02-10-2023, 08:48 PM
(This post was last modified: 02-10-2023, 08:48 PM by AmadeusMozart.)
The build in ATU in the rigs are imho only good to make the transmitter happy in case of a slight mismatch. Most rigs will not tune much above 1:2 or 1:3 althought the Elecraft K2 was 1:10.
I'd the Collins 180S-1 ATU in the past - that literally would tune anything. I sold it - bad move. At the moment I'm collecting parts for a balanced L-C ATU. Hardest part was finding some capable switch to move the capacitor from the transmitter to the antenna side.
I don't trust power supplies without over voltage protection - I'm at the moment repairing a 35Amp one for a friend and the SCR has fused protecting the gear behind it. Without the SCR the voltage was around 23 Volts, not healthy for some 12V equipment.
Don't know how the switched mode power supplies behave in that regard, might make an "outbox" with a SCR and a 15V zener to do the same as that would trigger protection around 15.5 Volts and most car alternators can charge around that level.
73's
I'd the Collins 180S-1 ATU in the past - that literally would tune anything. I sold it - bad move. At the moment I'm collecting parts for a balanced L-C ATU. Hardest part was finding some capable switch to move the capacitor from the transmitter to the antenna side.
I don't trust power supplies without over voltage protection - I'm at the moment repairing a 35Amp one for a friend and the SCR has fused protecting the gear behind it. Without the SCR the voltage was around 23 Volts, not healthy for some 12V equipment.
Don't know how the switched mode power supplies behave in that regard, might make an "outbox" with a SCR and a 15V zener to do the same as that would trigger protection around 15.5 Volts and most car alternators can charge around that level.
73's
