DTMF ic for keypad (radio mic upgrade)

[ntmobilerepairs]

Hi Folks !

Anyone aware of a DTMF ic that ouputs analog audio suitable to inject
into a 2way radio system,
Tandy/RadioShack used to make an acoustic DTMF encoder but these
appear unavailable now.

Any info appreciated !

Cheers,
Greg
rfnet.iinet.net.au

 

[Jeff Liebermann]

On Thu, 12 Feb 2009 19:02:12 -0800 (PST), ntmobilerepairs
<ntmobilerepairs@gmail.com> wrote:

Anyone aware of a DTMF ic that ouputs analog audio suitable to inject
into a 2way radio system,

<http://www.pipo.net>
<http://www.midians.com/html/specspage.asp?pname=TT-7&ptitle=DTMF+Encoder+Module&pcat=Encoders%2FDecoders&pline=Tone+Signaling>
<http://www.midians.com/html/specspage.asp?pname=TTE-7+KEYPAD&ptitle=DTMF+(Touch+Tone%26amp%3Breg%3B)+Encoder+Keypad&pcat=Encoders%2FDecoders&pline=Tone+Signaling>

Tandy/RadioShack used to make an acoustic DTMF encoder but these
appear unavailable now.

I have one. It's handy for HT's that don't have DTMF pads.
However, I prefer to use a digital voice recorder.
<http://www.amazon.com/Digital-Voice-Recorders-Audio-Video/b?ie=UTF8&node=227758>
I have pre-recorded tracks of my favorite repeater control codes that
I play into the microphone. For recording the DTMF tones, I just use
a dialer or ordinary phone played through the earpiece. I also have
the external mic and speaker from the voice recorder wired into a pair
of 3.5mm jacks on the radio, which also gives me an instant replay and
long term recording feature.

You can also have your computah generate tones using various programs
<http://www.polar-electric.com/DTMF/Index.html> (bottom of page)
or a dedicated circuit board:
<http://www.icircuits.com/prod_dtmfenc232.html>

There are more. Search Google for "DTMF encoder".

--
# Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
# 831-336-2558 jeffl@comix.santa-cruz.ca.us
# http://802.11junk.com jeffl@cruzio.com
# http://www.LearnByDestroying.com AE6KS

 

[Rich Webb]

On Thu, 12 Feb 2009 22:07:31 -0800, Jeff Liebermann <jeffl@cruzio.com>
wrote:

On Thu, 12 Feb 2009 19:02:12 -0800 (PST), ntmobilerepairs
ntmobilerepairs@gmail.com> wrote:

Anyone aware of a DTMF ic that ouputs analog audio suitable to inject
into a 2way radio system,

http://www.pipo.net
http://www.midians.com/html/specspage.asp?pname=TT-7&ptitle=DTMF+Encoder+Module&pcat=Encoders%2FDecoders&pline=Tone+Signaling
http://www.midians.com/html/specspage.asp?pname=TTE-7+KEYPAD&ptitle=DTMF+(Touch+Tone%26amp%3Breg%3B)+Encoder+Keypad&pcat=Encoders%2FDecoders&pline=Tone+Signaling


Tandy/RadioShack used to make an acoustic DTMF encoder but these
appear unavailable now.

I have one. It's handy for HT's that don't have DTMF pads.
However, I prefer to use a digital voice recorder.

It's also fairly easy to make one with a microcontroller, essentially by
using a pair of DDS generators. Atmel has an app note on it at
<http://www.atmel.com/dyn/resources/prod_documents/doc1982.pdf>. I built
one a while back out of curiosity and it seemed to work pretty well. The
general technique is adaptable to other uC families, of course.

Hosting the DTMF generator on a micro opens up the possibility of making
a "smart device," saving a few keystrokes and reducing errors.

--
Rich Webb Norfolk, VA

 

[David Nebenzahl]

On 2/12/2009 10:07 PM Jeff Liebermann spake thus:

You can also have your computah generate tones using various programs
http://www.polar-electric.com/DTMF/Index.html> (bottom of page)

I downloaded this, hoping to play with it (I'm actually interested in
seeing if I can approximate the old "Jeopardy!" sounds that they used to
play when setting up the board, which I believe were DTMF tones). But it
errors out when I run it ("Run-time error '-2147467259 (80004005)':
Automation error/Unspecified error"). Win2K Pro, SP3. Know of any
problems with this app?


--
Personally, I like Vista, but I probably won't use it. I like it
because it generates considerable business for me in consulting and
upgrades. As long as there is hardware and software out there that
doesn't work, I stay in business. Incidentally, my company motto is
"If this stuff worked, you wouldn't need me".

- lifted from sci.electronics.repair

 

[Jeff Liebermann]

On Fri, 13 Feb 2009 10:35:04 -0800, David Nebenzahl
<nobody@but.us.chickens> wrote:

On 2/12/2009 10:07 PM Jeff Liebermann spake thus:

You can also have your computah generate tones using various programs
http://www.polar-electric.com/DTMF/Index.html> (bottom of page)

I downloaded this, hoping to play with it (I'm actually interested in
seeing if I can approximate the old "Jeopardy!" sounds that they used to
play when setting up the board, which I believe were DTMF tones). But it
errors out when I run it ("Run-time error '-2147467259 (80004005)':
Automation error/Unspecified error"). Win2K Pro, SP3. Know of any
problems with this app?

I just downloaded a fresh copy and installed it on a clean computah.
XP Home SP3. Installs and runs fine. I do have a W2K machine at home
that I can try. There's only one version 1.0.0.0 so I don't think
it's an update issue. I couldn't find any requirments for libraries
(.NET, JAVA, Visual Basic, etc). Sorry, no clue why it won't run. The
error seems quite common:
<http://www.google.com/search?hl=en&q=Runtime+error+%27-2147467259+(80004005)&btnG=Google+Search>
but none of the hits seem to have anything to do with the problem. My
guess(tm) is that some Windoze library is out of date, corrupted,
trashed, or missing. Try:
<http://windowsupdate.microsoft.com> (select "custom")
and see what it wants to update.

You might also try doing a fast scan for malware and such. Download,
install, and update the free version of MalwareBytes:
<http://malwarebytes.org>
The "fast scan" is quite quick and catches lots of oddities.

I also have a DTMF encoder program that I wrote perhaps 15 years ago
in Borland Turbo Pascal. I'll do the world a favor and leave it
buried. I'm a terrible programmer.

There are other DTMF generators around. Google is your friend. This
one should work if you have JAVA installed. Give it time to load:
<http://www.dsptutor.freeuk.com/dtmf/ToneGenerator.html>

--
# Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
# 831-336-2558 jeffl@comix.santa-cruz.ca.us
# http://802.11junk.com jeffl@cruzio.com
# http://www.LearnByDestroying.com AE6KS

 

[DaveM]

"Jeff Liebermann" <jeffl@cruzio.com> wrote in message
news:5fubp4hjidqnkictf2iioon9nvtr2prn2u@4ax.com...

On Fri, 13 Feb 2009 10:35:04 -0800, David Nebenzahl
nobody@but.us.chickens> wrote:

On 2/12/2009 10:07 PM Jeff Liebermann spake thus:

You can also have your computah generate tones using various programs
http://www.polar-electric.com/DTMF/Index.html> (bottom of page)

I downloaded this, hoping to play with it (I'm actually interested in
seeing if I can approximate the old "Jeopardy!" sounds that they used to
play when setting up the board, which I believe were DTMF tones). But it
errors out when I run it ("Run-time error '-2147467259 (80004005)':
Automation error/Unspecified error"). Win2K Pro, SP3. Know of any
problems with this app?

I just downloaded a fresh copy and installed it on a clean computah.
XP Home SP3. Installs and runs fine. I do have a W2K machine at home
that I can try. There's only one version 1.0.0.0 so I don't think
it's an update issue. I couldn't find any requirments for libraries
(.NET, JAVA, Visual Basic, etc). Sorry, no clue why it won't run. The
error seems quite common:
http://www.google.com/search?hl=en&q=Runtime+error+%27-2147467259+(80004005)&btnG=Google+Search
but none of the hits seem to have anything to do with the problem. My
guess(tm) is that some Windoze library is out of date, corrupted,
trashed, or missing. Try:
http://windowsupdate.microsoft.com> (select "custom")
and see what it wants to update.

You might also try doing a fast scan for malware and such. Download,
install, and update the free version of MalwareBytes:
http://malwarebytes.org
The "fast scan" is quite quick and catches lots of oddities.

I also have a DTMF encoder program that I wrote perhaps 15 years ago
in Borland Turbo Pascal. I'll do the world a favor and leave it
buried. I'm a terrible programmer.

There are other DTMF generators around. Google is your friend. This
one should work if you have JAVA installed. Give it time to load:
http://www.dsptutor.freeuk.com/dtmf/ToneGenerator.html

--
# Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060

I have a couple old Visual Basic projects that I found a couple years ago, but
never used. As it happens, I just removed VB from my computer in preparation
for moving to a new PC. I should be able to compile them in a few days, If
you're willing to wait, I can send the executables to you when I get my new PC
on line and all my software installed.

--
Dave M
MasonDG44 at comcast dot net (Just substitute the appropriate characters in the
address)

Life is like a roll of toilet paper; the closer it gets to the end, the faster
it goes.