K2 in SS CW...
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I've been reading the posts from people commenting on their experiences with
the K2 is a "serious" contest environment. Here is just my 2 cents... I used my K2/100 and an FT1000D with the INRAD roofing filter mod in SO2R at WA7LT, low power. I think most people would agree that the FT1000D is a *fantastic* radio, and the roofing filter makes it even better. When listening on the FT1000D I noticed a little bit of high pitched hiss. It wasn't annoying, or detrimental to copy, but it was definitely there. Also, the filters (500hz CW) were superb. No ringing, and absolutely ZERO interference from close in stations who were 40db over 9. I felt that this was a better combination than the FT1000MP Mk V with roofing filter. The Mk V sometimes sounds muddy to me. Now, the K2/100. There was no high pitched hiss, and it wasn't muddy. Extremely easy on the ears, and great, smooth AGC. I also ran the K2/100 on the 500hz setting. The close in *LOUD* signals is where there was a definite deficiency vs the FT1000D. A local, K7OX, was running HP, just a few miles away. If I was anywhere within about 10khz of him, I could still hear him on the K2. The FT1000D was dead quiet right up next to him. IMO, this is the only problem with the K2's RX! I think maybe in a contest where there were more loud signals, it might become a significant problem. Perhaps the 160 contest in W1 or something. That being said, the K2/100 is a great radio! I could probably do a full on SO2R in CW with 2xK2/100's and not have a problem. But I'm sure I would prefer one of the "big" radios in the end. Just my observations from the weekend. -Chris KL9A _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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Nice post Chris. Tnx for the comparison with a known contest rig.
What I find amazing is that we're even comparing the K2 to an FT1000. That the $600 bone-stock K2 can truly run with the big boys (in this case, one that has been tricked out somewhat) is absolutely astounding. - Keith N1AS - - K2 5411 - ----Original Message----- From: Chris Hurlbut I used my K2/100 and an FT1000D with the INRAD roofing filter mod in SO2R at WA7LT, low power. The close in *LOUD* signals is where there was a definite deficiency vs the FT1000D. A local, K7OX, was running HP, just a few miles away. If I was anywhere within about 10khz of him, I could still hear him on the K2. The FT1000D was dead quiet right up next to him. IMO, this is the only problem with the K2's RX! _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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In reply to this post by Chris Hurlbut
Out of curiosity, did your K2 have the strong signal
modification of the 2 diodes between pins 4 and 6 on U-12? Geoff, K6TFZ --------------------------------------------------------- " . . . A local, K7OX, was running HP, just a few miles away. If I was anywhere within about 10khz of him, I could still hear him on the K2." _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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In reply to this post by Darwin, Keith
In view of this, and excuse me for not being an engineer in receiver design,
why is there not a roofing filter option for the K2. Is it just not possible in a single conversion rig? de Joe, aa4nn ------------------------------------------------------------------------ >The close in *LOUD* signals is where there was a definite deficiency vs >the FT1000D. A local, K7OX, was running HP, just a few miles away. If >I was anywhere within about 10khz of him, I could still hear him on the >K2. The FT1000D was dead quiet right up next to him. IMO, this is the >only problem with the K2's RX! _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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Joe,
To generalize - 'roofing filter' would be placed right after the first mixer for best effectiveness to strip off extraneous mixing products. The K2 is a single conversion design and the IF filter is placed right after the first mixer (there is a post-mixer amp there for good dynamic range) - so it serves both as the IF filter and the 'roofing filter'. In other words, yes a roofing filter 'does not compute' for a single conversion design. 73, Don W3FPR > -----Original Message----- > > In view of this, and excuse me for not being an engineer in > receiver design, > why is there not a roofing filter option for the K2. Is it just not > possible in > a single conversion rig? > de Joe, aa4nn > _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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Don,
Wasn't there talk a while back about someone replacing the Noise Blanker with another crystal filter? If it was switchable, like switching in and out the Noise Blanker, would that add to the shape of the skirts in the present crystal filter? Not sure about making up for any loss in the added filter though. Maybe set up this added filter for CW (400-600HZ) ? I still haul the K2 down to WP2Z. 73, N2TK, Tony -----Original Message----- From: [hidden email] [mailto:[hidden email]]On Behalf Of Don Wilhelm Sent: Wednesday, November 08, 2006 10:15 AM To: Joe-aa4nn; [hidden email] Subject: RE: [Elecraft] K2 Roofing Filter? Joe, To generalize - 'roofing filter' would be placed right after the first mixer for best effectiveness to strip off extraneous mixing products. The K2 is a single conversion design and the IF filter is placed right after the first mixer (there is a post-mixer amp there for good dynamic range) - so it serves both as the IF filter and the 'roofing filter'. In other words, yes a roofing filter 'does not compute' for a single conversion design. 73, Don W3FPR > -----Original Message----- > > In view of this, and excuse me for not being an engineer in > receiver design, > why is there not a roofing filter option for the K2. Is it just not > possible in > a single conversion rig? > de Joe, aa4nn > _______________________________________________ Elecraft mailing list Post to: [hidden email] 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: [hidden email] 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 |
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Since the NB occurs right before the existing Xtal filter, adding more
filtering in the NB slot would increase the skirts of the filter, but it wouldn't do a whole lot more. In other rigs with 2 filters, they are at different IFs and have other stages between them. Having a 2nd filter earlier in the signal chain helps to protect the RX from out of band signals. The K2 already does that by having the only filter be as early as possible. But, a cool option would be to have a narrow SSB filter that could go in that slot. That way you could configure your SSB adapter to have a wide Xtal filter for good sound and then add the narrow one for contests and tough band conditions without having to resort to the variable CW filter (which performs poorly at wide bandwidths). Of course, if you can live without your NB. I certainly can. - Keith N1AS - -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of N2TK, Tony Sent: Wednesday, November 08, 2006 10:32 AM To: [hidden email]; [hidden email] Subject: RE: [Elecraft] K2 Roofing Filter? Don, Wasn't there talk a while back about someone replacing the Noise Blanker with another crystal filter? If it was switchable, like switching in and out the Noise Blanker, would that add to the shape of the skirts in the present crystal filter? Not sure about making up for any loss in the added filter though. Maybe set up this added filter for CW (400-600HZ) ? I still haul the K2 down to WP2Z. 73, N2TK, Tony -----Original Message----- From: [hidden email] [mailto:[hidden email]]On Behalf Of Don Wilhelm Sent: Wednesday, November 08, 2006 10:15 AM To: Joe-aa4nn; [hidden email] Subject: RE: [Elecraft] K2 Roofing Filter? Joe, To generalize - 'roofing filter' would be placed right after the first mixer for best effectiveness to strip off extraneous mixing products. The K2 is a single conversion design and the IF filter is placed right after the first mixer (there is a post-mixer amp there for good dynamic range) - so it serves both as the IF filter and the 'roofing filter'. In other words, yes a roofing filter 'does not compute' for a single conversion design. 73, Don W3FPR > -----Original Message----- > > In view of this, and excuse me for not being an engineer in receiver > design, why is there not a roofing filter option for the K2. Is it > just not possible in a single conversion rig? > de Joe, aa4nn > _______________________________________________ Elecraft mailing list Post to: [hidden email] 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: [hidden email] 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: [hidden email] 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 |
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"Cop a Butchers at" - Sorry in English "Take a look at "
http://homepages.nildram.co.uk/~baker/K2_Overview.html 73 Stewart G3RXQ On Wed, 8 Nov 2006 11:26:03 -0500, Darwin, Keith wrote: > Since the NB occurs right before the existing Xtal filter, adding more > > filtering in the NB slot would increase the skirts of the filter, but it > wouldn't do a whole lot more. In other rigs with 2 filters, they are at > different IFs and have other stages between them. Having a 2nd filter > earlier in the signal chain helps to protect the RX from out of band > signals. > > The K2 already does that by having the only filter be as early as > possible. > > But, a cool option would be to have a narrow SSB filter that could go in > that slot. That way you could configure your SSB adapter to have a wide > Xtal filter for good sound and then add the narrow one for contests and > tough band conditions without having to resort to the variable CW filter > (which performs poorly at wide bandwidths). > > Of course, if you can live without your NB. I certainly can. > > - Keith N1AS - > > > -----Original Message----- > From: [hidden email] > [mailto:[hidden email]] On Behalf Of N2TK, Tony > Sent: Wednesday, November 08, 2006 10:32 AM > To: [hidden email]; [hidden email] > Subject: RE: [Elecraft] K2 Roofing Filter? > > Don, > Wasn't there talk a while back about someone replacing the Noise Blanker > with another crystal filter? If it was switchable, like switching in and > out the Noise Blanker, would that add to the shape of the skirts in the > present crystal filter? Not sure about making up for any loss in the > added filter though. Maybe set up this added filter for CW (400-600HZ) ? > > I still haul the K2 down to WP2Z. > 73, > N2TK, Tony > > -----Original Message----- > From: [hidden email] > [mailto:[hidden email]]On Behalf Of Don Wilhelm > Sent: Wednesday, November 08, 2006 10:15 AM > To: Joe-aa4nn; [hidden email] > Subject: RE: [Elecraft] K2 Roofing Filter? > > Joe, > > To generalize - 'roofing filter' would be placed right after the first > mixer for best effectiveness to strip off extraneous mixing products. > > The K2 is a single conversion design and the IF filter is placed right > after the first mixer (there is a post-mixer amp there for good dynamic > range) - so it serves both as the IF filter and the 'roofing filter'. > > In other words, yes a roofing filter 'does not compute' for a single > conversion design. > > 73, > Don W3FPR > >> -----Original Message----- >> >> In view of this, and excuse me for not being an engineer in receiver >> design, why is there not a roofing filter option for the K2. Is it >> just not possible in a single conversion rig? >> de Joe, aa4nn >> > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > 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: [hidden email] > 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: [hidden email] > 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: [hidden email] 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 |
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In reply to this post by K6TFZ
Probably no surprise, but I notice in the QRP Quarterly
17 out of 29 rigs listed in the Hootowl Sprint were Elecraft 12 out of 19 rigs listed in the milliWatt FD Results were Elecraft. 11 out of 15 rigs listed in the Homebrew Sprint were Elecraft de Joe, aa4nn _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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I operated W3GS for the milliwatt FD as listed in QQ. We actually had
two nearly identical QRP K2s, one for CW and one for SSB. Hardly seems fair using a K2 in a contest compared to other rigs. ;^) Mark, NK8Q K2 4786 Joe-aa4nn wrote: > Probably no surprise, but I notice in the QRP Quarterly > > 17 out of 29 rigs listed in the Hootowl Sprint were Elecraft > 12 out of 19 rigs listed in the milliWatt FD Results were Elecraft. > 11 out of 15 rigs listed in the Homebrew Sprint were Elecraft > > de Joe, aa4nn > > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > 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: [hidden email] 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 |
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