K3 Filter IMD/BDR specs
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W4ZV sed:
[snip] Elecraft promised to post full IMD/BDR measurements for all filters but has not done so thus far. [2nd snip] I commend Elecraft for posting full data in advance but sure wish they would "get on with it" so I can finalize my order [end snip] I heartily agree!!!!!!!!!!!! What's the hangup with these measurements? "Time keeps on slippin, slippin, slippin...into the future" Steve Miller Band de Doug KR2Q _______________________________________________ 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 either want a K3 or I do not.
If I do (and I do), I feel if the rig is good, the filters are good. So, the exact measurements of anything in the radio are beside the point... I know I want the radio and I want filters for narrow SSB and general CW, so I add extra 1.8 and 500. DONE (Note: I did this without worrying about data). Now, if I am so worried about the exact data, then likely I should choose another brand of radio, or simply quiet down until my exacting soul can be satisfied LATER. 73, Charles Harpole [hidden email] Charles Harpole [hidden email] _________________________________________________________________ Discover sweet stuff waiting for you at the Messenger Cafe. Claim your treat today! http://www.cafemessenger.com/info/info_sweetstuff.html?ocid=TXT_TAGHM_SeptHMtagline2 _______________________________________________ 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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> If I do (and I do), I feel if the rig is good, the filters are good. That's the sad part - how does one get the "feeling" just by looking at a pretty picture, assembly manual with no schematics and a bunch of beta testers who are probably biased to the elecraft products anyway? My guess is that they (elecraft) will wait until enough orders are placed before they release the numbers :-PPP (it's a joke so relax, I am not seeking to be excommunicated from the Church of Elecraft :-) My personal decision is to start even considering the K3 and eventually place an order AFTER I see the schematics (when btw?), real performance numbers as result of 3rd party lab test and reviews from unbiased users. That's how I based my decision to order my K2/100 (I am happy with it btw). This on the other hand is not a K2. What also bothered me is that Elecraft promised the radio too early (probably because of Dayton) and now is chasing deadlines due to inpatient customers ("chasing deadlines' more often than not equals "cutting corners"). I've seen good and bad radios coming from one and the same company (Yaesu, Icom, Ten-Tec, you name it) so I wouldn’t jump and dump few thousands dollars into a black box, just because everyone says it is going to great. If you leave the guys (Wayne and Eric) alone to work I think it would be for the best. They have as much interest in delivering the radio as the ones who are waiting for it. My 2 cents. AE1Z _______________________________________________ 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 |
Re: K3 Filter IMD/BDR specs
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In reply to this post by DOUGLAS ZWIEBEL
Charles Harpole wrote:
> > So, the exact measurements of anything in the radio are beside the point... > I know I want the radio and I want filters for narrow SSB and general CW, so > I add extra 1.8 and 500. In that case you may have wasted your money as you haven't given one of the valid reasons for buying the optional filters. They are roofing filters, not primary selectivity filters. -- David Woolley Emails are not formal business letters, whatever businesses may want. RFC1855 says there should be an address here, but, in a world of spam, that is no longer good advice, as archive address hiding may not work. _______________________________________________ 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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On Sep 13, 2007, at 10:04 AM, David Woolley wrote: > Charles Harpole wrote: >> So, the exact measurements of anything in the radio are beside the >> point... I know I want the radio and I want filters for narrow SSB >> and general CW, so I add extra 1.8 and 500. > > In that case you may have wasted your money as you haven't given one > of the valid reasons for buying the optional filters. They are > roofing filters, not primary selectivity filters. They are both. You can make the DSP bandwidth narrower the selected crystal filter, but the crystal filter establishes the 1st IF bandwidth, which is critical to achieving high close-in dynamic range. We're working on the final numbers (which involves testing several radios with each filter to make sure they're consistent). Preview: they will be outstanding :) 73, Wayne N6KR --- 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 DOUGLAS ZWIEBEL
Here you go! These are recent measurements from our lab.
Filter 20kHz 10kHz 5kHz 2kHz 200 Hz, 5 pole 100+ 100+ 100+ 95 250 Hz, 8 pole 100+ 100+ 100+ 95 400 Hz, 8 pole 100+ 100+ 100+ 95 500 Hz, 5 pole 100+ 100+ 100+ 94 1 kHz, 8 pole 100+ 100+ 100 94 2.7 kHz, 5 pole 100+ 98 92 n/a 2.8 kHz, 8 pole 100+ 100 93 n/a These are typical numbers and may vary a couple of dB from radio to radio or filter to filter. 73, Eric WA6HHQ ==== _______________________________________________ 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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OMG! I died and went to heaven!!!!!!!!!!
Thanks a lot Eric....OUTSTANDING! de Doug KR2Q On 9/13/07, Eric Swartz - WA6HHQ, Elecraft <[hidden email]> wrote: > Here you go! These are recent measurements from our lab. > > Filter 20kHz 10kHz 5kHz 2kHz > 200 Hz, 5 pole 100+ 100+ 100+ 95 > 250 Hz, 8 pole 100+ 100+ 100+ 95 > 400 Hz, 8 pole 100+ 100+ 100+ 95 > 500 Hz, 5 pole 100+ 100+ 100+ 94 > 1 kHz, 8 pole 100+ 100+ 100 94 > 2.7 kHz, 5 pole 100+ 98 92 n/a > 2.8 kHz, 8 pole 100+ 100 93 n/a > > These are typical numbers and may vary a couple of dB from radio to > radio or filter to filter. > > 73, Eric WA6HHQ > ==== > > 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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On Thu, Sep 13, 2007 at 02:39:52PM -0400, DOUGLAS ZWIEBEL wrote:
> OMG! I died and went to heaven!!!!!!!!!! Now that we have that out of the way - I would offer that I am very happy thus far with the 400 hz CW filter. I have used it in 3 different contests and my almost daily 160 meter weak signal activity. I have lied to my DSP and told it that I am using a 500 Hz filter. The K3's father (Wayne) tells me this could be a bad thing - but I like the overall results. My next filter purchase? Probably the 6 KHz one - or perhaps 1 kHz. Tree N6TR [hidden email] _______________________________________________ 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 DOUGLAS ZWIEBEL
We're being conservative, too, hence the "+" signs in listings like the
one below. The average 5/10/20 kHz IMDDR3 from all the tests on narrow filters comes out to around 104 dB, and we've seen 2 kHz numbers as high as 98 dB. But Eric probably doesn't want me to mention that :) > 500 Hz, 5 pole 100+ 100+ 100+ 94 73, Wayne N6KR --- 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 Eric Swartz - WA6HHQ
I take it from the comments so far that these are pretty good. :) As
someone who knows more about PHP than IMD, could you give us the "for dummies" version? As someone whose main interests will be QRP PSK31 and CW, not serious contesting, which if any of these narrower filters would I benefit from? Also, there doesn't seem to be a lot to choose between the 2.7kHz 5 pole and the 2.8kHz 8 pole filter. I'm assuming that the former is the standard filter - what benefit would actually be observed using the latter? -- Julian, G4ILO K2 s/n: 392 K3 s/n: ??? G4ILO's Shack: www.g4ilo.com Ham-Directory: www.ham-directory.com On 9/13/07, Eric Swartz - WA6HHQ, Elecraft <[hidden email]> wrote: > Here you go! These are recent measurements from our lab. > > Filter 20kHz 10kHz 5kHz 2kHz > 200 Hz, 5 pole 100+ 100+ 100+ 95 > 250 Hz, 8 pole 100+ 100+ 100+ 95 > 400 Hz, 8 pole 100+ 100+ 100+ 95 > 500 Hz, 5 pole 100+ 100+ 100+ 94 > 1 kHz, 8 pole 100+ 100+ 100 94 > 2.7 kHz, 5 pole 100+ 98 92 n/a > 2.8 kHz, 8 pole 100+ 100 93 n/a > > These are typical numbers and may vary a couple of dB from radio to > radio or filter to filter. > 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
Julian, G4ILO. K2 #392 K3 #222 KX3 #110
* G4ILO's Shack - http://www.g4ilo.com * KComm - http://www.g4ilo.com/kcomm.html * KTune - http://www.g4ilo.com/ktune.html |
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In reply to this post by DOUGLAS ZWIEBEL
Then you had better send Elecraft your new address so that you get your K3;-)
Gary, N7HTS K2 #6113 On Thu, 13 Sep 2007 14:39:52 -0400 "DOUGLAS ZWIEBEL" <[hidden email]> wrote: > OMG! I died and went to heaven!!!!!!!!!! > > Thanks a lot Eric....OUTSTANDING! > > de Doug KR2Q > > On 9/13/07, Eric Swartz - WA6HHQ, Elecraft <[hidden email]> wrote: >> Here you go! These are recent measurements from our lab. >> >> Filter 20kHz 10kHz 5kHz 2kHz >> 200 Hz, 5 pole 100+ 100+ 100+ 95 >> 250 Hz, 8 pole 100+ 100+ 100+ 95 >> 400 Hz, 8 pole 100+ 100+ 100+ 95 >> 500 Hz, 5 pole 100+ 100+ 100+ 94 >> 1 kHz, 8 pole 100+ 100+ 100 94 >> 2.7 kHz, 5 pole 100+ 98 92 n/a >> 2.8 kHz, 8 pole 100+ 100 93 n/a >> >> These are typical numbers and may vary a couple of dB from radio to >> radio or filter to filter. >> >> 73, Eric WA6HHQ >> ==== >> >> > _______________________________________________ > 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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