[Premium-Rx] WJ-8712 Firmware.

[paul at 8zo.com]

The latest firmware for the WJ-8712P is:

Control A2U12:  04.01.10
DSP A2U56: 04.02.07

This was in my 2002-build receiver, and when I bought the latest control board & firmware for my WJ-8711A on 2.27.2006, it was still the latest available.

With this firmware there are many selectable SSB bandwidths between 900 Hz and 4 KHz (exactly like the latest WJ-8711A).  Of course, this is for the WJ-8712P receiver variant with the front panel.  At some point, I may make a few minor firmware mods to bring that up to 8 KHz.  

Will be making copies of these EPROMS in the near future and will make them available!

Vy 73,   -Paul  W8ZO


On Feb 22, 2012, at 7:26 AM, Francesco Ledda wrote:

> The most probably reason why they did not do it is the size of the memory to
> store the additional coefficients.  Just a guess.... 
> 
> -----Original Message-----
> From: premium-rx-bounces at mailman.qth.net
> [mailto:premium-rx-bounces at mailman.qth.net] On Behalf Of David Schofield
> Sent: Wednesday, February 22, 2012 7:04 AM
> To: premium-rx at mailman.qth.net
> Subject: [Premium-Rx] WJ-8712 Firmware.
> 
> Hi All,
> 
> Does anyone know what the latest version of firmware released for the 
> WJ-8712 was?
> Mine has version 3.0.1 control, and 4.0.0 DSP.
> I'm just curious to know if there is any later firmware out there, or 
> even better, if there is obtain a copy...
> 
> The most frustrating thing about my WJ-8712 compared to my WJ-8711A is 
> the fact that the SSB bandwidth is fixed at 3.2Khz, which seems weird as 
> it's only derived in the DSP so I don't know why WJ did it like that in 
> the first place.
> It would be nice for it to be variable up to the bandwidth of the 
> roofing filter the same as the 8711A.
> 
> I'm tempted to try a copy of my WJ-8711A firmware in it, as it used the 
> same PCB's  but haven't been brave enough so far, theirs a lot of 
> money's worth of kit at stake should something go drastically wrong.
> 
> I'm also tempted to make a PIC based front panel for it, as it would be 
> pretty straight forward to get the PIC to run round a loop scanning some 
> buttons and issuing the required serial command from a lookup table if 
> it detects a button push.
> Before I start playing with doing it that way, has anyone else tried 
> anything similar, or is it easier to use the "Test connector" on the 
> front panel, which is in effect where the front panel would plug in, in 
> a WJ8711A.
> In fact their is a "test jig" referred to in the manual, which is in 
> effect identical to a WJ-8711 but "without the guts" of the receiver.
> At a guess these are unobtainable, akin to rocking horse droppings, but 
> if anyone in the group has one they would like to throw away it would be 
> much easier to use one of these rather than re inventing the wheel :-)
> 
> 
> Thanks again in advance,
> Dave.S.
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