Elecraft › [K2]

[K2] Sidetone has suddenly disappeared.

Classic

List

Threaded

9 messages Options

Chip Stratton

[K2] Sidetone has suddenly disappeared.

My K2 suddenly quit supplying a sidetone. Changing sidetone level and
frequency do nothing.

Per the troubleshooting guide, I've found that the drain of Q5 has no AC
voltage when key down, while pin one of U10 (IIRC) is supplying 5 volts (and
pin 25 of the IC in the previous step had expected 2.5v AC).

So, this seems to mean that Q5 is bad, but when I pulled it and tested it
with the M3 semiconductor analyzer, it is not obviously bad (to me anyway).
It reads NMOS Vth=1.76v, S-G-D mA=1.13 - whatever that means, I don't know
enough to interpret.

Any off the cuff ideas? I have a replacement 2n7000 on the way, but still
wondering why it would fail in circuit, and if its really bad.

Thanks,
Chip
AE5KA
______________________________________________________________
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

Don Wilhelm-4

Re: [K2] Sidetone has suddenly disappeared.

Chip,

I suspect that you accidentally toggled the sidetone source in the menu.
If your K2 SN is 3000 or greater, or you have an earlier K2 with the
KPA100 or KIO2 added, you need to select U8-4 for the sidetone source.
If none of those conditions match, the sidetone source is U6-25.

If you put Q5 back in the circuit, enter the menu for St L, hold EDIT to
edit the parameter, and first set the level at something reasonable -
between 20 and 40 - then tap the DISPLAY button to toggle the source.
When you hear sidetone, stop and exit the menu.

To prevent future occurrences, I suggest that you do not set a PF key to
St L. When zero-beating, adjust the audio level on the signal (to match
the sidetone level) with the AF Gain control instead of adjusting the
level of the sidetone to match whatever signal level you have.

73,
Don W3FPR

On 7/28/2011 7:37 AM, Chip Stratton wrote:

> My K2 suddenly quit supplying a sidetone. Changing sidetone level and
> frequency do nothing.
>
> Per the troubleshooting guide, I've found that the drain of Q5 has no AC
> voltage when key down, while pin one of U10 (IIRC) is supplying 5 volts (and
> pin 25 of the IC in the previous step had expected 2.5v AC).
>
> So, this seems to mean that Q5 is bad, but when I pulled it and tested it
> with the M3 semiconductor analyzer, it is not obviously bad (to me anyway).
> It reads NMOS Vth=1.76v, S-G-D mA=1.13 - whatever that means, I don't know
> enough to interpret.
>
> Any off the cuff ideas? I have a replacement 2n7000 on the way, but still
> wondering why it would fail in circuit, and if its really bad.
>
> Thanks,
> Chip
> AE5KA
>

______________________________________________________________
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

Chip Stratton

Re: [K2] Sidetone has suddenly disappeared.

Nuts. Ill bet i inadvertantly changed the sidetone source, because i had
been viewing the secondary menus just before. Overlooked sidetone source.
Should have posted before pulling..... I got this K2 second hand and have
been trying to learn the ins and outs - there is a lot there.

Thanks for your time Don!

Chip

On Thursday, July 28, 2011, Don Wilhelm <[hidden email]> wrote:

> Chip,
>
> I suspect that you accidentally toggled the sidetone source in the menu.
> If your K2 SN is 3000 or greater, or you have an earlier K2 with the
> KPA100 or KIO2 added, you need to select U8-4 for the sidetone source.
> If none of those conditions match, the sidetone source is U6-25.
>
> If you put Q5 back in the circuit, enter the menu for St L, hold EDIT to
> edit the parameter, and first set the level at something reasonable -
> between 20 and 40 - then tap the DISPLAY button to toggle the source.
> When you hear sidetone, stop and exit the menu.
>
> To prevent future occurrences, I suggest that you do not set a PF key to
> St L. When zero-beating, adjust the audio level on the signal (to match
> the sidetone level) with the AF Gain control instead of adjusting the
> level of the sidetone to match whatever signal level you have.
>
> 73,
> Don W3FPR
>

Don Wilhelm-4

Re: [K2] Sidetone has suddenly disappeared.

Chip,

If you want to do a good job of learning the K2, go through the manual -
you can skip the assembly parts because it is already assembled, but
"walk through" the alignment and test parts. There is a lot of learning
that a builder obtains in those sections that is not repeated anywhere
else. You will not have to actually do the alignments, but just know
that those steps are present. Then repeat that process for each of the
installed options.
If you do not have the manuals, you may download them from the Elecraft
website.

It would be nice if some enterprising K2 owner would write a
comprehensive K2 Owner's Manual since many K2s now are not owned by
those who have built one. Is there anyone out there up to the task? I
simply do not have the time to do that.

73,
Don W3FPR

On 7/28/2011 10:00 AM, Chip Stratton wrote:

> Nuts. Ill bet i inadvertantly changed the sidetone source, because i had
> been viewing the secondary menus just before. Overlooked sidetone source.
> Should have posted before pulling..... I got this K2 second hand and have
> been trying to learn the ins and outs - there is a lot there.
>
> Thanks for your time Don!
>
> Chip
>
> On Thursday, July 28, 2011, Don Wilhelm<[hidden email]> wrote:
>> Chip,
>>
>> I suspect that you accidentally toggled the sidetone source in the menu.
>> If your K2 SN is 3000 or greater, or you have an earlier K2 with the
>> KPA100 or KIO2 added, you need to select U8-4 for the sidetone source.
>> If none of those conditions match, the sidetone source is U6-25.
>>
>> If you put Q5 back in the circuit, enter the menu for St L, hold EDIT to
>> edit the parameter, and first set the level at something reasonable -
>> between 20 and 40 - then tap the DISPLAY button to toggle the source.
>> When you hear sidetone, stop and exit the menu.
>>
>> To prevent future occurrences, I suggest that you do not set a PF key to
>> St L. When zero-beating, adjust the audio level on the signal (to match
>> the sidetone level) with the AF Gain control instead of adjusting the
>> level of the sidetone to match whatever signal level you have.
>>
>> 73,
>> Don W3FPR
>>
> ______________________________________________________________
> 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
>

Pedro Correia

K2 Keying Weight (DOT) menu

Good Morning,

Just finish my K2 serial 7179 a week ago, I run thru the menus and I was learnig how to use it in the best way, and now I do not undurstand the Keying Weight (DOT) menu. Shouldn't it be in a 1:1 default setting? I am used to a 1:1 ratio, for that the menu is 1.00 setting? Right? Does anybody knows why the default setting is 1.10?
Thank you in advance.

73

Pedro CT2GET

______________________________________________________________
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

Guy, K2AV

Re: K2 Keying Weight (DOT) menu

Many of the K2 settings are somewhat relative, depending ultimately on
your actual component values, which are not exact, but within a
manufacturing tolerance. Listen to your transmitted dots on a
separate RX and see if they SOUND equal. Adjust the number if you
think dots are too long or too short. If it SOUNDS equal, leave it
alone.

73, Guy.

On Thu, Jul 28, 2011 at 11:06 AM, Pedro Correia
<[hidden email]> wrote:

>
> Good Morning,
>
> Just finish my K2 serial 7179 a week ago, I run thru the menus and I was learnig how to use it in the best way, and now I do not undurstand the Keying Weight (DOT) menu. Shouldn't it be in a 1:1 default setting? I am used to a 1:1 ratio, for that the menu is 1.00 setting? Right? Does anybody knows why the default setting is 1.10?
> Thank you in advance.
>
> 73
>
> Pedro CT2GET
>
> ______________________________________________________________
> 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
>

Pedro Correia

Re: K2 Keying Weight (DOT) menu

Thank you for your rapid reply. I am not very good at morse code, just learn it. The audio morse tone locks good as the morse does. I will try to see it im my osciloscope, dot one square, dash three squares... at least this way I am able to see exactly what the menu is changing, afther all I don´t think it will need adjustment.

73

Pedro CT2GET

> Date: Thu, 28 Jul 2011 11:31:49 -0400
> Subject: Re: [Elecraft] K2 Keying Weight (DOT) menu
> From: [hidden email]
> To: [hidden email]
> CC: [hidden email]
>
> Many of the K2 settings are somewhat relative, depending ultimately on
> your actual component values, which are not exact, but within a
> manufacturing tolerance. Listen to your transmitted dots on a
> separate RX and see if they SOUND equal. Adjust the number if you
> think dots are too long or too short. If it SOUNDS equal, leave it
> alone.
>
> 73, Guy.
>
> On Thu, Jul 28, 2011 at 11:06 AM, Pedro Correia
> <[hidden email]> wrote:
> >
> > Good Morning,
> >
> > Just finish my K2 serial 7179 a week ago, I run thru the menus and I was learnig how to use it in the best way, and now I do not undurstand the Keying Weight (DOT) menu. Shouldn't it be in a 1:1 default setting? I am used to a 1:1 ratio, for that the menu is 1.00 setting? Right? Does anybody knows why the default setting is 1.10?
> > Thank you in advance.
> >
> > 73
> >
> > Pedro CT2GET
> >
> > ______________________________________________________________
> > 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
> >

Guy, K2AV

Re: K2 Keying Weight (DOT) menu

Trust your ears. If it sounds good, it is good. Other people are
copying with their ears too. They are not using an oscilloscope to
copy.

73 & GL,

Guy

On Thu, Jul 28, 2011 at 11:51 AM, Pedro Correia
<[hidden email]> wrote:

> Thank you for your rapid reply. I am not very good at morse code, just learn
> it. The audio morse tone locks good as the morse does. I will try to see it
> im my osciloscope, dot one square, dash three squares... at least this way I
> am able to see exactly what the menu is changing, afther all I don´t think
> it will need adjustment.
>
> 73
>
> Pedro CT2GET
>
>
>> Date: Thu, 28 Jul 2011 11:31:49 -0400
>> Subject: Re: [Elecraft] K2 Keying Weight (DOT) menu
>> From: [hidden email]
>> To: [hidden email]
>> CC: [hidden email]
>>
>> Many of the K2 settings are somewhat relative, depending ultimately on
>> your actual component values, which are not exact, but within a
>> manufacturing tolerance. Listen to your transmitted dots on a
>> separate RX and see if they SOUND equal. Adjust the number if you
>> think dots are too long or too short. If it SOUNDS equal, leave it
>> alone.
>>
>> 73, Guy.
>>
>> On Thu, Jul 28, 2011 at 11:06 AM, Pedro Correia
>> <[hidden email]> wrote:
>> >
>> > Good Morning,
>> >
>> > Just finish my K2 serial 7179 a week ago, I run thru the menus and I was
>> > learnig how to use it in the best way, and now I do not undurstand the
>> > Keying Weight (DOT) menu. Shouldn't it be in a 1:1 default setting? I am
>> > used to a 1:1 ratio, for that the menu is 1.00 setting? Right? Does anybody
>> > knows why the default setting is 1.10?
>> > Thank you in advance.
>> >
>> > 73
>> >
>> > Pedro CT2GET
>> >
>> > ______________________________________________________________
>> > 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
>> >
>

John Ragle

Re: [K2] Sidetone has suddenly disappeared.

In reply to this post by Don Wilhelm-4

The little manuals by Nifty are excellent. I have used both the K2 and
K3 versions. These are about as "comprehensive" as necessary, as well as
durable and "handy."

http://www.niftyaccessories.com/Elecraft_RefGuide.htm

John Ragle -- W1ZI

=====

On 7/28/2011 10:32 AM, Don Wilhelm wrote:
> It would be nice if some enterprising K2 owner would write a
> comprehensive K2 Owner's Manual since many K2s now are not owned by
> those who have built one. Is there anyone out there up to the task? I
> simply do not have the time to do that.

______________________________________________________________
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