Ralf and Christophe,
Yes, what you say is true, but the answer is still in the filter alignment.
All the SSB filters should be aligned - AND - in many (most) K2s built
in the last several years, the suggested settings for the SSB filters
other than the OP1 BFOs do not work well. That is because the varactors
have changed (the type has not changed, but the capacity range has
increased - blame the manufacturer!).
The result of this varactor variation is that the filter width displayed
by the K2 is usually much more narrow than the actual width (not true
for the OP1 filter which has no varactors). I do not know of any way to
easily find the actual width of the filter other than using an audio
spectrum analyzer like Spectrogram.
73,
Don W3FPR
On 5/20/2013 1:25 PM, Ralf Wilhelm wrote:
Hi, Christophe and Don,
There is a point I don't understand: The K2 switches to "VFO below rx frequency" on 15
and above (main manual page 85) thus resulting in sideband "inversion". So, if Christophe
can receive USB on 15, shouldn't that mean that the BFO is properly set for LSB reception on 17 and
below? If he can also receive USB on 20, shouldn't that mean that both BFO settings are ok?
Greetings
Ralf, DL6OAP
Am 20.05.2013 um 17:41 schrieb Christophe F8ACF-56 <f8ac...@yahoo.fr>:
Hello Don,
I will review it with the page of your site, the problem for me I think is a
misunderstanding of the text in your language, but the idea is to learn your
language :-)
I'll let you know as well as the list of results
thank you again for your help !
73 , Christophe F8ACF-56
________________________________
De : Don Wilhelm <w3...@embarqmail.com>
À : Christophe F8ACF-56 <f8ac...@yahoo.fr>
Cc : "elecraft@mailman.qth.net" <elecraft@mailman.qth.net>
Envoyé le : Lundi 20 mai 2013 17h15
Objet : Re: [Elecraft] K2 and SSB
Christophe,
The usual cause is that the LSB BFOs are not set up properly.
I strongly urge the use of Spectrogram or other audio spectrum analyzer
to see where the filter passband is placed.
See part 3 on the K2 Dial Calibration article on my website
www.w3fpr.com. If you need to obtain Spectrogram, look near the bottom
of the opening page on my website for the link.
73,
Don W3FPR
On 5/20/2013 10:45 AM, Christophe F8ACF-56 wrote:
Hello to all,
since I installed my KSB2 I correctly RECEIVE SSB only on 14 MHz and 21 MHz 7
is not clear on closer understanding is CW, although this may not be entirely
clear.
I would say it is like when you are in AM and you listen a "SSB station"
thank you for your help
K2 # 7369
73 , Christophe F8ACF-56
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