[App_rpt-users] Quick sound fob question

Tue Oct 13 13:57:53 UTC 2015

I guess that is part of being a ham and wanting to experiment and build or modify something.  When I could buy 10 for $10 and spend maybe 10 minutes to modify one, it is worth my time to save some money.  Even with buying 10 and modding them is still doesn't cost what a dmk uri cost.

To each their own but I will stick to the ham radio side of things and try it myself first!

Corey n3fe

Sent from my iPhone

> On Oct 13, 2015, at 9:28 AM, Bryan D. Boyle <bdboyle at bdboyle.com> wrote:
> 
> Why?
> 
> One is made as a generic part meant to be sold by the millions and assembled by workers making a couple cents an hour requiring time and effort on your part to modify and the other was designed to do a specific job and sold in relatively few numbers for a specific purpose.
> 
> I've never has an issue with a DMK dongle-- they just work.  Way past the thrill of spending time modifying parts to do what it wasn't designed to do to save a few bucks.  My time is worth more than $60 or $70 an hour and would rather spend it actually tweaking the system than getting it to run in the first place.
> 
> And I have no financial interest in DMK or anything else around this system.  
> --
> Bryan
> Sent from my iPhone 6S...No electrons were harmed in the sending of this message.
> 
> 
> 
>> On Oct 13, 2015, at 08:44, Skyler F <electricity440 at gmail.com> wrote:
>> 
>> 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> 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> 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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>> 
>> 
>> -- 
>> Skyler Fennell
>> amsatnet.info
>> KDØWHB
>> electricity440 at gmail.com
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