K2 sn 5486 needs some help!

[John [K7SVV]-2]

Everything was normal until I got to "VCO Alignment" in part 2.  Prior to
filling out the "VCO Voltage Readings" table, I was told to change bands to
80 meters and set the VFO to 4000 kHz and to adjust L30 for 6 volts at R30.
Everything was great. Adjusting L30 felt good and lots of range but when I
measured the voltage at R30 for the other bands, things didn't look so
good.  Here is what I measured.

80m  2.4 and 6.0
40m  7.9 and 7.9
30m  7.9 and 7.9
20m  2.4 and 4.1
17m  3.1 and 3.3
15m  7.9 and 7.9
12m  4.0 and 4.4
10m  3.3 and 4.1

As you can see, the voltages are a bit high.  The instructions say that I
can adjust the range up and down by tweaking L30 but it has no affect on any
band except 80M.  The frequency at TP1 is 6828.xx and it does not change
when the VFO knob is changed.  CAL PLL results in an INFO 232 message.  Does
anyone have any idea where I should start?


--
John   [K7SVV]

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[Don Wilhelm-3]

John,

All bands look OK except 40, 30 and 15 meters.  So the PLL is working, and the VCO is working.

That would indicate that you most likely have something wrong in the VFO Range selection area - either a relay or a capacitor.  Check C73 first because it is common to all the failing bands and not used on any other band you have installed - be certain it is 47 pF (marked 470) and is well soldered the frequency you report sounds suspiciously like you soldered a 470 pF capacitor (marked 471) at C73.  Also check the soldering for relays K13, K14 and K15.

Solve this problem first before moving on to anything else like CAL PLL.  The frequency you need to read at TP1 when the K2 is tuned to 7000 kHz is somewhere close to 11915 kHz.

73,
Don W3FPR

> -----Original Message-----
>
> Everything was normal until I got to "VCO Alignment" in part 2.  Prior to
> filling out the "VCO Voltage Readings" table, I was told to
> change bands to
> 80 meters and set the VFO to 4000 kHz and to adjust L30 for 6
> volts at R30.
> Everything was great. Adjusting L30 felt good and lots of range but when I
> measured the voltage at R30 for the other bands, things didn't look so
> good.  Here is what I measured.
>
> 80m  2.4 and 6.0
> 40m  7.9 and 7.9
> 30m  7.9 and 7.9
> 20m  2.4 and 4.1
> 17m  3.1 and 3.3
> 15m  7.9 and 7.9
> 12m  4.0 and 4.4
> 10m  3.3 and 4.1
>
> As you can see, the voltages are a bit high.  The instructions say that I
> can adjust the range up and down by tweaking L30 but it has no
> affect on any
> band except 80M.  The frequency at TP1 is 6828.xx and it does not change
> when the VFO knob is changed.  CAL PLL results in an INFO 232
> message.  Does
> anyone have any idea where I should start?
>
>
> --
> John   [K7SVV]
>

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[John [K7SVV]-2]

Don,
     Well, I'll be a monkey's uncle.  You hit it right on the head.  C73 is
a marked as a 471.   Thank you!

John   [K7SVV]


On 4/30/06, Don Wilhelm <[hidden email]> wrote:

>
> John,
>
> All bands look OK except 40, 30 and 15 meters.  So the PLL is working, and
> the VCO is working.
>
> That would indicate that you most likely have something wrong in the VFO
> Range selection area - either a relay or a capacitor.  Check C73 first
> because it is common to all the failing bands and not used on any other band
> you have installed - be certain it is 47 pF (marked 470) and is well
> soldered the frequency you report sounds suspiciously like you soldered a
> 470 pF capacitor (marked 471) at C73.  Also check the soldering for relays
> K13, K14 and K15.
>
> Solve this problem first before moving on to anything else like CAL
> PLL.  The frequency you need to read at TP1 when the K2 is tuned to 7000 kHz
> is somewhere close to 11915 kHz.
>
> 73,
> Don W3FPR
>
> > -----Original Message-----
> >
> > Everything was normal until I got to "VCO Alignment" in part 2.  Prior
> to
> > filling out the "VCO Voltage Readings" table, I was told to
> > change bands to
> > 80 meters and set the VFO to 4000 kHz and to adjust L30 for 6
> > volts at R30.
> > Everything was great. Adjusting L30 felt good and lots of range but when
> I
> > measured the voltage at R30 for the other bands, things didn't look so
> > good.  Here is what I measured.
> >
> > 80m  2.4 and 6.0
> > 40m  7.9 and 7.9
> > 30m  7.9 and 7.9
> > 20m  2.4 and 4.1
> > 17m  3.1 and 3.3
> > 15m  7.9 and 7.9
> > 12m  4.0 and 4.4
> > 10m  3.3 and 4.1
> >
> > As you can see, the voltages are a bit high.  The instructions say that
> I
> > can adjust the range up and down by tweaking L30 but it has no
> > affect on any
> > band except 80M.  The frequency at TP1 is 6828.xx and it does not change
> > when the VFO knob is changed.  CAL PLL results in an INFO 232
> > message.  Does
> > anyone have any idea where I should start?
> >
> >
> > --
> > John   [K7SVV]
> >
>
>

--
John   [K7SVV]

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[Don Wilhelm-3]

Glad to hear that it was that easy.

73,
Don W3FPR

> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]]On Behalf Of John [K7SVV]
> Sent: Sunday, April 30, 2006 7:38 PM
> To: [hidden email]
> Cc: Elecraft Mail List
> Subject: Re: [Elecraft] K2 sn 5486 needs some help!
>
>
> Don,
>      Well, I'll be a monkey's uncle.  You hit it right on the
> head.  C73 is
> a marked as a 471.   Thank you!
>
> John   [K7SVV]
>
>

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