software, visit: dl.http://www.juno.com/get/tagj.

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 At 08:55 AM 4/21/00 +0200, Milan Pavlica (YU7AEC) wrote: {Quote hidden}>Hi! >I would like to build ROGER BEEP (those five tones which MOTOROLA radios >generate every time whem transmit is pressed), BUT, i do not have a lot >of space in my HT radio to put it in so i would like to build it with >PIC..(For amateurs info, that i would like to put it in place for CTCSS >enc/dec unit) >I need some small PIC - i need only one input and two outputs... >Any better idea, or can you help me with choice of PIC?? >THANKS! A word to the wise, such things are not accepted well in the ham community. If you must... It really dosen't matter what pic you use, though the F84 is probably the easiest to use. What you'll want is called a ladder D-A converter, which is a few resistors connected to the output pins. To generate a tone, just output the appropriate pin combinations over and over at some fixed rate. - -- Are you an ISP? Tired of spam? http://www.spamwhack.com A pre-emptive strike against spam! Where's Dave? http://www.findu.com/cgi-bin/find.cgi?kc6ete-9 -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 6.5.2 for non-commercial use <http://www.pgp.com> iQA/AwUBOQCxKIFlGDz1l6VWEQLDKwCg8t89OeRx79buodnS0//JY66UvkQAoKHW 6Of95FYFctOmHtgG9HnqBlsO =bQcB -----END PGP SIGNATURE-----

Milan, Just so you know, that isn't a "roger beep" that you are hearing. If I am correct, what you are hearing is a trunked repeater go ahead tone. It occurs when the radio queries the trunked controller, and is assigned a frequency. The radio then gives you the go ahead tone so you know you have a frequency, and that you are now able to transmit. It seems somewhat pointless to me to put this in a non trunked radio - what purpose can it serve? My understanding was always that a real "roger beep" is a tone that is transmitted when you release the PTT, so that those listening are sure you are done transmitting and that you aren't being blocked out by interferance, etc. In my experiance this tone is usually generated by a repeater not the radio. In any case, if you do decide to construct this, be careful, as I'm sure no radio manufacturer will be too pleased if you modify a radio then try to make them fix it :) Josh Koffman .....joshyKILLspam@spam@mb.sympatico.ca VE4KAJ "Milan Pavlica (YU7AEC)" wrote: {Quote hidden}> > Hi! > I would like to build ROGER BEEP (those five tones which MOTOROLA radios > generate every time whem transmit is pressed), BUT, i do not have a lot > of space in my HT radio to put it in so i would like to build it with > PIC..(For amateurs info, that i would like to put it in place for CTCSS > enc/dec unit) > I need some small PIC - i need only one input and two outputs... > Any better idea, or can you help me with choice of PIC?? > THANKS!

part 0 2023 bytes content-type:text/x-vcard; charset=koi8-r; (decoded 7bit) Josh Koffman wrote: {Quote hidden}> Milan, > Just so you know, that isn't a "roger beep" that you are hearing. If I > am correct, what you are hearing is a trunked repeater go ahead tone. It > occurs when the radio queries the trunked controller, and is assigned a > frequency. The radio then gives you the go ahead tone so you know you > have a frequency, and that you are now able to transmit. It seems > somewhat pointless to me to put this in a non trunked radio - what > purpose can it serve? My understanding was always that a real "roger > beep" is a tone that is transmitted when you release the PTT, so that > those listening are sure you are done transmitting and that you aren't > being blocked out by interferance, etc. In my experiance this tone is > usually generated by a repeater not the radio. In any case, if you do > decide to construct this, be careful, as I'm sure no radio manufacturer > will be too pleased if you modify a radio then try to make them fix it > :) > > Josh Koffman > joshyKILLspammb.sympatico.ca > VE4KAJ > > "Milan Pavlica (YU7AEC)" wrote: > > > > Hi! > > I would like to build ROGER BEEP (those five tones which MOTOROLA radios > > generate every time whem transmit is pressed), BUT, i do not have a lot > > of space in my HT radio to put it in so i would like to build it with > > PIC..(For amateurs info, that i would like to put it in place for CTCSS > > enc/dec unit) > > I need some small PIC - i need only one input and two outputs... > > Any better idea, or can you help me with choice of PIC?? > > THANKS! Content-Type: text/x-vcard; charset=koi8-r; name="mpavlica.vcf" Content-Transfer-Encoding: 7bit Content-Description: Card for Milan Pavlica (YU7AEC) Content-Disposition: attachment; filename="mpavlica.vcf" Attachment converted: definition:mpavlica.vcf 1 (TEXT/CSOm) (00010803)

Josh Koffman wrote: > In any case, if you do decide to construct this, be careful, as I'm > sure no radio manufacturer will be too pleased if you modify a radio > then try to make them fix it Of course <reminisce> in the old days, radios came with circuit diagrams and Amateurs had the skills to repair them. </reminisce> Perhaps you could build your circuit and take it to an *authorised* service outlet to be installed for a small fee? Now, if the tone is for making nifty noises to impress the listener, an 8-pin chip with internal oscillator will do fine. If however the tones must be accurate, you might be better to use a crystal oscillator, but you still have 4 I/O pins available on a 12C508. A ladder network is one option; but PWM ("magic sinewaves") should be quite practical. -- Cheers, Paul B.

I have a product similar to the one you need. It is used by taxi drivers so when they press the transmit button, the operator gets their number on the display. This is a 4x6cm PCB with PIC16C54. It generates 5 tones 70 or 100ms long. You can select the code with jumpers. It has a crystal oscillator, sinewave output, mic shutdown (when transmiting the sequence) and adjustable Vout. Contact me if you want to build it/buy it. Djula ---------- {Quote hidden}> From: Milan Pavlica (YU7AEC) <.....mpavlicaKILLspam.....PTT.YU> > To: EraseMEPICLISTspam_OUTTakeThisOuTMITVMA.MIT.EDU > Subject: Me again, or another RADIO problem.. > Date: 21 April, 2000 8:55 > > Hi! > I would like to build ROGER BEEP (those five tones which MOTOROLA radios > generate every time whem transmit is pressed), BUT, i do not have a lot > of space in my HT radio to put it in so i would like to build it with > PIC..(For amateurs info, that i would like to put it in place for CTCSS > enc/dec unit) > I need some small PIC - i need only one input and two outputs... > Any better idea, or can you help me with choice of PIC?? > THANKS! >

part 0 1588 bytes content-type:text/x-vcard; charset=koi8-r; (decoded 7bit) Djula Djarmati wrote: {Quote hidden}> I have a product similar to the one you need. It is used by taxi drivers > so when they press the transmit button, the operator gets their number > on the display. This is a 4x6cm PCB with PIC16C54. It generates 5 > tones 70 or 100ms long. You can select the code with jumpers. It has > a crystal oscillator, sinewave output, mic shutdown (when transmiting the > sequence) and adjustable Vout. Contact me if you want to build it/buy it. > > Djula > > ---------- > > From: Milan Pavlica (YU7AEC) <mpavlicaspam_OUTPTT.YU> > > To: @spam@PICLISTKILLspamMITVMA.MIT.EDU > > Subject: Me again, or another RADIO problem.. > > Date: 21 April, 2000 8:55 > > > > Hi! > > I would like to build ROGER BEEP (those five tones which MOTOROLA radios > > generate every time whem transmit is pressed), BUT, i do not have a lot > > of space in my HT radio to put it in so i would like to build it with > > PIC..(For amateurs info, that i would like to put it in place for CTCSS > > enc/dec unit) > > I need some small PIC - i need only one input and two outputs... > > Any better idea, or can you help me with choice of PIC?? > > THANKS! > > Content-Type: text/x-vcard; charset=koi8-r; name="mpavlica.vcf" Content-Transfer-Encoding: 7bit Content-Description: Card for Milan Pavlica (YU7AEC) Content-Disposition: attachment; filename="mpavlica.vcf" Attachment converted: definition:mpavlica.vcf (TEXT/CSOm) (00010D3D)