A quick update on my IM measurements for the ICOM IC-7610 with the new Version (V1.42). This Version is the third installment for the '7610 and this one has the I&Q output fixed. I've not tested this but I believe that quite a few forum members have done so and are over the moon.
Here are a few IM measurements I made after the Firmware upgrade.
TRX: ICOM IC-7610
SPECAN: SDR-IQ
SOFTWARE: SpectraVue 3.44 Beta 0
TRX Power: 35W
The above shows the output without DPD. About 23dB
NOTE: This is 6db below PEP.
Here we see the same two tone signal with DPD enabled, a nice 54dB down on IM3 and all other IM products are below -140dB. Again, this is 6dB below PEP. So pretty darn good if you'll ask me.
And so the question remains, is it worth to enabled DPD even if we would use an amplifier? I'd say definitely. Using an Amplifier with a much cleaner exciter would give you a cleaner signal (yes yes it depends on a few other things but hope prevails ....)!
Remember GIGO (Garbage in = Garbage out)! This is also true for RF amplifiers not only for Computer Systems.
Nice going ICOM.
See the below pictures how my signal looks over the air. Solid state Amp and DPD enabled.
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