[Elecraft] KPA1500 FW 1.78 - no PTT response

[Jeff Blaine]

Loaded up the beta firmware today.  The PTT (key line) was dead after 
that.  Reloading 1.64 and all was functional again.


What am I overlooking?

73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com

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Re: [Elecraft] K2 Alignment and Test, Part II issues

[Don Wilhelm]

Don,

It seems you are having trouble with both the PLL Reference Oscillator 
and the BFO (TP2 should be near 4915kHz).
The VFO TP1 is apparently oscillating if you have a frequency of 
4918.88, but that frequency is not correct.


Tackle the PLL Reference first.
OK, the PLL Reference Oscillator is not oscillating for one reason or 
another.  Chek all the components in the circuit for proper values and 
good soldering.  You apparently can follow the schematic, if for no 
other reason than to identify components in a circuit - that is helpful 
information.
Make certain D18 is installed with the proper orientation, and that C84 
and C85 are 120pF (marked 121).


73,
Don W3FPR

On 9/27/2018 8:07 PM, Don Schroder wrote:


Don,

All three test points are not zeros. TP1 reads a solid 4918.88, TP2 
reads between flickering 267 & 289, TP3 reads all zeros.


The resistance from the source of Q19 to ground is 280 ohms.

I did make an interesting discovery when I took voltages again.  U4, 
pin 5 (SDO) is 0 volts, pin 7 (SCK) is 4.8 volts. U5, pin 1 (SCK) is 
4.8 volts, pin 2 (SDO) is 0 volts. These pins are just opposite what 
they should be (what does SDO and SCK represent?). Looks like 
something that is directional got switched?


Sounds like we are making progress, but still a possible PLL problem?

Thanks!

Don, KE0PVQ

Sent from Mail  for 
Windows 10


*From: *Don Wilhelm 
*Sent: *Thursday, September 27, 2018 4:11 PM
*To: *Don Schroder ; 
elecraft@mailman.qth.net 

*Subject: *Re: [Elecraft] K2 Alignment and Test, Part II issues

Don,

While in CAL FCTR, try the probe in TP3 and TP1 and TP2.  If you have a

zero reading in all 3 places, you most likely have a bad probe.

Yes you might have a PLL problem, but that is not certain yet. One quick

check is to measure the resistance from the source of Q19 to ground.  If

it is high or infinite, check the leads of RFC14 like you did for

RFC16.  The normal resistance is a bit more than 270 ohms.

73,

Don W3FPR

On 9/27/2018 4:41 PM, Don Schroder wrote:

>

> Don,

>

> Thank you for the excellent advice! I went to the bottom of the board

> and checked the resistance between the ends of RFC16. It was infinite,

> so I rewound RFC16 and ensured the leads were cleaned good. After

> reinstalling, I now have 4.~ votes at U6 pin 5, and 8.~ at pin 8. Pin

> 8 of the Thermistor Board has 8.~ volts, too.

>

> Now, when I select CAL FCTR and enable the frequency counter, the

> counter shows 0.00. I believe this tells me there is a problem

> with the PLL Reference Oscillator. I will continue to look at those

> components. Any other suggestions?

>

> Thanks!

>

> Don, KE0PVQ

>

> Sent from Mail  for

> Windows 10

>

> *From: *Don Wilhelm 

> *Sent: *Thursday, September 27, 2018 1:34 PM

> *To: *Don Schroder ;

> elecraft@mailman.qth.net 

> *Subject: *Re: [Elecraft] K2 Alignment and Test, Part II issues

>

> Don,

>

> You apparently have a problem with the thermistor board - or the 8 volts

>

> to it.

>

> A "voltage rail" are those PC traces that carry voltage to various parts

>

> of the circuit.

>

> In the K2, there is one for 12 volts, another for 8 volts and another

>

> for 5 volts.

>

> On the schematic they are labeled "12V", "8A" and "5V" respectively.

>

> The main 8 volt and 5 volt regulators are on the Control Board. You will

>

> find an "5B" voltage rail at the output of U8 on the RF Board and the

>

> "8B" voltage is sourced at the output side of RFC16.

>

> If you do not have 8 volts at the thermistor board pin 8, then

>

> investigate the stripping and tinning of the RFC16 leads.

>

> Once you have 8 volts at the thermistor board (RP3 position) pin 8, then

>

> recheck the voltage at U6 pin 5 - it should be quite close to 4 volts.

>

> 73,

>

> Don W3FPR

>

>



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Re: [Elecraft] K2 Alignment and Test, Part II issues

[Don Schroder]

Don,

All three test points are not zeros. TP1 reads a solid 4918.88, TP2 reads 
between flickering 267 & 289, TP3 reads all zeros.
The resistance from the source of Q19 to ground is 280 ohms.

I did make an interesting discovery when I took voltages again.  U4, pin 5 
(SDO) is 0 volts, pin 7 (SCK) is 4.8 volts. U5, pin 1 (SCK) is 4.8 volts, pin 2 
(SDO) is 0 volts. These pins are just opposite what they should be (what does 
SDO and SCK represent?). Looks like something that is directional got switched?

Sounds like we are making progress, but still a possible PLL problem?

Thanks!
Don, KE0PVQ

Sent from Mail for Windows 10

From: Don Wilhelm
Sent: Thursday, September 27, 2018 4:11 PM
To: Don Schroder; 
elecraft@mailman.qth.net
Subject: Re: [Elecraft] K2 Alignment and Test, Part II issues

Don,

While in CAL FCTR, try the probe in TP3 and TP1 and TP2.  If you have a
zero reading in all 3 places, you most likely have a bad probe.
Yes you might have a PLL problem, but that is not certain yet. One quick
check is to measure the resistance from the source of Q19 to ground.  If
it is high or infinite, check the leads of RFC14 like you did for
RFC16.  The normal resistance is a bit more than 270 ohms.

73,
Don W3FPR

On 9/27/2018 4:41 PM, Don Schroder wrote:
>
> Don,
>
> Thank you for the excellent advice! I went to the bottom of the board
> and checked the resistance between the ends of RFC16. It was infinite,
> so I rewound RFC16 and ensured the leads were cleaned good. After
> reinstalling, I now have 4.~ votes at U6 pin 5, and 8.~ at pin 8. Pin
> 8 of the Thermistor Board has 8.~ volts, too.
>
> Now, when I select CAL FCTR and enable the frequency counter, the
> counter shows 0.00. I believe this tells me there is a problem
> with the PLL Reference Oscillator. I will continue to look at those
> components. Any other suggestions?
>
> Thanks!
>
> Don, KE0PVQ
>
> Sent from Mail  for
> Windows 10
>
> *From: *Don Wilhelm 
> *Sent: *Thursday, September 27, 2018 1:34 PM
> *To: *Don Schroder ;
> elecraft@mailman.qth.net 
> *Subject: *Re: [Elecraft] K2 Alignment and Test, Part II issues
>
> Don,
>
> You apparently have a problem with the thermistor board - or the 8 volts
>
> to it.
>
> A "voltage rail" are those PC traces that carry voltage to various parts
>
> of the circuit.
>
> In the K2, there is one for 12 volts, another for 8 volts and another
>
> for 5 volts.
>
> On the schematic they are labeled "12V", "8A" and "5V" respectively.
>
> The main 8 volt and 5 volt regulators are on the Control Board. You will
>
> find an "5B" voltage rail at the output of U8 on the RF Board and the
>
> "8B" voltage is sourced at the output side of RFC16.
>
> If you do not have 8 volts at the thermistor board pin 8, then
>
> investigate the stripping and tinning of the RFC16 leads.
>
> Once you have 8 volts at the thermistor board (RP3 position) pin 8, then
>
> recheck the voltage at U6 pin 5 - it should be quite close to 4 volts.
>
> 73,
>
> Don W3FPR
>
>


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[Elecraft] P3 for Doug

[James Wilson]

I sent Doug an email about my P3 that is available
P3, P3SVGA and TXMON (2000W) for $800
Jim - W4RKS
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Re: [Elecraft] K2 Alignment and Test, Part II issues

[Don Wilhelm]

Don,

While in CAL FCTR, try the probe in TP3 and TP1 and TP2.  If you have a 
zero reading in all 3 places, you most likely have a bad probe.
Yes you might have a PLL problem, but that is not certain yet. One quick 
check is to measure the resistance from the source of Q19 to ground.  If 
it is high or infinite, check the leads of RFC14 like you did for 
RFC16.  The normal resistance is a bit more than 270 ohms.


73,
Don W3FPR

On 9/27/2018 4:41 PM, Don Schroder wrote:


Don,

Thank you for the excellent advice! I went to the bottom of the board 
and checked the resistance between the ends of RFC16. It was infinite, 
so I rewound RFC16 and ensured the leads were cleaned good. After 
reinstalling, I now have 4.~ votes at U6 pin 5, and 8.~ at pin 8. Pin 
8 of the Thermistor Board has 8.~ volts, too.


Now, when I select CAL FCTR and enable the frequency counter, the 
counter shows 0.00. I believe this tells me there is a problem 
with the PLL Reference Oscillator. I will continue to look at those 
components. Any other suggestions?


Thanks!

Don, KE0PVQ

Sent from Mail  for 
Windows 10


*From: *Don Wilhelm 
*Sent: *Thursday, September 27, 2018 1:34 PM
*To: *Don Schroder ; 
elecraft@mailman.qth.net 

*Subject: *Re: [Elecraft] K2 Alignment and Test, Part II issues

Don,

You apparently have a problem with the thermistor board - or the 8 volts

to it.

A "voltage rail" are those PC traces that carry voltage to various parts

of the circuit.

In the K2, there is one for 12 volts, another for 8 volts and another

for 5 volts.

On the schematic they are labeled "12V", "8A" and "5V" respectively.

The main 8 volt and 5 volt regulators are on the Control Board. You will

find an "5B" voltage rail at the output of U8 on the RF Board and the

"8B" voltage is sourced at the output side of RFC16.

If you do not have 8 volts at the thermistor board pin 8, then

investigate the stripping and tinning of the RFC16 leads.

Once you have 8 volts at the thermistor board (RP3 position) pin 8, then

recheck the voltage at U6 pin 5 - it should be quite close to 4 volts.

73,

Don W3FPR




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Re: [Elecraft] Elecraft Digest, Vol 173, Issue 24

[Alan B via Elecraft]

73 Alan

> On 27 Sep 2018, at 18:43, elecraft-requ...@mailman.qth.net wrote:
> 
> Send Elecraft mailing list submissions to
>elecraft@mailman.qth.net
> 
> To subscribe or unsubscribe via the World Wide Web, visit
>http://mailman.qth.net/mailman/listinfo/elecraft
> or, via email, send a message with subject or body 'help' to
>elecraft-requ...@mailman.qth.net
> 
> You can reach the person managing the list at
>elecraft-ow...@mailman.qth.net
> 
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Elecraft digest..."
> 
> 
> Today's Topics:
> 
>   1. Re: Shipping high value items by UPS (JOE)
>   2. K3 internal 2-meter transverter problem (Rus Healy)
>   3. Re: P3 Turn On (Martin Sole)
>   4. Re: P3 Turn On (Bob McGraw K4TAX)
>   5. Re: Shipping high value items by UPS (Bill Johnson)
>   6. Re: Shipping high value items by UPS (K9MA)
>   7. Re: Shipping high value items by UPS (Barry)
>   8. Re: Shipping high value items by UPS (Dan Mouer)
>   9. Re: Shipping high value items by UPS (Bob)
>  10. Re: Shipping high value items by UPS (Gwen Patton)
>  11. K3 problem after latest sw update (pa...@pa0kv.nl)
>  12. Re: My KX2 may be sick (Dave New, N8SBE)
>  13. Re: Shipping high value items by UPS
>  (Eric Swartz - WA6HHQ, Elecraft)
>  14. K2 Alignment and Test, Part II issues (Don Schroder)
>  15. Re: K2 Alignment and Test, Part II issues (Don Wilhelm)
>  16. Re: My KX2 may be sick (Paul Smith)
>  17. Re: K3 problem after latest sw update (Nr4c)
>  18. Re: K3 problem after latest sw update (pa...@pa0kv.nl)
>  19. K-Pod CTS to match VFO (Art)
>  20. Re: K2 Alignment and Test, Part II issues (Don Wilhelm)
>  21. Re: K-Pod CTS to match VFO (Don Wilhelm)
>  22. Re: K2 Alignment and Test, Part II issues (Don Schroder)
> 
> 
> --
> 
> Message: 1
> Date: Tue, 25 Sep 2018 20:48:14 -0400
> From: JOE 
> To: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] Shipping high value items by UPS
> Message-ID: <7c99217d-44f6-75dd-22e0-45430110f...@snet.net>
> Content-Type: text/plain; charset=utf-8; format=flowed
> 
>> On 9/25/2018 8:15 PM, elecraft-requ...@mailman.qth.net wrote:
>> Message: 6
>> Date: Tue, 25 Sep 2018 14:36:59 -0400
>> From: Grant Youngman
>> To: Elecraft Reflector Reflector
>> Subject: [Elecraft] Shipping high value items by UPS
>> 
>> The thread started by the gentleman who thought his KX2 might be dead and 
>> needed to go to Elecraft motivated me to make this comment about shipping.
> 
> I shipped my K3 back to Elecraft earlier this year via UPS and $2,500 
> insurance.? I use a local hardware store in my town that has UPS service 
> at the normal rates.? They said they use a company that contracts with 
> UPS for shipping.? The company that provides the UPS service to the 
> hardware store requires inspection of high value packages, reportedly 
> due to some fraud cases in the past.? Because they know me well they 
> took my word that I double boxed it and packed it well, I didn't have to 
> unpack it.? I had shipped many things with them in the past with no 
> problems.
> 
> For the return address, I use my local post office where I have a PO 
> box.? It's a little known fact that the USPS will accept packages for PO 
> box holders from any private carrier, UPS, FedEx, etc.? They will also 
> sign for some packages requiring signature if you have a signature on 
> file.? This solves my problem of packages left on my doorstep for people 
> to potentially steal.? This also solves the problem of people/businesses 
> that will not ship to a PO box.
> 
> This is how I address packages to be mailed to me.
> 
> My Name
> 34 Main Street? #(my PO box number)
> East Haddam, CT 06423
> 
> A really nice feature of the post office.? Look at:
> 
> 
> 
> 73, Joe, K1ike
> 
> 
> 
> 
> --
> 
> Message: 2
> Date: Tue, 25 Sep 2018 21:13:27 -0400
> From: Rus Healy 
> To: elecraft@mailman.qth.net
> Subject: [Elecraft] K3 internal 2-meter transverter problem
> Message-ID:
>
> Content-Type: text/plain; charset="UTF-8"
> 
> I have an older K3 (low-2000 serial number) with the K144XV internal
> 2-meter transverter and KXV3A module (factory-upgraded in 2014).
> 
> In the September VHF contest, the first time I've used that band on that
> radio, I found that the transmitter is flying. It puts out 2-3 watts when
> keyed, regardless of mode (CW, SSB), with no keying/modulation. It drives
> up to a few watts output and sounds okay on-frequency, TX and RX, but is
> clearly not stable and the bad energy is in-band on 2 meters, and quite
> nearby.
> 
> I haven't looked at the output on the spectrum analyzer yet, or taken the
> radio apart to inspect the transverter; I wanted to ask here for any
> similar experiences before I tear into it to hopefully save a bit of time.
> 
> Thanks in advance.
> 
> --73, Rus, K2UA
> 
> 
> 

Re: [Elecraft] K2 Alignment and Test, Part II issues

[Don Schroder]

Don,

Thank you for the excellent advice! I went to the bottom of the board and 
checked the resistance between the ends of RFC16. It was infinite, so I rewound 
RFC16 and ensured the leads were cleaned good. After reinstalling, I now have 
4.~ votes at U6 pin 5, and 8.~ at pin 8. Pin 8 of the Thermistor Board has 8.~ 
volts, too.

Now, when I select CAL FCTR and enable the frequency counter, the counter shows 
0.00. I believe this tells me there is a problem with the PLL Reference 
Oscillator. I will continue to look at those components. Any other suggestions?

Thanks!
Don, KE0PVQ

Sent from Mail for Windows 10

From: Don Wilhelm
Sent: Thursday, September 27, 2018 1:34 PM
To: Don Schroder; 
elecraft@mailman.qth.net
Subject: Re: [Elecraft] K2 Alignment and Test, Part II issues

Don,

You apparently have a problem with the thermistor board - or the 8 volts
to it.
A "voltage rail" are those PC traces that carry voltage to various parts
of the circuit.
In the K2, there is one for 12 volts, another for 8 volts and another
for 5 volts.
On the schematic they are labeled "12V", "8A" and "5V" respectively.
The main 8 volt and 5 volt regulators are on the Control Board. You will
find an "5B" voltage rail at the output of U8 on the RF Board and the
"8B" voltage is sourced at the output side of RFC16.
If you do not have 8 volts at the thermistor board pin 8, then
investigate the stripping and tinning of the RFC16 leads.
Once you have 8 volts at the thermistor board (RP3 position) pin 8, then
recheck the voltage at U6 pin 5 - it should be quite close to 4 volts.

73,
Don W3FPR

On 9/27/2018 1:43 PM, Don Schroder wrote:
>
> Don,
>
> Board U6 pin 5
>
> Thank you for the suggestions! The DC voltage at RF Board U6 pin 5 is
> 0 volts. In fact, all pins of U6, except pin 6, are 0 volts. Pin 6 is
> less than 1 volt.
>
> I saw a bridge between C96 and RFC10, the schematic shows these two
> components connecting together, so that should be ok. I’m still
> looking for bridges.
>
> Could you elaborate a little on the ^voltage rail*? How do I identify
> the rail on a schematic, or can I? Which component is the 8 volt
> regulator? I feel I should know the answers to these questions, I must
> be having a senior moment. Your help and advice is much appreciarted!
>
> Thanks!
>
> Don, KE0PVQ
>
> Sent from Mail  for
> Windows 10
>
> *From: *Don Wilhelm 
> *Sent: *Thursday, September 27, 2018 11:01 AM
> *To: *Don Schroder ;
> elecraft@mailman.qth.net 
> *Subject: *Re: [Elecraft] K2 Alignment and Test, Part II issues
>
> Don,
>
> First check the DC voltage at RF Board U6 pin 5 - it should be 4 volts
>
> (or 1/2 the 8 volt regulator output voltage).  If it is not correct, you
>
> have a problem with the thermistor board - most likely a solder bridge.
>
> You should have 8 volts at the thermistor board pin 8.  If that is not
>
> correct, look carefully for solder bridges.  That 8 volts comes directly
>
> from the 8 volt regulator voltage rail.
>
> It does sound like you have a problem with the PLL Reference Oscillator,
>
> but your voltage measurements on the thermistor board pins should be
>
> investigated first before drawing any other conclusions.
>
> Make sure you have good results with the PLL range tests just after that.
>
> The exact frequency of the 4 MHz Oscillator is not critical at this
>
> point - for now it only substantiates that the oscillator is working. If
>
> you put a probe on C22, it will pull the frequency.  If your frequency
>
> counter is sufficiently accurate, wait until you have a good frequency
>
> at TP1, and then measure the frequency with both the counter and the
>
> internal counter probe using CAL FCTR. Adjust C22 so CAL FCTR frequency
>
> is the same as your external counter.
>
> I do not know the accuracy of your counter, but mine is accurate to 10
>
> exp-9 and I can set C22 with it for good K2 Dial Calibration.  There are
>
> other methods for setting C22 that do not depend on the accuracy of your
>
> frequency counter.  When you can receive WWV at 10 or better 15 MHz,
>
> look at my website www.w3fpr.com article on K2 Dial Calibration to
>
> accurately set C22 and achieve good K2 dial calibration.
>
> 73,
>
> Don W3FPR
>
> On 9/26/2018 8:14 PM, Don Schroder wrote:
>
> > Hi folks,
>
> >
>
> > Got to the subject location on my K2 kit #7818, and am having some
> difficulties with the tests. My frequency counter, when touched to the
> left side of trimmer capacitor C22, reads 3999.98 on the LCD. This
> makes me believe there is no problem with the frequency counter probe
> that I assembled.
>
> >
>
> > On page 63, under *4 MHz Oscillator Calibration,  I selected CAL
> FCTR, and the LCD displays a rapidly changing 

[Elecraft] Looking for a P3

[Doug Millar via Elecraft]

Hi, I would like to buy a used P3 panadaptor. Does anyone know of one for sale? 
 VGA board would be a plus. Please reply privately to drzarko...@yahoo.com. 
 Thanks, Doug K6JEY
__
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Re: [Elecraft] K2 Alignment and Test, Part II issues

[Don Wilhelm]

Don,

You apparently have a problem with the thermistor board - or the 8 volts 
to it.
A "voltage rail" are those PC traces that carry voltage to various parts 
of the circuit.
In the K2, there is one for 12 volts, another for 8 volts and another 
for 5 volts.

On the schematic they are labeled "12V", "8A" and "5V" respectively.
The main 8 volt and 5 volt regulators are on the Control Board. You will 
find an "5B" voltage rail at the output of U8 on the RF Board and the 
"8B" voltage is sourced at the output side of RFC16.
If you do not have 8 volts at the thermistor board pin 8, then 
investigate the stripping and tinning of the RFC16 leads.
Once you have 8 volts at the thermistor board (RP3 position) pin 8, then 
recheck the voltage at U6 pin 5 - it should be quite close to 4 volts.


73,
Don W3FPR

On 9/27/2018 1:43 PM, Don Schroder wrote:


Don,

Board U6 pin 5

Thank you for the suggestions! The DC voltage at RF Board U6 pin 5 is 
0 volts. In fact, all pins of U6, except pin 6, are 0 volts. Pin 6 is 
less than 1 volt.


I saw a bridge between C96 and RFC10, the schematic shows these two 
components connecting together, so that should be ok. I’m still 
looking for bridges.


Could you elaborate a little on the ^voltage rail*? How do I identify 
the rail on a schematic, or can I? Which component is the 8 volt 
regulator? I feel I should know the answers to these questions, I must 
be having a senior moment. Your help and advice is much appreciarted!


Thanks!

Don, KE0PVQ

Sent from Mail  for 
Windows 10


*From: *Don Wilhelm 
*Sent: *Thursday, September 27, 2018 11:01 AM
*To: *Don Schroder ; 
elecraft@mailman.qth.net 

*Subject: *Re: [Elecraft] K2 Alignment and Test, Part II issues

Don,

First check the DC voltage at RF Board U6 pin 5 - it should be 4 volts

(or 1/2 the 8 volt regulator output voltage).  If it is not correct, you

have a problem with the thermistor board - most likely a solder bridge.

You should have 8 volts at the thermistor board pin 8.  If that is not

correct, look carefully for solder bridges.  That 8 volts comes directly

from the 8 volt regulator voltage rail.

It does sound like you have a problem with the PLL Reference Oscillator,

but your voltage measurements on the thermistor board pins should be

investigated first before drawing any other conclusions.

Make sure you have good results with the PLL range tests just after that.

The exact frequency of the 4 MHz Oscillator is not critical at this

point - for now it only substantiates that the oscillator is working. If

you put a probe on C22, it will pull the frequency.  If your frequency

counter is sufficiently accurate, wait until you have a good frequency

at TP1, and then measure the frequency with both the counter and the

internal counter probe using CAL FCTR. Adjust C22 so CAL FCTR frequency

is the same as your external counter.

I do not know the accuracy of your counter, but mine is accurate to 10

exp-9 and I can set C22 with it for good K2 Dial Calibration.  There are

other methods for setting C22 that do not depend on the accuracy of your

frequency counter.  When you can receive WWV at 10 or better 15 MHz,

look at my website www.w3fpr.com article on K2 Dial Calibration to

accurately set C22 and achieve good K2 dial calibration.

73,

Don W3FPR

On 9/26/2018 8:14 PM, Don Schroder wrote:

> Hi folks,

>

> Got to the subject location on my K2 kit #7818, and am having some 
difficulties with the tests. My frequency counter, when touched to the 
left side of trimmer capacitor C22, reads 3999.98 on the LCD. This 
makes me believe there is no problem with the frequency counter probe 
that I assembled.


>

> On page 63, under *4 MHz Oscillator Calibration,  I selected CAL 
FCTR, and the LCD displays a rapidly changing frequency between 185.~ 
to 188.~. It does not show a frequency of 12090 kHz  suggested by the 
manual.  This tells me I have a problem with the PLL Reference 
Oscillator (since the frequency counter probe appeared to be ok). I 
then decided to check voltages, and discovered that I am missing some 
+5v signals from U4 and U5.


>

> Any suggestions on where to look next? I’d like to trace the 5v 
signals, but I don’t see how to do that using the schematics. I did 
measure voltages on the 8 pins of the Thermistor Board, they were all 
0 volts! That didn’t seem right, either.


>

> Appreciate any suggestions! Thanks!

> Don, KE0PVQ

>

> Sent from Mail for 
Windows 10


>

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Re: [Elecraft] K2 Alignment and Test, Part II issues

[Don Schroder]

Don,
Board U6 pin 5
Thank you for the suggestions! The DC voltage at RF Board U6 pin 5 is 0 volts. 
In fact, all pins of U6, except pin 6, are 0 volts. Pin 6 is less than 1 volt.

I saw a bridge between C96 and RFC10, the schematic shows these two components 
connecting together, so that should be ok. I’m still looking for bridges.

Could you elaborate a little on the ^voltage rail*? How do I identify the rail 
on a schematic, or can I? Which component is the 8 volt regulator? I feel I 
should know the answers to these questions, I must be having a senior moment. 
Your help and advice is much appreciarted!

Thanks!
Don, KE0PVQ

Sent from Mail for Windows 10

From: Don Wilhelm
Sent: Thursday, September 27, 2018 11:01 AM
To: Don Schroder; 
elecraft@mailman.qth.net
Subject: Re: [Elecraft] K2 Alignment and Test, Part II issues

Don,

First check the DC voltage at RF Board U6 pin 5 - it should be 4 volts
(or 1/2 the 8 volt regulator output voltage).  If it is not correct, you
have a problem with the thermistor board - most likely a solder bridge.

You should have 8 volts at the thermistor board pin 8.  If that is not
correct, look carefully for solder bridges.  That 8 volts comes directly
from the 8 volt regulator voltage rail.

It does sound like you have a problem with the PLL Reference Oscillator,
but your voltage measurements on the thermistor board pins should be
investigated first before drawing any other conclusions.

Make sure you have good results with the PLL range tests just after that.

The exact frequency of the 4 MHz Oscillator is not critical at this
point - for now it only substantiates that the oscillator is working. If
you put a probe on C22, it will pull the frequency.  If your frequency
counter is sufficiently accurate, wait until you have a good frequency
at TP1, and then measure the frequency with both the counter and the
internal counter probe using CAL FCTR.  Adjust C22 so CAL FCTR frequency
is the same as your external counter.

I do not know the accuracy of your counter, but mine is accurate to 10
exp-9 and I can set C22 with it for good K2 Dial Calibration.  There are
other methods for setting C22 that do not depend on the accuracy of your
frequency counter.  When you can receive WWV at 10 or better 15 MHz,
look at my website www.w3fpr.com article on K2 Dial Calibration to
accurately set C22 and achieve good K2 dial calibration.

73,
Don W3FPR

On 9/26/2018 8:14 PM, Don Schroder wrote:
> Hi folks,
>
> Got to the subject location on my K2 kit #7818, and am having some 
> difficulties with the tests. My frequency counter, when touched to the left 
> side of trimmer capacitor C22, reads 3999.98 on the LCD. This makes me 
> believe there is no problem with the frequency counter probe that I assembled.
>
> On page 63, under *4 MHz Oscillator Calibration,  I selected CAL FCTR, and 
> the LCD displays a rapidly changing frequency between 185.~ to 188.~. It does 
> not show a frequency of 12090 kHz  suggested by the manual.  This tells me I 
> have a problem with the PLL Reference Oscillator (since the frequency counter 
> probe appeared to be ok). I then decided to check voltages, and discovered 
> that I am missing some +5v signals from U4 and U5.
>
> Any suggestions on where to look next? I’d like to trace the 5v signals, but 
> I don’t see how to do that using the schematics. I did measure voltages on 
> the 8 pins of the Thermistor Board, they were all 0 volts! That didn’t seem 
> right, either.
>
> Appreciate any suggestions! Thanks!
> Don, KE0PVQ
>
> Sent from Mail for Windows 10
>
> __
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft@mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to donw...@embarqmail.com
>

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Re: [Elecraft] K-Pod CTS to match VFO

[Don Wilhelm]

As I recall, most of the K-pod field testers thought the reduced CTS was 
beneficial given the placement of the knob.


Of course, they were most all CW contesters who wanted a slower tuning rate.

73,
Don W3FPR

On 9/27/2018 10:07 AM, Art via Elecraft wrote:



When the K-Pod first came out, it was mentioned that the CTS of the K-Pod was 
1/2 of the VFO. That is still the case. Case in point: Set VFO CTS to 200. 
K-Pod CTS is only 100.

Could the developers PLEASE write the code to allow the K-Pod to operate at the 
same CTS as the VFO?

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Re: [Elecraft] K2 Alignment and Test, Part II issues

[Don Wilhelm]

Don,

First check the DC voltage at RF Board U6 pin 5 - it should be 4 volts 
(or 1/2 the 8 volt regulator output voltage).  If it is not correct, you 
have a problem with the thermistor board - most likely a solder bridge.


You should have 8 volts at the thermistor board pin 8.  If that is not 
correct, look carefully for solder bridges.  That 8 volts comes directly 
from the 8 volt regulator voltage rail.


It does sound like you have a problem with the PLL Reference Oscillator, 
but your voltage measurements on the thermistor board pins should be 
investigated first before drawing any other conclusions.


Make sure you have good results with the PLL range tests just after that.

The exact frequency of the 4 MHz Oscillator is not critical at this 
point - for now it only substantiates that the oscillator is working. If 
you put a probe on C22, it will pull the frequency.  If your frequency 
counter is sufficiently accurate, wait until you have a good frequency 
at TP1, and then measure the frequency with both the counter and the 
internal counter probe using CAL FCTR.  Adjust C22 so CAL FCTR frequency 
is the same as your external counter.


I do not know the accuracy of your counter, but mine is accurate to 10 
exp-9 and I can set C22 with it for good K2 Dial Calibration.  There are 
other methods for setting C22 that do not depend on the accuracy of your 
frequency counter.  When you can receive WWV at 10 or better 15 MHz, 
look at my website www.w3fpr.com article on K2 Dial Calibration to 
accurately set C22 and achieve good K2 dial calibration.


73,
Don W3FPR

On 9/26/2018 8:14 PM, Don Schroder wrote:

Hi folks,

Got to the subject location on my K2 kit #7818, and am having some difficulties 
with the tests. My frequency counter, when touched to the left side of trimmer 
capacitor C22, reads 3999.98 on the LCD. This makes me believe there is no 
problem with the frequency counter probe that I assembled.

On page 63, under *4 MHz Oscillator Calibration,  I selected CAL FCTR, and the 
LCD displays a rapidly changing frequency between 185.~ to 188.~. It does not 
show a frequency of 12090 kHz  suggested by the manual.  This tells me I have a 
problem with the PLL Reference Oscillator (since the frequency counter probe 
appeared to be ok). I then decided to check voltages, and discovered that I am 
missing some +5v signals from U4 and U5.

Any suggestions on where to look next? I’d like to trace the 5v signals, but I 
don’t see how to do that using the schematics. I did measure voltages on the 8 
pins of the Thermistor Board, they were all 0 volts! That didn’t seem right, 
either.

Appreciate any suggestions! Thanks!
Don, KE0PVQ

Sent from Mail for Windows 10

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[Elecraft] K-Pod CTS to match VFO

[Art via Elecraft]

Hi all,


When the K-Pod first came out, it was mentioned that the CTS of the K-Pod was 
1/2 of the VFO. That is still the case. Case in point: Set VFO CTS to 200. 
K-Pod CTS is only 100.


Could the developers PLEASE write the code to allow the K-Pod to operate at the 
same CTS as the VFO?


It would certainly be appreciated here. 


73,


Art KZ5D
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Re: [Elecraft] K3 problem after latest sw update

[pa0kv]

I tuned into my inv-V with 8 Watt on 3.63 Mhz and
connected a 1 meter wire as antenna on my HP frequency counter.
The counter displayed 3.2177 Mhz ! An offset of approximately .412 Mhz

Still no idea. Waiting on k3support@elecraft...

Twan - pa0kv

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