[ICOM] Opto-Isolators (Was Computer Control Interface)

[W7RY]

I was also going to possibly use a reed relay as well.

73
Jim


-----Original Message-----
From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net]
On Behalf Of Larry Winslow
Sent: Wednesday, December 28, 2005 4:31 PM
To: ICOM Reflector
Subject: RE: [ICOM] Opto-Isolators (Was Computer Control Interface)

Jim,

Go with the ultimate isolation. Before I started 
using the 2n2222, I had a small reed-relay driven 
directly from the DB-9 port on my computer thru a diode. It worked
great.

73 - Larry WØNFU
larry_w at comcast.net



At 03:08 PM 12/28/2005, you wrote:
>Thanks Larry.
>
>I wanted to keep the computer and rig isolated thus the opto isolators
>and transformers for the sound card.
>
>I may attempt to drive a keying transistor with the opto-isolator.
>
>73
>Jim W7RY
>
>
>-----Original Message-----
>From: icom-bounces at mailman.qth.net
[mailto:icom-bounces at mailman.qth.net]
>On Behalf Of Larry Winslow
>Sent: Wednesday, December 28, 2005 2:45 PM
>To: ICOM Reflector
>Subject: Re: [ICOM] Opto-Isolators (Was Computer Control Interface)
>
>Jim,
>
>You'll definitely have to drive the 765 key input
>with a transistor. I struggled laboriously for
>several days trying to get an opto-isolator to
>work with my 765. I finally removed the
>opto-isolator and drove a 2n2222 transistor thru
>a 4.7k resistor - that has worked ever since.
>
>73 - Larry WØNFU
>larry_w at comcast.net
>
>At 02:30 PM 12/28/2005, you wrote:
> >Speaking of opto-isolators...
> >
> >I'm having a difficulty keying the key (on the straight key input) of
>my
> >Icom 765.  The opto-isolator worked just fine with the 1000MP but not
> >with the 765. I may have to install another transistor after the
> >opto-isolator.
> >
> >Just food for thought.
> >
> >73
> >
> >Jim W7RY
> >
> >
> >-----Original Message-----
> >From: icom-bounces at mailman.qth.net
>[mailto:icom-bounces at mailman.qth.net]
> >On Behalf Of Gary Fiber
> >Sent: Wednesday, December 28, 2005 8:12 AM
> >To: ICOM Reflector
> >Subject: RE: [ICOM] Computer Control Interface
> >
> >Well when I was working at Icom the easiest way to provide a hard
> >ground was to use a transistor externally, no mods required to the
> >equipment controlling the rig. We could not suggest to the customer
> >how to modify his after market equipment to make it work with Icom
> >products.
> >
> >I looked at a HM-14 schematic, when you place a hard ground the U/D
> >connection rig tunes up in frequency, when you ground through a 470
> >OHM resistor the rig tunes down. I was remembering the troubles I
> >went through with a customer and his DSP-2232 and using the Opto
> >isolator to drive a transistor was easiest at the time. Some programs
> >would control the frequency up / down mode in the DSP-2232. Others
> >would use an external antenna, radio frequency controller.
> >
> >When I saw the schematic of the MFJ-1289 I assumed Bob might be
> >experiencing the same issue since the manual reads use the CW out for
> >FSK keying. I did not get into it to far though.
> >I am using a Rig Blaster No Mic and just picked up a Tigertronics
> >Signalink SL-1+ for my IC-718.
> >
> >Buxcomm has a huge site I was hoping to find the product Bob was
> >using and have a look at the schematic to find any differences in the
> >FSK Keying as that unit seems to work for him.
> >
> > >If you are using an opto to do CW keying via the UP/DOWN function,
> > >then you should be aware that the UP/DOWN sensing in the Icom is
> > >done by voltage.  That is, it senses the voltage on the UP/DOWN
> > >line.   The UP/DOWN line is also used for the 4 voice/CW memory
> > >keying but in that case, it senses 4 voltages
> >
> >What Icom rig uses the U/D line for Voice and CW memory keying? Must
> >be the newer models as the older one didn't so far as I remember.
> >
> >Gary K8IZ
> >
> > >.  What this means is, if you are using a transistor to key that
> > >line, whether it is the output of an opto or discrete transistor,
> > >you have to account for the Vcesat of the transistor in presenting
> > >the line with a voltage.  The UP/DOWN buttons have no voltage
across
> > >them when they are on.  The Vce sat could be several tenths of a
> > >volt.  If you do the calculations, understanding the internal
series
> > >resistance that is in the radio and the unloaded voltage, you can
> > >come up with 4 new values of resistance for the keyer and probably
a
> > >new value for the UP/DOWN.  I have done that for the keyer with
> > >great success.  The only catch with the UP/DOWN, is that it only
> > >uses one resistance, with the other state grounding the line.  This
> > >may present a problem if the voltage detection is looking for
> > >something less that the saturation voltage of the transistor.  I
> > >have not done an UP/DOWN keyer, so I can't say whether it will work
> > >or not, but I have done computer controlled interfaces using the
> > >memory keyer with optos/transistors.
> > >
> > >
> > >At 12/27/2005 12:42 PM, you wrote:
> > > >Bob,
> > > >
> > > >I was looking at the MFJ-1279 schematic and the CW out is using a
> > > Opto Isolator. In the past I remember an Opto isolator not being
> > > able to place a hard enough ground on the Icom UP / Down input.
> > > >The AEA DSP-2232 users had to install a transistor to provide
hard
> > > enough ground so the DSP-2232 would cause a frequency change,
> > > mostly to the IC-970. This was done for Doppler shift frequency
> >tracking.
> > > >I looked at the Buxcomm site but he has some much stuff it would
> > > take a week to find the product you are using listed.
> > > >
> > > >Gary K8IZ
> > > >
> > > >At 07:58 AM 12/27/2005, you wrote:
> > > >>Ok I give up on this little project, it is quickly
> > > >>becoming not worth my time.
> > > >>
> > > >>Is someone using an interface with an Icom PRO or II or
> > > >>III that does all the soundcard modes and FSK modes along
> > > >>with keying CW from A SINGLE COMM PORT that actually
> > > >>works?
> > > >>
> > > >>I would like to know what your using so I can look into
> > > >>getting one.
> > > >>
> > > >>What is recommended by you guys with the experience?
> > > >>
> > > >>
> > > >>
> > > >>  73 fer nw,
> > > >>Bob AD5VJ
> > > >
> > > >----
> > > >Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
> > > >Icom Users Net: Sundays, 1700Z, 14.316 MHz
> > > >Icom FAQ: http://www.qsl.net/icom/
> > >
> > >----
> > >Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
> > >Icom Users Net: Sundays, 1700Z, 14.316 MHz
> > >Icom FAQ: http://www.qsl.net/icom/
> >
> >Gary Fiber K8IZ
> >GROL PG-19-6691
> >Washington State Resident
> >
> >
> >----
> >Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
> >Icom Users Net: Sundays, 1700Z, 14.316 MHz
> >Icom FAQ: http://www.qsl.net/icom/
> >
> >----
> >Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
> >Icom Users Net: Sundays, 1700Z, 14.316 MHz
> >Icom FAQ: http://www.qsl.net/icom/
>
>----
>Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
>Icom Users Net: Sundays, 1700Z, 14.316 MHz
>Icom FAQ: http://www.qsl.net/icom/
>
>
>----
>Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
>Icom Users Net: Sundays, 1700Z, 14.316 MHz
>Icom FAQ: http://www.qsl.net/icom/

----
Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
Icom Users Net: Sundays, 1700Z, 14.316 MHz
Icom FAQ: http://www.qsl.net/icom/