[App_rpt-users] Quick sound fob question

[Steve Zingman]

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 
> <mailto: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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>>
>
>
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