FT8 Mode I cannot transmit above 2700 Hz

First let me say I did a search and didn't find anything on this, so if there is I am sorry.

I have never been able to transmit a signal above 2700 Hz using FT8 mode. Using an ICOM 7300, I have checked everything I can think of. I see others that can work stations above 2700 so I'm pretty confident I should be able to too. I have changed the filter settings but nothing seems to work. There is a receiver bandwidth setting in WSJT which I've set to 3400 Hz but no change with that either.

I suspect it is a 7300 setting but I cannot find it, FT8, 100 Hz to 2700 Hz, any band, works as it should. Anyone have any idea what the problem might be?

Cheers,
Paul WBØZRD

 

It’s you TX bandwidth. I’m not sure if it’s adjustable on that model. My 7200 doesn’t modulate well over 2500 Hz. If I want to go up that high on the waterfall, I have to turn the VFO.

 

Turn the VFO knob to the right until your desired frequency is within your passband.

 

Turn the VFO and then make sure another mode isn't presently operating there before you transmit. Other modes exist above and below the default FT frequencies.

 

The 7300 when in USB-D mode is limited at 2700 I believe

 

Ok, running the VFO up a couple hundred hertz will work but I believe there is another problem somewhere else. Even with the filters set to 2900 Hz which is as high as they go I can push a tone into the microphone as high as 3000 Hz before the transmit power falls off. Certainly is a mystery I'll keep looking Thanks!

 

Well that would certainly explain it. When the radio is in just USB mode one is able to select the transmit bandwidth but when you add DATA to it that option goes away...I would suggest that you are correct.

 

If you are using WSJT-X, turn on RIG for Split, under Radio, in Settings.

 

In the first firmware release, yes but this was fixed in subsequent versions.

Update to the latest firmware.

Frank

 

I'm confused. Why would you want to transmit above 2700 Hz? That would put you out of the passband of most receiving stations...