PGXL how hot is too hot?

W3US

I just opened a ticket with Flex, but of course it happens to be Friday, just after closing time, so I am posting here just to get some ideas between now and Monday.

 I've only owned this PGXL for ten days and just noticed it is running hot - 50-60 degrees, even though I am on 120V and only pumping 600W. This is on SSB and CW, not digital/full duty cycle. Last night I fished out the "final QC passed" sticker which appeared to be blocking the air intake. I never noticed the sticker before, so assume it must have come loose in packing/shipping from it's intended location on the front of the amp. Anyway, 50-60 degrees seems pretty hot for 600W.  I have adequate spacing front and back of rig. I only noticed this in the last couple of days, but cannot say for certain if the amp has been hot from the start or this is something new. 

F/W is current - 3.5.23. Any ideas?

Rusty - W3US

TxPres W5PD

Try checking Meffa Enabled on the "Other" tab in the configuration menu.
I find that my PGXL runs a lot cooler when enabled.

W3US

Yes, Meffa is enabled. Thanks.

David Decoons, wo2x

On SSB mine gets to mid 50s. I have not seen it higher than 58, even when the few times on FT8 at high power.

It cools down very quickly.

Dave wo2x

KM4CQG

Rusty

What Fan mode do you have selected ?

On FT8 I seldom run more then 10 watts in and nets me 225 watts out and run the Fan on quietest setting.

I do on longer Key downs see temps in the Mid 50s on SSB but amp cools very quickly.

Regarding voltage I am running 240 into my Amp.

Ian

KM4CQG

W9WLX_Chuck

It will run a bit warmer in AAB mode (used for SSB). Mine runs around 50 for conversational SSB at 600-800 watts on 240v. The rise is slower in AB mode (CW, Digital) but the harmonic load temp rises faster. That is pretty much what I would expect. MEffA is not available for SSB and AM mode. It functions only in AB mode but the display would lead you to believe that it works in both modes.

Chuck, W9WLX

Mike-VA3MW

@w3us

When you get to 80C or so, then, start to look into your cooling.

50-60C is normal regardless of your source voltage. And, you are limited to 500 watts or so about 120VAC input.

73