[Milsurplus] SCR-288/BC-474

[Nicholas Hopper]

Thanks John,  I have the one TM for it, not sure what else is there but will
see if I can get in contact with Robert for anything else available for
this.  

David,  Are there any other publications noting changes made to these?  I
know how the military works with printing original manuals then producing
updates.  I have seen this with other things I have collected and especially
with the jeeps (proud owner of a 1945 MB in restoration).

Nick

-----Original Message-----
From: J. Forster [mailto:jfor at quikus.com] 
Sent: Tuesday, January 03, 2012 9:28 AM
To: Nicholas Hopper
Cc: 'David Stinson'; milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] SCR-288/BC-474

Just in case you don't, you should get the manuals if you don't have them.
Robert Downs is a good source4.

Having the books makes things a lot easier.

-John

=============


> Thank you everyone for the replies.  Well my skills are , well let's say,
> lacking in this department. But I'm always up for a challenge!  I will get
> some pictures taken and send them out of it.   I'll get to work on the few
> items that have been mentioned but I feel I will have to find someone
> local
> to help in testing and troubleshooting this unit.  A great chance to meet
> someone and learn at the same time!  But I will at least dig in where I
> can
> at this time and see what I can do.
>
> Nick
>
> -----Original Message-----
> From: David Stinson [mailto:arc5 at ix.netcom.com]
> Sent: Tuesday, January 03, 2012 4:06 AM
> To: Nicholas Hopper; milsurplus at mailman.qth.net
> Subject: Re: [Milsurplus] SCR-288/BC-474
>
> Welcome, Nicholas!
> You have a very desireable set there- the GN-44 alone has
> many members reading with envy ;-).  It is a fairly advanced
> project for a beginner, but certainly "do-able."  I have two and
> use them on the air operating as originally designed.  They
> work fine.  I have to get to work this morning but when
> I get home, I and I'm sure many more of our great members
> will see if we can help.  First off- how are your trouble-shooting
> skills and what test equipment do you have?  There are going
> to be some componants that will need replacement.
>
> The popping and noise you hear can have mulitple sources.
> It's likely the switch needs cleaning with a compound like
> De-Ox-it, but there is also the good possiblity of electrical
> leakage through capacitors.  If this is happening, you run
> the risk of damaging other componants to which these are
> connected.  Until we can examine them, I'd advise leaving
> the set off.  Also- in your battery replacement design for
> the receiver power supply, make sure the B- end is not
> connected to ground.  The reason the audio output
> transformer needed replacing is someone using a receiver
> high voltage supply with the B- grounded, which will
> instantly destroy the original transformer.
>
> Also- you might want to consider removing mods like
> that 6C4 stage, which was a needless addition and
> which will cause trouble.  Mine modulates just fine
> with the correct microphone.
>
> It will be very helpful if you can take some good
> detail photos of the chassis so we can see its
> condition.
> Got to get to work.  More later.
> 73 DE Dave AB5S
>
> p.s. First thing- In the middle of the back of the chassis is
> a tall, silver can capacitor.  If unchanged, it will have a wire
> that runs to the TRANS  REC  switch.  You should disconnect
> this wire and move it out of the way.  It's a design error
> that was corrected in an official change order.  More later.
>
>
>
>
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Version: 2012.0.1901 / Virus Database: 2109/4720 - Release Date: 01/03/12