[App_rpt-users] Quick sound fob question

[Steve Zingman]

Parts count
economy of scale (mass production)
Features

I'm not saying anything good or bad about the price of a URI type device.
When I built the URI clone on repeater builder, cost was about $20.

73, Steve N4IRS

On 10/13/2015 8:44 AM, Skyler F 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 
> <mailto: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
>>     <mailto: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
>>>>     <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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>>>
>
>
>
>
> -- 
> Skyler Fennell
> amsatnet.info <http://amsatnet.info>
> KDØWHB
> electricity440 at gmail.com <mailto:electricity440 at gmail.com>

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