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PGXL Fault

This could be related to the PGXL clicking, aka thermal expansion/contraction between 60C and 70C warm up/ cool down cycles. After moderate use chasing DX during yesterday's 6 meter EU-NA opening, this morning my PGXL tripped while I made a transmission. Yesterday I ran mostly around 1 KW with no issues. Today, I immediately saw a High SWR Alarm flash up on the app.

After I checked the SWR on my T11 Log Periodic with the F6600, SWR looked normal, around 1.6:1 on 6 meters. No further alarm info displayed, other than the "chart" which I have attached. However, the amplifier is now in a state of a quick key up with a fast shut down. No power out! No alarms displayed in the app or front panel. The F6600 works fine in the "Standby" (bypass) mode. I shut down the amp and also unplugged it from the 240 vac, but no reset of the fault. I turned Meffa off and tested, no change. I forgot to put the amp in Standby overnight, so the Vdd remained at a level above zero as shown on the chart, but don't know if that is relevant.


  • Mike-VA3MW
    Mike-VA3MW Administrator, FlexRadio Employee, Community Manager, Super Elmer, Moderator admin

    @Bill NE1B

    The PGXL is very very fast. So, when some baluns heat up and they change their value, it is possible to trip. BTW, even if you test your antenna after an event the Core in the balun will have cooled off and what you measure will be different.

    It is not related to any thermal expansion at all. The thermal expansion is something that is planned for and expected. Also, when they are testing, the PGXL is worked much harder then you or I would even on 6M FT8.

    Leaving your amp in operate overnight will also not cause an issue. It isn't that fragile.

    I will open a support case for you.


  • Bill NE1B
    Bill NE1B Member ✭✭


    Support case is open. I have tested with 300 watt level into an RF load and several different antennas. It does not seem to be a balun issue. The T11 Log Periodic also uses a coax choke. The same result. With 30 watts drive, the amp keys up and displays 100 watts momentarily on the Utility (and Front Panel), for 2 msec., then shuts down, even though the PTT (in PGXL) is still red. I then de-key. No Alarms are displayed in the Utility or Front Panel. I have eliminated all jumper cables (RG-213) to the various loads with new cable, totally bypassing the Antenna Genius. I am thinking that a relay is dropping out. Yes, I have done a Factory Reset, per p.38 of the PGXL manual (3 times).

    73, Bill

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