With RIG Split the FTDX101MP always use's SUB VFO for TX, and it is
easily selected for TX for other TXCR use besides wsjtx.
"Transmit in SUB only happens in full-duplex satellite modes, otherwise
SUB is only a second receiver." is not true for
the FTDX101 at least. SUB is designed to do all TXing when offsets are used.
This is why I use commander software to allow the PC cat connected SPE
amp to CAT read the SUB VFO frequency,
as it needs to monitor TX frequency to set SPE ATU as needed before keyup.
VSPE splitter allows wsjtx and commander to share the enhanced comport
source CAT virtual port with room for another 2
programs to share (4 total).
One receiver VFO can be assigned a A and B VFO profiles switchable and
for split operation,
whereas with two independent receivers, Main and SUB, the SUB VFO is
assigned the VFO B job,
but retains its SUB VFO name, but it could also be called VFO B.
vk4tux
On 5/4/21 2:31 am, Bill Somerville wrote:
On 04/04/2021 17:19, Claude Frantz wrote:
On 4/4/21 3:18 PM, Black Michael via wsjt-devel wrote:
Hi Mike and all,
You find "VFOs.txt" in the main hamlib directory that tries to
describe the abstraction.The differences are rig-dependent along with
rig mode.
It was exactly the contents of this file which has triggered my
question.
Life isn't simple....:-)
Oh yes ! You are right. But my question remains open: What is the
difference between a VFOx and a subVFO ? Is it simply a matter of
definition or is there a difference in the function too ?
Claude (DJ0OT)
Hi Claude,
some rigs like the IC-910 and IC-9700 have two separate receivers MAIN
and SUB, each have a VFO A and VFO B (used for SPLIT mode for
example). They also use SUB as a pseudo VFO B when used in full-duplex
mode for satellite operation.
Other rigs have MAIN and SUB receivers which are also used for SPLIT
mode. These rigs usually (always?) cannot transmit using SUB unless in
SPLIT or full-duplex mode.
VFO A and VFO B where present are mostly indistinguishable, although
there are exceptions to this as some rigs only transmit on VFO B and
that is only when in SPLIT mode, i.e. they have no VFO B receive
capability.
I suppose MAIN and SUB means two independent receivers, whereas VFO A
and VFO B are just software concepts mapped onto a single receiver.
Transmit in SUB only happens in full-duplex satellite modes, otherwise
SUB is only a second receiver.
MAIN and SUB can usually be exchanged just like VFO A and VFO B can.
73
Bill
G4WJS.
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