<--------------------------------------------------------------PLEASE
VIEW FULL SCREEN OR THIS
WIDE------------------------------------------------------------>
NEW IN THE VERSION
5 ADVANCED MANUAL (Download Link Below):
IF you have a very new
IC7610 that came from the factory with 1.41 or 1.42 preinstalled,
it has already been calibrated at the factory, and none of these
adjustment procedures are necessary!
If
you have 1.4x pre-installed, there will be a DPD button on the MENU screen:
The latest Advanced
Manual Version 5 (<--same
as link above) which discusses DPD adjustments on Pages
38-41 is available on Icom Japan site and the newest Basic
Manual Version 5 is available on the Icom America site.
The vertical scale is 10db per unit and the reduction is
about 20db-30db which is very significant.
Below is a recording made with
a remote SDR receiver to listen to the transmitted signal:
With DPD ON practically no unwanted USB and with
DPD OFF, very significant
unwanted USB sideband splatter.
It would be possible to readjust
the IC7610 settings to reduce the unwanted USB with DPD OFF.
The demo is only demonstrating the effect with no other setting changes.
RECORDING WAS MADE WITH AMPLIFIER ON SO THAT PROBABLY ADDED A LITTLE MORE
DISTORTION.
IF YOU WISH TO INSTALL THE VERSION 1.4x UPDATE - HERE
IS MORE INFORMATION:
[Ignore if
you are not updating]
The DPD can be used with the IC7610 standalone (a.k.a. "Individual Mode")
to improve the purity of the spectrum, OR with the
Icom PW2
amplifier inside the feedback loop, but no way is known yet about how to
include non-Icom amplifiers inside the DPD feedback loop or even if it
will be possible at all. This would further improve linearity and
reduce IMD and splatter.
Download the 7610_14x.dat file
(same as link at top of this page).
Instructions for updating the firmware using the *.dat file are given in
the IC7610 Advanced Manual Version 5
( same as link above) on pages 95-98.
The installation adds a new menu item MENU->SET->DPD
ADJUSTMENT.
Pick "Single Adjustment" and open the adjustment screen.
NOTE: Adjustment must be into a dummy load OR a very low SWR antenna.
Using the UP/DOWN arrows at the bottom of the screen
(not visible above), chose a band and then push ADJUST. When it is
done it will say it was successful. Repeat for other bands. Exit by
pushing the EXIT (physical) button.
After the adjustments there is a new button "DPD" shown when you push MENU
and pushing it turns DPD ON/OFF.
In the PDF file the only instructions needed for the standalone
installation in the IC7610 which Icom calls "Single Adjustment" are from the top of the first page down to the sentence "If IC-PW2 is connected, remove it". Similarly, you need to disconnect any
amplifier and connect a dummy load before attempting adjustments.
You MAY be able to do the calibration with a low SWR antenna
instead of the recommended dummy load, but sometimes that fails, but using a
dummy load the calibration went smoothly.
Also with the dummy load you can go ahead and calibrate for all the
bands/frequencies shown even though you may not currently use those bands.
RECOMMENDED (by my friend and yours, "Justin Case") :
1.
If you do not have Version 1.3 on your SD card,
add that
before making this change in case you wish to revert back to 1.3.
Firmware Version 1.3 is
available
HERE.
2.
Also have an
up to date "Save Setting" file on your SD card of your current
1.3 settings BEFORE installing 1.42. See Page 62 of the Advanced
Manual and Pages 8.9-8.9 in the Basic
Manual.
3.
After installing 1.42 and
calibrating the DPD, add a new "Save Setting" file.
IMPORTANT: WHEN OPERATING DPD BE
SURE TO KEEP THE ALC WITHIN THE RED RANGE. See Note above about statement
on Page 41 of the new Verson 5 of the Advanced Manual or SEE GRAY BOX AT TOP
OF PAGE.
Anyone using RS-BA1 V2 with
an IC7610 who has installed the new IC7610 update to Version 1.4x which
adds Digital
Pre-Distortion (DPD) might like to know that there is an update
for RS-BA1 V2 to 2.6 which adds a control in the SET menu for
ON/OFF of the DPD.
The RS-BA1 update is
only useful together with the IC7610 update.
