Thank you Robert & Mat.?
I’ll try the trimmer cap first to see what effect it has on the displayed frequency.?
In the meantime, a more impacting challenge has arisen... weak modulation on AM.?
With Mic Gain at max, people comment on poor modulation. I can’t get any action on the ALC meter in AM and need to almost shout to get it moving on SSB. ?
Given your respective experiences, any clues will be appreciated.?
If it’s significant, the unit was built in 1985.?
All the best,
Mark
VK2MOH
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On 2 Jan 2021, at 02:24, Mat Breton <i.m.n8tw@...> wrote:
?Hi Mark,
The heated 30MHz master crystal will drift over time as it (and other components like the pulling caps) age. After almost 40 years this drift will probably be signficant (it certainly was in my FT-980). I included an article in the "Repair" folder in the files section on how to "re-calibrate" it, along with what to do if the drift exceeds the stock trimmer-cap adjustment capability.
-Mat
N8TW
