[UK-CONTEST] CC April CW TX Bandwidth

[Ian White GM3SEK]

Colin wrote:
>I am not aware of causing problems with my old FT1000MP so if anyone 
>has noticed clicks from me please let me know.
>

Congratulations for having the courage to ask in public, Colin.

Here are some sound samples of what unmodified FT1000s *could* sound 
like (bottom of page):
http://w8ji.com/keyclicks.htm

There does seem to be some variability between individual rigs, but even 
the best of them are clicky and the worst are downright horrible.

>What should the FT1000MP owner look for to see if it has been modified?
>

Look for extra components under the IF board and the RF board - either 
this mod:
http://w8ji.com/keyclick_mp.htm

or the simpler Inrad version:
http://www.inrad.net/files/Pubs/About%20Key%20Clicks.pdf

Both mods are very similar, and involve extra components in the same 
locations underneath the RF and the IF boards. The easiest place to 
check is under the IF board.

Step 10 on the W8JI page shows where to look for the mod under the IF 
board. The location is in parallel with C2148 (same number in all models 
of MP, but these small capacitors are not individually marked under the 
boards). The difference is that the Inrad mod uses just two fixed 
components (100K and 0.047uF) while the W8JI allows some individual 
adjustment and can give better results.

The other part of the mod is underneath the RF board, and is the same in 
both cases: a 0.1uF cap across C1216 (in the original MP, C1004 in MkV 
and Field).  This is harder to get at, but if you can see that the IF 
board mod has been done then it's a safe bet that the RF board will have 
been done too.

If you do need to get at the underside of the RF board, W8JI has 
provided detailed photo instructions. When you actually arrive at 
C1216/1004, simply solder the 0.1uF in parallel with the existing cap 
(no need to bring out a wire lead like W8JI did).

The mods aren't actually difficult - it's mostly a matter of confidence 
- but they do need to be done.



-- 

73 from Ian GM3SEK
http://www.ifwtech.co.uk/g3sek