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[aprssig] Looking for an EJ41U TNC

Joel Maslak jmaslak-aprs at antelope.net
Sun Dec 17 00:29:31 UTC 2006


Sure, I have one in my IGate that is currently unplugged while a TNC- 
X does the job the EJ-41U is supposed to do.  I'm willing to send it  
Monday and wait until whenever you feel like it for a T2-135 - I've  
got a working system now, so I'm in no hurry.

On Dec 16, 2006, at 2:09 PM, Scott Miller wrote:

> Anyone want to trade an Alinco EJ-41U TNC (the internal type for the
> DR-135T) for a working but pre-production prototype T2-135?  It's a  
> Tracker2
> board designed as a drop-in replacement for the EJ-41U.  Its APRS  
> support is
> way better (SmartBeaconing, digipeating, waypoint output, weather  
> station
> support, etc) and unlike the EJ-41U it has flash-based  
> configuration memory
> and won't lose its config every other time you turn it on.   
> Retention should
> be at least 10 years from the time the last config command is  
> entered, in
> fact.
>
> The KISS buffers are small, but adequate for APRS, and it won't  
> lock up or
> otherwise freak out if you do overrun the buffers.  There's no  
> connected
> mode support (remote commands are via APRS messages) and no 9600 baud
> operation, but aside from that it should outperform the EJ-41U in  
> just about
> every way.  Decode rate on the tested prototypes has been better  
> than the
> TNC2 clones I've tested against.
>
> Oh, one other difference - the T2-135 has a pre-emphasis filter on the
> transmit side.  The EJ-41U (like the D700) transmits flat, which is  
> bad if
> you're applying de-emphasis on the RX side.  In the future this will
> probably be selectable by jumper, but for now it's hardwired.
>
> I need an EJ-41U to do some head-to-head performance tests, but  
> they're
> getting a little scarce and they seem to be backordered most  
> places.  It
> might be a couple of weeks before I can have a T2-135 unit ready in  
> exchange
> (I'm waiting for parts now) but I might be able to have one ready  
> sooner if
> an alternate source for the connectors works out.
>
> Thanks,
>
> Scott
> N1VG
>
>
>
>
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