many decades ago, one of my first projects was home brewing a 30 amp 12 vdc
regulated power supply….I used it for a number of years on various hf and TT
rigs until I got my TT Omni 6…which for some odd reason kept blowing up the
finals…think it went back to TT 3 times(!) for final and final driver
replacement.
The tech asked me why power supply I was using on the third trip back..
I told him it was the home-brew one. Tech said it was probably an oscillation
from the home-brew supply, that kept blowing up the rig finals.
I dug out a 'scope and multimeter to run some diagnostics, but could find
nothing amiss.
I stored the homebrew power supply and dug out the power supply that came with
the rig. It has worked fb every since.
As far as I can determine, there is little in the way of isolation from the
rig's finals to the power supply other than a ferrite choke on the B+ line
going to the final brick….hence any kind of weird spikes or oscillations from
one rig could affect the electrons in a second rig on the same power supply.
On Dec 13, 2013, at 7:04 PM, Ken Brown <ken.d.brown@hawaiiantel.net> wrote:
>
>> I would prefer to have separate power supplies for each of the hf rigs just
>> to get some isolation between them rf wise….has this been a problem with
>> anyone else?
>> Have been using clamp on ferrite chokes on the dc line from the strip to the
>> rigs but can't tell if they are really doing anything.
>
> I'm curious about why you need "isolation between them rf wise" on the DC
> power leads. I think there should not be enough RF on the DC power leads to
> bother another radio connected to the same DC power supply. Is this a station
> where multiple operators are using the radios? Is more than one transceiver
> going to be transmitting at a time? If not, it would be more efficient to
> have one power supply that can supply the current draw of one transceiver in
> transmit mode and the rest in receive mode. That would be more efficient than
> multiple power supplies that can each supply enough current for a transceiver
> transmitting.
>
> DE N6KB
>
>
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