To me the real solution is to incorporate an internal power supply. I
agree that higher PA voltages will produce cleaner transmitters.
Therefore multiple voltages, no problem, minimized ground loop issues,
reduce number of cables. Only one box to transport as opposed to two.
No extra cables to forget or have a cable with wrong connectors. I
recall reading recently about a fellow that connected his radio in a
reverse polarity condition. With an internal PS, this wouldn't
occur. Since we have to have a PS after all, why not just make it
internal.
73
Bob, K4TAX
On 10/2/2015 3:12 PM, brian wrote:
Fred,
I'm a fan of higher voltage -- perhaps 24 or 40 volts so that PA
transistors can produce cleaner signals. Doing so reduces any IR
drop on power supply wiring by a factor of 2 or 3. KISS.
IC's are going to lower and lower voltages. Multiple circuits
within boxes require a menagerie of voltages. One is faced with
having to generate more heat in regulators dropping 40 volts to 12,
maybe 5, 3.3 and 1.6 V. Perhaps the era of efficient multivoltage
power supplies with multiple wires for multiple voltages will
return. (Remember filament ,plate, screen and grid voltage power
supplies in days of yore? Guys generally didn't mistakenly hook up
the 3500 V B+ wire to the filaments......)
73 de Brian/K3
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