There was a recent discussion about this on a forum I belong to,
especially comparing the LP100 to a Bird. The original article
describing the design of the LP100 (not 'A') by Larry said he calibrated
the meter with a Bird 4410. I asked Larry about his calibration
procedure on the LP100 (or LP500- can't remember) email reflector. He no
longer uses a Bird for calibration! So many hams (and CB'ers) think a
Bird is the ultimate in accuracy.... not so! However the Telepost meters
are not field instruments! Check recent posts in the reflector I
mentioned to see Larry's calibration procedure.
BTW, Ameritron/MFJ use an LP100 to calibrate their meters!
--
-de John NIØK
Don Wilhelm wrote on 5/20/2020 5:20 PM:
The Telepost LP100 (and I expect the LP700) are calibrated to NIST
traceable standards. I bought an LP100 kit (no longer in kit form)
and did my own calibration after construction - then sent it to Larry
for his real calibration.
Although Larry will not commit to it, I suspect the accuracy to be in
the vicinity of 2% or better.
There are a number of LP100s in the Elecraft working area. I don't
know how often they are sent back to Larry for a calibration check.
What I do know is that they are better than the average Bird used by
hams.
73,
Don W3FPR
On 5/20/2020 5:52 PM, Mark Goldberg wrote:
Hams tend to treat uncalibrated test
gear as gospel. An external power meter, just because it reports to the
nearest 0.1W isn't necessarily better. Any commercial operation
calibrates
on a regular cycle. Being a slightly less cheap Ham than most, I do
get one
scope / spectrum analyzer calibrated every year, so at least I have
something to compare the other stuff to.
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