Steve --

On 5/19/2020 00:15, Stephen VK3SIR wrote:

Does the "Allow Tx Frequency Changes While Transmitting" (File/Settings/General 
Tab) when not-checked function as intended?

Yes. When this option is not checked, frequency-changing CAT commands will not be sent to your radio.

My expectation would be that if disabled that any frequency changes observed in 
the Tx spin-box widget on the Main Window should be delayed until the end of 
the cycle and should not be immediate (or perhaps these boxes disabled until 
the end of the cycle) under this circumstance.

Here's the User Guide statement about the option "Allow Tx frequency changes while transmitting". You'll find it here, in Section 8.1:

http://www.physics.princeton.edu/pulsar/K1JT/wsjtx-doc/wsjtx-main-2.2.0-rc1.html#VHF_SETUP

"If you will use automatic Doppler tracking and your radio accepts frequency-setting commands while transmitting, check *Allow Tx frequency changes while transmitting*. Transceivers known to permit such changes include the IC-735, IC-756 Pro II, IC-910-H, FT-847, TS-590S, TS-590SG, TS-2000 (with Rev 9 or later firmware upgrade), Flex 1500 and 5000, HPSDR, Anan-10, Anan-100, and KX3. To gain full benefit of Doppler tracking your radio should allow frequency changes under CAT control in 1 Hz steps."

        -- 73, Joe, K1JT


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