[K3CAL] Power Supply Problem

[David Weaver]

Karl.

A another thing you may want to try would be grounding now that you're
retired and have all this free time ha ha.

Try grounding all your equipment to a grounding post outside.

If you read the books on grounding the will give you a headache. There are
all different kinds such as electrical ground and RF ground.

I know this firsthand it help me with a lot of problems and my ham shack.

Dave

W3PQS

 

From: K3CAL [mailto:k3cal-bounces at mailman.qth.net] On Behalf Of Karl Long
Sent: Wednesday, June 10, 2015 8:04 PM
To: k3cal at mailman.qth.net
Subject: [K3CAL] Power Supply Problem

 

I have two radios, both ICOMs. One is a 706MKIIG, the other is an IC-735.
I have two power supplies, an Astron 20A (don't know what model).  The other
is a Pyramid Phase III, model PS-35. Actually, I now have two of them.

I am using a Gap Titan antenna.

When I connect either radio to the Astron power supply, they both work fine
on all modes, all bands at full power (150 - 200 W).

With either radio connected to the Pyramid power supply, I can transmit full
power, all modes on 10m.  But on 20m, I can transmit low poser (10 W) on the
735, but if I go up to about 20 or 30W or more, as soon as I press the PTT
on the mike (AM, FM, or key CW) or start to talk on SSB, the power supply
trips off line.  If I turn the power supply off and then back on, it works
again.

This behavior has been consistent since I setup the antenna.  I analyzed the
antenna and there is no problem with the antenna on any bands that I used.
As far as I can tell, this has happened every time I used the Pyramid power
supply.

My first Pyramid PS-35 finally died. When I turn it on, it immediately blows
the fuse.  I just borrowed another PS-35 and it behaves the way the first
one did, as described above.

Has anyone heard of a problem like this, or have any suggestions?

Karl
KG1L

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