Elecraft K144XV 2-m module design change
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Elecraft K144XV 2-m module design change
 
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Our prototype K144XV 2-m module for the K3 used a 6 meter IF (50-54
MHz). However, a number of K3 owners were concerned with this. In multi-transmitter installations, such as during high-band contesting, stations typically standardize on a 10-m IF to avoid interaction with high-power 6-m transmitters. Because of this, we've decided go with 10 m (28-30 MHz). The K144XV will still cover the full 144-148 MHz range by using two local oscillator frequencies (116 and 118 MHz). If you tune across the boundary at 146 MHz, the oscillator will switch automatically. The vast majority of weak signal work occurs below 146 MHz, and repeater in/out frequencies are normally either both below 146 or above it. So, local oscillator switching at 146 MHz should be a non- issue for most applications. You can set two 2-m transverter bands on the K3 if you like, one configured for CW/SSB work (144 MHz band edge) and the other for use with repeaters (146 MHz band edge). Or you can set up one band for the entire range, and the oscillator will switch as you tune across the boundary. If you have any questions regarding this change, please feel free to contact me directly. 73, Wayne N6KR ______________________________________________________________ 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 |
Re: Elecraft K144XV 2-m module design change
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I suppose the rest of us (non-high-power high band multi-station
contesters) shouldn't care. But it seems this is one of those things that benefits a very few users at the expense of adding a bit of operational clunkiness for the bulk of K3 users and to what was originally a pretty clean design idea with single band coverage. Heavy hitting contesters, do, after all, have other options such as high performance external transverters, etc., which they most likely already have on the table. Grant/NQ5T On Jul 22, 2009, at 5:31 PM, Wayne Burdick wrote: > Our prototype K144XV 2-m module for the K3 used a 6 meter IF (50-54 > MHz). However, a number of K3 owners were concerned with this. In > multi-transmitter installations, such as during high-band contesting, > stations typically standardize on a 10-m IF to avoid interaction with > high-power 6-m transmitters. > ______________________________________________________________ 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 |
Re： Elecraft K144XV 2-m module design change
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Hello Grant,
I do agree with you. For serious contesters, they could go for XV144. This also gives Elecraft a clear product distinction between XV144 and K144XV. Different product suit different market demand without too much product line overlap. 73 Johnny Siu VR2XMC ________________________________ 寄件人﹕ Grant Youngman <[hidden email]> 收件人 Elecraft Reflector <[hidden email]> 傳送日期﹕ 2009 年 7月 23 日 星期四 上午 10:40:10 主題： Re: [Elecraft] Elecraft K144XV 2-m module design change I suppose the rest of us (non-high-power high band multi-station contesters) shouldn't care. But it seems this is one of those things that benefits a very few users at the expense of adding a bit of operational clunkiness for the bulk of K3 users and to what was originally a pretty clean design idea with single band coverage. Heavy hitting contesters, do, after all, have other options such as high performance external transverters, etc., which they most likely already have on the table. Grant/NQ5T On Jul 22, 2009, at 5:31 PM, Wayne Burdick wrote: > Our prototype K144XV 2-m module for the K3 used a 6 meter IF (50-54 > MHz). However, a number of K3 owners were concerned with this. In > multi-transmitter installations, such as during high-band contesting, > stations typically standardize on a 10-m IF to avoid interaction with > high-power 6-m transmitters. > ______________________________________________________________ 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 Yahoo!香港提供網上安全攻略，教你如何防範黑客! 請前往 http://hk.promo.yahoo.com/security/ 了解更多! ______________________________________________________________ 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 |
Re: Elecraft K144XV 2-m module design change
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In reply to this post by wayne burdick
In a recent message, Wayne Burdick <[hidden email]> wrote ...
>The K144XV >will still cover the full 144-148 MHz range by using two local >oscillator frequencies (116 and 118 MHz). If you tune across the >boundary at 146 MHz, the oscillator will switch automatically. As the 2 metre band in most of the world is just 144 to 146 MHz, Wayne, this does seem to be an unnecessary complication for many of us. Does this facility increase the cost of the K144XV? If so, is there an alternative option for those of us with the 144-146 MHz band? Already having an XV144, I am trying to find a reason why I should order a K144XV for my K3. Can you help? What are the advantages? -- David G4DMP Leeds, England, UK ------ ______________________________________________________________ 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 |
Re: Elecraft K144XV 2-m module design change
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In reply to this post by wayne burdick
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In reply to this post by Grant Youngman
I believe that the "reuse" of ten meters can be transparent IF desired, and
the hi-lo range switching will not happen while going RX to TX for any common use I know about. K3 will show the 2 meter frequency when using the radio as an IF. The only change is what band in the K3 is used as an IF. And, the choice will belong to the owner. from Wayne's post: You can set two 2-m transverter bands on the K3 if you like, one configured for CW/SSB work (144 MHz band edge) and the other for use with repeaters (146 MHz band edge). Or you can set up one band for the entire range, and the oscillator will switch as you tune across the boundary. 73, Guy On Wed, Jul 22, 2009 at 10:40 PM, Grant Youngman <[hidden email]> wrote: > I suppose the rest of us (non-high-power high band multi-station > contesters) shouldn't care. > > But it seems this is one of those things that benefits a very few > users at the expense of adding a bit of operational clunkiness for the > bulk of K3 users and to what was originally a pretty clean design > idea with single band coverage. Heavy hitting contesters, do, after > all, have other options such as high performance external > transverters, etc., which they most likely already have on the table. > > Grant/NQ5T > 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 |
Re: Elecraft K144XV 2-m module design change
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That may be true, and it will probably be transparent as you
indicate. Other small interest groups (with apparently not as much pull) can't seem to get other promised and advertised features delivered that have no side effects at all, although I think all of us paid the same price for our radios :-) One apparently has to be a contester of some repute to get attention. Maybe I'll start a group that holds multi-station multi-operator high power 6M/VHF AM contests requiring the use of synchronous AM detection to score points :-) Grant/NQ5T On Jul 23, 2009, at 10:06 AM, Guy Olinger K2AV wrote: > I believe that the "reuse" of ten meters can be transparent IF > desired, and the hi-lo range switching will not happen while going > RX to TX for any common use I know about. > > K3 will show the 2 meter frequency when using the radio as an IF. > The only change is what band in the K3 is used as an IF. And, the > choice will belong to the owner. > ______________________________________________________________ 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 |
Re: Elecraft K144XV 2-m module design change
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In reply to this post by Thomas J. Hoedjes
Tom (HB9DOD) wrote:
> How does this work when either receive or transmit frequency is on > the other band in duplex > > For instance 146.3 recieve and 145.7 transmit... does the oscillator > also switch? Yes. But I don't know of any cases where normal repeater splits go across 146 MHz. And in any case you're limited to 144-146 MHz in HB- land, last time I checked :) Regarding another question posted here: The K144XV module has two advantages over our external 2-m transverter (the XV144). It's internal to the K3, and covers the full 144-148 MHz range. The XV144, being external, can be used with other rigs besides the K3, and has higher output power. 73, Wayne N6KR > > Thursday, July 23, 2009, 12:31:45 AM, you wrote: > > WB> Our prototype K144XV 2-m module for the K3 used a 6 meter IF > (50-54 > WB> MHz). However, a number of K3 owners were concerned with this. In > WB> multi-transmitter installations, such as during high-band > contesting, > WB> stations typically standardize on a 10-m IF to avoid interaction > with > WB> high-power 6-m transmitters. > > WB> Because of this, we've decided go with 10 m (28-30 MHz).... ______________________________________________________________ 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 |
Re: Elecraft K144XV 2-m module design change
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In reply to this post by wayne burdick
Wayne,
I dont see a problem with this change. Is the August delivery date still valid? How about the daughter board to use it as transverter IF? 73 Henk -- Henk Remijn PA5KT email: [hidden email] www: www.remijn.net ______________________________________________________________ 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 |
Re: Elecraft K144XV 2-m module design change
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Henk Remijn PA5KT wrote:
> I dont see a problem with this change. > Is the August delivery date still valid? We're still shooting for the end of August, although the design change and subsequent retesting may push this out a bit. > How about the daughter board to use it as transverter IF? That will be released sometime after first shipments of the basic K144XV. But it will be easy to install (no soldering). 73, Wayne N6KR ______________________________________________________________ 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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By using the 10m band those high power 10m users will have an issue - so I don't see how it solves anything besides moving the problem between users. 6m and 10m tend to also go together with 2m.
Perhaps it would be better to use a different band entirely - say 32-36MHz or 25-27 MHz and bypass the not really needed here band pass filters in the K3 using the KRX3. However, at least with a 10m IF it will be standard and equally as good or bad as the most common 28MHz IF choice. One needs to also think about the images and what is there. With 50MHz we have an LO of 94 MHz. This is not necessarily good as it is in the broadcast band so no LO breakthrough should happen to disturb the neighbours. We also have an image at 94 - 50 = 44 MHz. Not much there except my beacon! Now with 116MHz and 118MHz LO and 28 MHz IF we have an image at 88 MHz & 90MHz - Oh dear if you live near a FM broadcast station. Still, normal transverters manage it. Not forgetting that much of the world has a 70MHz band - I think a better choice could have been made permitting that band and/or 144MHz with a single LO at 120MHz and using the 24MHz and 50 MHz bands as IFs. Still I am no RF designer. Mike |
Re: Elecraft K144XV 2-m module design change
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In reply to this post by wayne burdick
Wayne,
I saw the K144XV at HamCom in Plano last month and it looked like the 2m antenna jack was mounted to the rear plate that is in place when the 100W PA is not installed. Where does the K144XV antenna jack go for those who have the KPA3? Paul WW2PT
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Re: Elecraft K144XV 2-m module design change
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In reply to this post by wayne burdick
On the same panel. The circuit breaker reset is a bit higher and the 2M BNC is
below the reset button. ------------------------- 73, Greg - AB7R Whidbey Island WA NA-065 On Thu Jul 23 14:08 , Paul - WW2PT sent: > >Wayne, > >I saw the K144XV at HamCom in Plano last month and it looked like the 2m >antenna jack was mounted to the rear plate that is in place when the 100W PA >is not installed. Where does the K144XV antenna jack go for those who have >the KPA3? > >Paul WW2PT > > > >wayne burdick wrote: >> >> >> We're still shooting for the end of August, although the design change >> and subsequent retesting may push this out a bit. >> >> > >-- >View this message in context: http://n2.nabble.com/Elecraft-K144XV-2-m-module- >Sent from the Elecraft mailing list archive at Nabble.com. >______________________________________________________________ >Elecraft mailing list >Home: http://mailman.qth.net/mailman/listinfo/elecraft >Help: http://mailman.qth.net/mmfaq.htm >Post: [hidden email]','','','')">[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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In reply to this post by wayne burdick
Hi Wayne,
> Because of this, we've decided go with 10 m (28-30 MHz). The K144XV to avoid potential interference with a 10m station work ing from the same location, wouldn't it make sense to use something like 30 to 34MHz as the IF? vy 73 de toby ______________________________________________________________ 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 |
Re: Elecraft K144XV 2-m module design change
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Morning all
I completely support the decision to run with a 28-30MHz IF. Contesting (round here anyway) is invariably divided into either HF or VHF. That is to say there is either an HF contest running, or a VHF contest running, but not both. This means that interference from a high power station on 10m to the 10m transverter IF is not an issue. We do have some contests where we would be running 2m and 6m alongside each other. The earlier concept of a 6m IF might have been problematic. Regards John G4ZTR -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Toby Deinhardt Sent: 26 July 2009 08:45 To: Wayne Burdick Cc: Elecraft Reflector Subject: Re: [Elecraft] Elecraft K144XV 2-m module design change Hi Wayne, > Because of this, we've decided go with 10 m (28-30 MHz). The K144XV to avoid potential interference with a 10m station work ing from the same location, wouldn't it make sense to use something like 30 to 34MHz as the IF? vy 73 de toby ______________________________________________________________ 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 __________ Information from ESET NOD32 Antivirus, version of virus signature database 4278 (20090725) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __________ Information from ESET NOD32 Antivirus, version of virus signature database 4278 (20090725) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com ______________________________________________________________ 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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