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Where do you want to switch it to?<br>
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<div class="moz-cite-prefix">On 10/13/2015 8:08 AM, Skyler Fennell
wrote:<br>
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<div>Ok, I'll just solder the pin, just making sure. </div>
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<div>It's weird you can't switch the gpio pin for PTT in software.</div>
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<div>On Oct 12, 2015, at 11:54 PM, larry <<a
moz-do-not-send="true" href="mailto:larry@n7fm.com"><a class="moz-txt-link-abbreviated" href="mailto:larry@n7fm.com">larry@n7fm.com</a></a>>
wrote:<br>
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<div class="moz-cite-prefix">Skyler, Short answer is No!<br>
<br>
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.<br>
<br>
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<br>
<br>
The Green LED is still the heartbeat indicator. <br>
The Red Led on the Fob is <b>NOT</b> the same as the PTT
LED indicated on the modification schematic.<br>
<br>
In fact if you go here <a moz-do-not-send="true"
class="moz-txt-link-freetext"
href="http://www.crompton.com/hamradio/usb_fob_modification/">http://www.crompton.com/hamradio/usb_fob_modification/</a><br>
<br>
You will find a good description of the connections on that
particular fob.<br>
<br>
Larry - N7FM<br>
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On 10/12/2015 06:23 PM, Skyler Fennell wrote:<br>
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<pre wrap="">I previously got the CM108 sound fob from startech and had to solder to the tiny pin.
With this one
<a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://ebay.com/itm/291156304476?_mwBanner=1&varId=590306532025">http://ebay.com/itm/291156304476?_mwBanner=1&varId=590306532025</a>
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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