[time-nuts] PTS040 problems, was "manual for Racal 1998 and 1999...."

[EB4APL]

Nigel,

I have the pictures but it is 02:30 LT here and I have to go to bed.   
Tomorrow I'll send you the pictures and I' give you a more extensive 
description of the symptoms.  I believe now that the 7th DM module is 
not working well when the input is at one of its band limits.

Thank for your support.
Ignacio, EB4APL

GandalfG8 at aol.com wrote:
> In a message dated 09/09/2010 20:05:14 GMT Daylight Time,  
> eb4apl at cembreros.jazztel.es writes:
>
> Yes, I have downloaded them for the PTS 160, 500, 3200 and X10 and you  
> are correct, all those synthesizers share the same basic principles and  
> maybe some modules, but I found that the frequencies involved are not  
> the same.
>  
> --------------------
> Hi Ignacio
>
> You might also want to download  the manual for the PTS310 from Didier's 
> site, that and the PTS160 manual  probably incorporate most of the variations 
> that matter.
> ---------------------
>
> The problem with mine is that it shows frequency errors at  
> some settings and when it happens the generated signal shows bad  
> spectral purity.  Maybe a module went mistuned due to a component aging  
> or failure and having the right manual while is not a must it would be  
> very helpfull.
>  
> ---------------------
> I've not owned a PTS040 so am not familiar with  its structure, but my 
> guess is it will either include a bank of DM1000 modules  for steps below 100KHz 
> as per the PTS160 or a fine resolution section similar  to the PTS310.
>
> If it includes a bank of DM1000 modules,  possibly DM2000 modules if a 
> later unit, these should all be  interchangeable and, assuming none are faulty 
> can be swapped around without  causing any functional problems. The modules 
> plug in and are retained with  three screws from below.
>
> You then have the option of swapping DM1000  modules around to try and 
> isolate the fault to a particular module or could  perhaps identify the likely 
> module by looking for a pattern in those settings  where the problem occurs.
>
> This, of course, assumes that the problems are  occurring at switch 
> settings for increments below 100KHz.
> If the problem  seems to be associated with higher increment switching the 
> substitution option  no longer applies but there are then less modules to 
> worry about.
> If the  PTS040 uses a fine resolution section that does make life a bit 
> more awkward  but, as I commented earlier, it's possible that the PTS310 manual 
> might then be  of assistance.
>
> I might be able to be a bit more specific if you  could send me a list of 
> the module numbers fitted, or perhaps some high res  photos of top and bottom 
> views with the covers off, and perhaps an idea of any  pattern to the 
> problem frequencies?
>
> regards
>
> Nigel
> GM8PZR
>  
>
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