From Newsgroup: alt.ham-radio.morse

I have heard about a device that will flash lights or vibrate some kind
of a device for operators that can't hear the tones. I have searched
google and as of yet can not find such a device that can be hooked to a standard HF radio and then used by a deaf person to receive Morse code.
Does anyone know where you can get one or how to build one that is
reliable and works reasonably well with weak signals?
--
Chris W
KE5GIX

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From Newsgroup: alt.ham-radio.morse

Hi Chris

Realizing you probably want something simpler than this, however a
PC/souncard running a spectrum analyzer pgm will show the dahs/dits
quite well. Even to the point where you may not be able to hear them
properly by ear.

In fact any radio digital mode pgm with a "waterfall" display can be
used in this way. I personally like to use a pgm called Baudline but
anything would do.

I'd suspect that the easiest way to do it in hardware would be an active filter opamp with some Q multiplier setup. The idea being to only
respond to a signal (say) 100Hz wide. Then output the waveform through a
diode and passive low past filter (maybe 500Hz/3dB) and onto a switching transistor and lamp globe.

Cheers Bob VK2YQA

Chris W wrote:

I have heard about a device that will flash lights or vibrate some kind
of a device for operators that can't hear the tones. I have searched
google and as of yet can not find such a device that can be hooked to a standard HF radio and then used by a deaf person to receive Morse code. Does anyone know where you can get one or how to build one that is
reliable and works reasonably well with weak signals?

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From Newsgroup: alt.ham-radio.morse

Chris W wrote:

I have heard about a device that will flash lights or vibrate some
kind of a device for operators that can't hear the tones. I have
searched google and as of yet can not find such a device that can be
hooked to a standard HF radio and then used by a deaf person to
receive Morse code. Does anyone know where you can get one or how to
build one that is reliable and works reasonably well with weak
signals?

Wouldn't one of those simple "disco light" controllers that were popular in the seventies do the trick ? They used to be available in simple solder-yourself kits that were rather cheap, and some of them would control three separate outputs (regular lightbulbs, one for each of bass, mid and treble) - each with adjustable frequency. Hooking up the mid to a suitable lamp would probably do the trick.
--
73 de LB3KB, Sigurd
http://justlearnmorsecode.com


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From Newsgroup: alt.ham-radio.morse

There are a number of stand alone small devices with electronic displays
that decode receive audio and display Morse code as scrolling text across
the display. They don't offer the opportunity to personally acquire the
skill to read Morse code in terms of dots and dashes, but from a practical standpoint could be of use to the deaf to see what's being said in morse
code. They might even be useful for leaning the code in conjunction with a blinking light or vibrator output for morse code. One is the MFJ-461 Pocket Morse Code / CW Reader, but there are other similar devices on the market
too. I think they're all under about $200. I don't have experience with
them to know which one works best.
73
Sparky

"Chris W" <1qazse4@cox.net> wrote in message news:Vm7Tf.35861$2c4.21117@dukeread11...

I have heard about a device that will flash lights or vibrate some kind
of a device for operators that can't hear the tones. I have searched
google and as of yet can not find such a device that can be hooked to a standard HF radio and then used by a deaf person to receive Morse code.
Does anyone know where you can get one or how to build one that is
reliable and works reasonably well with weak signals?

--
Chris W
KE5GIX

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From Newsgroup: alt.ham-radio.morse

Chris,

Cheap way is to buy a big open face speaker and teach the ham to feel the
code by putting his (her) fingers on the speaker cone. Many deaf have a
good sense of touch and they can feel when the speaker is vibrating. In the days before computers, this was quite common.

you could also build up a simple led lamp set up with a LM567 tone decoder. Not being a designer, I am not sure how wide you could make the bandpass.

DE KX5G
"CW - The Original Digital Mode"


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From Newsgroup: alt.ham-radio.morse

Many years ago, I used a simple circuit consisting of a diode, couple of resistors, and an LED. I took the non-grounded side of the speaker audio and fed it to the diode. I took the output of the diode and fed it to the base
of a transistor. I fed a couple of volts to the collector lead of the transistor. The emitter went to the LED which then went to ground. I had a bunch of parts in the parts box, so I played with the values until I found a combination that worked. You might need to put a current limiting resistor between the source of the voltage and the collector of the transistor to mitigate the brightness of the LED and keep the current going through the resistor and LED down to a safe level. You can experiment building the
circuit in steps, i.e., make sure the diode is conducting in step with the
CW before you continue with the circuit. You may have to couple audio with a feedthrough capacitor and limit it with another resistor in series to the base. Any general purpose NPN transistor should do the trick.

Jozef WB2MIC

"Russ Thompson" <russthom_@comcastdot.net> wrote in message news:wLydnRhEJcpnp4PZnZ2dnUVZ_sadnZ2d@comcast.com...

Chris,

Cheap way is to buy a big open face speaker and teach the ham to feel the code by putting his (her) fingers on the speaker cone. Many deaf have a good sense of touch and they can feel when the speaker is vibrating. In
the days before computers, this was quite common.

you could also build up a simple led lamp set up with a LM567 tone
decoder. Not being a designer, I am not sure how wide you could make the bandpass.

DE KX5G
"CW - The Original Digital Mode"

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From Newsgroup: alt.ham-radio.morse

Bobby Wrote: "There are a number of stand alone small devices with
electronic displays
that decode receive audio and display Morse code as scrolling text
across
the display. They don't offer the opportunity to personally acquire
the
skill to read Morse code in terms of dots and dashes, but from a
practical
standpoint could be of use to the deaf to see what's being said in
morse
code. They might even be useful for leaning the code in conjunction
with a
blinking light or vibrator output for morse code. One is the MFJ-461
Pocket
Morse Code / CW Reader, but there are other similar devices on the
market
too. I think they're all under about $200. I don't have experience
with
them to know which one works best. "

The MFJ unit has an led that lights up in time to the code to assist
with tuning to get the right level and frequency (it is very touchy).
It doesn't really copy code all that well, though and the light never
seems to work as well as the demos

However, my FT-897 has a light that flashes in time with the CW, and it
works very well, especally if you get the bandpass DSP filter tweaked
just right. It seems to to a great job on CW as well, with a built in electronic keyer and the above mentioned DSP to pull out the signal.

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From Newsgroup: alt.ham-radio.morse

On Sun, 19 Mar 2006 01:03:17 -0600, Chris W <1qazse4@cox.net> wrote:

I have heard about a device that will flash lights or vibrate some kind
of a device for operators that can't hear the tones. I have searched
google and as of yet can not find such a device that can be hooked to a >standard HF radio and then used by a deaf person to receive Morse code. >Does anyone know where you can get one or how to build one that is
reliable and works reasonably well with weak signals?

Why not just parallel the speaker with an audio isolating transformer
and hook the output of the xformer to a LED? A friend uses that to
tell him which speaker (of the 20 above the desk) has an output. Works
quite well.

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From Newsgroup: alt.ham-radio.morse

In <fn43225nlrq5s6tdi7d8ib4m58dnjiddrf@4ax.com> Charlie S. <wfivecds@NOTaol.com> writes:

Why not just parallel the speaker with an audio isolating transformer
and hook the output of the xformer to a LED? A friend uses that to
tell him which speaker (of the 20 above the desk) has an output. Works
quite well.

Visual Morse is dead slow compared with tactile and even more so
aural Morse. Ask former R/Os who occasionally had to use Aldis lamps.

73, Eddi ._._.
--
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If replying to a Usenet article, please use above e-mail address.
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