In reading Gary Hinson's FT8 Operating Guide he says 'there is no need to work simplex' and should configure the Radio tab in WSJT-X Split Operation to Rig or Fake It.  I have the Rig set to "Ham Radio Deluxe" and when I set Split Operation to Rig WSJT-X (v2.2.2) crashes (shuts down).  I can set it to Fake It but I'm not sure exactly what that does.

I guess my question is with a FlexRadio Systems FLEX-6300 should I just leave the Split Operation set to None and just set my transmit frequency to a clear area with Shift-Left Click?

Also, since WSJT-X has been working just fine with the Radio set to Ham Radio Deluxe (which is the software I'm using) is there any reason I should change this to FlexRadio 6xxx setting?

Thanks,
-TAC

On Nov 22, 2020, at 10:47, Tom Crites <crites57@...> wrote:

I guess my question is with a FlexRadio Systems FLEX-6300 should I just leave the Split Operation set to None and just set my transmit frequency to a clear area with Shift-Left Click?

I don’t use HRD or Flex, so your mileage may vary. However, in most standard setups the difference between split and fake it is very simple. Split uses one VFO for transmit and the second VFO for receive. This requires most rigs to be in SPLIT mode. Fake It, on the other hand is even simpler. It uses the same VFO for transmit AND receive and changes the frequency of that VFO back and forth between those two modes.

I prefer and use Fake It, because I have other frequencies in the band registries of the other VFO. Just my preference.

Gary - AG0N

On Nov 22, 2020, at 10:47, Tom Crites <crites57@...> wrote:

I guess my question is with a FlexRadio Systems FLEX-6300 should I just leave the Split Operation set to None and just set my transmit frequency to a clear area with Shift-Left Click?

Tom,

If 'Fake it' is working use it. The User Guide in 4.2. Radio recommends:
Either method will result in a cleaner transmitted signal, by keeping the Tx audio always in the range 1500 to 2000 Hz so that audio harmonics cannot pass through the Tx sideband filter.

Without split mode you need to be very careful not to overdrive any transmission path audio related element for whatever reason, when operating below 1000 Hz audio frequency.

73, Reino OH3mA

With a Flex you don't need to use Fake It or Split.

Both on RX and TX you can open your filter width and TX band width really wide. I run my Flex with a TX band width of 8k, When using DIGU mode there is no equalization and no roll off due to TX width.

I've successfully worked stations on FT-8 that are + 6kc from the base frequency and received similar reports on the signal to those made closer in the normal TX bandwidth.

Mark - WS7M

On 11/22/20, 2:47 PM, "Gary - AG0N" <main@WSJTX.groups.io on behalf of mcduffie@...> wrote:



> On Nov 22, 2020, at 10:47, Tom Crites <crites57@...> wrote:
>
> I guess my question is with a FlexRadio Systems FLEX-6300 should I just leave the Split Operation set to None and just set my transmit frequency to a clear area with Shift-Left Click?


I don’t use HRD or Flex, so your mileage may vary. However, in most standard setups the difference between split and fake it is very simple. Split uses one VFO for transmit and the second VFO for receive. This requires most rigs to be in SPLIT mode. Fake It, on the other hand is even simpler. It uses the same VFO for transmit AND receive and changes the frequency of that VFO back and forth between those two modes.

I prefer and use Fake It, because I have other frequencies in the band registries of the other VFO. Just my preference.

Gary - AG0N

On Nov 22, 2020, at 10:47, Tom Crites <crites57@...> wrote:

I guess my question is with a FlexRadio Systems FLEX-6300 should I just leave the Split Operation set to None and just set my transmit frequency to a clear area with Shift-Left Click?

Tom,

If 'Fake it' is working use it. The User Guide in 4.2. Radio recommends:
Either method will result in a cleaner transmitted signal, by keeping the Tx audio always in the range 1500 to 2000 Hz so that audio harmonics cannot pass through the Tx sideband filter.

Without split mode you need to be very careful not to overdrive any transmission path audio related element for whatever reason, when operating below 1000 Hz audio frequency.

73, Reino OH3mA

Hi Tom, Mark, and Reino,

with an all digital Tx audio chain not using one of the WSJT-X split modes may be OK but I would agree with Reino. There is no need for a Tx bandwidth far greater than the bandwidth of the transmitted signal. WSJT-X will manage the tone frequencies and VFO frequency such that a narrow Tx bandwidth is no problem. You could even use a pass band of 1500 Hz to 2000 Hz, although that is unnecessarily narrow. Using a normal SSB Tx bandwidth and WSJT-X split operating ensures any audio harmonics, however the might be generated, to be greatly attenuated. Given the more complex VFO arrangement on the Flex Signature Series rigs "Settings->Radio->Split Operating->Fake It" would seem the best option.

73
Bill
G4WJS.