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'Me again, or another RADIO problem..'
2000\04\21@025723 by Milan Pavlica (YU7AEC)

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2000\04\21@082100 by Andy Kelley

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12c50x

On Fri, 21 Apr 2000 08:55:05 +0200 "Milan Pavlica (YU7AEC)"
<spam_OUTmpavlicaTakeThisOuTspamPTT.YU> writes:
{Quote hidden}

Andy K.
________________________________________________________________
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2000\04\21@140149 by David VanHorn

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At 08:55 AM 4/21/00 +0200, Milan Pavlica (YU7AEC) wrote:
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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

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2000\04\21@155618 by Josh Koffman

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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
.....joshyKILLspamspam@spam@mb.sympatico.ca
VE4KAJ

"Milan Pavlica (YU7AEC)" wrote:
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2000\04\21@162819 by Milan Pavlica (YU7AEC)
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Josh Koffman wrote:

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2000\04\22@095431 by paulb

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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.

2000\04\24@140328 by Djula Djarmati

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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

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2000\04\25@122716 by Milan Pavlica (YU7AEC)

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Djula Djarmati wrote:

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