Hi again,
As a few people pointed out, I misspoke in my earlier email.
When I calibrate C22 I immediately run CAL PLL and CAL FIL.
True, the K2 does not directly reference C22 during normal
operation. My calibration of C22 and then CAL PLL and CAL
FIL is all by-the-book.
That being said, I
Adam,
You cite 70 to 80 Hz drift from a cold start. That is within the K2 spec of
100 Hz drift typical from a cold start at 25C (77F). If your ambient
temperature is lower, you can expect more warm-up drift.
Once warmed up, the drift should be small.
Even my stable HP6840 takes about 2 hours
Adam,
The K2 PLL Ref Upgrade manual gives some information on typical drift i.e.
5 to 20 Hz per 15 degrees F on 20 meters. It also explains how changing RA
on the thermistor board can better compensate for the drift. Since your
drift is consistent, I think you should be able to reduce it by
Kevin,
The RA resistor on the thermistor board is intended to compensate for drift
AFTER warmup - such as drift that might occur due to the additional heating
when the KPA100 is transmitting. I do not believe it would be fruitful to
attempt to compensate for the initial warmup drift that one may
: Sunday, December 24, 2006 2:26 PM
To: Kevin Schmidt; elecraft@mailman.qth.net
Subject: RE: [Elecraft] K2 frequency drift
Kevin,
The RA resistor on the thermistor board is intended to compensate for drift
AFTER warmup - such as drift that might occur due to the additional heating
when the KPA100
Don,
I agree about warm up drift. Perhaps I misunderstood Adam, but I
thought that his problem was that even during normal usage he found
objectionable drift when he operated his KPA100 for a while. I presume,
perhaps wrongly, that this is most likely coming from the PLL since I
thought that the
On Sunday 24 December 2006 15:26, Don Wilhelm wrote:
Kevin,
The RA resistor on the thermistor board is intended to compensate for drift
AFTER warmup
In 1978 I bought an Eddystone EA12 from Tom, G3YTO,
sadly SK in 1985. It used to keep my bedroom/shack
warm - thermal stability, and the glow
The K2 drift mentioned by Adam is about 5 ppm for 10 MHz WWV. This isn't
bad for a non-TCXO oscillator. With TCXO oscillators, you can probably get
down to 1 ppm, but it might cost you $50 extra. You can do even better by
mounting the oscillator in an oven (OCXO), but it will cost you a
Two questions for the group:
1. My K2, serial 5120, has worked flawless since I built it last fall...except
that about a week ago, friends on a 20m net I work daily said I was low about
40 Hz in frequency. (Frequency calibration checked occasionally against both my
external counter and WWV had
Dave,
It is not abnormal for electronic equipment to have some warm-up drift, the
K2 is no excpetion, so I would hesitate to call the situation you describe
as a 'problem'.
You can download the K2 Temperature-Compensated PLL Reference Upgrade
document from the Elecraft website - it contains a
KI6WX
- Original Message -
From: [EMAIL PROTECTED]
To: Elecraft@mailman.qth.net
Sent: Wednesday, March 15, 2006 1:58 PM
Subject: [Elecraft] K2 frequency drift
Two questions for the group:
1. My K2, serial 5120, has worked flawless since I built it last
fall...except that about a week
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