K2 - bargraph reading OK?

[ON4WIX]

Hi all,

I just finished "Alignment and Test, Part II" on my K2 S/N 5361. All readings are well within spec and I've also quickly compared the receive on 40m to my TS-570DG. It's afternoon here so no whopping broadcast signals yet, but so far what I've heard with the K2 seems very promising.

I only have one question. When I disconnect the antenna from the K2 and put the RF gain to maximum, the S meter shows S7 while I would expect it to drop down to bottom scale. The meter has been calibrated during the testing of the display unit, all was well then. Connected to the same antenna as my TS570 the K2 shows around 20dB higher signal levels on the meter.
Should I recalibrate the meter? According to the manual recalibration is only necessary after changing the AGC threshold which I haven't done. I've only aligned the IF amp and the 40m bandpass filter as per the instructions on p64 of the manual. I do not have a signal generator here so if you're sending in any hints please take this into account.

Thanks for your help

Glenn ON4WIX
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[Don Brown-4]

Hi

When you calibrated the meter during alignment and test part 1 the receiver
was not functioning because it did not exist yet. Now that you have the 40
meter receiver working you will need to reset the calibration on the
S-meter. You would normally wait until the K2 is completed to do all of the
final calibration but you can do it at this stage if you want and then check
it at the final test and calibration.

Don Brown
KD5NDB



----- Original Message -----
From: "ON4WIX" <[hidden email]>
To: <[hidden email]>
Sent: Saturday, March 04, 2006 8:39 AM
Subject: [Elecraft] K2 - bargraph reading OK?


Hi all,

I just finished "Alignment and Test, Part II" on my K2 S/N 5361. All
readings are well within spec and I've also quickly compared the receive on
40m to my TS-570DG. It's afternoon here so no whopping broadcast signals
yet, but so far what I've heard with the K2 seems very promising.

I only have one question. When I disconnect the antenna from the K2 and put
the RF gain to maximum, the S meter shows S7 while I would expect it to drop
down to bottom scale. The meter has been calibrated during the testing of
the display unit, all was well then. Connected to the same antenna as my
TS570 the K2 shows around 20dB higher signal levels on the meter.
Should I recalibrate the meter? According to the manual recalibration is
only necessary after changing the AGC threshold which I haven't done. I've
only aligned the IF amp and the 40m bandpass filter as per the instructions
on p64 of the manual. I do not have a signal generator here so if you're
sending in any hints please take this into account.

Thanks for your help

Glenn ON4WIX
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[K3yt]

Hi,
 
You should have got the addendum(sp?) sheet to the manual.
 
It tells you to add after the steps on page 64 the note to return to  page
47 and re-do the AGC and S-meter.
 
73, K3YT
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[Don Wilhelm-3]

Glenn,

The manual statement is that CALS HI and CALS LO must be adjusted after
changing the AGC Threshold - the converse is not necessarily true - that is
not the only time that one should readjust the S meter settings.

One would need to reset CALS LO and CALS HI after any change that results in
a gain change on the K2 receive chain  prior to the AGC takeoff point - and
that is what happened when you added a working receiver and aligned the IF.
You may want to optimize the AGC threshold and reset the S-meter after you
have everything else correctly aligned.

73,
Don W3FPR

> -----Original Message-----
> Should I recalibrate the meter? According to the manual
> recalibration is only necessary after changing the AGC threshold
> which I haven't done. I've only aligned the IF amp and the 40m
> bandpass filter as per the instructions on p64 of the manual. I
> do not have a signal generator here so if you're sending in any
> hints please take this into account.
>
> Thanks for your help
>
> Glenn ON4WIX
>

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