Date: Wed, 25 Jun 2014 21:41:36 +0100
From: David Lisney <g0fvt@hotmail.com>
To: "amps@contesting.com" <amps@contesting.com>
Hi, the power supply for the Quadra is a switch-mode, the manual seems to
reckon 240v is ok.
In the UK our mains voltage is 240v, as far as I know Quadras survive that
fine... I personally would run it straight off your mains supply... the buck
transformer is a valid approach to sorting out the supply voltage issue...
however it is vital that current is not allowed to pass through the low voltage
secondary without the primary powered.
A 15v 10a transformer should do the job...
regards David G0FVT
## I see no reason why a 10-15v @ 15A CCS xfmr cant be used.... with NO 120
vac applied to the 120 vac primary of the buck-boost xfmr. All that would
happen is you wont get any boost-buck action.
If you really want to get fancy, you can always install a small 0-120 vac
variac, say a 2A CCS variac, on the primary side of the buck-boost xfmr..and
vary the amount of buck-boost you want... from 0-15 vac in this case.
## Having said all that, has anybody actually blown a Quadra up.....from
line V being too high ??? I could see transients-spikes-surges etc,
blowing it up.... but that is something that could be averted with movs at the
main 200A panel etc.
## Interesting to note that the old Q manual sez its rated up to 234v. New
manual sez its rated to 240 vac. Wonder if they just changed the manual ?
## If you folks do try a buck-boost xfmr, make damn sure its wired for
buck..and NOT boost... or you will be in for a rude awakening. Test the xfmr
out on a 100 watt light bulb 1st... + DVM.
## Does yaesu still make the quadra ? I see Acom has its 600 w SS amp in
production....which will handle just about any line V you can throw at it.
It also has power factor correction built into it. But at $3K a copy, I think
I will pass on it..esp with the lousy IMD.
Jim VE7RF
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