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What happened to AM mode?

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Mike Scott-7

What happened to AM mode?

After uploading new firmware 1.77 and 1.58, AM mode has highly distorted
audio. I can listen to a strong AM station in sideband mode but AM, no way.
All I hear is some muffled low frequency audio.

Also as I look at VFO A, I see 0.640 MHz (local AM station) but VFO B shows
14.181.23 MHz. I guess this means we can work cross band. I don't remember
seeing this before.

AM mode used to work but not now.

Mike Scott - AE6WA
Tarzana, CA (DM04 / near LA)
K3-100 #508/ KX1 #1311

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k7svv

Re: What happened to AM mode?

The following is the contents of a message that I have sent to the Elecraft
K3 Support group.
===============================
Since someone else has reported experiencing problems with AM mode with the
177/158 code on the Elecraft reflector, I would like to tell you what I saw
after installing 1.75/1.57 (1.77/1.58 has not been installed here yet). I
did not hear the " highly distorted audio" that he heard but I did detect a
small, but very noticeable, amount of clipping on voice peaks while
listening to the standard broadcast band. Reducing the AF gain down to
where the audio could barely be heard did not reduce the amount of clipping
so it must be happening in an earlier stage.

I can also hear on the stronger stations some heterodyning in both the lower
and upper sidebands (the K3 was in AM mode). It isn't loud but it is most
definitely there and it starts at about 300 to 400 Hz below and above the
zero beat frequency. On one local station the heterodyne sounded almost
like CW. As the announcer spoke, the heterodyne would be turned off and
between words it would return. As I recall , this occurred in the lower
sideband while the upper sideband had a continuous heterodyne.

The other fellow commented that his VFO A was in the AM broadcast band while
VFO B was in the 20 meter band. I really don't understand the conditions
that caused this but I can say that from time to time after installing new
F/M code in s/n 148 I have had to manually go through the sequence of bands
and adjust them so that both VFO's for all bands are indeed in the proper
band. This usually manifests itself in the 40 and 60 meter bands,
Typically the 60 meter band will have a 40 meter frequency in VFO A and a 60
meter frequency in VFO B. The opposite will be true in the 40 meter band.

John [K7SVV]

----- Original Message -----
From: "Mike Scott" <[hidden email]>
To: <[hidden email]>
Sent: Wednesday, March 19, 2008 4:52 AM
Subject: [Elecraft] What happened to AM mode?

> After uploading new firmware 1.77 and 1.58, AM mode has highly distorted
> audio. I can listen to a strong AM station in sideband mode but AM, no
> way.
> All I hear is some muffled low frequency audio.
>
> Also as I look at VFO A, I see 0.640 MHz (local AM station) but VFO B
> shows
> 14.181.23 MHz. I guess this means we can work cross band. I don't remember
> seeing this before.
>
> AM mode used to work but not now.
>
> Mike Scott - AE6WA
> Tarzana, CA (DM04 / near LA)
> K3-100 #508/ KX1 #1311
>

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M0XDF

Re: What happened to AM mode?

Would you mind expanding on the below - in what way are you adjusting
the Bands to VFO? I assume this is some configuration procedure, but I
can't figure out which one.
73 de M0XDF, K3 #174
--
Extraordinary claims require extraordinary evidence.
-Carl Sagan, astronomer and author (1934-1996)

On 20 Mar 2008, at 04:52, John [K7SVV] wrote:

> I really don't understand the conditions that caused this but I can
> say that from time to time after installing new F/M code in s/n 148
> I have had to manually go through the sequence of bands and adjust
> them so that both VFO's for all bands are indeed in the proper
> band. This usually manifests itself in the 40 and 60 meter bands,
> Typically the 60 meter band will have a 40 meter frequency in VFO A
> and a 60 meter frequency in VFO B. The opposite will be true in the
> 40 meter band.

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k7svv

Re: What happened to AM mode?

Well, for instance, if VFO A in the 40 meter band had a 60 meter frequency
and VFO B had a 40 meter frequency, I would press the A/B button to swap
the VFO's. At this point VFO A now contains a 40 meter frequency and VFO B
would have a 60 meter frequency. I would then press A>B to load VFO B with
VFO A's 40 meter frequency. Now both VFOs will have 40 meter frequencies
loaded.

Come to think of it, I also saw mismatched VFOs in the 30 meter band too
after updating the F/M code. I don't recall if I see this every time I
update the code or if it sometimes works okay. I will have to pay better
attention I guess.

John [K7SVV]

----- Original Message -----
From: "David Ferrington, M0XDF" <[hidden email]>
To: "John [K7SVV]" <[hidden email]>
Cc: <[hidden email]>; <[hidden email]>
Sent: Thursday, March 20, 2008 1:33 AM
Subject: Re: [Elecraft] What happened to AM mode?

> Would you mind expanding on the below - in what way are you adjusting the
> Bands to VFO? I assume this is some configuration procedure, but I can't
> figure out which one.
> 73 de M0XDF, K3 #174
> --
> Extraordinary claims require extraordinary evidence.
> -Carl Sagan, astronomer and author (1934-1996)
>
> On 20 Mar 2008, at 04:52, John [K7SVV] wrote:
>
>> I really don't understand the conditions that caused this but I can say
>> that from time to time after installing new F/M code in s/n 148 I have
>> had to manually go through the sequence of bands and adjust them so that
>> both VFO's for all bands are indeed in the proper band. This usually
>> manifests itself in the 40 and 60 meter bands, Typically the 60 meter
>> band will have a 40 meter frequency in VFO A and a 60 meter frequency in
>> VFO B. The opposite will be true in the 40 meter band.
>
>
>
> --
> No virus found in this incoming message.
> Checked by AVG. Version: 7.5.519 / Virus Database: 269.21.7/1335 - Release
> Date: 3/19/2008 9:54 AM
>
>

M0XDF

Re: What happened to AM mode?

oh, so your saying that you moved through the bands until you got to
40m, but the freq displayed for VFOA was one for 60m?
I think that was a bug once before.
--
The high minded man must care more for the truth than for what people
think. -Aristotle, philosopher (384-322 BCE)

On 20 Mar 2008, at 16:53, John [K7SVV] wrote:

> Well, for instance, if VFO A in the 40 meter band had a 60 meter
> frequency and VFO B had a 40 meter frequency, I would press the A/B
> button to swap the VFO's. At this point VFO A now contains a 40
> meter frequency and VFO B would have a 60 meter frequency. I would
> then press A>B to load VFO B with VFO A's 40 meter frequency. Now
> both VFOs will have 40 meter frequencies loaded.
>
> Come to think of it, I also saw mismatched VFOs in the 30 meter band
> too after updating the F/M code. I don't recall if I see this every
> time I update the code or if it sometimes works okay. I will have
> to pay better attention I guess.
>
> John [K7SVV]
>
> ----- Original Message ----- From: "David Ferrington, M0XDF" <[hidden email]
> >
> To: "John [K7SVV]" <[hidden email]>
> Cc: <[hidden email]>; <[hidden email]>
> Sent: Thursday, March 20, 2008 1:33 AM
> Subject: Re: [Elecraft] What happened to AM mode?
>
>
>> Would you mind expanding on the below - in what way are you
>> adjusting the Bands to VFO? I assume this is some configuration
>> procedure, but I can't figure out which one.
>> 73 de M0XDF, K3 #174
>> --
>> Extraordinary claims require extraordinary evidence.
>> -Carl Sagan, astronomer and author (1934-1996)
>>
>> On 20 Mar 2008, at 04:52, John [K7SVV] wrote:
>>
>>> I really don't understand the conditions that caused this but I
>>> can say that from time to time after installing new F/M code in s/
>>> n 148 I have had to manually go through the sequence of bands and
>>> adjust them so that both VFO's for all bands are indeed in the
>>> proper band. This usually manifests itself in the 40 and 60
>>> meter bands, Typically the 60 meter band will have a 40 meter
>>> frequency in VFO A and a 60 meter frequency in VFO B. The
>>> opposite will be true in the 40 meter band.
>>
>>
>>
>> --
>> No virus found in this incoming message.
>> Checked by AVG. Version: 7.5.519 / Virus Database: 269.21.7/1335 -
>> Release Date: 3/19/2008 9:54 AM
>>
>