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AF1: First Impressions

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DL9HDA-2

AF1: First Impressions

Hi,

same here. Poor performance.

73 - Holger, DL9HDA

Am 03.01.2011 22:23, schrieb Ken Alexander:
> Wow! All of that is just with the AF-1? I think I have a lot more
> tweaking to do because I wasn't getting that kind of performance with
> it. I'll keep trying and let you know.
>
> Thanks for the demo.
>
> 73 - Ken, VE3HLS
>
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stan levandowski

AF1: First Impressions

I also recently completed an AF1 for my KX1 and I too am very impressed
with it.

I made a short 45 second demo at:
http://www.youtube.com/watch?v=9zTE-xEocO4

Stan Levandowski WB2LQF
HF QRP CW -- Doing more with less for over 50 years!
QCWA #35038 OOTC #4558 NAQCC #4740 SKCC #6488 FISTS #14992 QRP
ARCI #14321
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Ken Alexander-2

Re: AF1: First Impressions

Wow! All of that is just with the AF-1? I think I have a lot more tweaking to do because I wasn't getting that kind of performance with it. I'll keep trying and let you know.

Thanks for the demo.

73 - Ken, VE3HLS

--- On Mon, 1/3/11, stan levandowski <[hidden email]> wrote:

> From: stan levandowski <[hidden email]>
> Subject: [Elecraft] AF1: First Impressions
> To: [hidden email]
> Date: Monday, January 3, 2011, 1:14 PM
> I also recently completed an AF1 for
> my KX1 and I too am very impressed
> with it.
>
> I made a short 45 second demo at:
> http://www.youtube.com/watch?v=9zTE-xEocO4
>
> Stan Levandowski WB2LQF
> HF QRP CW -- Doing more with less for over 50 years!
> QCWA #35038   OOTC
> #4558   NAQCC #4740   SKCC
> #6488   FISTS #14992 QRP
> ARCI #14321
> ______________________________________________________________
> 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
>

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RobertG

Re: AF1: First Impressions

In reply to this post by DL9HDA-2

Is the audio filtering of the AF1 any different from the audio filters
of the K2 DSP unit? Is this just a matter of the AF1 being an outboard
unit focused on audio filtering compared to the K2DSP unit being
inboard [specifically for the K2] and using digital signal processing?

...robert

On 1/3/2011 21:50, dl9hda wrote:

> Hi,
>
> same here. Poor performance.
>
> 73 - Holger, DL9HDA
>
>
> Am 03.01.2011 22:23, schrieb Ken Alexander:
>> Wow! All of that is just with the AF-1? I think I have a lot more
>> tweaking to do because I wasn't getting that kind of performance with
>> it. I'll keep trying and let you know.
>>
>> Thanks for the demo.
>>
>> 73 - Ken, VE3HLS
>>
> ______________________________________________________________
> 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
>

--
Robert G. Strickland, PhD, ABPH - KE2WY
[hidden email]
Syracuse, New York, USA
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Don Wilhelm-4

Re: AF1: First Impressions

Robert,

The AF1 is an audio filter, not DSP based, so it is comparable to the
KAF2. The AF1 has the added advantage of a variable center frequency.
Yes, the KAF2 also has a variable center frequency (with 2 pots), but it
is not a "Front Panel" control, once it is set, it cannot be varied at will.

73,
Don W3FPR

On 1/3/2011 5:06 PM, Robert G. Strickland wrote:

> Is the audio filtering of the AF1 any different from the audio filters
> of the K2 DSP unit? Is this just a matter of the AF1 being an outboard
> unit focused on audio filtering compared to the K2DSP unit being
> inboard [specifically for the K2] and using digital signal processing?
>
> ...robert
>
>
> On 1/3/2011 21:50, dl9hda wrote:
>> Hi,
>>
>> same here. Poor performance.
>>
>> 73 - Holger, DL9HDA
>>
>>
>> Am 03.01.2011 22:23, schrieb Ken Alexander:
>>> Wow! All of that is just with the AF-1? I think I have a lot more
>>> tweaking to do because I wasn't getting that kind of performance with
>>> it. I'll keep trying and let you know.
>>>
>>> Thanks for the demo.
>>>
>>> 73 - Ken, VE3HLS
>>>
>> ______________________________________________________________
>> 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
>>

RobertG

Re: AF1: First Impressions

Don...

I take your answer to say that "in the ear" there's no significant
difference. What difference there is in the form factor and various
adjustments. Yes?

...robert

On 1/3/2011 22:41, Don Wilhelm wrote:

> Robert,
>
> The AF1 is an audio filter, not DSP based, so it is comparable to the
> KAF2. The AF1 has the added advantage of a variable center frequency.
> Yes, the KAF2 also has a variable center frequency (with 2 pots), but it
> is not a "Front Panel" control, once it is set, it cannot be varied at
> will.
>
> 73,
> Don W3FPR
>
> On 1/3/2011 5:06 PM, Robert G. Strickland wrote:
>> Is the audio filtering of the AF1 any different from the audio filters
>> of the K2 DSP unit? Is this just a matter of the AF1 being an outboard
>> unit focused on audio filtering compared to the K2DSP unit being
>> inboard [specifically for the K2] and using digital signal processing?
>>
>> ...robert
>>
>>
>> On 1/3/2011 21:50, dl9hda wrote:
>>> Hi,
>>>
>>> same here. Poor performance.
>>>
>>> 73 - Holger, DL9HDA
>>>
>>>
>>> Am 03.01.2011 22:23, schrieb Ken Alexander:
>>>> Wow! All of that is just with the AF-1? I think I have a lot more
>>>> tweaking to do because I wasn't getting that kind of performance with
>>>> it. I'll keep trying and let you know.
>>>>
>>>> Thanks for the demo.
>>>>
>>>> 73 - Ken, VE3HLS
>>>>
>>> ______________________________________________________________
>>> 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: AF1: First Impressions

Robert,

The form factor is quite different. The AF1 is a standalone filter that
can be used with any receiver, and the KAF2 mounts inside the K2. The
switch on the AF1 permits selection of no filter, low pass only, one
filter stage, or two filter stages, and the center frequency is
continuously varaible using the control.
With the KAF2, the low pass filter is in all the time (unless you
operate the switch inside the K2), and the center frequency is set to
whatever you adjust it to - presumably your sidetone pitch.

In other words, the AF1 has more controls available from the "Front
Panel" than the KAF2.
If you set the AF1 center frequency to your sidetone pitch and do not
touch it after that, and never use the switch selection that bypasses
the filter, then the two will be the same "in the ear".

73,
Don W3FPR

On 1/3/2011 5:58 PM, Robert G. Strickland wrote:

> Don...
>
> I take your answer to say that "in the ear" there's no significant
> difference. What difference there is in the form factor and various
> adjustments. Yes?
>
> ...robert
>
>
> On 1/3/2011 22:41, Don Wilhelm wrote:
>> Robert,
>>
>> The AF1 is an audio filter, not DSP based, so it is comparable to the
>> KAF2. The AF1 has the added advantage of a variable center frequency.
>> Yes, the KAF2 also has a variable center frequency (with 2 pots), but it
>> is not a "Front Panel" control, once it is set, it cannot be varied at
>> will.
>>
>> 73,
>> Don W3FPR
>>
>> On 1/3/2011 5:06 PM, Robert G. Strickland wrote:
>>> Is the audio filtering of the AF1 any different from the audio filters
>>> of the K2 DSP unit? Is this just a matter of the AF1 being an outboard
>>> unit focused on audio filtering compared to the K2DSP unit being
>>> inboard [specifically for the K2] and using digital signal processing?
>>>
>>> ...robert
>>>
>>>
>>> On 1/3/2011 21:50, dl9hda wrote:
>>>> Hi,
>>>>
>>>> same here. Poor performance.
>>>>
>>>> 73 - Holger, DL9HDA
>>>>
>>>>
>>>> Am 03.01.2011 22:23, schrieb Ken Alexander:
>>>>> Wow! All of that is just with the AF-1? I think I have a lot more
>>>>> tweaking to do because I wasn't getting that kind of performance with
>>>>> it. I'll keep trying and let you know.
>>>>>
>>>>> Thanks for the demo.
>>>>>
>>>>> 73 - Ken, VE3HLS
>>>>>
>>>> ______________________________________________________________
>>>> 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
>>>>
>>
>