[1000mp] Spurious Oscillaton of PA

Fri, 14 Jun 2002 08:37:35 -0400

Had a similar problem with an older MP (Vintage 95).  I did the braid and
solder mod, moved the cable as recommended and did not do the toroids
re-work.  Did do the copper tape trick.  All of the problems went away and
have never had any problems since the mods.

Ron - W4LDE

----- Original Message -----
From: "Graeme Jackson" <[email protected]>
To: "FT1000MPDC or MK5 ?" <[email protected]>
Sent: Tuesday, June 11, 2002 06:39
Subject: [1000mp] Spurious Oscillaton of PA

I have been in contact with another Ham over a problem that we both seemed
to have.  He is a FT1000MPMK5 owner, and I am the owner of a recently
purchased second hand FT1000MPDC.  We both have the problem that the PA
takes off on 15 and 17mtrs with our station setups.  I have cured my problem
by having a word with Yaesu UK,  they sent me a modification kit comprising
of 2 small toroidal coils and a strip of sticky back copper tape.  The mod
consisted of changing 2 air cored coils on the bandpass filter board with
the toroids, and making sure that the PA compartment made good earth bond to
the side of the rig chassis using the copper tape ( note,  on my rig there
was tape already in place but the corners were doubled over making the
bonding worse ---- scratch off the corners and clean the bonding areas ! ).
Also extra earth bonding of small screens on the PSU filter and bandpass
filter boards by way of soldered 6mm earth braid.  The paperwork for the mod
appeared to originate in the USA, and was titled --- Antenna wont tune on
15mtr band.
For anyone out there with similar problems I hope this proves of interest !
Yaesu UK said as an initial possible quick fix, try winding a 2 inch / 50mm
diameter 6 turn coil in the coax lead to the antenna terminal on the rear
( external ) of the rig ---- alas this did not work for me !

73 / 72 Graeme G4CKH.     [email protected]

--- StripMime Report -- processed MIME parts ---
multipart/alternative
  text/plain (text body -- kept)
  text/html
The reason this message is shown is because the post was in HTML
or had an attachment. Attachments are not allowed.
Please post in Plain-Text only.---
_______________________________________________
List Moderator: Richard Lubash N1VXW
1000mp mailing list
[email protected]
To Change Options or Unsubscribe:
http://mailman.qth.net/mailman/listinfo/1000mp