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[aprssig] Looking for an EJ41U TNC

Scott Miller scott at opentrac.org
Sun Dec 17 00:34:15 UTC 2006


Sounds good - I'll contact you off-list with details, thanks!

Scott
N1VG 

> -----Original Message-----
> From: aprssig-bounces at lists.tapr.org 
> [mailto:aprssig-bounces at lists.tapr.org] On Behalf Of Joel Maslak
> Sent: Saturday, December 16, 2006 4:30 PM
> To: TAPR APRS Mailing List
> Subject: Re: [aprssig] Looking for an EJ41U TNC
> 
> 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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> > aprssig at lists.tapr.org
> > https://lists.tapr.org/cgi-bin/mailman/listinfo/aprssig
> 
> 
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