Re: [Elecraft] K2 #5549 some questions/remarks

[Jurgen ON5MF]

Hi everyone,

thanks for the replies so far.

No the spurious we see are not due to overloading of the spectrum 
analyser. They are really there! We saw them on 30, 12 and 10m, the 
other bands were a lot 'cleaner'.


We (ON7KZ and I) have no time to get into it in the first few days but 
the file http://www.qslnet.de/member/la3za/K2/BpfDL7MAJ.pdf seems pretty 
helpful.


More info to follow here or on my homepage.

Any hints or tips are still welcome!

[EMAIL PROTECTED] wrote:
In a message dated 25/12/06 10:53:49 GMT Standard Time, 
[EMAIL PROTECTED] writes:


1. when looking at the transmitted signal using a spectrum analyser,
  the signal didn't seem as clean as we liked it.  We didn't have
  time (it was the day before X-mas!) to really start counting the
  dB's, but on 30, 12 and 10 m we saw some signals around the main
  signal. Is there any chance we can get these bands 'cleaner' by
  further tweaking the filters?

-
 
Hi Jurgen,
 
Are you 100% sure that the spurii you are seeing are just not due to 
you overloading the input of the spectrum analyser?
 
This is a common cause of apparent excessive spurii!
 
Merry Christmas to all,
 
Bob, G3VVT


--

73

Jurgen Geldhof
ON5MF

[EMAIL PROTECTED] 



my site:www.on5mf.be   

our club:   www.ktk.be 

the Belgian Amateur Radio Society:  www.uba.be 


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Re: [Elecraft] K2 #5549 some questions/remarks

[Wyn Hughes]

A few months ago, after completing #5390, I ran a check on the cleanliness of 
the K2 transmitted CW signal on 28Mhz, using the spectrum scope in my IC-781 as 
a spectrum analyser. I could not detect any trace of spurii and the slopes of 
the received trace were sharp and smooth, with the scope set to 5Khz per 
division. Signal also sounded clean and pure to listen to.

I had to set up a high degree of 'attenuation' between the K2/dummy load and 
the IC-781 (with a wire antenna about 1 ft long), which I did by having the K2 
running dits into the dummy load in one room of our apartment, and the IC-781 
in another room some distance away. If you try this, take care to arrange 
enough proper attenuation, to avoid the risk of blowing the RF stage or 
switching diodes in your RX!

73 and Happy Holidays to all,

Wyn, VR2AX





In a message dated 25/12/06 10:53:49 GMT Standard Time,  
[EMAIL PROTECTED] writes:

1. when  looking at the transmitted signal using a spectrum analyser,
the signal didn't seem as clean as we liked it.  We didn't  have
time (it was the day before X-mas!) to really  start counting the
dB's, but on 30, 12 and 10 m we saw  some signals around the main
signal. Is there any  chance we can get these bands 'cleaner' by
further  tweaking the filters?



-
 
Hi Jurgen,
 
Are you 100% sure that the spurii you are seeing are just not due to you  
overloading the input of the spectrum analyser?
 
This is a common cause of apparent excessive spurii!
 
Merry Christmas to all,
 
Bob, G3VVT
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RE: [Elecraft] K2 #5549 some questions/remarks

[Ron D'Eau Claire]

Hi, Jurgen:

Regarding 10 meters, the specifications say the K2 will deliver at least 10
watts from 28.0 to 28.8 MHz - a range of 800 kHz. It is not designed to
cover the whole 10 meter band. I'm not sure where you see the power drop
off, but if it's making 10 watts at 28.8 MHz it's working within spec. 

Ron AC7AC

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Jurgen ON5MF
Sent: Sunday, December 24, 2006 11:43 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] K2 #5549 some questions/remarks


Hi,

First of all Merry Christmas to all of you!

Yesterday I went over to a friend and we did some quick tests on my new 
K2 (basic, no options yet).

To be clear, everything has been aligned with basic tools, as in the 
user manual.

Here are some things we noticed:

   1. when looking at the transmitted signal using a spectrum analyser,
  the signal didn't seem as clean as we liked it.  We didn't have
  time (it was the day before X-mas!) to really start counting the
  dB's, but on 30, 12 and 10 m we saw some signals around the main
  signal. Is there any chance we can get these bands 'cleaner' by
  further tweaking the filters?

   2. Output power on 10m is OK low in the band, but when going higher
  up it decreases to a mere 1,5 W. Moreover the higher we go in the
  band the worse the transmitted spectrum gets (see above). Is it
  possible to set the filters so the complete 10m band can be used
  at a reasonable power? I know, for CW the low part of the band is
  the place to be, but I'd like to also install the SSB option.

   3. When listening to a continuous signal (XG2 for example) there is
  some kind of a (digital) 'thump' in the audio everytime I turn RIT
  or VFO. Is this a normal behaviour or not?


-- 

73

Jurgen Geldhof
ON5MF

[EMAIL PROTECTED] 



my site:www.on5mf.be 

our club:   www.ktk.be   

the Belgian Amateur Radio Society:  www.uba.be



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RE: [Elecraft] K2 #5549 some questions/remarks

[Don Wilhelm]

Jurgen,

If you peak the 10 meter bandpass filter at 28.4 MHz, you will have greater
power output at 28.8 MHz.
Note that the specified 10 meter band coverage for the K2 is 28.0 to 28.8
MHz.  Above that range, the output power is expected to decrease.

There are mods to increase the 10 meter bandpass filter width if you should
choose to do that.  See http://www.qslnet.de/member/la3za/K2/mod.html for
more information.

73,
Don W3FPR

> -Original Message-
>2. Output power on 10m is OK low in the band, but when going higher
>   up it decreases to a mere 1,5 W. Moreover the higher we go in the
>   band the worse the transmitted spectrum gets (see above). Is it
>   possible to set the filters so the complete 10m band can be used
>   at a reasonable power? I know, for CW the low part of the band is
>   the place to be, but I'd like to also install the SSB option.

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Re: [Elecraft] K2 #5549 some questions/remarks

[G3VVT]

 
In a message dated 25/12/06 10:53:49 GMT Standard Time,  
[EMAIL PROTECTED] writes:

1. when  looking at the transmitted signal using a spectrum analyser,
the signal didn't seem as clean as we liked it.  We didn't  have
time (it was the day before X-mas!) to really  start counting the
dB's, but on 30, 12 and 10 m we saw  some signals around the main
signal. Is there any  chance we can get these bands 'cleaner' by
further  tweaking the filters?



-
 
Hi Jurgen,
 
Are you 100% sure that the spurii you are seeing are just not due to you  
overloading the input of the spectrum analyser?
 
This is a common cause of apparent excessive spurii!
 
Merry Christmas to all,
 
Bob, G3VVT
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