De Gus VO1MP
Am looking for some information as to the possible root cause of this problem
I have a pair FT1000MP Fields and have had to replace diode D1056 ( 1sv271
tph3 diode)
twice before and now it has just popped again
This diode is in the rx chain just before the band pass filters. It is a
chip
component and difficult to solder but with care it's do- able in
about 45 minutes start to finish, by my friend who is very adept at trouble
shooting and
with soldering tools
I had always attributed the fault to the fact that quite often I run two rigs
simultaneously
and some how got careless .
However recently this diode popped again , using it alone woithno other rig
running,so
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 ..
Some how now I think this must be related to the combination of FIELD and
Alpha 78 ..
wonder if anybody has had a similar issue and can provide a comment or two
about cause of this fault.
I had been keying the amp directly from the Mark V Field but I have an amp
keyer here that I have used with
an sb220 that I can use and according to specs the
keying volatge shud not be an issue but one never knows ?
APPRECIATE ANY HELP ?
_______________________________________________
Yaesu mailing list
Yaesu@contesting.com
http://lists.contesting.com/mailman/listinfo/yaesu
|