[Elecraft] K2 and SSB

[Ralf Wilhelm]

Don,

OK, didn't know that...
I have to admit I didn't build my K2 myself but bought a used one. The guy who sold it to me actually has done what is described on your page, the rig was delivered with some kind of "test protocol" that includes a "filter response" measured with your approach. 

Germany's QST equivalent "cq DL" also described this method a few months ago, I think the author was the "official" german Elecraft importer DL2FI...

Vy 73

Ralf, DL6OAP


Am 20.05.2013 um 19:59 schrieb Don Wilhelm <w3fpr at embarqmail.com>:

> 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 <f8acf56 at 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 <w3fpr at embarqmail.com>
>>> À : Christophe F8ACF-56 <f8acf56 at yahoo.fr>
>>> Cc : "elecraft at mailman.qth.net" <elecraft at 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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