[K3CAL] Power Supply Problem

[Wa4prr]

Sounds like RF bypassing is insufficient on the Pyramid supply.  Try bypass caps on the input and output of the supply.  (See the ARRL handbook for how it is done, if needed.).  73,

Ron Byzet / WA4PRR - Sent from my iPad

On Jun 10, 2015, at 8:04 PM, Karl Long <karl_g_long at hotmail.com> wrote:

> 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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