[UK-CONTEST] ft 1000mp field

[G3SJJ]

Gus, the problem I had turned out to be the Inrad Roofing Filter and I 
got an immediate replacement from them. I am posting your email onto the 
UK Contest Reflector in case anyone can help. I will forward any replies 
on to you.

73 Chris G3SJJ


Gus Samuelson wrote:
> ** 
> *De  VO1MP .... Gus  ....*
> ** 
> *HELP !   Help !*
> *I found this thread  on the UK contest reflector and was looking for 
> some information as to the possible root cause of this problem.
> /I came across this on the UK contest reflector while trying to do 
> some research on the web about diode D-1056/
> /I have a pair fields and have had to replace this diode twice before 
> and now it  has  just popped again somehow I always attributed the 
> fault to the fact that I have two simultaneously running stations from 
> time to time and some how  got  careless. However yesterday it seems 
> to  have popped again and the only common factor I can attribute to 
> the fault is that each time it occured it has been while the rig is 
> driving my Alpha 78  ...  it has never  occured while driving my alpha 
> 87a    ../
> /Your comment  makes reference to proper filters so am wondering if 
> this is a filter system at the antenna feedline sites or some  kind of 
> keying buffer between the Rig and Amplifier. Some how now I think mine 
> is related to the combination of Field and Alpha 78 ..
> Wonder if you can provide a comment or  two about  your episodes with 
> this fault. I have an amp keyer here that I have  used with an sb220  
> I have, and according  to specs  the keying volatge should not be an 
> issue but one never knows ?
> /
> /Hope  this is not an imposition /
> /and  hope to get your reply /
> /73 Brgds  gus vo1mp/
>
> *
> ------------------------------------------------------------------------
> *Thanks Paul. I think they would be C1071 and D1033 in the MP. Chatting with Don G3BJ, he has used MPs in the same operating position before and 
> not had a porblem, he also felt my MP might have been low already. Need some more investigation before I attempt any repairs.
>
> Currently hearing OM3CGN at s6 to s9 on 28011.5. Heard ZC4LI, YM and DL1AIO but none moved the S meter.* *Difficult to know under present bnad 
> condx.*
>
> *Chris G3SJJ
>
> Paul Beecham wrote:
> >**/ Hi Chris,
> />**/ Sorry to hear about your MP.
> />**/ Not sure if the rf unit in the MP is the same as the mk 5 but  before 
> />**/ I had proper filters I used to regulary zapp my mk5. front end.
> />**/ Components C1232 (0.1uf 25v chip cap.) and (D1056 1sv271 tph3 diode) , 
> />**/ were always the culprits, the latter more so. These components are in 
> />**/ the rx chain just before the band pass filters. They are chip 
> />**/ components and difficult to solder but with care it's do- able in 
> />**/ about 45 minutes start to finish, I hope this is of some help.
> />**/ 73
> />**/ Paul
> />**/ G6PZ.
> />*/
> /*>*/
> /*>*/* ----- Original Message ----- From: "G3SJJ" <**g3sjj at btinternet.com* <http://lists.contesting.com/mailman/listinfo/uk-contest>*>
> */*>*/* To: "UK Contest Reflector" <**uk-contest at contesting.com* <http://lists.contesting.com/mailman/listinfo/uk-contest>*>
> */*>**/ Sent: Saturday, December 09, 2006 9:49 AM
> />**/ Subject: [UK-CONTEST] FT1kMP zapped
> />*/
> /*>*/
> /*>>**/ Looks as though we may have zapped the front-end of my FT1kMP during
> />>**/ CQWW CW. Overall gain seems well down. On 160m my normal noise level in
> />>**/ dry conditions is around s5, currently the s meter is showing s2.
> />>**/ Likewise on 10m, given the Space weather situation, I can hear a few
> />>**/ signals but generally they are much lower and also white noise is low.
> />>*/
> /*>>**/ Unfortunately I don't have sig genny so can't do any accurate
> />>**/ measurements. Can anyone suggest what components might have gone first?
> />>*/
> /*>>**/ Chris G3SJJ
> /*