Paul and the group,
Sorry for the out of sequence stuff, but I have been away for a week.
ARRL Lab test equipment is calibrated according to the manufacturer's suggested
calibration schedule. In most cases, the term is one year. In a few cases
(such as with the RF signal generators) the term is two years. Calibration is
NIST traceable, done by a certified lab in the Boston area (Essco labs, for the
curious).
The budget here is such that equipment purchases are rare indeed. However,
there was a slight difference in test setups between the original K2 review and
the Orion. One of the signal generators for the K2 review was an HP 8640B. It
was replaced a couple of years back by an IFR 2041 (same as the Marconi of that
model number). The only other item purchased in the interim was a digital
storage scope (early this year), but that has no role in receiver testing.
Realistically, much modern test equipment does not require any adjustment in a
multiple year time span - at least the cal lab reports I have on file don't
indicate such a need on the critical pieces used in receiver testing.
73, Michael Tracy, KC1SX
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