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Old 31st Dec 2009, 8:26 pm   #10
David G4EBT
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Join Date: Feb 2003
Location: Cottingham, East Yorkshire, UK.
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Default Re: Yaesu FT-107M HF Transceiver. Help required please.

Quote:
Originally Posted by m0bzq-julian View Post
Thanks guys.

The frustrating thing is that it was working fine in Oxford so something has gone wrong on the journey home.

Hopefully someone will come along who can point me in the right direction?

Cheers,
Julian.
Always worth a quick google Julian! I googled "FT107 faults" and came up with a few bits of info which might help:

First, from: http://www.eham.net/forums/ModsAndRepairs/9621

RE: FT-107M VFO/DISPLAY FAULT
by W9GB on July 4, 2009

Allan - The Yaesu FT-107 is a nice HF transceiver, and I think was the 'first' solid-state PA by Yaesu. They are a bit rare in mint condition. "Pre-DSP/MPU era transceivers" from YAESU FT-101Z / FT-107 / Sommerkamp FT-307 / FT-707 / FT-901, 902 (later version) often made use of a custom integrated circuit (IC), MSM9520RS in their DISPLAY COUNTER UNIT. The bad news is that MSM9520RS is somewhat prone to failures.

Since this particular IC was not a standard product but a custom ordered IC by YAESU and its production has been discontinued for long time. HOWEVER, Teruhiko Hayashi JA2SVZ developed a replacement module using current PIC 16F873 microcontroller and some software programming. http://oh8jep.kotinet.com/ja2svz/ Hopefully the FT-107 VFO module has not been mechanically damaged! w9gb

End quote.

There is a host of free downloads of manuals for amateur radio gear at the rather misleadingly titled link (SCANNERS") here:

http://pdf.textfiles.com/manuals/SCANNERS-S-Z/

Technical info on the FT107:

23 pages (4.1 mB):

More technical info:

http://pdf.textfiles.com/manuals/SCA...hnical%202.pdf

13 pages (2.5mB):

http://pdf.textfiles.com/manuals/SCA...hnical%203.pdf

Ft107 Instruction Manual:

61 pages (11 mB):

http://pdf.textfiles.com/manuals/SCA...n%20Manual.pdf

Hope that helps.

Best of luck!

Regards,

David,
G4EBT.
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