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Station X · 23rd Jul 2017, 10:33 am

As far as I can see there are a lot more coils in the driver unit than are shown on the circuit diagram. 32 in fact, 2 for each channel. Shorting links have to be inserted across the points you show as described on page 8 of the manual.

The initial tuning procedure for each preset channel seems to be pretty elaborate and I wonder if you've carried it out for whatever crystal frequency you're using?

The PA also requires initial tuning to match the aerial and it's possible the aerial originally used with this set doesn't have the same characteristics as your dummy load, so PA tuning may be needed too.

23rd Jul 2017, 10:33 am	#54
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,288	Re: Sailor T128 Marine Transmitter. As far as I can see there are a lot more coils in the driver unit than are shown on the circuit diagram. 32 in fact, 2 for each channel. Shorting links have to be inserted across the points you show as described on page 8 of the manual. The initial tuning procedure for each preset channel seems to be pretty elaborate and I wonder if you've carried it out for whatever crystal frequency you're using? The PA also requires initial tuning to match the aerial and it's possible the aerial originally used with this set doesn't have the same characteristics as your dummy load, so PA tuning may be needed too. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.