K3 #656 alive

[oe9fwv]

hi all,

I am glad to tell you that I finished building my K3. I admire the work of all
who made this great piece of engineering possible. Building was easy and
quick, after building a K2+KAT100+KPA100 it was more like playing with
Lego.
(my 10 years old son had fun helping me sorting and unpacking parts, fitting
pieces together and looking for nuts and washers on the ground)
No part was missing.

There are some questions left. The first one:
I have a FM Filter, AM Filter, 2.7 Filter, 2.1 Filter and 500 Hz Filter.
I could find a Frequency offset on the 2.7 and 500 hz Filter but not on the
others. Does this mean there is no offset?

Next question: when I am in AM mode, the bandwidth shows 3.00 with FL2
enabled. With LSB it shows 6.00. btw, it sound great!


73! de Werner OE9FWV

--
Life is like photography. You develop the negative.


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[Don Wilhelm-4]

Werner,

The bandwidth displayed is the audio bandwidth.  A double sideband (AM)
signal with an RF or IF bandwidth of 6 kHz will contain only 3 kHz of
audio bandwidth.  That is an inherent characteristic of the modulation
method, not any limitation imposed by the K3.

To obtain 6 kHz audio bandwidth for an AM signal requires a 12 kHz IF
filter - the FM filter will do that, but the firmware to support it has
not been released yet - I believe it is coming soon.

OTOH, an SSB signal can contain an audio bandwidth equal to the IF
bandwidth.

73,
Don W3FPR

Dr. Werner Furlan wrote:
> Next question: when I am in AM mode, the bandwidth shows 3.00 with FL2
> enabled. With LSB it shows 6.00. btw, it sound great!
>
>
> 73! de Werner OE9FWV
>
>  
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