[Premium-Rx] WJ 8888-2 synthesizer failure

[R T]

Hello  Heinz.

I have  a quad 8 which has a similar fault, which I have not been able to
repair for some time.
My 8888 synthesiser uses a rare divider chip (modulo 2 division). I have
not been able to find a replacement for it anywhere.
To get the radio going again I  was thinking of making up a small sub-board
using a PIC to carry out the same maths function. It's a lot of work, and
has taken a back-seat to other projects.
It would be interesting to know if your 8888 has the same/similar issue.

Richard
 Hello Glenn,
thanks for your message.
I will check the battery first thing in the morning.
I downloaded the manual and it seems that the battery is on A22 board
behind the front panel.
Do you know of a suitable replacement for the battery?
vy 73 Heinz DH2FA, KM5VT

Von meinem iPhone gesendet

> Am 04.07.2015 um 00:26 schrieb Glenn Little WB4UIV <
glennmaillist at bellsouth.net>:
>
> Has the NiCad battery leaked?
>
> A leaking battery has all but destroyed two 8888B receivers here.
>
> 73
> Glenn
> WB4UIV
>
> At 04:38 PM 7/3/2015, Heinz Breuer wrote:
>> Hello,
>> I bought a Watkins-Johnson WJ 8888-2 receiver last weekend at the
HAMRADIO fair in Friedrichshafen/Germany at Lake Constance. The seller
assured me that the receiver was working fine and I have no reason to doubt
it. Anyhow I put it up today and there is a faulty synthesizer.
>>
>> I listend to a cw station at 7,021.80 with the 500 Hz filter. When I
slowly turned the vfo knop upwards the cw pitch changed as expected. When I
reached 7,022.00 there was no change up to 7,029.99. Obviously the actual
receive frequency did not change between 7,022.00 and 7.029.99
>> I noticed the same with an SSB station at 7,191.80. The receive
frequency didn't change between 7,192.00 and 7,199.99
>> Receiving condition were very poor today and I didn't have much time to
evaluate the fault any further but it seems that this fault exists every
10kHz at all freuencies xx,xx2.00 to xx,xx9.99
>>
>> As a first step I pulled every pc board one by one and put it back in
but it didn't help.
>>
>> I have not yet downloaded the manual and schematics. This will be the
next step. I am well aware that the receiver is almost 40 years old. I know
that it has tantalum capacitors which are prone to failure.
>>
>> If anybody experienced a similar fault I would appreciate any hint where
I should start looking.
>>
>> Thanks in advance for any help.
>>
>> vy 73 Heinz DH2FA, KM5VT
>> ______________________________________________________________
>> Premium-Rx mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/premium-rx
>> Help Page: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Premium-Rx at mailman.qth.net
>> Help Contact eMail:  paul at 8zo.com
>> Home Page:  http://www.premium-rx.org/
>
>
---------------------------------------------------------------------------
> Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
> Amateur Callsign:  WB4UIV            wb4uiv at arrl.net    AMSAT LM 2178
> QTH:  Goose Creek, SC USA (EM92xx)                      SBE ARRL  TAPR
> "It is not the class of license that the Amateur holds but the class
> of the Amateur that holds the license"
>
---------------------------------------------------------------------------
> ______________________________________________________________
> Premium-Rx mailing list
> Home: http://mailman.qth.net/mailman/listinfo/premium-rx
> Help Page: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Premium-Rx at mailman.qth.net
> Help Contact eMail:  paul at 8zo.com
> Home Page:  http://www.premium-rx.org/
>
______________________________________________________________
Premium-Rx mailing list
Home: http://mailman.qth.net/mailman/listinfo/premium-rx
Help Page: http://mailman.qth.net/mmfaq.htm
Post: mailto:Premium-Rx at mailman.qth.net
Help Contact eMail:  paul at 8zo.com
Home Page:  http://www.premium-rx.org/