[App_rpt-users] Cheap USB Fobs

Ken ke2n at cs.com
Wed Sep 29 10:06:51 EDT 2010


Yes ... it took at >month for me to get mine and even though the package has
CM-108 written right on it, the chip is identified by Linux as JMTek (HY559
chip I think).  I sent an e-mail expressing my disappointment (which was
un-acknowledged by Dealextreme).

I found if you modify the vendor codes in usb_radio.c so that the program
thinks this JMTek is actually a C-Media unit, it will scan the fob and read
audio.  It will not turn the red light on for transmit though ... which is
immaterial anyway, since you cannot get at the wire you need inside the
'blob' to use for PTT.  I think it could be used for my weather radio
application, but the software changes would be a  bit tricky (for me) making
some if/and/or logic more complicated - getting the arrangement of left and
right parenthesis correct eluded on the first try.  

I have one other source on the way now, which would be the preferable
solution (no software mod needed). But I will not be surprised if it turns
out to have the wrong chip.

Ken

Buyer beware, as usual.
www.dinodirect.com/sound-card-adapter-usb-cm108-chipset.html?ddse=CM-108



> -----Original Message-----
> From: app_rpt-users-bounces at qrvc.com [mailto:app_rpt-users-
> bounces at qrvc.com] On Behalf Of Yokshs
> Sent: Wednesday, September 29, 2010 9:43 AM
> To: app_rpt-users at qrvc.com
> Subject: Re: [App_rpt-users] Cheap USB Fobs
> 
> 
> I received my CM108 fobs yesterday. I ordered them from:
> http://www.dealextreme.com/details.dx/sku.21812
> 
> I haven't had much time to play with them yet, but the IC is a "blob"
> much
> like the cheapo Ebay fobs.
> 
> Has anybody had the same problem?
> 
> 73.
> 
> Kyle
> K0KN
> 
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> App_rpt-users at qrvc.com
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