Technical information

Conclusions
 The oddball hybrid frequency display is amazingly accurate and linear, end to end, on each
segment – better than all my vacuum tube Collins gear. Also, one can QSO instantly to CW
segment without have to crank the dial forever.
 The receiver audio is amazingly clean and smooth and fun to listen to. Now my KWM2-A and
the Temp0 2020 are my top shelf listening smoothies.
 The transmit audio gets excellent reports with the stock Tempo mic and ever better with a D-
104.
 AM operation is exceptional if you lower the carrier to 10-20 watts and drive an amplifier. I am
seeing 100% modulation and HiFi 16kHz bandwidth. You have to use RIT on receive since the
USB SSB filter is used on receive vs. a proper AM filter. I am looking into using both SSB filers
on receive but this might not be possible impedance wise and too messy of a MOD.
 This is an extremely well done design and a keeper for sure. My Collins HF-380 had some
mechanical design flaws they could have learned from with this old puppy.
 I am seeing around -350 Hz drift in the initial 30 minutes. It then stabilizes but never totally
stops, just slows way down.
 The external VFO drifts -310Hz in the first 30 minutes then stabilizes with substantially less long
term drift than the internal VFO as one would expect. The factory specification calls for up to
100Hz per hour after warm up so this is not too stellar to start with but – it is a geezer after all
and the application of the X-LOCK unit stops all drifting cold so definitely worth the effort.
 The SSB carrier null is the best I have ever seen, >70DB, possibly due to the dual SSB filters
with no compromised required on null settings.
 The separate LSB and USB filters enable absolutely the same audio response on LSB and
USB.
 The PA cage blower keeps the internal chassis temps nice and cool. It’s relatively quiet, not
bad.
 The noise blanker is one of the best I have ever used.