[digitalradio] Microphone putting audio into PSK transmissions

[Dave]

I'm using the ACC jack on the rear of my IC-746 for digital mode audio 
from my computer. Convenient, but the downside is that the microphone 
picks up audio from the room and that also gets transmitted. For this 
reason I'm considering building a mic switch box that will allow me to 
switch the mic out of the circuit without having to remove it from the 
front connector on the rig every time I use a digital mode.

My question is, can I simply use a rotary wafer switch with eight 
contacts to switch between no microphone, my headset, and my hand mic? 
Would there be a need for any electronics at all?

An even bigger question is, might there be a simpler way to kill the 
audio from the microphone without going through all this?

All input appreciated!
Tnx es 73
Dave
KB3MOW

RE: [digitalradio] Microphone putting audio into PSK transmissions

[W2ZEY]

Dave,

I use PSK on a 756 Pro 3, and if I remember correctly the back panel of the 746 
is more or less the same.  I assume you are using
ACC 1, correct?  What are you using for a sound card interface to the computer?

 

I could be mistaken but my understanding is that if the interface is configured 
correctly for ACC 1, the mike should not pick up
audio.  For example, I use the SL-USB with the 756 via ACC 1 and the mike is 
muted - no audio pick up whatsoever.   Let me know what
your set up is.

 

73 Larry / W2ZEY

 

  _  

From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Dave
Sent: Monday, June 16, 2008 11:47 AM
To: digitalradio@yahoogroups.com
Subject: [digitalradio] Microphone putting audio into PSK transmissions

 

I'm using the ACC jack on the rear of my IC-746 for digital mode audio 
from my computer. Convenient, but the downside is that the microphone 
picks up audio from the room and that also gets transmitted. For this 
reason I'm considering building a mic switch box that will allow me to 
switch the mic out of the circuit without having to remove it from the 
front connector on the rig every time I use a digital mode.

My question is, can I simply use a rotary wafer switch with eight 
contacts to switch between no microphone, my headset, and my hand mic? 
Would there be a need for any electronics at all?

An even bigger question is, might there be a simpler way to kill the 
audio from the microphone without going through all this?

All input appreciated!
Tnx es 73
Dave
KB3MOW 

RE: [digitalradio] Microphone putting audio into PSK transmissions

[dcorio]

Hi, Larry. I'm using a Buxcomm interface, and yes, it is ACC-1 I'm
connected to. I've never had any complaints about my digital signals, and
in fact wouldn't have even realized that the mic was active until one day
I moved the mic and saw the output meter on the 746 deflect when I set it
down!

I know probably the easiest way to eliminate the audio would be with a
simple SPDT switch in the audio line of the mic, but I figured I could
make a switchbox that would allow me to change from headset to hand mic
(or no mic!), and perhaps also switch between a couple of speaker setups.

I was just hoping to find a quicker and easier method hi! I seem to recall
someone on the Icom IC-746 group stating that the older 746's were known
to have this problem.

Tnx es 73
Dave KB3MOW


> Dave,
>
> I use PSK on a 756 Pro 3, and if I remember correctly the back panel of
> the 746 is more or less the same.  I assume you are using
> ACC 1, correct?  What are you using for a sound card interface to the
> computer?
>
>
>
> I could be mistaken but my understanding is that if the interface is
> configured correctly for ACC 1, the mike should not pick up
> audio.  For example, I use the SL-USB with the 756 via ACC 1 and the mike
> is muted - no audio pick up whatsoever.   Let me know what
> your set up is.
>
>
>
> 73 Larry / W2ZEY
>
>
>
>   _
>
> From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED]
> On Behalf Of Dave
> Sent: Monday, June 16, 2008 11:47 AM
> To: digitalradio@yahoogroups.com
> Subject: [digitalradio] Microphone putting audio into PSK transmissions
>
>
>
> I'm using the ACC jack on the rear of my IC-746 for digital mode audio
> from my computer. Convenient, but the downside is that the microphone
> picks up audio from the room and that also gets transmitted. For this
> reason I'm considering building a mic switch box that will allow me to
> switch the mic out of the circuit without having to remove it from the
> front connector on the rig every time I use a digital mode.
>
> My question is, can I simply use a rotary wafer switch with eight
> contacts to switch between no microphone, my headset, and my hand mic?
> Would there be a need for any electronics at all?
>
> An even bigger question is, might there be a simpler way to kill the
> audio from the microphone without going through all this?
>
> All input appreciated!
> Tnx es 73
> Dave
> KB3MOW
>
>

RE: [digitalradio] Microphone putting audio into PSK transmissions

[W2ZEY]

Because you use a hand mike, a headset, and different speakers, a switch box 
would be a good project anyway.  I have not heard that
early 746s were prone to the problem you describe however I'll take your word 
for it.

 

However, the Buxcomm raised a red flag.  I know there are plenty of satisfied 
users out there but I had big problems with Rascal for
an Icom 706 M2G.  The TX would be keyed - unexpectedly when not intended. 
Turned out to be a faulty cable from Buxcomm.  That's
about the time I decided to switch to the SL-USB.

 

There are many interfaces out there that use internal jumpers to configure the 
connection to ACC 1.  I can't help but wonder if one
of these would be better.  The 746 group would know for sure.

 

73 / Larry / W2ZEY

 

  _  

From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of 
[EMAIL PROTECTED]
Sent: Monday, June 16, 2008 1:58 PM
To: digitalradio@yahoogroups.com
Subject: RE: [digitalradio] Microphone putting audio into PSK transmissions

 

Hi, Larry. I'm using a Buxcomm interface, and yes, it is ACC-1 I'm
connected to. I've never had any complaints about my digital signals, and
in fact wouldn't have even realized that the mic was active until one day
I moved the mic and saw the output meter on the 746 deflect when I set it
down!

I know probably the easiest way to eliminate the audio would be with a
simple SPDT switch in the audio line of the mic, but I figured I could
make a switchbox that would allow me to change from headset to hand mic
(or no mic!), and perhaps also switch between a couple of speaker setups.

I was just hoping to find a quicker and easier method hi! I seem to recall
someone on the Icom IC-746 group stating that the older 746's were known
to have this problem.

Tnx es 73
Dave KB3MOW

> Dave,
>
> I use PSK on a 756 Pro 3, and if I remember correctly the back panel of
> the 746 is more or less the same. I assume you are using
> ACC 1, correct? What are you using for a sound card interface to the
> computer?
>
>
>
> I could be mistaken but my understanding is that if the interface is
> configured correctly for ACC 1, the mike should not pick up
> audio. For example, I use the SL-USB with the 756 via ACC 1 and the mike
> is muted - no audio pick up whatsoever. Let me know what
> your set up is.
>
>
>
> 73 Larry / W2ZEY
>
>
>
> _
>
> From: digitalradio@  yahoogroups.com 
> [mailto:digitalradio@
 yahoogroups.com]
> On Behalf Of Dave
> Sent: Monday, June 16, 2008 11:47 AM
> To: digitalradio@  yahoogroups.com
> Subject: [digitalradio] Microphone putting audio into PSK transmissions
>
>
>
> I'm using the ACC jack on the rear of my IC-746 for digital mode audio
> from my computer. Convenient, but the downside is that the microphone
> picks up audio from the room and that also gets transmitted. For this
> reason I'm considering building a mic switch box that will allow me to
> switch the mic out of the circuit without having to remove it from the
> front connector on the rig every time I use a digital mode.
>
> My question is, can I simply use a rotary wafer switch with eight
> contacts to switch between no microphone, my headset, and my hand mic?
> Would there be a need for any electronics at all?
>
> An even bigger question is, might there be a simpler way to kill the
> audio from the microphone without going through all this?
>
> All input appreciated!
> Tnx es 73
> Dave
> KB3MOW
>
>

 

Re: [digitalradio] Microphone putting audio into PSK transmissions

[Rick W.]

Larry,

I have a 756 Pro 2, which should be identical to the Pro 3, and on all 
the diagrams for interfacing, the 746 series should also be the same. I 
know that the 746 has the ACC1. I only use the ACC1 on my Pro 3 by 
connecting to the audio in, audio out, and PTT.

I don't know the command structure of the 746, but if it does not have a 
"D" mode to turn off the mike when operating in digital modes, from 
recent comments, doesn't the 746 series have the same 6 pin mini DIN as 
the IC-7000?

My understanding is that the circuit is designed to mute the microphone 
if the PTT is activated. I suspect that some of the more expensive 
interface units use the 8 pin DIN in order to get operating voltage from 
pin 7 which is NOT available on the 6 pin mini DIN.

But you won't need this, if you are using interfaces such as the Unified 
Microsystems SCI-6 (gets enough from the serial keying line to trigger 
the optoisolator) or the Tigertronics SignalinkUSB (gets it from the USB 
side of the connection).

Bonnie's suggestion of modifying the microphone is another solution. I 
kept thinking about any pitfalls in doing that and realized later that 
her solution will disable VOX operation. This is likely why the 
manufacturers don't have it as a default. However, I doubt that many of 
us would need VOX with a handmike. That would be a nice feature to 
include in software control.

73,

Rick, KV9U



W2ZEY wrote:
>
> Dave,
>
> I use PSK on a 756 Pro 3, and if I remember correctly the back panel 
> of the 746 is more or less the same. I assume you are using ACC 1, 
> correct? What are you using for a sound card interface to the computer?
>
> I could be mistaken but my understanding is that if the interface is 
> configured correctly for ACC 1, the mike should not pick up audio. For 
> example, I use the SL-USB with the 756 via ACC 1 and the mike is muted 
> – no audio pick up whatsoever. Let me know what your set up is.
>
> 73 Larry / W2ZEY
>
>
> 




Announce your digital presence via our Interactive Sked Page at
http://www.obriensweb.com/sked

Check our other Yahoo Groups
http://groups.yahoo.com/group/dxlist/
http://groups.yahoo.com/group/contesting
http://groups.yahoo.com/group/themixwgroup
Yahoo! Groups Links

<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/digitalradio/

<*> Your email settings:
Individual Email | Traditional

<*> To change settings online go to:
http://groups.yahoo.com/group/digitalradio/join
(Yahoo! ID required)

<*> To change settings via email:
mailto:[EMAIL PROTECTED] 
mailto:[EMAIL PROTECTED]

<*> To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]

<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/

RE: [digitalradio] Microphone putting audio into PSK transmissions

[dcorio]

I'd be real careful taking my word for things, Larry - I can't even
remember breakfast this morning hi hi!

Haven't had any problems with the Buxcomm in the 6 months or so that I've
used it. Had to return the first one I bought as defective, but he
replaced it real quick and this one has been fine. Since it feeds the PC
audio to ACC-1 I don't beleive it could be causing the microphone to
activate, but that's why I ask these questions hi!

I'm thinking of using two input jacks on this project - one for the
headset mic and one for the hand mic. One output would feed the mic jack
on the 746, and a 8-pole, 3-position rotary switch would select between
either mic, or "none" when I'm on digital. That would switch the mic audio
right out of the circuit. Just need to find out if that will do it for me.

Tnx es 73
Dave KB3MOW


> Because you use a hand mike, a headset, and different speakers, a switch
> box would be a good project anyway.  I have not heard that
> early 746s were prone to the problem you describe however I'll take your
> word for it.
>
>
>
> However, the Buxcomm raised a red flag.  I know there are plenty of
> satisfied users out there but I had big problems with Rascal for
> an Icom 706 M2G.  The TX would be keyed - unexpectedly when not intended.
> Turned out to be a faulty cable from Buxcomm.  That's
> about the time I decided to switch to the SL-USB.
>
>
>
> There are many interfaces out there that use internal jumpers to configure
> the connection to ACC 1.  I can't help but wonder if one
> of these would be better.  The 746 group would know for sure.
>
>
>
> 73 / Larry / W2ZEY
>
>
>
>   _
>
>

[digitalradio] newbie wanting to make first packet contact

[wizhippo]

I love digital modes.  I have worked psk31, rtty, sstv etc but never
packet.

I have installed awgpe and UISS and have it working from what I can
tell.  I can monitor the packets.

Now I want to make contact.  I have read lots of articles on the net
but none that have been clear enough or modern enough to get me a contact.

I would love an example of how to go about making a qso or connecting
to a BBS or doing email.

If there is anyone willing to help me out that would be great. 
Unfortuanlty no one in our local club does any packet work to help.

[digitalradio] Icom HM-36 Mic Mute Mod for Icom Transceivers IC-718, IC-746, etc

[expeditionradio]

This modification to the Icom HM-36 microphone 
results in the muting of the microphone 
whenever the rear panel data jack is in use.

CLICK HERE TO VIEW THE MOD:
http://hflink.com/icom/microphone/hm36/

73 Bonnie VR2/KQ6XA

Re: [digitalradio] newbie wanting to make first packet contact

[Jeff Moore]

>From the info you provided, it's kinda hard to tell exactly what it is you 
>want to do.

Do you want to try 2m packet?  HF packet?  Satellite Packet?

Who you are and where you are would be helpful also.

Jeff  --  KE7ACY
CN94ib

- Original Message - 
From: wizhippo 


I love digital modes. I have worked psk31, rtty, sstv etc but never
packet.

I have installed awgpe and UISS and have it working from what I can
tell. I can monitor the packets.

Now I want to make contact. I have read lots of articles on the net
but none that have been clear enough or modern enough to get me a contact.

I would love an example of how to go about making a qso or connecting
to a BBS or doing email.

If there is anyone willing to help me out that would be great. 
Unfortuanlty no one in our local club does any packet work to help.



 

[digitalradio] Re: Microphone putting audio into PSK transmissions

[expeditionradio]

Hi Dave,

Many transceivers have automatic
muting of the microphone whenever the rear
panel accessory jack PTT is in use...
and they do not require external switching
or modification.

However, some Icom transceivers and other 
brands do not have internal muting of the
microphone muting when the rear panel 
audio/PTT is enabled.

A simple modification of the Icom HM-36 microphone
results in the muting of the microphone
whenever the microphone's PTT button is
not being pushed. It enables the computer
to interface via the transceiver's
rear panel data accessory jack, without
ambient audio entering via the hot microphone
during computer audio transmissions.

CLICK HERE TO VIEW THE MOD:
http://hflink.com/icom/microphone/hm36/

This mod provides an easy viable solution
that does not require modification of the
transceiver itself.

The principles used in this modification
may be applied to other brands of transceivers
and microphones.

73 Bonnie VR2/KQ6XA

> Dave KB3MOW wrote:
> I'm using the ACC jack on the rear of my IC-746 for 
> digital mode audio from my computer. Convenient, 
> but the downside is that the microphone 
> picks up audio from the room and that also gets 
> transmitted. 
> ... might there be a simpler way to kill the 
> audio from the microphone without going through all this?  

[digitalradio] Re: newbie wanting to make first packet contact

[wizhippo]

Thank you for the reply.

I am trying 2m packet but I have an antenna and radio that will do HF
also.

After doing 2m I plan on trying some sat work in a week or two when I
finish my cheap yagi for sat work.


--- In digitalradio@yahoogroups.com, "Jeff Moore" <[EMAIL PROTECTED]> wrote:
>
> From the info you provided, it's kinda hard to tell exactly what it
is you want to do.
> 
> Do you want to try 2m packet?  HF packet?  Satellite Packet?
> 
> Who you are and where you are would be helpful also.
> 
> Jeff  --  KE7ACY
> CN94ib
> 
> - Original Message - 
> From: wizhippo 
> 
> 
> I love digital modes. I have worked psk31, rtty, sstv etc but never
> packet.
> 
> I have installed awgpe and UISS and have it working from what I can
> tell. I can monitor the packets.
> 
> Now I want to make contact. I have read lots of articles on the net
> but none that have been clear enough or modern enough to get me a
contact.
> 
> I would love an example of how to go about making a qso or connecting
> to a BBS or doing email.
> 
> If there is anyone willing to help me out that would be great. 
> Unfortuanlty no one in our local club does any packet work to help.
>

[digitalradio] Re: newbie wanting to make first packet contact

[wizhippo]

Sorry i should have added this.

I am VA3DJX Doug, located in Brantford, Ontario

--- In digitalradio@yahoogroups.com, "Jeff Moore" <[EMAIL PROTECTED]> wrote:
>
> From the info you provided, it's kinda hard to tell exactly what it
is you want to do.
> 
> Do you want to try 2m packet?  HF packet?  Satellite Packet?
> 
> Who you are and where you are would be helpful also.
> 
> Jeff  --  KE7ACY
> CN94ib
> 
> - Original Message - 
> From: wizhippo 
> 
> 
> I love digital modes. I have worked psk31, rtty, sstv etc but never
> packet.
> 
> I have installed awgpe and UISS and have it working from what I can
> tell. I can monitor the packets.
> 
> Now I want to make contact. I have read lots of articles on the net
> but none that have been clear enough or modern enough to get me a
contact.
> 
> I would love an example of how to go about making a qso or connecting
> to a BBS or doing email.
> 
> If there is anyone willing to help me out that would be great. 
> Unfortuanlty no one in our local club does any packet work to help.
>

Re: [digitalradio] Re: Microphone putting audio into PSK transmissions

[Dave 'Doc' Corio]

Thanks, Bonnie. While I'm sure that would solve the problem with the 
hand-held, it only addresses half the issue. When the XYL is in the 
shack (her computer desk is 90 degrees and 4 feet away from mine) I use 
the headset mic so as to cause as little QRM to her while she works (she 
works from home). I guess unless someone tells me that a rotary wafer 
switch won't do the trick for me, I'm going to try to build one.

Tnx es 73
Dave KB3MOW


expeditionradio wrote:
>
> Hi Dave,
>
> Many transceivers have automatic
> muting of the microphone whenever the rear
> panel accessory jack PTT is in use...
> and they do not require external switching
> or modification.
>
> However, some Icom transceivers and other
> brands do not have internal muting of the
> microphone muting when the rear panel
> audio/PTT is enabled.
>
> A simple modification of the Icom HM-36 microphone
> results in the muting of the microphone
> whenever the microphone's PTT button is
> not being pushed. It enables the computer
> to interface via the transceiver's
> rear panel data accessory jack, without
> ambient audio entering via the hot microphone
> during computer audio transmissions.
>
> CLICK HERE TO VIEW THE MOD:
> http://hflink.com/icom/microphone/hm36/ 
> 
>
> This mod provides an easy viable solution
> that does not require modification of the
> transceiver itself.
>
> The principles used in this modification
> may be applied to other brands of transceivers
> and microphones.
>
> 73 Bonnie VR2/KQ6XA
>
> > Dave KB3MOW wrote:
> > I'm using the ACC jack on the rear of my IC-746 for
> > digital mode audio from my computer. Convenient,
> > but the downside is that the microphone
> > picks up audio from the room and that also gets
> > transmitted.
> > ... might there be a simpler way to kill the
> > audio from the microphone without going through all this?
>
>  

[digitalradio] Re: Microphone putting audio into PSK transmissions

[expeditionradio]

To mute the mic audio, you only need to short the microphone hot pin
to ground. A simple single pole single throw switch (normally open)
will work. However, you will need to manually switch it each time you
transmit... and perhaps that is  rather sloppy station control. 

Bonnie

--- In digitalradio@yahoogroups.com, Dave 'Doc' Corio <[EMAIL PROTECTED]> wrote:
> I guess unless someone tells me that a rotary wafer 
> switch won't do the trick for me, I'm going to try to build one.
> 
> Tnx es 73
> Dave KB3MOW
>  
> > CLICK HERE TO VIEW THE MOD:
> > http://hflink.com/icom/microphone/hm36/  

Re: [digitalradio] Re: Microphone putting audio into PSK transmissions

[Dave 'Doc' Corio]

Well, my plan is to use two 8-pin mic jacks on a small enclosure, 
with an 8-wire line out to the mic input of the 746. A rotary wafer 
switch with 8 poles and three positions should allow me to switch 
between the hand-held mic, the headset mic, or a blank position 
coresponding to "no mic". When I'm going to run digital modes, I'd 
simply select the "no mic" position so that room audio doesn't get 
transmitted. In either of the other two positions, for SSB operation, 
all pins would be active on the selected mic, and PTT, audio, and 
controls should be functional. I don't see that as being sloppy at all.

Tnx es 73
Dave KB3MOW


expeditionradio wrote:
>
> To mute the mic audio, you only need to short the microphone hot pin
> to ground. A simple single pole single throw switch (normally open)
> will work. However, you will need to manually switch it each time you
> transmit... and perhaps that is rather sloppy station control.
>
> Bonnie
>
> --- In digitalradio@yahoogroups.com 
> , Dave 'Doc' Corio <[EMAIL PROTECTED]> 
> wrote:
> > I guess unless someone tells me that a rotary wafer
> > switch won't do the trick for me, I'm going to try to build one.
> >
> > Tnx es 73
> > Dave KB3MOW
> >
> > > CLICK HERE TO VIEW THE MOD:
> > > http://hflink.com/icom/microphone/hm36/ 
> 
>
>  

RE: [digitalradio] Microphone putting audio into PSK transmissions

[W2ZEY]

Rick,
I agree completely with you about the ACC1 connections for the 756 Pro Series.  
Your observation about the 746 ACC1 pinout confirms
my suspicion that it is not different than the 756.  

The 6 pin mini data jack on the 7000 actually has the same pinout as the 
703/706 and 746 Pro - this according to the Tigertronics
website.  Note: For certain types of connections the 7000 does have issues with 
mic muting [per Tigertronics site].

There are two things I like about the SL-USB.  It draws power from the USB 
connection and it frees up the computer's soundcard for
other duties.  In fact, I like it so much I purchased a second one for portable 
ops with an SGC 2020!

73 / Larry / W2ZEY
 
-Original Message-
From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Rick 
W.
Sent: Monday, June 16, 2008 2:29 PM
To: digitalradio@yahoogroups.com
Subject: Re: [digitalradio] Microphone putting audio into PSK transmissions

Larry,

I have a 756 Pro 2, which should be identical to the Pro 3, and on all 
the diagrams for interfacing, the 746 series should also be the same. I 
know that the 746 has the ACC1. I only use the ACC1 on my Pro 3 by 
connecting to the audio in, audio out, and PTT.

I don't know the command structure of the 746, but if it does not have a 
"D" mode to turn off the mike when operating in digital modes, from 
recent comments, doesn't the 746 series have the same 6 pin mini DIN as 
the IC-7000?

My understanding is that the circuit is designed to mute the microphone 
if the PTT is activated. I suspect that some of the more expensive 
interface units use the 8 pin DIN in order to get operating voltage from 
pin 7 which is NOT available on the 6 pin mini DIN.

But you won't need this, if you are using interfaces such as the Unified 
Microsystems SCI-6 (gets enough from the serial keying line to trigger 
the optoisolator) or the Tigertronics SignalinkUSB (gets it from the USB 
side of the connection).

Bonnie's suggestion of modifying the microphone is another solution. I 
kept thinking about any pitfalls in doing that and realized later that 
her solution will disable VOX operation. This is likely why the 
manufacturers don't have it as a default. However, I doubt that many of 
us would need VOX with a handmike. That would be a nice feature to 
include in software control.

73,

Rick, KV9U

RE: [digitalradio] Microphone putting audio into PSK transmissions

[W2ZEY]

Dave,

This is what Tigertronics says about the early 746 model:

 

"Some customers have reported that the IC-746 (early model only) does NOT mute 
the Mic when keyed from the Accy Port.  If this is
the case with your radio, then you will need to turn the radio's Mic Gain down 
and/or unplug the microphone."

 

The Mic gain on your radio is on front - not buried in a menu.  Does turning 
the gain all the way down take care of the problem?
That's a lot more convenient than unplugging the microphone and cheaper than 
building a switch box. unless you want to build a
project for fun, that is.

 

73 / Larry / W2ZEY

 

  _  

From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of 
[EMAIL PROTECTED]
Sent: Monday, June 16, 2008 2:33 PM
To: digitalradio@yahoogroups.com
Subject: RE: [digitalradio] Microphone putting audio into PSK transmissions

 

I'd be real careful taking my word for things, Larry - I can't even
remember breakfast this morning hi hi!

Haven't had any problems with the Buxcomm in the 6 months or so that I've
used it. Had to return the first one I bought as defective, but he
replaced it real quick and this one has been fine. Since it feeds the PC
audio to ACC-1 I don't beleive it could be causing the microphone to
activate, but that's why I ask these questions hi!

I'm thinking of using two input jacks on this project - one for the
headset mic and one for the hand mic. One output would feed the mic jack
on the 746, and a 8-pole, 3-position rotary switch would select between
either mic, or "none" when I'm on digital. That would switch the mic audio
right out of the circuit. Just need to find out if that will do it for me.

Tnx es 73
Dave KB3MOW

RE: [digitalradio] Re: Microphone putting audio into PSK transmissions

[Bob Donnell]

Hi Dave,

Rather than switching all eight lines (so you might be able to use a cheaper
and easier to wire switch) I'd look at which lines are used for what
purpose, and make some intellegent decisions about what you're using, and
what needs to be switched.  For example, you shouldn't need to switch any
ground connections.  You probably don't need to switch the PTT connection,
though if you key the wrong mike, (except on AM/FM) you won't get any power
output.  If you don't use the up/down functions then they don't need to be
connected.  If you can get your list of required connections down to 3 or 4,
depending on the switch, it could be a single-deck switch.  Or you may only
find a switch with 12 (or 6) positions, but the ability to put a "stop" in
the switch, to limit rotation.  That switch will have more decks, with some
(to many) terminals unused.  You'll also want to consider whether RF
suppression will be needed - such as if you use a plastic enclosure, which
(unless it's sprayed with shielding paint) will lack shielding, and could
create an RF feedback problem for you.  Just things to consider.  Unless you
like learning the hard way!  

73, Bob, KD7NM

-Original Message-
From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Dave 'Doc' Corio
Sent: Monday, June 16, 2008 2:20 PM
To: digitalradio@yahoogroups.com
Subject: Re: [digitalradio] Re: Microphone putting audio into PSK
transmissions

Well, my plan is to use two 8-pin mic jacks on a small enclosure, with
an 8-wire line out to the mic input of the 746. A rotary wafer switch with 8
poles and three positions should allow me to switch between the hand-held
mic, the headset mic, or a blank position coresponding to "no mic". When I'm
going to run digital modes, I'd simply select the "no mic" position so that
room audio doesn't get transmitted. In either of the other two positions,
for SSB operation, all pins would be active on the selected mic, and PTT,
audio, and controls should be functional. I don't see that as being sloppy
at all.

Tnx es 73
Dave KB3MOW


expeditionradio wrote:
>
> To mute the mic audio, you only need to short the microphone hot pin 
> to ground. A simple single pole single throw switch (normally open) 
> will work. However, you will need to manually switch it each time you 
> transmit... and perhaps that is rather sloppy station control.
>
> Bonnie
>
> --- In digitalradio@yahoogroups.com
> , Dave 'Doc' Corio <[EMAIL PROTECTED]>
> wrote:
> > I guess unless someone tells me that a rotary wafer switch won't do 
> > the trick for me, I'm going to try to build one.
> >
> > Tnx es 73
> > Dave KB3MOW
> >
> > > CLICK HERE TO VIEW THE MOD:
> > > http://hflink.com/icom/microphone/hm36/
> 
>
>  



Announce your digital presence via our Interactive Sked Page at
http://www.obriensweb.com/sked

Check our other Yahoo Groups
http://groups.yahoo.com/group/dxlist/
http://groups.yahoo.com/group/contesting
http://groups.yahoo.com/group/themixwgroup
Yahoo! Groups Links

Re: [digitalradio] Microphone putting audio into PSK transmissions

[Dave 'Doc' Corio]

  I recall an old saying. Something about not seeing the forest for the 
trees. Well, time to get the chain saw out and cut some wood!

Yep, the mic gain control is sitting right there on the front of the 
rig. I suspect it's probably been there all along, but obviously, I'd be 
the wrong person to say. And ya know what? When I turn that little 
control counterclockwise, well, the audio picked up by the microphone is 
no longer an issue! Durn clever of these Icom folks to put that right there!

Guess I've been controlling the gain via the software for so long that I 
never even considered the obvious solution! Now I can turn my attention 
to much more important matters - like figuring out if the little light 
in the fridge really DOES go out when I close the door!

Many thanks and 73 Larry!
Dave KB3MOW


W2ZEY wrote:
>
> Dave,
>
> This is what Tigertronics says about the early 746 model:
>
> “Some customers have reported that the IC-746 (early model only) does 
> NOT mute the Mic when keyed from the Accy Port. If this is the case 
> with your radio, then you will need to turn the radio's Mic Gain down 
> and/or unplug the microphone…”
>
> The Mic gain on your radio is on front – not buried in a menu. Does 
> turning the gain all the way down take care of the problem? That’s a 
> lot more convenient than unplugging the microphone and cheaper than 
> building a switch box… unless you want to build a project for fun, 
> that is.
>
> 73 / Larry / W2ZEY
>
> 
>
> *From:* digitalradio@yahoogroups.com 
> [mailto:[EMAIL PROTECTED] *On Behalf Of [EMAIL PROTECTED]
> *Sent:* Monday, June 16, 2008 2:33 PM
> *To:* digitalradio@yahoogroups.com
> *Subject:* RE: [digitalradio] Microphone putting audio into PSK 
> transmissions
>
> I'd be real careful taking my word for things, Larry - I can't even
> remember breakfast this morning hi hi!
>
> Haven't had any problems with the Buxcomm in the 6 months or so that I've
> used it. Had to return the first one I bought as defective, but he
> replaced it real quick and this one has been fine. Since it feeds the PC
> audio to ACC-1 I don't beleive it could be causing the microphone to
> activate, but that's why I ask these questions hi!
>
> I'm thinking of using two input jacks on this project - one for the
> headset mic and one for the hand mic. One output would feed the mic jack
> on the 746, and a 8-pole, 3-position rotary switch would select between
> either mic, or "none" when I'm on digital. That would switch the mic audio
> right out of the circuit. Just need to find out if that will do it for me.
>
> Tnx es 73
> Dave KB3MOW
>
>  



Announce your digital presence via our Interactive Sked Page at
http://www.obriensweb.com/sked

Check our other Yahoo Groups
http://groups.yahoo.com/group/dxlist/
http://groups.yahoo.com/group/contesting
http://groups.yahoo.com/group/themixwgroup
Yahoo! Groups Links

<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/digitalradio/

<*> Your email settings:
Individual Email | Traditional

<*> To change settings online go to:
http://groups.yahoo.com/group/digitalradio/join
(Yahoo! ID required)

<*> To change settings via email:
mailto:[EMAIL PROTECTED] 
mailto:[EMAIL PROTECTED]

<*> To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]

<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/