[1000mp] Spurious Oscillaton of PA

[Graeme Jackson]

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.     graeme@g4ckh.fsnet.co.uk


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