On 04/05/2015 04:01, jeff millar wrote:
Hi Jeff,
<snip>
* The 9100 has a Data Mode that can have a different Rx bandwidth
from SSB mode
o I set data mode to 3.6 KHz to see some of the JT9 band
(without making SSB mode too wide)
The widest IF filter on the IC-9100 is 3 kHz, you can move that
around all of the 4 kHz of JT65 and JT9 sub bands by using the TWIN
PBT as an IF shift control.
Good point about moving the passband tuning. BTW, it appears the Rx
passband extends to 3.6KHz when set to 3.6 KHz width and moved up 300
Hz with PBT
The IF filter width is probably specified at -6 dB points and the
default with the PBT controls centred claims to be from 600 Hz to 3.6
kHz. 600 Hz does seem a rather high HP edge but perhaps the filter has
fairly soft characteristics. I use an Icom 756 with a similar PBT
control arrangement but with a 2.7 kHz IF filter and find it is not a
serious handicap even operating JT65 + JT9.
<snip>
* Transmitting USB sound may have the level too low
o With default USB mod level at 50%, the Pwr slider had to go
all the way up
The "Tx Pwr" slider is intended as an attenuator, all the way to the
top is 0dB and is the default setting.
o With USB mod level at 100%, the Pwr slider backed off to the
1.5 ticks below max
Set the "Tx Pwr" to the top and adjust the rig's MOD level to give
required output i.e. just into ALC at full power. Use the rig's RF
POWER control to set your output between 2W and maximum, if you
require less than 2W output then resort to the WSJT-X "Tx Pwr" slider
to reduce further.
Ok, I understand. I set the slider to max, set power output to max by
the USB Modulation Level. But the slider is extremely touchy.
Backing off 3 dB is 1/4 of a tick.
You can get finest control of the "Tx Pwr" slider by selecting it with a
mouse click, then moving up and down with the up and down arrow keyboard
keys. Page up and down give coarser control.
I have noticed that the range and linearity of the "Tx Pwr" control is
somewhat system dependent, I'm not sure if this is an operating system
difference or a factor of the sound card type.
thanks,
jeff, wa1hco
73
Bill
G4WJS.
------------------------------------------------------------------------------
One dashboard for servers and applications across Physical-Virtual-Cloud
Widest out-of-the-box monitoring support with 50+ applications
Performance metrics, stats and reports that give you Actionable Insights
Deep dive visibility with transaction tracing using APM Insight.
http://ad.doubleclick.net/ddm/clk/290420510;117567292;y
_______________________________________________
wsjt-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/wsjt-devel
