Hi Paul
Thanks for your comments. The beacon has been running for several days now and the final seems ok temp wise with the output at 5.08V. I used this table of RF volts into 50 ohms
As others already noted, the table is peak voltage, not peak-to-peak. That's where the missing division by 2 comes from.
Also bear in mind that table is for 50 ohm load. You were using 36 ohms so it needs to be adjusted.
One problem I am seeing is the keyer often 'locks' up after sending the call once or a few times. Once though it ran all nite and was still keying. I wonder if it is related to the supply ? I am using an old Heathkit Reg P/S IP-18 that seems stable and clean.
This seems to happen sometimes and I think is due to the floating inputs. My recommendation is to ground any of the pins 5, 6 and 7 which you haven't tied to +Vcc. That normally will address this problem.
73 de Hans G0UPL
