Posted by
k.igor on
Apr 23, 2011; 5:27pm
URL: http://elecraft.85.s1.nabble.com/Info-on-K3-IF-OUT-tp6299452p6299814.html
John,
Something is confusing in your post. If you want to sample IF directly, you
would need ADC with sampling rate of at least 18MHz or so. (more than twice
the 8.215MHz IF of K3). Your 192kHz doesn't make sense. P3 digitizing at 60
MHz because they want to allow using it with other rigs with IF up to 21 MHz
or so.
Maybe you can explain your setup in more detail.
73,
Igor, N1YX
-----Original Message-----
From:
[hidden email]
[mailto:
[hidden email]] On Behalf Of John Ragle
Sent: Saturday, April 23, 2011 12:11 PM
To:
[hidden email]
Cc:
[hidden email]
Subject: Re: [Elecraft] Info on K3 "IF OUT"
In part, my reason for asking is the following...
I am feeding the K3 IF Out into a fast ADC at 192 kHz, followed by a
Winloe detector, etc. for panoramic viewing, but despite the 192 kHz
sampling frequency I am only getting about 44 kHz TOTAL spectral width.
Thus, there seems to be a front-end bandwidth of about +/- ~25 kHz. Is
this true? Or am I doing something wrong?
The P3 comes up with a TOTAL spectral width of ~200 kHz. Where does it
pick its signal from?
John Ragle -- W1ZI
=====
On 4/23/2011 11:44 AM,
[hidden email] wrote:
> It is a wideband, low-level signal. The bandwidth is just limited by the
> front-end filters in the K3. The level is about 7 dB less than the level
> at the K3 antenna input (preamp and attenuator off). On older K3s that
> don't have the IF OUT modification the level is less than that, by about
> 8-10 dB as I recall.
>
> Alan N1AL
>
>
>> Aside from the frequency, I can find nothing about the characteristics
>> of the K3 "IF OUT" feed. Could some kind person provide info about
>> bandwidth, levels, etc...?
>>
>> John Ragle -- W1ZI
>> ______________________________________________________________
>> 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>>
>>
>
>
>
>
>
______________________________________________________________
Elecraft mailing list
Home:
http://mailman.qth.net/mailman/listinfo/elecraftHelp:
http://mailman.qth.net/mmfaq.htmPost: mailto:
[hidden email]
This list hosted by:
http://www.qsl.netPlease help support this email list:
http://www.qsl.net/donate.html______________________________________________________________
Elecraft mailing list
Home:
http://mailman.qth.net/mailman/listinfo/elecraftHelp:
http://mailman.qth.net/mmfaq.htmPost: mailto:
[hidden email]
This list hosted by:
http://www.qsl.netPlease help support this email list:
http://www.qsl.net/donate.html