[Yaesu] FT-450 6 Meter Problem

[Dr. Gerald N. Johnson]

More fundamentally see if the PA and driver boards are grounded. They 
generally have been grounded by the mounting screws but the plastic of 
the printed circuit board relaxes under pressure (the definition of 
"plastic") and opens ground circuits. Tighten all the board mounting 
screws and see if that doesn't help. I KNOW I've fixed many radios on my 
bench and by internet with just that, no more complex or difficult.

73, Jerry, K0CQ

On 8/14/2011 10:19 AM, Steve wrote:
>
>> On the 6 meter band, still on SSB, the meter immediately goes to almost full
>> scale, and remains there, like you had selected FM or CW, instead of SSB.
>> Changing modes makes no difference.  Whatever mode you select, nothing
>> changes.  I went into the menu and changed RF Power to 10 watts, and that
>> made no difference either.  I also did a full reset, and that made no
>> difference either.
>>
>> Suggestions anyone?
>
> Sounds like it's oscillating. If you're tecnically knowledgeable, you
> might have a look at the final and driver boards for burned or
> miscolored parts like resistors. If nothing is obvious, then check
> the bias voltage(s) on both the driver and final. Also, make a SSB
> QSO on 10M and ask whether there is any distortion; that may be a good clue.
>
> SteveH, K0XP
>
>
>
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