[Elecraft] Phase noise

[Leigh L Klotz, Jr.]

Adi,
It looks like you have a small piece of copper and two grounds, one 
taken from the far side of the processor and the other from somewhere 
behind that electrolytic capacitor.  Could you let us know if that is 
correct and which tie points you used?  Also, did you insulate the 
copper on the bottom or are you depending on wire stiffness to keep it 
from touching?
73,
Leigh / WA5ZNU

On Sat, 19 Mar 2005 4:12 pm, S55M wrote:
> Hello everyone!
>
>> From one debate we went to two different ones.
> While on the beginning we were talking about K2's TX noise and birdies 
> on
> SSB now we are talking on another subject which is interference of 
> magnetic
> fields on K2's behavior.
> Let's see the noise and birdies problem first.
> I found the surce of birdies is the clock signal (maybe the 4Mhz osc 
> itself
> also contributes to this) on KSB2 wich goes from pin 14 on U1 to pin 2 
> of
> U2.This signal is interfering directly to Q2 and some birdies are well 
> heard
> on the band HI.
> So what i tried to do is simply to shield a bit the path betwen the 
> U1+U2 to
> Q2. The result is that the strongest bird (Fc 14.250MHz 
> Fbirdie14.148MHz
> went down by 10dB (and i suppose all the others went down for the same
> ammount) Maybe 10dB seams little but for me evry dB is important.
> Picture of my KSB2 can be found at
> http://www.s55m.com/teh/images/ksb2.jpg
> Test eq:
>
> K2 itself TX output at transverter port (jumper W6) at +6dBm (for 
> birdies
> without modulated signal but checked also with SSB modulation wich do 
> not
> affect birdies as far away HI)
> RX TS930S on CW 500Hz filter AGC OFF
> NF Siemens U2032 Gerauschspannungmesser (psophometer) BW 300-3400 Hz
> range -70 to +40dB
>
> 73's
> S55M-Adi
>
> ----- Original Message -----
> From: "S55M" <s55m at siol.com>
> To: "Elecraft" <elecraft at mailman.qth.net>
> Sent: Saturday, March 19, 2005 2:46 PM
> Subject: [Elecraft] Phase noise
>
>
> Hello again Elecrafters!
>
> Yes Fraser i saw Your comment but not the comments of others.We are 
> still in
> very low number.
> Seams that only Europians have the problems with "little" birdies and
> noises.
> And between Europians S5 is a little country with a lot of ham-radio
> activity HI.
> In what kind of place do we live is Bob asking?
> In a place of 300*300 km (186*186 miles if You are more familiar with 
> that).
> And during VHF ctests there are at least 10 stations with full legal 
> limit
> power and "average" distance between them is abt 35 miles (worst case 
> 23
> miles) what in terms of path loss is "only" -110dB in free space on 
> 144MHz
> (there is a line of sight between us !!!).
> Now all of us use "Javornik" 144/14Mhz transverters designed by S53WW  
> and
> the situation is not so bad as before with all sorts of stuff.The only
> important thing now is to have bullet-proof HF RX (K2 shurely is) and a
> clean HF TX.
> I will enjoy in comments.And i understand that is difficult to deal 
> with
> the problem if you live in MBA (Mighty Big America).
>
>
> S55M-Adi
>
>
> P.S.
> I was trying to send this several times to the list. Hope that it will 
> get
> trough now.
> _______________________________________________
> Elecraft mailing list
> Post to: Elecraft at mailman.qth.net
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
>  http://mailman.qth.net/mailman/listinfo/elecraft
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>
> _______________________________________________
> Elecraft mailing list
> Post to: Elecraft at mailman.qth.net
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
>  http://mailman.qth.net/mailman/listinfo/elecraft
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com