[UK-CONTEST] 12v PSUs

[John Lemay]

Clive

I think you may be surprised and disappointed to see that some parts of
various rigs are connected direct to the 12v connector, NOT via the front
panel switch. And that's in addition to the "idiot diode" and some rf and
lower frequency decoupling. One rig (I can't remember which) that I looked
into recently had the PA devices always connected, presumably because the
front panel switch is not man enough for the job.

Take a look at the circuit diagram.

Regards

John G4ZTR

-----Original Message-----
From: uk-contest-bounces at contesting.com
[mailto:uk-contest-bounces at contesting.com]On Behalf Of Clive Whelan
Sent: 12 December 2005 18:18
To: uk-contest at contesting.com
Subject: Re: [UK-CONTEST] 12v PSUs



Thanks Ray

I have been happy with this one, but it does appear to be "trigger happy",
and the probability is that the ICOM looks like a highly capacitative load,
even when powered OFF, thus looking like a short cct for an instant until
the capacitor charges. I have been very happy with the Nissei unit, and it's
really dinky and RF quiet up to 50Mhz. Looks like I may have to get another
"big bertha" however :-(

73


Clive
GW3NJW


Hi Clive,

The best advice I can give you is to dump the switched mode supply.  I hate
them.  Apart from the safety issue, I have never found them to be reliable.
In my view nothing to beat a good old transformer driven PSU!  If well
designed and built, they stand a lot of abuse and go on for ever.  The
nearest I have come to "fit and forget".

Ray, G3HRH
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