Installed K3EXREF
Locked
 
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Matt,
I agree that the biggest challenge is getting UHF and mw LO's to be on frequency. Due to the multiplication of the LO, any inaccuracy or instability is magnified. But it is just as important that the IF radio used with those transverters have good frequency characteristics as they are translated up to the operating frequency. Another little annoyance is operating on nets where stations are all over the place in frequency. As NC it is tough to keep tuning each offset out in a quick paced round table style net. I host a 2m-SSB net where a couple stations insist on being 100-Hz low (they maintain their radio dial says they are "on-freq"). With the K3EXREF and a PLL locked transverter I can be assured that my frequency is correct. Also, operating any mode that has a high duty cycle of key-down causes temperature related drift. K3EXREF will solve that. The K3EXREF is both accurate and stabile in freq. 73, Ed - KL7UW ------------------------------ Message: 37 Date: Sun, 20 Mar 2011 18:40:52 -0700 From: Matt Zilmer <[hidden email]> Subject: Re: [Elecraft] Installed K3EXREF To: "Jerry Muller" <[hidden email]> Cc: [hidden email] Message-ID: <[hidden email]> Content-Type: text/plain; charset=us-ascii Most of the applications where "extreme accuracy" is really needed are transverters at microwave freqs. That is a lot of the feedback received here. I believe that. It makes the most sense. A couple of PPM is plenty good for HF, imho. But there are those of us that have the frequency fetish. See the FMT for example. Dunno how many OO's have the capability to measure overall output to within a few Hz, nor how many can measure amplitudes to required levels of suppression. There must be some, and some are K3 owners. I got cited once, in 1973 by the FCC monitoring station in Kingsville, TX, when my dial marker was off by about 1 KHz. With the K3, nothing like that is a worry. But the K3EXREF makes it a certainty that you will have no excuse.... 73, matt W6NIA K3 #24 73, Ed - KL7UW, WD2XSH/45 ====================================== BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 144-1.4kw, 432-100w, 1296-testing*, 3400-winter? DUBUS Magazine USA Rep [hidden email] ====================================== ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Hello Edward,
Just a quick question. Would the existing K3 + TCXO3-1 + K144V be good enough for casual SSB operation in 2m? How would this combination be compared with modern V/U radio equipped with OCXO such as Icom IC9100 in terms of frequency stability in 2 m ? Can I understand that K3EXPEF is only required for GHz operation? Thanks for your advice in advance. cheers, Johnny VR2XMC ________________________________ 寄件人﹕ Edward R. Cole <[hidden email]> 收件人﹕ [hidden email] 傳送日期﹕ 2011/3/21 (一) 7:51:37 PM 主題： [Elecraft] Installed K3EXREF Matt, I agree that the biggest challenge is getting UHF and mw LO's to be on frequency. Due to the multiplication of the LO, any inaccuracy or instability is magnified. But it is just as important that the IF radio used with those transverters have good frequency characteristics as they are translated up to the operating frequency. Another little annoyance is operating on nets where stations are all over the place in frequency. As NC it is tough to keep tuning each offset out in a quick paced round table style net. I host a 2m-SSB net where a couple stations insist on being 100-Hz low (they maintain their radio dial says they are "on-freq"). With the K3EXREF and a PLL locked transverter I can be assured that my frequency is correct. Also, operating any mode that has a high duty cycle of key-down causes temperature related drift. K3EXREF will solve that. The K3EXREF is both accurate and stabile in freq. 73, Ed - KL7UW ------------------------------ Message: 37 Date: Sun, 20 Mar 2011 18:40:52 -0700 From: Matt Zilmer <[hidden email]> Subject: Re: [Elecraft] Installed K3EXREF To: "Jerry Muller" <[hidden email]> Cc: [hidden email] Message-ID: <[hidden email]> Content-Type: text/plain; charset=us-ascii Most of the applications where "extreme accuracy" is really needed are transverters at microwave freqs. That is a lot of the feedback received here. I believe that. It makes the most sense. A couple of PPM is plenty good for HF, imho. But there are those of us that have the frequency fetish. See the FMT for example. Dunno how many OO's have the capability to measure overall output to within a few Hz, nor how many can measure amplitudes to required levels of suppression. There must be some, and some are K3 owners. I got cited once, in 1973 by the FCC monitoring station in Kingsville, TX, when my dial marker was off by about 1 KHz. With the K3, nothing like that is a worry. But the K3EXREF makes it a certainty that you will have no excuse.... 73, matt W6NIA K3 #24 73, Ed - KL7UW, WD2XSH/45 ====================================== BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 144-1.4kw, 432-100w, 1296-testing*, 3400-winter? DUBUS Magazine USA Rep [hidden email] ====================================== ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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