It’s a unique undertaking for sure. You’re probably the first I’ve heard of wanting 5kw in a primarily SSB mobile. I’d never do it just because I like to talk with the truck off.
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5kW Mobile tube or solid-state?
- Thread starter Unit 148
- Start date
It’s a unique undertaking for sure. You’re probably the first I’ve heard of wanting 5kw in a primarily SSB mobile. I’d never do it just because I like to talk with the truck off.
I'ld either go the 50v or Tube route.
The Tubes give much more bang for the buck. Plus they are extremely forgiving. Wild SWR swings, +- a few thousand volts on the plate...no problem. Just keep the filament voltage rock steady.
The Tubes give much more bang for the buck. Plus they are extremely forgiving. Wild SWR swings, +- a few thousand volts on the plate...no problem. Just keep the filament voltage rock steady.
For every day talking while driving around an 8 pill is plenty, especially for SSB use. To go 5k like that there is too much that can go wrong and way too much RF energy to be around all the time like that. It's fun to consider and talk about but not very realistic.
A 5 kW amplifier for sideband will have an average power of 2 or 3 Kw. You'll need twice that much from the amplifier's power supply.
Adding 6 kW to the vehicle's electrical supply will probably cost more than the amplifier.
73
Adding 6 kW to the vehicle's electrical supply will probably cost more than the amplifier.
73
Too bad 90% of them arrive at the filament voltage through a .1 ohm 300 watt resistor, making it totally impossible to stay within the limits of filament voltage. When the input to that resistor can fluctuate between 12.6 and 14.1 volts, nothing you can do without the addition of regulation can keep you in the proper range.
Out of the many dozens I have seen over the years, every single one of them said Peter Dahl on them.
Custom transformers?
This guy, Peter Eggiman [URL]http://www.epd-inc.com/[/url]
He can design and build anything that Peter Dahl could.
73
This guy, Peter Eggiman [URL]http://www.epd-inc.com/[/url]
He can design and build anything that Peter Dahl could.
73
Only if you’re ok with that uneasy feeling every time you key up your HGs. Lol.
Separate alternator/regulator is the trick. But yea
Actual milage may vary.
I'm inclined to think that either 50V LDMOS or a tube is the way to go and not 12V or volting them higher that 14 for long term reliability and reasonable IMD numbers. Nomad, there is a faily big difference between average and peak power draw and with a brace of decent AGM or Lithiums and a capacitor or three they will I'm sure keep voltage droop to a minimum on speech peaks. Sideband is relatively easy on mobile power supplies as compared to balls to wall class C, over-driven, over volted AM.
So is there just a low voltage primary winding on such a mobile Dahl or is there some black magic in the windings?
Unit 148
So is there just a low voltage primary winding on such a mobile Dahl or is there some black magic in the windings?
Unit 148