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The vfo stability of ATLAS-210 is far to be good  compared to present standard .There is a drift in frequency  until the vfo reach its thermal steady state  and there is also an instability if the power supply voltage changes .In the past where nobody was operating digital mode this was not a problem but now it is a different story .The frequency drift due to thermal change is almost negligible if you  start your ATLAS 30 minutes before really transmitting .The drift in frequency du to poor voltage regulation of the VFO power supply can be reduce  by changing the voltage regulator circuit .One description appeared in 1977 in Ham Radio Magazine .It was in fact a modification  for ATLAS 180 but it can be also adapted for ATLAS 210 .You will find below a scanned copy of the article . VFO modification
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