[arm-allstar] Unpotted USB audio FOBs --- THEY WORK!!

[Jim Korenz]

Hi All,
    I bought 5 of these FOBs also. I had a couple of days this week to mod one. I have a link radio working with the DMK URI, so I haywired my FOB to a DB25F connector to match my current setup. Everything works like it should, PTT, COS. I had to add a resistive divider to get the TX audio in range. But, bottom line, everything sounds good. I used 1N4148 signal diodes in the COS and CTCSS lines instead of the schottky diodes, and I used a 2N7002 FET for the PTT. (I used it because it didn't need the 10K resistor.) The logic signal from the CM108 is 2V, but the FET keys up my TK805 just fine. Thanks for the heads up on the USB audio FOBs. Now all I have to do is upgrade to the new BBB release :-)
   JimK N8PXW

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On Sun, 10/19/14, larry <larry at n7fm.com> wrote:

 Subject: Re: [arm-allstar] Unpotted USB audio FOBs --- bought some
 To: arm-allstar at hamvoip.org
 Date: Sunday, October 19, 2014, 3:38 AM
 
 
     Just for
 info....
 
       
 
       Bought 5 fobs from Pats ebay link below. They arrived
 2 days ahead
       of schedule delivery date. Shipping was very fast.
 
       
 
       Fobs are all CM-108 chips and as Pat indicated no
 potting.  All
       detected fine when plugged in but they haven't
 been put to actual
       use yet.
 
       
 
       Larry - N7FM
 
       
 
       
 
       On 10/14/2014 04:31 PM, Pat wrote:
 
     
     
       I ordered one of these a few weeks ago to see what
         it looked like and if it really had the proper chip
 set.
 
         
 
         I found that it was very easy to open it up to check
 on the
         circuit configuration, just pulls apart.  It has
 the correct IC
         and no potting.
 
         
 
         I followed up with a larger order.  This particular
 auction is
         set up to allow for various quantities to be
 ordered, with the
         per unit price reflecting the larger quantity.
 
         
 
         The unit price is $3.48 with free shipping.
 
         
 
         I haven't run one of them with Asterisk yet, but
 it talks to my
         Lubuntu desktop and IDs properly.
 
         
 
         The auction title is: "Wholesale USB
 External 7.1
       Channel 3D Virtual Audio Sound Card Adapter PC
 Laptop" 
 
         
 
         http://www.ebay.com/itm/291156304476?_trksid=p2060778.m1438.l2649&var=590306532024&ssPageName=STRK%3AMEBIDX%3AIT
 
         
 
         
 
         The company running the auction is:  http://stores.ebay.com/BargainCableUSA?_trksid=p2047675.l2563
 
         
 
         
 
         Pat Snyder
 
         K4PAT
 
         
 
        
 
       
       
 
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