Here is more info on the the performance of the W2A after the mod.
Well folks I have had my IC-W2A for one week now & am,needless to say
suitably impressed. But now my comments...
Why did Icom have to change the DC input socket to what the W2A has.
It is very unusual & as far as I can find out, Icom are the only people who
can supply a plug for it. I think they should have stayed with the more common
2.1mm DC jack as per the IC-32AT.
I did some checks of the receivers using an IFR 500A signal generator
& the following is what signal level I needed to get 1 "S" point on the W2A's
70MHz, 1mV (milli-volts)
100MHz 75µV (micro-volts)
From here to 170MHz less than 0.2µV
250MHz 0.5mV (whats going on here???)
320MHz 5µV (changed to UHF main VFO from here on)
400 - 450MHz less than 0.35µV
465 - 510MHz less than 1µV
520 - 690MHz less than 2µV
700 - 999MHz varies from 7.5µV to 2µV, dips to 0.35µV at 900MHz.
Quite impressive, but I would really like to get better sensitivity
at the 70 - 80mhz end. Studying the circuit diagram shows bandpass/bandstop
filters all over the show, so maybe its possible to modify a few to increase
I am gathering together the ciruits of the Icom IC-R1, IC-24AT &
W2A to compare the front ends so we will see what comes of this experiment
in the near future.
One other worry was the on/off switch, how do you turn the set off
when the battery is flat. I am concerned about running the battery to zero
volts, hopefully this does not occur. I have been disconnecting the battery
when charging to prevent anything funny happening.
The antenna supplied with my W2A is an FA-1443BB, whats the difference
between this & the FA-1443B, & the FA-4B supplied with an IC-R1.
One more gripe, I dont like the plastic plug/covers over the DC jack,
headphone, external speaker sockets, they should have been rubber as per the
IC-32AT, as I can see already that they will not last very long after prolonged
use. Boy what a moaner, you say, small complaints but this would really have
made it the best. I wonder what Yaesu & Kenwood are going to do to compete