[Yaesu] FT-847 Disc Meter adjustment?

2002年10月02日 20:48:32 -0700

Ron,
To fix this problem, you need to perform the "144 MHz Band Scan Discriminator
Center-Stop Adjustment" on Page 3-6 of the Service Manual. You will need a
service monitor to do this properly, or a very accurate and stable signal
generator and a deviation meter. You first set the FT-847 to receive a
particular VHF frequency, then you inject a signal that is first 3 kHz low, then
3 kHz high, and save each of these conditions into the Alignment Memory. The
CPU determines the midpoint between these extremes, and calls that the zero
point. If you then inject the center frequency, the discriminator meter should
be centered.
If you perform the alignment with a known-accurate service monitor, but your
local repeaters still show an error, I would suspect that the repeaters are not
on-frequency.
73, Eric Lemmon WB6FLY
Ronald Walters wrote:
> Have noticed that when I have correctly tuned any of the local repeaters
> that the disc meter is never centered, The display difference is about 10
> degrees to the left. I looked over the manual and can not find any
> adjustment for the meter either via a menu CPU function code or via a pot.
> Maybe I just keep missing it. No big deal but I will soon have the case off
> to install a new filter and thought that I would center the display. The
> display centers with adjustments of 900 HZ higher than the published
> frequency for the repeaters. This seems to be consistent for most of the
> repeaters.
>> Does anyone know how to adjust this function or should I just not worry and
> be glade its close?
>> Thanks for the response, 73's
>> W4LDE - Ron
>> Moderator: Ray Brown, KB�STN
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