Fan Noise

HI David,

Reports on this are all over the map. The question is complicated quite a bit by the fact that Flex has had multiple PGXL firmware updates specifically focused on improving fan noise. So a particular commenter might be reacting to an older algorithm which been improved since. All of this along with the fact that there are three user selectable fan modes, each of which behave differently. And of course how hot the finals get depends on the power and mode you're using. Reports one way or the other often omit these and other critical details so it's hard to interpret them.

For me the fan noise situation has improved dramatically since I got my first one in 2019. It's much quieter than the Yaesu Quadra I had before but not as quiet of course as the tube amps I've had like the ACOM 2000a. Of course solid state amps always have significant fan noise. It's the nature of the beast. And for what it's worth, the ACOM 2000a made a terrible racket changing frequencies and bands where the PGXL only makes a few relay clicks doing so. By the way, when used with Flex stuff (radio, tuner, switch) it's connected and controlled by one Ethernet cable so you can place it some place where you can't hear it at all.

One last thing, the PGXL has three different fan groups (LDMOS FETs, harmonic dump and power supply) each with their own fans and control loops. They come on at different times depending on what's going on. Each sounds different and my take from reading comments is that people are more or less sensitive to particular fan sounds or pitches.

Bottom line is, assess comments on this carefully. You really should try to use one yourself before deciding what you think. I think Flex has a 30 day return policy so you could try it out and send it back if you don't like it but of course verify that before ordering !

Good Luck ! Russ KR6W