[Premium-Rx] WJ-8711 and WJ-8712 Power Supply Poll

[David Schofield]

I have used these PSU's in the past as a temporary measure while repairing the correct one.

FSP250-50PLB

We use them at work, so it was worth a try. It worked fine.
I cut off the existing PC cable harness and wired the requiered outputs to a piece of 0.1" Molex strip to connect to the existing wiring loom in the Rx.

They are actually a pretty good fit inside the receiver as well, and could be made to fit as a long term solution if necessary, without any physical receiver modifications.
They are readily available from approx £35 as well.

I am not suggesting that we all rush out and buy cheap PC power supplies, or that Steves solution is not better, a proper bespoke supply designed to fit will always be better, but it is another option should it be required.

I only used one in the short term, so can not vouch for long term performance Etc.

Cheers,
Dave. S.



Sent from Samsung tablet


-------- Original message --------
From: Steve Pappin via Premium-Rx <premium-rx at mailman.qth.net> 
Date: 22/09/2015  20:08  (GMT+00:00) 
To: premium-rx at mailman.qth.net 
Subject: Re: [Premium-Rx] WJ-8711 and WJ-8712 Power Supply Poll 

One thing that I should have defined and did not: This solution has to work with the entire 8711 product family which includes;

1) 8711
2) 8711-1
3) 8711A
4) 8712
5) 8712-1
6) 8712A
7) 8712P
8) HF1000
9) HF1000A
10) SI-8711A

So it has to be a switcher, have the same mechanical features, and the same harness. It will be an improvement on the original power supply but it will not be based on other technologies.

Linear power supplies, DC-DC power supplies, Battery power, and Solar power are all great ideas. The goal this time around will be to create a replacement that works in every member of the product family in every country.

Best Regards,
Steve
  ----- Original Message ----- 
  From: Steve Pappin 
  To: premium-rx at mailman.qth.net 
  Sent: Monday, September 21, 2015 2:37 PM
  Subject: WJ-8711 and WJ-8712 Power Supply Poll


  I'm taking an informal poll to see what I can do about all of these failing SP1348 power supplies. The failure rate is increasing and it's going to get ahead of my capacity to service them. So here are two realistic options:

  1) New drop in exact fit replacement unit - $$$ Expensive due to low volume of manufacturing

  2) Replacement unit that drops into the original SP1348 metal enclosure - $240.00 to $300.00
  depending on quality and volume

  There are ways to reduce cost but they are not good:
  a. Made in China - I don't want to do this
  b. A kit that you have to assemble - I can see how this could go all wrong with miswires and voltage hazards
  c. Finance - Credit line to buy materials in quantity to keep costs low - and the risk if the power supplies don't sell

  So the question is multiple choice: Would you be willing to pay;
  a. $240.00 ?
  b. $300.00 ?
  c. $500.00 ?

  In 10 days I will send out another email with the results of the poll - anonymous. My guess is that there will be very little demand until failures reach epic proportions. Remember that some of these power supplies are 20 years old and early switchers commonly failed after 10 years if that.

  Best Regards,
  Steve
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