Most any Tektronics or HP scope, even if old, will hold its calibration,
particularly the vertical, for a long time if it has been treated well.
I have a very old Tek 422 which I had a chance to have calibrated for
free a couple of years ago and it was essentially within 2% or less on
all ranges after many years. If you have a scope, or have access to
one, you can measure the P_P voltage across a good DL and do a little
arithmetic. I'd measure the DL first, my old Cantenna measured almost
90 ohms after 25 years. [:-) An old Bird came in at 54 ohms.
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
On 7/19/2018 3:40 PM, Peter W2IRT wrote:
I'm good with about a 10% error (on the cautious side), and since I'm a
contester, I want to ensure I'm never over about 1425 Watts when I'm competing.
The Alpha 4510 was supposedly calibrated to known standards as well (for $1150
new it darned well better have been). I can live with it reading a tad high.
However I was hoping to sell it to help fund my upcoming KP-1500 purchase, but
the TX MON doesn't seem to be the solution, which is most unfortunate. I love
what it does, but the accuracy is a problem.
- pjd
-----Original Message-----
From: Don Wilhelm [mailto:[email protected]]
Sent: Thursday, July 19, 2018 6:35 PM
To: Peter Dougherty; [email protected]
Subject: Re: [Elecraft] Calibrating the P3 Station Monitor?
Peter,
Realistic instrument errors are up to 20% - check the ARRL Product reviews.
It just seems your Alpha meter is off in one direction and the TX
MONitor is off in the other direction.
See if you can borrow an LP100 wattmeter which has been calibrated by
N3LP to NIST tracable standards. That will provide you with an up to 5%
error. Larry is reluctant to specify the error any closer than 5%.
In this age of digital displays, we have a tendency to believe that the
display is accurate down to the last displayed digit. More often than
not, that is not true.
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