Calibrating RX on the K144XV

[RANDY DIDDEL]

Hi all,

I have recently installed a K144XV in my K3s.  From the factory, the offset value in the lower part of the band is +3.29 however, I tune into the Beam Spinner’s net every morning here in the Denver area on 144.200 however, with the factory recommendation, I have to tune 144.199.75 to hear stations clearly.  Tuning the K3s’s VFO to 144.200, I have to change the offset to about +3.59 and then everyone sounds good and are ‘on frequency.’ There are several stations with have 9700’s so I would think they would be bang-on.

So, should I set the offset by ear, should I recalibrate, or ???  I do own an XG3 so if I knew how to properly calibrate it, I could go that way too.

Any help is appreciated!

73

K5RHD

/randy
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[Michael Walker]

Hi Randy

I used to own the 144XV and yes, it was off frequency with no way to
actually tune the actual transverter.  I actually did add a GPSDO for a
reference that helped.

Next, it drifted all over the place.

So, to answer your question, yes, this is normal.

Mike va3mw


On Wed, Jul 15, 2020 at 10:38 AM Randy Diddel <[hidden email]> wrote:

> Hi all,
>
> I have recently installed a K144XV in my K3s.  From the factory, the
> offset value in the lower part of the band is +3.29 however, I tune into
> the Beam Spinner’s net every morning here in the Denver area on 144.200
> however, with the factory recommendation, I have to tune 144.199.75 to hear
> stations clearly.  Tuning the K3s’s VFO to 144.200, I have to change the
> offset to about +3.59 and then everyone sounds good and are ‘on frequency.’
> There are several stations with have 9700’s so I would think they would be
> bang-on.
>
> So, should I set the offset by ear, should I recalibrate, or ???  I do own
> an XG3 so if I knew how to properly calibrate it, I could go that way too.
>
> Any help is appreciated!
>
> 73
>
> K5RHD
>
> /randy
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

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[KeithWE6R]

After it is at a stable temp, just change the offset number so it is on
frequency.
Do this below and above 146.000Mhz as there are two sections in the unit.

Easiest way is to inject an exact 146.0000 signal, set the radio to
fine, IE 46.00000  go into offset menu and tap SPOT.
Then click down to 45.999999 on the radio and do the other side.
Switch back and forth with the VFO, the tone should stay very close. Set
the offsets accordingly if needed.

If there is too much drift, then order the OPTIONAL K144XV Reflock board
(installs inside the K144) and will lock it to the K3's main oscillator,
which is more stable.
They pulled the RefLock from the website but we did do another small run.
We have 7 in stock currently.
Keith WE6R
Elecraft K3 Tech.


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