[Elecraft] K2 Alignment and Verification of Specifications

[pc5m, Carel]

Just measure this:

TX: 28.400, 10W
 
Spurious found at 27.317 MHz approx 30-40 dB down !. This spur is coming
from (I think) 2 * VCO - 4 * IF (2 * 23.485 - 4 * 4.915)
It depends a lot on the power control setting, if you go above 10W it will
increase a lot and below 10W it will get better, but still at 1W output only
50 dB down. This spur can't be attenuated by the BPF because it can become
very close to the carrier.

Gl,

Carel. 

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Jurgen ON5MF
Sent: Saturday, December 30, 2006 2:55 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K2 Alignment and Verification of Specifications

Mmm, not really sure about that any more... as stated a few days ago I 
have seen the signals transmitted by my K2 (SN 5549) and I'm not really 
happy with them (especially on 10-12 and 30m).

Anyhow, in a few days a friend of mine with (semi-) professional  will 
try to tweak the filters to see if we can improve on that.

Am I one of the only ones who is also interested in the purity of the 
transmitted signal and not only in the quality of the receiver?

Chuck Guenther wrote:
> As Don, W3FPR has already pointed out, alignment of the K2 is
straightforward and requires no test equipment.  By following the
instructions in the manual, as well as the frequency calibration info
provided on Don's website, my dial calibration is now accurate within about
20 Hz, using WWV as a reference.  I calibrated my BFO frequencies by ear,
using on the air signals. When I have an opportunity to check them using
Spectrogram, I expect this will only serve to verify the settings I have.
>
> The most difficult part of the alignment involved the peaking of the
various inductors-- only because it was an iterative process.  My K2 is
receiving at least as good as, and on some bands, better than my Omni 6,
Option 1.  Pardon my owner's pride, but I really don't see how a factory
alignment by Elecraft could improve my K2.
>
> I think my experience demonstrates just how well designed the K2 and its
supporting documentation are.  People told me how good the K2 was, and
everything they told me was true! 
>
> 73,
> Chuck  NI0C 
> K2 s/n 5853
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-- 

73

Jurgen Geldhof
ON5MF

on5mf at ktk.be <mailto:on5mf at ktk.be>

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