[time-nuts] SRS PRS10 problem

[EWKehren at aol.com]

Like always they have them on ebay. I know most of you do not like them but 
 they are for me the best source of obsolete parts.
Bert
 
 
In a message dated 2/16/2011 4:57:45 P.M. Eastern Standard Time,  
lists at rtty.us writes:

Hi

Since the unit is current production, the part should be  around. There are 
a
number of the old Motorola RF parts that are very hard  to find. They have
been out of the RF business for quite a while. That  should not be one of
them. 

Based on a quick search, M/A-Com seems  to make them. $20.95 at RF Parts.
There may be other sources as well.  

Bob

-----Original Message-----
From:  time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of  paul swed
Sent: Wednesday, February 16, 2011 4:31 PM
To: Discussion of  precise time and frequency measurement
Subject: Re: [time-nuts] SRS PRS10  problem

Well a couple answers.
If those are RB whiskers try the heat  gun at 300 degrees on it for 15
minutes. As Magnus suggests and I just  tried for the first time. It 
actually
worked and I recovered the rb  lamp.
I imagine the transistor may be hard to get but its a motorola should  be
obtainable.
Good luck
Regards
Paul
WB8TSL

On Wed, Feb  16, 2011 at 4:19 PM, Pete  Lancashire
<pete at petelancashire.com>wrote:

> write a letter  (real one) to their ceo & pres and if there is a
> engineering VP,  only cost you a buck, fifty.
>
> sometimes works
>
>  -pete
>
> On Wed, Feb 16, 2011 at 12:11 PM, Brendan Minish
>  <ei6iz.brendan at gmail.com> wrote:
> > Right, to follow up on my  own email
> >
> > I took it apart
> > The lamp  assembly has failed.
> >
> > In the PRS10 the lamp is exited  by a strong RF field @ 150Mhz
> > this is generated by an MRF134  within the lamp package
> >
> > The failure mode was caused  by the growth of a substantial tin whisker
> > within the lamp  assembly which appears to have killed the MRF134.
> >
> > I  made contact with SRS about purchasing a replacement lamp assembly 
but
>  > since I bought it on the used market they are not willing sell me  a
> > replacement lamp assembly. Frankly I am not terribly impressed  with
their
> > response on this.
> >
> > Does  anyone on list have a 'donor' PRS10 that might have a good lamp
> >  assembly that they would be willing to sell me ?
> > Perhaps someone  on list has a commercial relationship with SRS and 
might
> be
>  > able to assist me with purchasing it?
> >
> > Hoping  someone can help out, My alternative is to attempt to source an
> >  MRF134 and have a go at replacing it but there may be other damage in
>  there
> >
> > regards
> > Brendan
>  >
> >
> >
> > On 14/02/2011 18:53, Brendan  Minish wrote:
> >>
> >> Hello all
>  >>
> >> My SRS PRS10 (  http://www.thinksrs.com/products/PRS10.htm ) Rubidum
> >>  frequency standard was power cycled a few days ago, since then it has
>  >> not achived rubidium lock.
> >> I have tried a full rest  and also further power cycles with no joy.
> >>
> >>  The SRS RS232 application reports the following parameters that 'look
>  >> wrong'
> >> ad3 (lamp drain ) 2.001
> >> sd2  (fet voltage set ) 255
> >>
> >> ad3 at 2 (Lamp drain  volatge 20V) would appear to correspond with the
Rb
> >> lamp  discharge not beginning
> >>
> >> this unit is of  course out of guarantee and came to me via Ebay about 
5
> >> years  ago, is anyone on list familiar with troubleshooting these units
>  >> who Might have some general ideas of how best to proceed with  
repairing
> >> the unit
> >>
> >>
>  >
> >
> > --
> > 73
> > Brendan  EI6IZ
> >
> >  _______________________________________________
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> >
>
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