[Premium-Rx] [Watkins-Johnson] Fw: WJ-8711A-3 Strange behavior...

Wed Apr 14 21:13:38 EDT 2010

Hi, 

Your photos struck me, I never saw an A/B buttons. Looking at the manual there is no mention nor picture of a A and B. The off center det switch is another puzzle, although one fold out has the illustration of the off centered button. The key here is that this is a -3, even the front panel has this in the silk screen. I think all bets are off with respect to the correct software. U12 should be 4.x depending on the DSP board but yours has that label of -3. It would be interesting if you reversed engineering the two buttons (A & B) . I'm wondering if you called Dave Shane at DRS or what ever the company is called today, if there is still anyone left who could give you some history. You could call looking to spend money but insist that this is a -3 and does anyone have information on this version before you sent in it or something like that. Good luck and I would be interested in hearing if you get anywhere. 

Take care, 
Jon, KB1DC 

----- Original Message ----- 
From: "James A. (Andy) Moorer" <jamminpower at earthlink.net> 
To: watkins-Johnson at yahoogroups.com 
Sent: Wednesday, April 14, 2010 3:08:54 PM (GMT-0500) Auto-Detected 
Subject: [Watkins-Johnson] Fw: [Premium-Rx] WJ-8711A-3 Strange behavior... 

Pls respond directly to sender (and to list) 
James A. (Andy) Moorer 
www.jamminpower.com 

----- Original Message ----- 
From: "ka5fun" < ka5fun at juno.com > 
To: < Premium-Rx at mailman.qth.net > 
Sent: Wednesday, April 14, 2010 1:27 PM 
Subject: [Premium-Rx] WJ-8711A-3 Strange behavior... 

> 
> Gentlemen, 
> 
> As previously mentioned, I recently purchased a WJ-8711A-3 receiver. 
> When it arrived, I discovered that it is unusual in several ways, and has 
> a rather strange problem. 
> 
> Serial #: 14 
> 
> Front Panel EPROM: 871Y 
> A1A1U3 
> 1.21 
> 
> DSP EPROM: 871Y 
> A2 U56 
> 05.00.00 
> 
> Internal Control EPROM: 8711A-3 
> A2 U12 
> 01.00.00 
> 
> The DSP PCB has the following numbers printed on it: 
> 08 95 6259 -01 
> 14632ASSY 
> 797214 A 
> 
> OBSERVATIONS: 
> 1- All detection modes seem to work normally except for USB and LSB. 
> 2- All selectable IF Bandwidths seem to work normally. 
> 3- All front panel buttons seem to work normally. 
> 
> PROBLEMS: 
> 1- Signal Strength Meter reads approximately 8 dBm low 
> 2- No Notch Filter function available when pressing the "Special 
> Functions" button? 
> (Is this because of the inclusion of the FSK detection mode?) 
> 
> QUESTIONS: 
> 1- What are buttons "A" and "B" for? (see fig. 1) 
> 2- Detection Mode button physically not centered on the front panel? (see 
> fig. 2) 
> 3- The Main Tuning Knob is rather stiff - how can I remove and/or loosen 
> it? 
> (No apparent holes to access the setscrew(s) on the side of the 
> knob) 
> 
> PICTURES: 
> fig. 1 is at: http://img.photobucket.com/albums/v202/ka5fun/Fig-1.jpg 
> fig. 2 is at: http://img.photobucket.com/albums/v202/ka5fun/Fig-2.jpg 
> 
> ---------------------------------------------------------- 
> -------------------- 
> TESTS PERFORMED TO DEMONSTRATE THE ODD BEHAVIOR OF THE RECEIVER WHEN SET 
> To USB or LSB MODE. 
> ---------------------------------------------------------- 
> -------------------- 
> 
> TEST-1: 
> With the receiver set to ISB and tuned to 5.000 MHz, the resulting audio 
> frequency is constant, regardless of the selected IF Bandwidth. 
> Signal generator set for 5.001 MHz CW @ -50 dBm, Speaker set to USB, 
> audio output = 1,000 Hz. 
> Signal generator set for 4.999 MHz CW @ -50 dBm, Speaker set to LSB, 
> audio output = 1,000 Hz. 
> 
> ------------------------------------------- 
> ----- Receiver is performing normally ----- 
> ------------------------------------------- 
> 
> TEST-2: 
> With the receiver set to either USB or LSB, the resulting audio frequency 
> is incorrect and NOT constant when changing the IF Bandwidth. 
> Signal generator set for 5.001 MHz CW @ -50 dBm for USB and 4.999 MHz CW 
> @ -50 dBm for LSB 
> 
> IF Bandwidth Audio output 
> KHz Hz 
> -------------------------------------- 
> 0.900 300 
> 1.000 400 
> 1.100 500 
> 1.200 600 
> 1.300 700 
> 1.400 800 
> 1.500 900 
> 1.600 1,000 
> 1.800 1,200 
> 2.000 1,400 
> 2.200 1,600 
> 2.400 1,800 
> 2.600 2,000 
> 2.800 2,200 
> 3.000 2,400 
> 3.200 2,600 
> 3.600 3,000 
> 4.000 3,400 
> 
> Audio output should be 1,000 Hz regardless of the IF Bandwidth, and one 
> should not be able to select an IF Bandwidth greater than 3.2 KHz when in 
> USB or LSB mode... 
> 
> --------------------------------------------- 
> ----- Receiver is performing abnormally ----- 
> --------------------------------------------- 
> 
> My personal feeling is that it is likely to be a firmware problem and 
> that one or more of the EPROMS may either be flaky or of the incorrect 
> part number. 
> Except for the USB and LSB modes the receiver seems to perform well. 
> 
> To confirm my hunch, and possibly cure my receiver, I would like to get a 
> copy of the latest "standard" WJ-8711A EPROMs: 
> Internal Control EPROM (A2U12) - Version 04.01.10 and DSP EPROM (A2U56) - 
> Version 04.02.07. 
> 
> Any help, advice, or suggestions would be greatly appreciated. 
> 
> Best Regards, 
> 
> Pete [KA5FUN] 

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