With no antenna attached do you see 0-3 volt range on the U3 side of
R22 on the subRX board as you vary the RF gain from min to max? This
would be the far end of the gain process.
73, Guy
On Sun, Oct 24, 2010 at 7:48 PM, Mike Scott wrote:
> Further to the issue that my K3 RF gain on the sub Rx
Mike Scott-7 wrote:
>
> To the person who has weird main receiver RF gain action the test I did
> could help you determine if it is the Pot.
>
Thanks, Mike, I'll do the same measurement and see what it tells me.
Erratic behavior seems most likely due to a bad pot, but, as Sherlock would
say,
Stan Gibbs wrote:
>
> Thanks, Mike, I'll do the same measurement and see what it tells me.
> Erratic behavior seems most likely due to a bad pot, but, as Sherlock
> would say, theorizing without data is a capital mistake.
>
Sherlock was right; it wasn't the pot. The behavior of the voltage on
Hi,
Have you tried to redo the calibration on the erratic subreceiver? It's now
been a long time since I did this, but I had to do mine three times before
it came out right. The 2 first times I had a dead zone like you do. It's
very important to make sure the frequency is spot on as the instructi
ab2tc wrote:
>
> Have you tried to redo the calibration on the erratic subreceiver? It's
> now been a long time since I did this, but I had to do mine three times
> before it came out right.
>
Hi Knut,
Actually, the main RX is the one giving me trouble, not the Sub; that was
Mike's issue. I w
In the process of investigating this further, I tripped over a very nice
diagnostic tool: the Config menu's "SW TEST" entry. This option can be set
to "SCN ADC" to allow monitoring of the 4 potentiometer inputs to the PIC
processor ADCs. This allows one to verify the range and linearity of the
pot
Hello folks
Interesting to note non-linear RF gain control.
Same thing here on the main RX.
Scn Adc check is spot on.
Approx 10o'clock position jumps to % 100.
Sub RX is ok.
cheers
Paul b
zl1ajy
3058
--
View this message in context:
http://elecraft.365791.n2.nabble.com/K3-Rf-gain-tracking-m
Stan, I dunno if it may be related, but I recently had a dead spot in the RF
gain
encoder. It was recommended that I do a recal (using 20M) with the XG2 and
V1.3.10.15
of the utility. An earlier version had a bug where the settings were not saved.
Cured
my problem.
GL & 73,
Mike NF4L
> Actu
paulb wrote:
>
> Interesting to note non-linear RF gain control.
> Same thing here on the main RX.
>
Nice to know that I'm not the only one seeing this! Thanks, Paul.
Here's some more data. Perhaps someone can illuminate us on what it
indicates.
With my XG2 on 20m, and adjusting the main RF
Have you done as has been recommended several times during this
thread? - use the latest K3 Utility and run the RF Gain Calibration.
First do the "set to defaults", and then run the calibration with a
signal generator having a controlled output level. Follow the
instructions and be certain
Don Wilhelm-4 wrote:
>
> Have you done as has been recommended several times during this
> thread? - use the latest K3 Utility and run the RF Gain Calibration.
> First do the "set to defaults", and then run the calibration with a
> signal generator having a controlled output level. Follow
After reading all comments, I performed an RF calibration using a -73dBm
source and the K3 Utility 1.3.10.15. First run with factory defaults, second
run using my signal source. A picture tells more than a lot of numbers:
http://home.datacomm.ch/hb9brj/RFgain.jpg
X axis = RF gain position angle i
Very nicely done, Markus! Exactly what I observe.
-
73, Stan - KR7C
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View this message in context:
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Sent from the [K3] mailing list archive at Nabble.com.
_
> Contrary to my earlier statement my K3's main RX does show an RF gain
> non-linearity.
I certainly don't see any non-linearity here in either the K3 or KRX3.
Using your "angle" references (RG/RG$ are the RF Gain values reported
by the CAT protocol):
--- MAIN -- KRX3
Joe,
I get essentially the same numbers as you show IFF I use the factory default
calibration values. If I use my XG2, I get the Markus curve. Maybe my XG2
is defective? There is some unidentified cause for this behavior, since it
is both repeatable and reproducible, and I sure would like to u
Stan,
> If I use my XG2, I get the Markus curve.
My values are using the XG2 for calibration.
> There is some unidentified cause for this behavior, since it
> is both repeatable and reproducible, and I sure would like to
> understand it.
Lyle is apparently trying to duplicate and then find
Joe,
Yes, I've been in touch with Lyle; he is trying to understand this issue and
resolve it, for which I am very grateful. Perhaps the solution will
illuminate why some observe this behavior and some do not.
Where else but Elecraft can one find such truly outstanding support?
-
73, Stan -
.net] On Behalf Of Don Wilhelm
Sent: Tuesday, October 26, 2010 8:26 AM
To: Stan Gibbs
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 Rf gain tracking (main vs. sub)
Have you done as has been recommended several times during this
thread? - use the latest K3 Utility and run the RF G
with
> them.
> 73,
> Gary
> N6LRV
>
> -Original Message-
> From: elecraft-boun...@mailman.qth.net
> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Don Wilhelm
> Sent: Tuesday, October 26, 2010 8:26 AM
> To: Stan Gibbs
> Cc: elecraft@mailman.qth.net
&
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