[App_rpt-users] Quick sound fob question

[Skyler F]

Oh. Well thanks for the replies. I don't see how the URI is 25 times more
expensive than the sound fob.

On Tue, Oct 13, 2015 at 6:36 AM, Steve Zingman <szingman at msgstor.com> wrote:

> That is the Mute LED. If you mute the CM108 there may be no audio.
>
>
> On 10/13/2015 8:25 AM, Skyler Fennell wrote:
>
> To the pin with the red LED
>
> On Oct 13, 2015, at 6:23 AM, Steve Zingman < <szingman at msgstor.com>
> szingman at msgstor.com> wrote:
>
> Where do you want to switch it to?
>
> On 10/13/2015 8:08 AM, Skyler Fennell wrote:
>
> Ok, I'll just solder the pin, just making sure.
>
> It's weird you can't switch the gpio pin for PTT in software.
>
> On Oct 12, 2015, at 11:54 PM, larry < <larry at n7fm.com>larry at n7fm.com>
> wrote:
>
> Skyler,   Short answer is No!
>
> My experience with the sound fobs that look similar to yours , You will
> still need to solder to Pin 13 to get the PTT logic. No way around that as
> on the CM-108 chip Pin 13 is not connected to anything so no place else to
> get that logic other than soldering a wire to the pin.
>
> As for the COS signal (CM-108 Pin 48) that can be gotten from the left
> side of the volume down switch SW1 if you want to avoid soldering the COS
> line to Pin 48 on the sound chip. CTCSS can be retrieved from the right
> side of volume up SW2
>
> The Green LED is still the heartbeat indicator.
> The Red Led on the Fob is *NOT* the same as the PTT LED indicated on the
> modification schematic.
>
> In fact if you go here
> http://www.crompton.com/hamradio/usb_fob_modification/
>
> You will find a good description of the connections on that particular fob.
>
> Larry - N7FM
>
>
>
> On 10/12/2015 06:23 PM, Skyler Fennell wrote:
>
> I previously got the CM108 sound fob from startech and had to solder to the tiny pin.
>
> With this one
> http://ebay.com/itm/291156304476?_mwBanner=1&varId=590306532025
>
> It looks like it already has both LED's installed. I am assuming the red led is the same as the transmit LED.
>
> If this is so, does that mean I don't have to solder to the tiny pin on the CM108 and I can just drive a transistor with the same wire as the LED for PTT?
>
> Skyler KD0WHB
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-- 
Skyler Fennell
amsatnet.info
KDØWHB
electricity440 at gmail.com
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