[Premium-Rx] More on WJ 8716
Paolo Viappiani
pviappiani at tin.it
Thu Sep 28 14:58:28 EDT 2017
Hi Dan:
I would like to be of some help in order to fix the problems of your WJ-8716 receiver, but I need some more info.
So please let me know:
1) Is your WJ-8716 of the "plain" or of the "/MFP" version?
2) Which are exactly the A..." Cards that you swapped out in the middle bay next to the preselector?
3) Please let me know all the identifying numbers of the cards in the A4, A5 and A6 motherboards and their EXACT locations.
4) Please be more precise about the receiver behavior after power on. Have you tried to apply a signal generator to the receiver antenna input and to verify if there is any audio output in any mode?
Waiting for your reply, best 73!
Paolo
Paolo Viappiani
Via Magenta, 32 - loc. Fossola
54033 Carrara (Massa-Carrara), Italy
email: pviappiani at tin.it
Cell. Phone: +39-338-9383105
Inviato da iPhone
Il giorno 28/set/2017, alle ore 18:09, Dan Robinson <dxace1 at gmail.com> ha scritto:
> Thanks to Peter for responding to my question on WJ repair. Turns out
> that the receiver DOES power up, LED's are bright and look barely used,
> and the receiver does have the rare preselector and ISB. I hate to simply
> part out the radio. I may do that, or simply re-list the receiver noting
> the
> presence of the PRE option and all the original boards. BTW -- I did swap
> out
> the A.....cards in the middle bay next to the preselector but no luck in
> getting
> any audio. Wondering if this could be a RF input issue. I was not able to
> swap
> out other main boards as I don't have identical spares of those. Any other
> ideas,
> or anyone interested in tackling trying to bring this back to life,
> appreciated.
>
>
> On Sun, Sep 24, 2017 at 1:03 PM, <premium-rx-request at mailman.qth.net> wrote:
>
>> Send Premium-Rx mailing list submissions to
>> premium-rx at mailman.qth.net
>>
>> To subscribe or unsubscribe via the World Wide Web, visit
>> http://mailman.qth.net/mailman/listinfo/premium-rx
>> or, via email, send a message with subject or body 'help' to
>> premium-rx-request at mailman.qth.net
>>
>> You can reach the person managing the list at
>> premium-rx-owner at mailman.qth.net
>>
>> When replying, please edit your Subject line so it is more specific
>> than "Re: Contents of Premium-Rx digest..."
>>
>>
>> Today's Topics:
>>
>> 1. Re: Design Assistance Sought (Jon Iza)
>> 2. Rohde and Schwarz XSRM (David Schofield)
>> 3. 1953 station redux (PETER PATTON)
>> 4. WJ Repairs (Dan Robinson)
>> 5. Re: WJ Repairs (Peter Gottlieb)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Tue, 12 Sep 2017 08:50:30 +0200
>> From: Jon Iza <jon.iza at gmail.com>
>> To: Premium-Rx at mailman.qth.net
>> Subject: Re: [Premium-Rx] Design Assistance Sought
>> Message-ID:
>> <CAHvTrdL4kFKHaeyYadU9igiU7e6bUYx2mMOzs+Fgay78Yqy30g at mail.
>> gmail.com>
>> Content-Type: text/plain; charset="UTF-8"
>>
>> Folks,
>> I recently saw a picture of a little box with a row of BCD encoders wired
>> to the
>> connector in the back of a Harris RF230 transceiver. It is from Dale KW1I:
>> http://www.mrca.ar88.net/Old%20Pages/Net/Images/C-LRRP%
>> 20RADIOS/RF-230%20Radio%20002.jpg
>> As Peter writes, it is quite simple to design such system on an Arduino
>> with an encoder, an LCD, and three I2C 8 bit I/O expanders (for wiring
>> simplicity,
>> instead of a multiplex).
>> Someone started such a project, but it is not finished
>> https://circuits.io/circuits/651406-harris-rf230-frequency-bus-control
>> You may see what is involved.
>> With an Arduino MEGA there will be no need of expanders, as plenty of
>> digital
>> ports are available.
>> jon, ea2sn
>>
>>
>> ------------------------------
>>
>> Message: 2
>> Date: Tue, 12 Sep 2017 12:16:55 +0100
>> From: David Schofield <davesc50 at tiscali.co.uk>
>> To: premium-rx at mailman.qth.net
>> Subject: [Premium-Rx] Rohde and Schwarz XSRM
>> Message-ID: <e02fc918-4ff5-9ab1-708e-29d143c3d0f0 at tiscali.co.uk>
>> Content-Type: text/plain; charset=utf-8; format=flowed
>>
>> Hi All,
>>
>> This is a long shot, but you never know until you ask....
>>
>> I've just acquired a R & S XSRM Rubidium standard for my workshop, dirt
>> cheap I might add, along with the off air receiver, phase meter, and
>> frequency divider which provides all the useful outputs from 100Khz to
>> 10Mhz.
>>
>> It's just arrived with me, and has unfortunately been "heavily
>> decommissioned".... Someone has cut up a lot of the internal wiring,
>> which is not the end of the world, I can sort that out.
>>
>> The main problem is that they have also removed the Rubidium lamp,
>> making the whole package nowhere near as useful as I was hoping it was
>> going to be.
>>
>> It should still act as an off air standard without the lamp according to
>> the manual, so it's not a total loss, but I'm just wondering if anyone
>> out there has, or knows where to get hold of a replacement lamp?
>>
>> I know this isn't exactly a Premium Rx post, but a lot of you out there
>> will have a Rubidium standard Etc, so I thought it was worth an ask.
>>
>> I'm quite happy to pay a reasonable price for a lamp, although I have no
>> idea what a "reasonable price" may be.
>>
>> Other than the butchered wiring and missing lamp, the unit is actually
>> in very nice condition, and only just out of calibration. Looking at the
>> stickers it has come from R & S themselves, and was obviously an "in
>> house" standard.
>>
>>
>> Thanks in advance,
>>
>> Dave.S.
>>
>>
>>
>>
>> ------------------------------
>>
>> Message: 3
>> Date: Tue, 12 Sep 2017 09:57:42 -0400 (EDT)
>> From: PETER PATTON <peter.patton at cox.net>
>> To: premium-rx at mailman.qth.net
>> Subject: [Premium-Rx] 1953 station redux
>> Message-ID: <355617441.5200.1505224662336 at myemail.cox.net>
>> Content-Type: text/plain; charset=UTF-8
>>
>> I am trying to reconstruct the station I had in college in Boston in 1953:
>> an augmented 75A-1 and a 32V-2 (then usable only after the TV stations went
>> off the air). The Rx was augmented by an RME pre- selector which I have
>> located and a BC-453 Q-5er which I still need. If any of you Premium Rx
>> guys out there have a languishing old BC-453 based Q-5er you would be
>> willing to sell me I would like to buy it. The plan is to see how well
>> these augments actually improved the rather poor sensitivity and
>> selectivity of the venerable 75A-1 by comparing an augmented one to a
>> modern premium Rx like the W-J 7811A-3 or the Collins 851S-1. Of course,
>> Collins solved both problems with the 75A-2 but, alas, they made the new Rx
>> look different than the 32V series. Very bad optics for the purist!
>>
>> Pete W0EWQ
>>
>> peter.patton at cox.net
>>
>> ------------------------------
>>
>> Message: 4
>> Date: Sun, 24 Sep 2017 12:35:33 -0400
>> From: Dan Robinson <dxace1 at gmail.com>
>> To: PREMIUM-RX <premium-rx at mailman.qth.net>
>> Subject: [Premium-Rx] WJ Repairs
>> Message-ID:
>> <CAFaJbSbQtbu4mzG9UQJaEs73isp8LUuuhxTgiF=38X1AXcwzMg at mail.
>> gmail.com>
>> Content-Type: text/plain; charset="UTF-8"
>>
>> Wondering if those in the group who still operate WJ
>> equipment, and I know you are all out there, know of
>> anyone capable of doing the kind of repairs formerly
>> done by PCS Associates (Steve Pappin). We have seen
>> a lot of WJ boards and other parts appear from various
>> overseas sellers, primarily in Turkey for some reason. But
>> it's obviously hard to tackle serious issues, such as tantulum
>> cap failures, and tracking down sources of problems, without
>> sufficient equipment to do the job.
>>
>>
>> ------------------------------
>>
>> Message: 5
>> Date: Sun, 24 Sep 2017 13:03:08 -0400
>> From: Peter Gottlieb <hpnpilot at gmail.com>
>> To: premium-rx at mailman.qth.net
>> Subject: Re: [Premium-Rx] WJ Repairs
>> Message-ID: <0d2b0957-d297-5459-b8f1-89f53d0ac868 at gmail.com>
>> Content-Type: text/plain; charset=utf-8; format=flowed
>>
>> These radios are not especially difficult to repair, especially when the
>> manuals
>> are available.? Tantalum capacitor problems are not really "serious"
>> problems,
>> just sometimes tedious to re-cap. However, I have found two problems:
>> 1)? Some parts are difficult to find or very expensive.? Example - when
>> Steve
>> sold off his repair parts the batch of tantalum capacitors went for a
>> shocking
>> amount of money (yes, I know what list price is, but still that was a lot
>> of
>> stock and money to sit in inventory).? Another example are chips which
>> have long
>> gone obsolete or parts like filters.? Certain old transistors are going
>> bad in
>> droves and while no longer available are easily substituted with more
>> modern and
>> better replacements (if you know how).
>> 2)? The calibration/adjustment procedures in the manuals are full of
>> errors.?
>> Some are obvious and easy to correct (wrong pin number to measure) but
>> others
>> look like they were copy/pasted from something else and don't make any
>> sense.?
>> With modern gear such as a VNA I tend to read through a procedure and then
>> make
>> my own anyway, especially if their procedure is convoluted.? Better
>> results quicker.
>>
>> Combined this makes commercial repair very expensive, time consuming and
>> limits
>> hobby type repair work.? I know I've successfully repaired quite a number
>> of
>> different ones over the years and at this point unless it's a good friend I
>> won't take it on.? I have the gear and knowledge to do the work but when I
>> truly
>> estimate the time and parts cost the response is always that it is way too
>> expensive.? I have heard the exact same thing from some others who are
>> getting
>> out, or about to get out of, the high end radio equipment repair
>> business.? It
>> is no longer a viable business with most hobbyists who bought the
>> equipment for
>> pennies on the dollar and expect repair work to be similarly discounted.
>>
>> I think what this will do is accentuate the price difference between
>> working and
>> non-working sets and those who want a set and have the knowledge and time
>> to dig
>> in will have that avenue.? On sets with pluggable boards and modules,
>> swapping
>> them out will become the troubleshooting and repair method of choice.? Of
>> course
>> the bad boards will end up on ebay as "unable to test" so caveat emptor.
>>
>> I've seen a lot of radio gear come out of Turkey.? ISTR the US or NATO had
>> a big
>> monitoring post there and either closed it down or upgraded extensively and
>> scrapped out many tons of gear.? At least they didn't grind it all up.
>>
>> Peter
>>
>>
>>
>>
>> On 9/24/2017 12:35 PM, Dan Robinson wrote:
>>> Wondering if those in the group who still operate WJ
>>> equipment, and I know you are all out there, know of
>>> anyone capable of doing the kind of repairs formerly
>>> done by PCS Associates (Steve Pappin). We have seen
>>> a lot of WJ boards and other parts appear from various
>>> overseas sellers, primarily in Turkey for some reason. But
>>> it's obviously hard to tackle serious issues, such as tantulum
>>> cap failures, and tracking down sources of problems, without
>>> sufficient equipment to do the job.
>>> ______________________________________________________________
>>> 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: radio at 8zo.com
>>> Home Page: http://www.premium-rx.org/
>>
>>
>>
>> ------------------------------
>>
>> _______________________________________________
>> Premium-Rx mailing list
>> Premium-Rx at mailman.qth.net
>> http://mailman.qth.net/mailman/listinfo/premium-rx
>>
>>
>> End of Premium-Rx Digest, Vol 130, Issue 3
>> ******************************************
> ______________________________________________________________
> 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: radio at 8zo.com
> Home Page: http://www.premium-rx.org/
More information about the Premium-Rx
mailing list