TunerGeniusXL 1x3 powered off state

K5CG

I have this tuner and haven't been able to figure out what state it might be in when powered off.

Turning off the power prevents you from keying the Flex for some seconds (maybe 30) with an indication of "Interlock is preventing transmission AMP:TG". OK, that goes away soon.

But when you key the transmitter it doesn't appear that the RF goes anywhere. Furthermore, the transmit power drops continuously and there is no SWR at all.

My antenna is on port 1. RX signals go away compleletely so I know it is disconnected. I have a dummy load on port 3 and it has some SWR (predictable) but that is also not what I am seeing here.

I see no mention of this in the manual. One might expect it would go into bypass on port 1 by default.

Q: What output port of the TGXL (1x3) is connected to the transmitter when the tuner is powered off?

Thanks

Danny

Cross posted from FlexRadioSmartSDR@groups.io

WX7Y

If it's the same as the 4O3A antenna switch's are designed It is a feature ALL ports are grounded when not in use I can't remember if the Radio bort is grounded or open circuit but I know the Antenna ports go to chassis ground.

K5CG

Now I have my answer. After moving my antenna around from port to port with the TGXL power off it is clear that NO PORT is connected to the radio.

Is this a bug or should it be a feature request?

K5CG

Hi Bret,

I've owned a few tuners over the years, and never have any of them block RF when there is no power. Maybe you want all the ports to be grounded and maybe you don't. It would be nice to have the option.

I tried to post on 4O3A's community forums but could not submit the message even after completing the CAPTCHA. "Invalid Keys" error, so I've opened a ticket with them with some questions.

It might go nowhere.

Thanks

Danny

ka9ees

@K5CG I have a 1x3 and am quite happy with it not passing RF when powered down. My Palstar HF-AUTO did the same thing.

W7NGA

Odd that you don't see an infinite SWR on CW or TUNE transmit initially, as the Antenna port is not connected.

W7NGA

K5CG

@W7NGA Odd indeed. No SWR indication at all.

@ka9ees I just sold my Palstar HF-AUTO (the older 1500 W version) and it absolutely did pass through when the power was switched off. Maybe yours was different.

I opened a ticket with 4O3A and they said that the TGXL does not pass through when the power is off and that the hardware is not capable of it. But they understood the risks (potential damage to a transmitter) and liked the idea and would take it into account for a future version.

That's the answer. I just don't want to believe it. SMH

w2hx

it would be great if you can define a "default off port." for example, maybe someone wants RF to go to a dummy load when it is "off" or GROUND as selected by the user