Re: [Elecraft] K2 with 144Mhz transverter - phase noise
Martin ,for the bad results of K2+Transverter probably both of them contributed. My first try with transverter+K2 was in Marconi CW contest (November 2004).Before that i used FT1KMP and Javornik transverter. Other stations told me, that i was very noisy over a whole 2m band while on TX. At that time i was using for TX IF input ,output from TX of 10W K2 reduced with power button and adequate attenuator to bring it down to 1mW needed for transverter input.It was a horrible choice i realised. Now i am using the 1mW signal directly after first bufer (like XV144 does) and still got to test the noise with carrier on and with unmodulated signal..hope it will be ok... Maybe for someone is strange that a bit of noise is heard, but in S5 and generaly in central Europe the density of crowded band is unbelivable (several Kw stations on hilltops almost touching ich other with antennas HI HI) so the clear TX and bullet-proof RX is extremly important for contesting. All ideas and tips and tricks are wellcome :) s55m-Adi - Original Message - From: Martin Kratoska [EMAIL PROTECTED] To: Fraser Robertson [EMAIL PROTECTED] Cc: [EMAIL PROTECTED]; elecraft@mailman.qth.net Sent: Friday, March 11, 2005 1:55 AM Subject: Re: [Elecraft] K2 with 144Mhz transverter - phase noise it would be quite interesting to know where is the culprit - if K2 or the transverter 73 Martin OK1RR Fraser Robertson napsal(a): Adi, I've compared two latest spec. K2/100's with a FT1KMP, TS870, and a home brew VFO/Xtal mixer rig, and the close in TX phase noise (unkeyed carrier) of the K2's is worse than the other rigs. I think the figure you quote is probably typical. If there is a way to improve on this I'd love to know as in many respects the K2 is a great rig and I'd like to use it for QRO contesting. (I have not used a transverter). 73 Fraser G4BJM NF 6dB, IP3 -26 dBm and TX noise at least 10dB greater than FT1KMP. For those who r not familiar with this data I can only say that are badbut how??? I suppose the transverter was always the same. Why? How? TNX for answers... S55M-Adi _ Express yourself instantly with MSN Messenger! Download today - it's FREE! http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/ ___ Elecraft mailing list Post to: Elecraft@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@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
Re: [Elecraft] K2 with 144Mhz transverter
It looks like your RBW is way too high, which will increase the apparent noise level by a large amount. It should be set to 100 Hz also. Set your sweep to auto so it will go slowly enough to make the measurement. It will take some time for the sweep. 73, Eric S55M wrote: Hy Eric! Thanks for Your answer. The measurment setup is : VBW 100Hz RBW 10kHz Span 500KHz Any ideas what went wrong Adi - Original Message - From: Eric Swartz - WA6HHQ, Elecraft [EMAIL PROTECTED] To: S55M [EMAIL PROTECTED] Cc: Elecraft elecraft@mailman.qth.net Sent: Thursday, March 10, 2005 6:53 PM Subject: Re: [Elecraft] K2 with 144Mhz transverter Hi Adi, There must be something wrong with your K2 or measurement set up. As can be seen from the phase noise plot on our web page (under radio comparisons) the K2 TX signal is better than -130 dBc when you get 10-20 kHz away from the carrier. Also, what b/w and span were you using on your 8590 analyzer? On the receive side the XV and K2 pair are among the best out there. I do not know what was different about his set up. 73, Eric S55M wrote: OK...now I'm getting really angry HI HI :))... First the transmitter (easy one) I made a measurment with my HP8590A of the transmitted signal from K2 to transwerter (signal after the first buffer). When i moove 100 KHz away from carier there is -73dBc of signal remaining. After a little bit of conversation with local gurus probably this not to good number (compared dBc's of other same 1.st class rtx's are -90 to -100dBc) ___ Elecraft mailing list Post to: Elecraft@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@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
Re: [Elecraft] K2 with 144Mhz transverter
Hi Adi, When I take a look at http://hft.fh-pforzheim.de/trxtest/Messergebnis/TRX_Messung_2_2005.xls and not the PDF, I wonder which transverter was used with the K2. The pictures http://hft.fh-pforzheim.de/trxtest/Photos_DK9IP/page_01.htm would seem to indicate that the transverter was from Elecraft. Very interesting results indeed. vy 73 de toby ___ Elecraft mailing list Post to: Elecraft@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
Re: [Elecraft] K2 with 144Mhz transverter
OK...now I'm getting really angry HI HI :))... First the transmitter (easy one) I made a measurment with my HP8590A of the transmitted signal from K2 to transwerter (signal after the first buffer). When i moove 100 KHz away from carier there is -73dBc of signal remaining. After a little bit of conversation with local gurus probably this not to good number (compared dBc's of other same 1.st class rtx's are -90 to -100dBc) Is it possible to improve K2's local osc noise and purity??? Thank's Adi mit VV is a german term for with preamplifier. ohne VV is without preamplifier. For the bad data you have to know, every K2 is very special. Do you know, how well the allignement of the basic K2 was done? And the transverter: was it well build and is everything ok? 73 de DH8DAP, Frank from Schwelm nr Cologne, JO31PG (working on K2 #4770) And the link to measurments page: http://hft.fh-pforzheim.de/trxtest/Messergebnis/TRX_Messung_2_2005.pdf I dont know what does it mean K2 mit VV (K2 with? maybe Vor Verstarker) Still noone want to comment? K2 is top preformance rtx and should show better numbers Or not? S55M-Adi - Original Message - From: S55M [EMAIL PROTECTED] To: Elecraft elecraft@mailman.qth.net Sent: Thursday, March 10, 2005 2:04 AM Subject: [Elecraft] K2 with 144Mhz transverter Please some comments: I had information that DK8SG measured some HF transcievers K2 included with 2m transverter and got this data for K2: NF 6dB, IP3 -26 dBm and TX noise at least 10dB greater than FT1KMP. For those who r not familiar with this data I can only say that are badbut how??? I suppose the transverter was always the same. Why? How? TNX for answers... S55M-Adi ___ Elecraft mailing list Post to: Elecraft@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
Re: [Elecraft] K2 with 144Mhz transverter
Hi Adi, There must be something wrong with your K2 or measurement set up. As can be seen from the phase noise plot on our web page (under radio comparisons) the K2 TX signal is better than -130 dBc when you get 10-20 kHz away from the carrier. Also, what b/w and span were you using on your 8590 analyzer? On the receive side the XV and K2 pair are among the best out there. I do not know what was different about his set up. 73, Eric S55M wrote: OK...now I'm getting really angry HI HI :))... First the transmitter (easy one) I made a measurment with my HP8590A of the transmitted signal from K2 to transwerter (signal after the first buffer). When i moove 100 KHz away from carier there is -73dBc of signal remaining. After a little bit of conversation with local gurus probably this not to good number (compared dBc's of other same 1.st class rtx's are -90 to -100dBc) ___ Elecraft mailing list Post to: Elecraft@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
Re: [Elecraft] K2 with 144Mhz transverter
Hy Eric! Thanks for Your answer. The measurment setup is : VBW 100Hz RBW 10kHz Span 500KHz Any ideas what went wrong Adi - Original Message - From: Eric Swartz - WA6HHQ, Elecraft [EMAIL PROTECTED] To: S55M [EMAIL PROTECTED] Cc: Elecraft elecraft@mailman.qth.net Sent: Thursday, March 10, 2005 6:53 PM Subject: Re: [Elecraft] K2 with 144Mhz transverter Hi Adi, There must be something wrong with your K2 or measurement set up. As can be seen from the phase noise plot on our web page (under radio comparisons) the K2 TX signal is better than -130 dBc when you get 10-20 kHz away from the carrier. Also, what b/w and span were you using on your 8590 analyzer? On the receive side the XV and K2 pair are among the best out there. I do not know what was different about his set up. 73, Eric S55M wrote: OK...now I'm getting really angry HI HI :))... First the transmitter (easy one) I made a measurment with my HP8590A of the transmitted signal from K2 to transwerter (signal after the first buffer). When i moove 100 KHz away from carier there is -73dBc of signal remaining. After a little bit of conversation with local gurus probably this not to good number (compared dBc's of other same 1.st class rtx's are -90 to -100dBc) ___ Elecraft mailing list Post to: Elecraft@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
